tag:blogger.com,1999:blog-69981123917801712362024-03-12T16:29:56.356-07:00GainphileGainphileUnknownnoreply@blogger.comBlogger60125tag:blogger.com,1999:blog-6998112391780171236.post-81418142668063077832015-01-26T00:00:00.000-08:002015-09-16T01:50:33.224-07:00<div dir="ltr" style="text-align: left;" trbidi="on">
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEi-KoJMpePHBiKthDm68wBxmQehEi78DWnPdd3MacIW0hlBL1vhdptOQ7DKVahVFv6lisjJNMl51WSju8HcFnbGT3an2GNrfXVL_zF-3fbyhdhfKRtR05h83EUiTT-fAOtWc7GazHf62OY/s1600/andi1.jpg" imageanchor="1" style="clear: right; float: right; margin-bottom: 1em; margin-left: 1em;"><br /></a></div>
<span style="font-size: 130%;"><b><span style="color: #330099;">Life-like reproduction of acoustic recording</span></b></span> is my primary goal. To achieve this goal my loudspeakers must engage the room neutrally, allowing room reflections to be delayed replicas of direct sound. This requirement demands a controlled radiation of sound waves both on and off-axis (Constant Directivity).<br />
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Nearly all commercial loudspeakers; typically woofer-midrange-dome tweeter in box arrangements (<a href="http://imgur.com/QQwMs">example</a>) are unable to meet this requirement. Hence I build my own.<br />
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEipoM4FInRJmnfd-c-DAgX119FD131wrMdLyWnuhVlGOxxwXyfB1U1-PdMrk70HMQ1FbJDnCDHrBr0k7U00wmI0bNjYrysEtSP6JoeJfHuZmcV0bRN5h0DvkqQcrr9gJ0M1tdJNclbHmVg/s1600/directivity-ideal.gif"><img alt="" border="0" id="BLOGGER_PHOTO_ID_5580189874769613666" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEipoM4FInRJmnfd-c-DAgX119FD131wrMdLyWnuhVlGOxxwXyfB1U1-PdMrk70HMQ1FbJDnCDHrBr0k7U00wmI0bNjYrysEtSP6JoeJfHuZmcV0bRN5h0DvkqQcrr9gJ0M1tdJNclbHmVg/s200/directivity-ideal.gif" style="cursor: pointer; display: block; height: 100px; margin: 0px auto 10px; text-align: center; width: 200px;" /></a><span style="font-style: italic;">An ideal polar response of a theoretical constant-directivity loudspeaker.<br />As you move to the sides of the loudspeaker, the sound level decreases uniformly<br />across the whole spectrum from 20-20khz. This is not achievable in practice (yet).</span><br />
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhWxCTybMlY7GtUJXNNRl4Gz86M7uEmQjOBIPy31UiudEUmrvVCljUVbIV3WlfKnChmvI4XDY9HFRyGI3wlFNqxgZlRnYHumdcTzRDY88UlU1ezKEMnOLnfhA3hyobs73i_sqTvGueG7PY/s1600/s15dsp+normalised.png"><img alt="" border="0" id="BLOGGER_PHOTO_ID_5580189964595932482" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhWxCTybMlY7GtUJXNNRl4Gz86M7uEmQjOBIPy31UiudEUmrvVCljUVbIV3WlfKnChmvI4XDY9HFRyGI3wlFNqxgZlRnYHumdcTzRDY88UlU1ezKEMnOLnfhA3hyobs73i_sqTvGueG7PY/s200/s15dsp+normalised.png" style="cursor: pointer; display: block; height: 100px; margin: 0px auto 10px; text-align: center; width: 200px;" /></a><span style="font-style: italic;">S15 Econowave DSP, a variant of popular box and waveguide/horn topology<br />like the Econowaves, JBLs, Gedlee or PiSpeakers. Excellent directivity down to 1khz (2</span><span class="st">π)</span><span style="font-style: italic;">, which gradually transition to omni-directional (4</span><span class="st">π)</span><span style="font-style: italic;"> at lower frequencies.</span><br />
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjobekbOP7AkPdPX8eDG951Bpd7BktTlo76AUiKm_Uld2Rl6dyUOnNlQO2p3lPbrnyvUMrJ4FV2umUJiXf_NkDBk2trfGU3b7jqwF-0l_NN3WW_UJvZwv-D8U5cTBhGnOWyO1t2_qNKkrw/s1600/rB4mH.png"><img alt="" border="0" id="BLOGGER_PHOTO_ID_5577573853506892178" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjobekbOP7AkPdPX8eDG951Bpd7BktTlo76AUiKm_Uld2Rl6dyUOnNlQO2p3lPbrnyvUMrJ4FV2umUJiXf_NkDBk2trfGU3b7jqwF-0l_NN3WW_UJvZwv-D8U5cTBhGnOWyO1t2_qNKkrw/s200/rB4mH.png" style="cursor: pointer; display: block; height: 100px; margin: 0px auto 10px; text-align: center; width: 200px;" /></a><span style="font-style: italic;">A normalised sonogram plot of S16 & <a href="http://gainphile.blogspot.com.au/2015/01/r16-constant-directivity-loudspeakers.html">R16</a> Constant Directivity Dipole Loudspeakers.<br />90</span><span style="color: #666666;">°</span> <span style="font-style: italic;">waveguide dispersion gradually transition to 120</span><span style="color: #666666;">°</span><span style="font-style: italic;"> dipole down to 20hz!<br />This is the closest to ideal.</span><br />
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With the advent of computer-based realtime analyzers, it is possible for amateurs to build such loudspeakers at relatively modest cost. All of these projects were built using active analog or DSP crossovers and multi-channel amplifications.<br />
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<i>Andi W.</i></div>
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<i>Melbourne, Australia</i><br />
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<span style="font-size: large;"><a href="http://gainphile.blogspot.com.au/2015/01/r16-constant-directivity-loudspeakers.html">R16 Constant Directivity Loudspeakers</a></span></h3>
<a href="http://2.bp.blogspot.com/-yyS3n67_a9Y/VMYaxAwDe9I/AAAAAAAAUXA/goBgqOGPfWk/s1600/DSC_1201.jpg" imageanchor="1" style="clear: right; float: right; margin-bottom: 1em; margin-left: 1em;"><img border="0" height="200" src="http://2.bp.blogspot.com/-yyS3n67_a9Y/VMYaxAwDe9I/AAAAAAAAUXA/goBgqOGPfWk/s1600/DSC_1201.jpg" width="132" /></a>Based on <a href="http://gainphile.blogspot.com.au/2010/12/s16-constant-directivity-dipoles.html">S16</a> prototype these loudspeakers were commissioned and shipped to participate in a US audio research project (<a href="http://www.princeton.edu/3D3A/">Princeton University 3D3A</a>)<br />
<a href="http://gainphile.blogspot.com.au/2015/01/r16-constant-directivity-loudspeakers.html">more ...</a><br />
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhq58jTGplZ_AAzhxI3GzPN9THbGgs-6Rsi0YuXnsV0jiG1Qps2Tc3WMIsduLxnQgsTwa3Su_8ddJeiyixu_Vpz3hnfCgqQXCduM2wNLLR-TN55E1KSc5G1tzE2Ox7JyDeAYMK4spYn1Rc/s1600/S23+Active+Cardioid.png" imageanchor="1" style="clear: right; float: right; margin-bottom: 1em; margin-left: 1em;"><img border="0" height="173" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhq58jTGplZ_AAzhxI3GzPN9THbGgs-6Rsi0YuXnsV0jiG1Qps2Tc3WMIsduLxnQgsTwa3Su_8ddJeiyixu_Vpz3hnfCgqQXCduM2wNLLR-TN55E1KSc5G1tzE2Ox7JyDeAYMK4spYn1Rc/s1600/S23+Active+Cardioid.png" width="200" /></a></div>
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<a href="http://gainphile.blogspot.com/2014/07/s23-active-cardioid-loudspeakers.html"><span style="font-size: large;">S23 Active Cardioid Loudspeakers</span></a></h3>
Cardioid loudspeakers have desirable traits when place in a room. However they are normally difficult to design and build. Using S19 platform two alternating channels are converted to monopoles, which provides the acoustic sum as Cardioid.<br />
<a href="http://gainphile.blogspot.com/2014/07/s23-active-cardioid-loudspeakers.html">more ...</a><br />
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEg3rJXvGKjPBO_cNuUs7oIUfHDy46sdmkIG6nTqwFgVmYawMd4pOoXYNawh8NdNgqFJRa6t2tmDUrF1QlumicHf8W3XSJ6LdewCP5F7JV_rW74_Lh6ookUIQdSly6xNgMC8AeFnRbFCpy8/s1600/Zaph+Dipole.png" imageanchor="1" style="clear: right; float: right; margin-bottom: 1em; margin-left: 1em;"><img border="0" height="200" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEg3rJXvGKjPBO_cNuUs7oIUfHDy46sdmkIG6nTqwFgVmYawMd4pOoXYNawh8NdNgqFJRa6t2tmDUrF1QlumicHf8W3XSJ6LdewCP5F7JV_rW74_Lh6ookUIQdSly6xNgMC8AeFnRbFCpy8/s200/Zaph+Dipole.png" width="168" /></a></div>
<b><span style="font-size: large;"><a href="http://gainphile.blogspot.com.au/2012/06/s20-z-compact-open-baffle-using-zaph.html">S20-Z Compact Open Baffle</a></span></b><br />
<span style="background-color: white;">This is a design for ultra-c</span><span style="background-color: white;">ompact and economical Open Baffle design, similar dimensions to a typical 5" hifi floorstander.</span><br />
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While open baffle loudspeakers provide the outmost transparency and openness due to absence of box, they are normally very large and expensive to build. Zaph had done the hard work of providing an excellent 2-way loudspeaker kit, and we simply take this kit as a basis for this design.<br />
<a href="http://gainphile.blogspot.com.au/2012/06/s20-z-compact-open-baffle-using-zaph.html">more ...</a><br />
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<b><span style="font-size: large;"><a href="http://gainphile.blogspot.com.au/2012/03/s19-4-way-dipole-radiator.html">S19 4-Way Dipole Radiator</a></span></b><br />
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<a href="http://2.bp.blogspot.com/-Wl5FSxXXX-s/UEIXFnPpH2I/AAAAAAAAIU4/KGLJTJBSU58/s1600/DSC_2595.jpg" imageanchor="1" style="clear: right; float: right; margin-bottom: 1em; margin-left: 1em;"><img border="0" height="161" src="http://2.bp.blogspot.com/-Wl5FSxXXX-s/UEIXFnPpH2I/AAAAAAAAIU4/KGLJTJBSU58/s200/DSC_2595.jpg" width="200" /></a></div>
Coverage of frequency range from 20 to 20khz is improved by using a small midrange driver from 400hz to 2khz. The tradeoff with 4-way dipoles are complexity and more difficult design process to take account of polar response changes.<br />
<a href="http://gainphile.blogspot.com/2012/03/s19-4-way-dipole-radiator.html">more ...</a><br />
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<a href="http://www.blogger.com/goog_653659306"><span style="font-size: 130%;"></span></a><span style="font-size: 130%;"><a href="http://www.blogger.com/blogger.g?blogID=6998112391780171236" style="font-weight: bold;">S16 - Constant Directivity OB</a></span><br />
<a href="http://gainphile.blogspot.com.au/2010/12/s16-constant-directivity-dipoles.html" style="clear: right; float: right; margin-bottom: 1em; margin-left: 1em;"><img border="0" height="132" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEi-KoJMpePHBiKthDm68wBxmQehEi78DWnPdd3MacIW0hlBL1vhdptOQ7DKVahVFv6lisjJNMl51WSju8HcFnbGT3an2GNrfXVL_zF-3fbyhdhfKRtR05h83EUiTT-fAOtWc7GazHf62OY/s200/andi1.jpg" width="200" /></a><br />
An attempt to improve high-frequency directivity of Dipole loudspeakers. Based on S12, various combinations of tweeters, compression drivers, and waveguides were investigated.<br />
<a href="http://gainphile.blogspot.com/2010/12/s16-constant-directivity-dipoles.html">more ...</a><br />
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<span style="font-size: 130%; font-weight: bold;"><a href="http://gainphile.blogspot.com/2010/11/s15-econowave-dsp.html">S15 Econowave DSP:<br />A Constant Directivity Loudspeaker</a></span><a href="http://gainphile.blogspot.com/2010/11/s15-econowave-dsp.html"><img alt="" border="0" id="BLOGGER_PHOTO_ID_5601015086825481394" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEikKDtR1zhfkp8RE6A_xYmW9sfqJuV-8j6W617imwi2y9-mcVwfyemBPlFpd5Sudp0eaO5CN1ye_bw56DX7U5mApB8ykxakW2b_iYbTY_HANSnB7oA-_TEBvI6ahw2oTiem3IE5ePdRx9U/s200/Clipboard01.jpg" style="float: right; height: 133px; margin: 0pt 0pt 10px 10px; width: 200px;" /></a><br />
Econowave is a cost effective <i>controlled</i><span style="font-style: italic;">-directivity</span> loudspeaker design. DIY Folks at <a href="http://audiokarma.org/forums/showthread.php?p=1856214#post1856214">AudioKarma</a> had investigated numerous driver + waveguide combination which would achieve this goal successfully,<br />
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This is a fully-documented build with variations of drivers used. You can also purchase the DSP configuration file to speed up listening to your music!<br />
<a href="http://gainphile.blogspot.com/2010/11/s15-econowave-dsp.html">more ...</a><br />
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<span class="Apple-style-span" style="color: red;"><b><br /></b></span><a href="http://gainphile.blogspot.com/2009/11/s12-ob-open-baffle-simplicity.html"><b><span style="font-size: 130%;">S12 OB - Open baffle simplicity</span></b></a><b><span style="font-size: 130%;"> </span></b><a href="http://gainphile.blogspot.com/2009/11/s12-ob-open-baffle-simplicity.html"><b><span style="font-size: 130%;"><img alt="" border="0" id="BLOGGER_PHOTO_ID_5408232393850864898" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgj0X7UhnlKzg0X4Qq8e3AMLd8bRIgtvjbATivv9oU9EcN0NkAEe64mqn0pg2aHfz39a5IkaPjDE3-6GkxSLGmk3IVJ1pMU8kGzKvLCnhT0vki-aP7IxPgjNBSlTODv_6ZgJ5va1Hkshvc/s200/dsc_0987.jpg" style="float: right; height: 133px; margin: 0px 0px 10px 10px; width: 200px;" /></span></b></a><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgj0X7UhnlKzg0X4Qq8e3AMLd8bRIgtvjbATivv9oU9EcN0NkAEe64mqn0pg2aHfz39a5IkaPjDE3-6GkxSLGmk3IVJ1pMU8kGzKvLCnhT0vki-aP7IxPgjNBSlTODv_6ZgJ5va1Hkshvc/s1600/dsc_0987.jpg"></a><br />
A true open baffle with its simplicity (no h/w/u -frame etc.) I have observed that there is something about them which other variations simply can't match due to very uniform polar response. <a href="http://gainphile.blogspot.com/2009/11/dipole-bass-array.html"></a><br />
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They project very transparent, holographic soundstage.<br />
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A Dipole Bass Array below could be used to increase the absolute bass SPL of these loudspeakers using 8 additional woofers, effectively making them 4-way system.<br />
<a href="http://gainphile.blogspot.com/2009/11/s12-ob-open-baffle-simplicity.html">more...</a><br />
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<a href="http://gainphile.blogspot.com/2009/08/s9-open-baffle-speakers.html"><br /></a><a href="http://gainphile.blogspot.com/2009/08/s9-open-baffle-speakers.html"><b><span style="font-size: 130%;">S9 Open Baffle Speakers</span></b></a><a href="http://gainphile.blogspot.com/2009/08/s9-open-baffle-speakers.html"><img alt="" border="0" id="BLOGGER_PHOTO_ID_5395662253966362306" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiMpcwCNfM_xWhkHkaEzH6O8CwQVX3qi4QlxRugylwRAx8KddW1r5RjktfEEB4RUF1_AIM4OEy2ow-t8twXYTaogFLlia-8TEoe3GRznYvGYzrvZ7KtzhWtx5m-pCrIbLpLSh8FlAUbNXU/s200/DSC_9877b.jpg" style="float: right; height: 133px; margin: 0px 0px 10px 10px; width: 200px;" /></a><br />
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These were built to revisit the <a href="http://gainphile.blogspot.com/2009/01/s7-open-baffle-loudspeakers.html" rel="nofollow" target="_blank">previous design</a> which measured and sounded most natural and smooth. So much that the <a href="http://www.diyaudio.com/forums/showthread.php?s=&threadid=140486" rel="nofollow" target="_blank">further effort</a> to obtain dipole bass quantity had to be scrapped.<br />
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The wide, pistonic dispersion of small 5" drivers combined with narrow baffle allows very smooth and uniform polar response to 2.5kHz, which is almost one octave above the high xo frequency. The loudspeakers are actively driven using 6 separate amplifier channels and allows potential addition of woofers for more low-frequency output.<br />
<a href="http://gainphile.blogspot.com/2009/08/s9-open-baffle-speakers.html">more...</a><br />
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<span style="font-size: 130%;"><a href="http://gainphile.blogspot.com/2009/09/s11-ob-bookshelf-open-baffle-with-seas.html" style="font-weight: bold;">S11 Desktop Open Baffle<img alt="" border="0" id="BLOGGER_PHOTO_ID_5395661520138406706" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjY2G0Umyzo4-8Ps0IlkYYPmL5HSytl5gKh8T9NOrmnhITAG1J1UqAeUdSBWVXnUY2hYZOQie9xuYzCvp8rLnT4KNLhUas5pUcV3SQQCJ5OpilNLH4vKlUFKpSq_ZN73GfetD2UAY637D8/s200/DSC_0236.jpg" style="float: right; height: 133px; margin: 0px 0px 10px 10px; width: 200px;" /></a></span><br />
These are open baffle speakers for the desktop. They are 2-way system with active crossover and eq circuitry. The woofers are Seas L21 and the tweeters are TangBand W3-1364. They are designed to produce 40Hz dipole bass.<br />
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The distance to rear wall is about 35cm. I could not hear any faults despite general requirements for dipole speakers to be away from walls. This could be due to the nearfield listening location and that the relative distance is more important than the absolute one. Comparing to my living room dipoles (which is 1m from rear wall), maybe a bit less soundstage, but that's really nitpicking. Phantom image is very scary, almost like the speakers making no sound and the music comes out of the wall. Listening to some classical recording I got goosebumps. If there is one best thing that stands out from them, it's the midrange.<br />
<a href="http://gainphile.blogspot.com/2009/09/s11-ob-bookshelf-open-baffle-with-seas.html">more...</a><br />
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<b>Concepts and Work in Progress:</b><br />
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<span style="clear: right; float: right; margin-bottom: 1em; margin-left: 1em;"><img border="0" height="132" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiMl4bPwf_nWwwxlwqqJouwjy2LKgFS-x_SxuD42NNZb00JlkNiJIQqvOD93dLWS5hsQ2BGqwVBM4aW2VLBq-FD8iV4JyhIdADddoU-d2YIKFljuzNuKT4rKtzhmEAefguEkYbY8veBRsU/s200/DSC_1311s.jpg" width="200" /></span><span style="font-size: large;"><b><a href="http://gainphile.blogspot.com.au/2012/05/audio-technica-ath-ad700-correction-eq.html">Audio-Technica ATH-AD700 Equalizer</a></b></span><br />
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These are $150 "Open-Air" headphones which have strong popularity among head-fi enthusiasts. Among the general consensus are high-resolution, airy sound. I heard them first when JP Howard brought them to my house and was immediately impressed.<br />
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Upon hearing the headphones for the first time, I noticed they sound too bright for my liking. Hence I measured and investigated an optimum correction equalizer<br />
<a href="http://gainphile.blogspot.com.au/2012/05/audio-technica-ath-ad700-correction-eq.html">more ...</a><br />
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<span style="font-size: 130%;"><a href="http://gainphile.blogspot.com/2011/04/s18-dsp-3-way-econowave.html" style="font-weight: bold;">S18 - DSP 3-way Econowave</a></span><br />
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<span style="font-size: 130%;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgW7B8DE6T0p4uv094KNaURU4eBzElHATuNF8ohlpBbgz_lKh1Y0emAqIBhN5DwYzXpizVx5o-Npq1iC-qJFTluzao8XZuoocn1FAAFbVoUUbf_FJddXeYOoi6q_jnyHftt4prCV49lfAs/s1600/S18.png" imageanchor="1" style="clear: right; float: right; margin-bottom: 1em; margin-left: 1em;"><img border="0" height="200" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgW7B8DE6T0p4uv094KNaURU4eBzElHATuNF8ohlpBbgz_lKh1Y0emAqIBhN5DwYzXpizVx5o-Npq1iC-qJFTluzao8XZuoocn1FAAFbVoUUbf_FJddXeYOoi6q_jnyHftt4prCV49lfAs/s200/S18.png" width="166" /></a></span></div>
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An attempt for smaller form-factor constant directivity design. It will be high-sensitivity speakers with 8" woofers and dual 12" subs.<br />
<a href="http://gainphile.blogspot.com/2011/04/s18-dsp-3-way-econowave.html">more ...</a><br />
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<a href="http://gainphile.blogspot.com/2009/11/dipole-bass-array.html"><span style="font-size: 130%;"><b>Dipole Bass Array</b></span> </a><br />
<a href="http://gainphile.blogspot.com/2009/11/dipole-bass-array.html"><span style="font-size: 130%;"><img alt="" border="0" id="BLOGGER_PHOTO_ID_5406051332959792402" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjNDKQuIs032kHE60G8A3XuJA_Rr1JgU32JKWTef8xZbfdeB1J9huXQ0Z3R1bh4wjNm2brDD-OGCYM83KJrzokSiYRg0T87m2cCAtQjnD0zTDUKXPfVXlA7DhId6muy_xyaUbkxJtK3WaM/s200/Dipole+Bass+Array.jpg" style="float: right; height: 200px; margin: 0px 0px 10px 10px; width: 92px;" /></span></a>An investigation to double the number of woofers in a dipole system, which would provide additional 6dB of maximum output.<br />
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<b>Other successful projects:</b><br />
<b> </b><a href="http://gainphile.blogspot.com/2008/05/linkwitz-pluto-sewer-pipe-omni-p.html"><img alt="" border="0" id="BLOGGER_PHOTO_ID_5588287109011001890" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiI0RnOwLNFakU9ncmyof0hhK4EyJZs2n2yyXYlsFcfN9RtWZyTggZ73aEjNZhoUD3vS-pJ08Z3UknBrzRNCrYf9TepxgPlWF9_O6ufqyaVqXyAKHTFcwUAydQUfyjzprwrjnj29I1s1Cs/s200/dsc_5925.jpg" style="float: right; height: 133px; margin: 0pt 0pt 10px 10px; width: 200px;" /></a><br />
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<b></b><a href="http://gainphile.blogspot.com/2008/05/linkwitz-pluto-sewer-pipe-omni-p.html"><span style="font-size: 130%;"><b>LinkwitzLab Pluto Clone</b></span></a><span style="font-size: 130%;"><b> </b></span><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjMxOpwj0sTYhlsY6COzNnjYPquMo1FT6yZ3xkO3YgtBEXIVrShmlbezXCmqubNx79xiKBNnd3vOANy5PZ1nioxkIWcw_6pTdQns6XCDO3MFo9dE0xVNfOkskBFriqVIaKxiAebHIcYoJU/s1600-h/dsc_0342.jpg"><span style="font-size: 130%;"><b></b></span></a><br />
A genius Omni-Directional speaker design <a href="http://linkwitzlab.com/Pluto/Pluto-2.1.htm">by Sigfried Linkwitz</a>. They sound as open as dipole speakers with some superiority in the imaging area. However my clone lacks the transparency and clean sound of the open baffle.<br />
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<a href="http://gainphile.blogspot.com/2008/11/cheap-and-accurate-speaker-measurement.html"><span style="font-size: 130%;"><b>Cheap and accurate loudspeaker measurement tool</b></span></a><span style="font-size: 130%;"> <a href="http://gainphile.blogspot.com/2008/11/cheap-and-accurate-speaker-measurement.html"><img alt="" border="0" id="BLOGGER_PHOTO_ID_5395662916388414562" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgGw8x0Ov1kWjLH4BJraktXs52G0WGHZFIVg08IdCI95WCcesTRvHbOi8X6EXYGeB6zFPlLbwfSCRyovcJBHbE45IqUjWJ0_CcGLrPTQs-_Dn5CJkJL9jUVRpazkG-S0tGoND9FyJSiyYw/s200/DSC_6730.jpg" style="float: right; height: 133px; margin: 0px 0px 10px 10px; width: 200px;" /></a> </span><br />
Never embark in loudspeaker projects without adequate measurement tool. The ears are not to be trusted. The good news is a set of measurement tool can be build for under $70, including the soundcard!<br />
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<a href="http://gainphile.blogspot.com/2008/12/audiophile-media-center.html"><span style="font-size: 130%;"><b>DIY Linux-based Audiophile media centre</b></span></a><span style="font-size: 130%;"><b> </b></span><a href="http://gainphile.blogspot.com/2008/12/audiophile-media-center.html"><span style="font-size: 130%;"><b><img alt="" border="0" id="BLOGGER_PHOTO_ID_5395662920404069954" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEie4LovB2YynCGeBsYH5xDjDnnHrNvIwc6Ygkaj2IXRkScA_1I1m816Hi2axCBpKd8ndi4vsm0fw4qyuUhSLnTWQ9tquGjSnEeV8q2HPLdFSfnm8558VvjFeQ65wrrUX45e8jthazLB9zI/s200/mms.jpg" style="float: right; height: 140px; margin: 0px 0px 10px 10px; width: 200px;" /></b></span></a><span style="font-size: 130%;"><br /></span>My high-resolution music collection has been growing, mostly sourced from Vinyl/LP rips. They are superior than normal CDs which are recorded at 16/44.1kHz.<br />
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Off-the-shelf audiophile media center or server are very expensive (read: Linn DS is $15,000!). Comparable solution could be built for under $400, including the sound card and Laptop.<br />
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<span style="font-weight: bold;">Other/Past projects:</span><br />
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<span style="font-size: 130%;"><a href="http://gainphile.blogspot.com/2011/02/s17-constant-directivity-dipoles.html">S17 - Constant Directivity Dipoles </a></span><a href="http://gainphile.blogspot.com/2011/02/s17-constant-directivity-dipoles.html"><img alt="" border="0" id="BLOGGER_PHOTO_ID_5576783620418534594" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiVR5Y3uTjrXmAz4i6Kp20NEGt1kDyXXSQVVqbAsiMVAO_Q6o6StvhY4CqG6Efw0T9pDpg4nwv0IZ03tsEi4DoWl49jfq79fUx1G7yz1xSzXcuI8yMvA2JdsDYJ5oA1c-ZHf9kIUXyu_gY/s200/dsc_5338.jpg" style="float: right; height: 133px; margin: 0pt 0pt 10px 10px; width: 200px;" /></a><br />
In this iteration I want real dipole radiation front and back, and uniform to very high frequencies. This can only be done with extemely short front-to-back distance.<br />
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The "tweeters" used are TangBand 3" full-range. They allow three things to happen:<br />
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- Dipole peak to occur very high in the frequency range, allowing constant directivity<br />
- Very open rear chamber for good rear frequency response<br />
- Low crossover frequency<br />
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<a href="http://gainphile.blogspot.com/2011/02/s17-constant-directivity-dipoles.html">more...</a><br />
<span style="color: red;"><b><br /></b></span><a href="http://gainphile.blogspot.com/2010/02/s13-ob-fullrange-dipole-tweeters.html">S13 OB</a> <a href="http://gainphile.blogspot.com/2010/02/s13-ob-fullrange-dipole-tweeters.html"><img alt="" border="0" id="BLOGGER_PHOTO_ID_5445075607369492386" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiSco4x_jfV3hJOgth_z2B4HaUhsYnRVItBnK12-hHZbsFjuDaiJM_l2IVJiO_UHXLismm9JzDvxPmJCB2_LpVAOc6hZwWJG4keK5rQ0bqOCFDNqXqHfR2aFGoGwrZQ5qWYfI-KLwNm8Mk/s200/dsc_1257b.jpg" style="float: right; height: 113px; margin: 0px 0px 10px 10px; width: 200px;" /></a><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhDeQ1zj0N-0nlZgAjQPdnFCnbWgKFNVED98zcNhPhUQ-47DdjFire6RghQRRxG2UOj0WTOx4jtouPfuerpc38ppxAVOJLhZZa9zz-GccIa3B-kNX50kIxIZDYM-7uFzDDFOigcoHJ2SXU/s1600-h/dsc_1255.jpg"></a><br />
This was an unsuccessful attempt to use fullrange drivers as dipole tweeters. Constant directivity was achieved up to excellent 10khz, yet the system did not sound coherent.<br />
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<a href="http://gainphile.blogspot.com/2009/09/s10-ob-seas-l21rnxp-on-open-baffle.html">S10 OB - Seas L21RNXP</a>When I saw someone was selling a pair of Seas L21RNXP really cheap on ebay I couldn't resist having a go at rigid piston driver. The most interesting finding was that S9 and S10 sounds similar, albeit the difference in xo point, baffle width, and cone/driver material. I was therefore convinced sthat if the design goals are met (frequency response, polar response, etc.) then speakers would sound similar. I prefer the S9 above for cost and aesthetics as they are smaller.<br />
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<a href="http://gainphile.blogspot.com/2009/03/s8-open-baffle-speakers.html">S8 OB</a><a href="http://gainphile.blogspot.com/2009/03/s8-open-baffle-speakers.html"><span style="font-size: 180%;"><b><img alt="" border="0" id="BLOGGER_PHOTO_ID_5395662248112579618" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjm5X3G7s16tQWUggtRvCq4t3m33UyNwnOVpH2exxVY4ovgT5PyO4CdQ4gTApBpX-e1XYinwXtSPx8BHPdbqZYNp9v4trHM2XSQa2JFttOZOWIN6ttczlm_f6d0XduAznISiWG8LpnwCgs/s200/DSC_9122.jpg" style="float: right; height: 102px; margin: 0px 0px 10px 10px; width: 200px;" /></b></span></a><a href="http://gainphile.blogspot.com/2009/03/s8-open-baffle-speakers.html"><br /></a>Dipole speakers with 6x 10" woofers as their main strength. It gives great bass, but unfortunately the 5" P13WH midrange is acoustically to small for the 30cm baffle, and hence do not sound smooth. I have since went back to slim baffle as the S9. These speakers were presented at local Australian hifi hobbyist meeting (<a href="http://www.stereo.net.au/forums/showthread.php/14553-Coming-soon-an-openly-baffling-GTG-in-Melbourne?highlight=baffling">SNA</a>).<br />
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<a href="http://gainphile.blogspot.com/2009/01/s7-open-baffle-loudspeakers.html">S7 Open Baffle</a><br />
Discovery of narrow baffles and their excellent polar response<br />
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<a href="http://gainphile.blogspot.com/2008/12/s6-open-baffle-loudspeakers.html">S6 Open Baffle</a><br />
Experiments with large 15" Eminence Alpha woofers. I have since learnt that better result would be obtained by smaller drivers.<br />
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<a href="http://gainphile.blogspot.com/2008/12/s4-open-baffle-loudspeaker.html">S4 OB</a><br />
Pushing 15" woofer in a 2-way dipole configuration. Many problems were encountered here.<br />
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<a href="http://gainphile.blogspot.com/2008/05/stealth-ob.html">Stealth</a>, <a href="http://gainphile.blogspot.com/2008/06/stealth-2-ob-speakers.html">Stealth 2</a>, and <a href="http://gainphile.blogspot.com/2008/08/stealth-3.html">Stealth3</a>Various attempts for a low-frequency extension desktop Open Baffle speakers. They were huge and not aesthetically pleasing.<br />
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<a href="http://gainphile.blogspot.com/2007/12/dipole-open-baffle-speakers.html">First open baffle system</a><br />
The genesis of my dipole speaker designs. It was passive and utilised wide baffles. Even with all the inperfection I felt this was the right direction. There is a youtube clip of them <a href="http://youtube.com/watch?v=StnJpUfQcZc">here</a>.<br />
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<a href="http://gainphile.blogspot.com/2009/01/past-projects.html">Loudspeaker journey</a><br />
Various undocumented speakers built in the past for fun, amusements, and curiosity<br />
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<a href="http://gainphile.blogspot.com/2008/12/audiophile-media-center.html">Linux-Based Media Centre</a> using Ubuntu, MMS, and SoundBlaster Live! 24bit<br />
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<a href="http://gainphile.blogspot.com/2008/07/physics-cs2-clone.html">Emerald Physics S2 Clone</a><br />
Failed project to clone Emerald Physics' CS2, a refresingly new take on commercial loudspeaker design.<br />
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<a href="http://gainphile.blogspot.com/2007/10/gainclone-casing-and-final-touches.html">4-Channel Gainclone</a><br />
My amplifier to driver the active dipole loudspeakers </div>
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Unknownnoreply@blogger.com3tag:blogger.com,1999:blog-6998112391780171236.post-73682501317166695922015-01-25T02:52:00.000-08:002016-01-19T21:52:37.366-08:00R16 - Constant Directivity Loudspeakers<div dir="ltr" style="text-align: left;" trbidi="on">
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<a href="http://2.bp.blogspot.com/-yyS3n67_a9Y/VMYaxAwDe9I/AAAAAAAAUXA/goBgqOGPfWk/s1600/DSC_1201.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="640" src="http://2.bp.blogspot.com/-yyS3n67_a9Y/VMYaxAwDe9I/AAAAAAAAUXA/goBgqOGPfWk/s1600/DSC_1201.jpg" width="424" /></a></div>
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Based on <a href="http://gainphile.blogspot.com.au/2010/12/s16-constant-directivity-dipoles.html">S16</a> prototype these loudspeakers were commissioned to participate in a US audio research project, the <a href="http://www.princeton.edu/3D3A/index.html">Princeton University 3D3A</a> (3D Audio and Applied Acoustics).<br />
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See 3D3A measurements of R16 <a href="http://www.princeton.edu/3D3A/Directivity/Gainphile%20R16/index_H.html">here</a>.<br />
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DIYAudio discussions <a href="http://www.diyaudio.com/forums/multi-way/268634-r16-constant-directivity-dipoles.html">here</a>.<br />
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<i>The 3D3A Lab was founded in 2008 by Professor Edgar Choueiri with a research grant he obtained from the Shostack Foundation to study fundamental aspects of spatial hearing in humans. The laboratory became operational in early 2009 and was completed later that year with the addition of an instrumented anechoic chamber.</i></blockquote>
While I had not heard the research's results the goal is very ambitious. <b>Imagine watching a 3D movie without those polarised glasses -- this is what our normal Stereo listening is like</b>. The research attempts to bring those 'glasses' into the audio world, hence the left and right ears receive correct sounds correspondingly.<br />
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Done correctly, the result would be the holy grail of recording and listening to music. Get a pair of headphones and <a href="https://www.youtube.com/watch?v=IUDTlvagjJA">listen to this recording</a> and <a href="https://www.youtube.com/watch?v=ecOrBqQAuXg">this</a> to get some ideas what could have been achieved.<br />
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<b>Update 10/2/15</b><br />
Outdoor measurement to determine directivity<br />
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjd3_VdUYOYgVvkVvSI7YOboGDkMXxD6Ff3V_EcV6au5-EYwt-tlRAiz_6NYHlxg1llIkrgNE6lZukQ8y-XUYV4X1OmJEL_7x3_zaKDF7dpGzT_rrCgHCx2eCSivOyOKlkM7xJpYKgJoOI/s1600/DSC_1258.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="131" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjd3_VdUYOYgVvkVvSI7YOboGDkMXxD6Ff3V_EcV6au5-EYwt-tlRAiz_6NYHlxg1llIkrgNE6lZukQ8y-XUYV4X1OmJEL_7x3_zaKDF7dpGzT_rrCgHCx2eCSivOyOKlkM7xJpYKgJoOI/s200/DSC_1258.jpg" width="200" /></a><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEh0oUIx41ugHIyeQbbJ4hCyCW2v4ux-8qz68uBVMImhyphenhyphenvBRecYUDff8kb6gQo-dinXFKktT_zB-S5m9_C0j-5e8gHeaZZ44i0YVY-MHicFh2YyxGGYy9Kqauh7tu0M3CueK0NUr8E77kn0/s1600/R16+sonogram.png" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="107" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEh0oUIx41ugHIyeQbbJ4hCyCW2v4ux-8qz68uBVMImhyphenhyphenvBRecYUDff8kb6gQo-dinXFKktT_zB-S5m9_C0j-5e8gHeaZZ44i0YVY-MHicFh2YyxGGYy9Kqauh7tu0M3CueK0NUr8E77kn0/s200/R16+sonogram.png" width="200" /></a></div>
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<b>Update 14/9/15</b></div>
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Princeton 3D3A published <a href="http://www.princeton.edu/3D3A/Directivity/Gainphile%20R16/index.html">measurement results of the R16</a>. They have very generously published results of 25+ other speakers too so audiophiles have a rare chance to look at independent party investigation on loudspeaker performance.</div>
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I am mostly happy that my outdoor measurement (using ironing board!) closely resemble the lab results. It validates that outdoor measurement with <a href="http://gainphile.blogspot.com/2008/11/cheap-and-accurate-speaker-measurement.html">cheap microphone</a> is sufficient for our hobby.<br />
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEh9yHfLZllzLkgioFOiF3qplZIYXES50ZW1gvXDJszctuaUpfPnaYym5m2kaAdeaTML2P2wVG7ccvEL3tZqk9PlQt4FNRhbwezuKZdl5d_IIBHNHrBVxhPw3Kzyyb42ZHQdbYSEtz6NmII/s1600/R16+3D3A.png" imageanchor="1" style="clear: left; float: left; margin-bottom: 1em; margin-right: 1em;"><img border="0" height="213" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEh9yHfLZllzLkgioFOiF3qplZIYXES50ZW1gvXDJszctuaUpfPnaYym5m2kaAdeaTML2P2wVG7ccvEL3tZqk9PlQt4FNRhbwezuKZdl5d_IIBHNHrBVxhPw3Kzyyb42ZHQdbYSEtz6NmII/s320/R16+3D3A.png" width="320" /></a></div>
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjJXl_VMTUZpimjtKo7d0x8bWAT09d33CSTe_fq8Xwxh7aywguOAh-ymemHeVISDPUzOpzRFUp7foOpy8tMis3YH0VHxVJaT641dUzl6MD9X0lZMse3lI5s6aAv6M60WhyphenhyphenZ6fse7OjXXx0/s1600/Gainphile+R16+H+Front+Contour+Plot.png" imageanchor="1" style="clear: left; float: left; margin-bottom: 1em; margin-right: 1em;"><img border="0" height="148" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjJXl_VMTUZpimjtKo7d0x8bWAT09d33CSTe_fq8Xwxh7aywguOAh-ymemHeVISDPUzOpzRFUp7foOpy8tMis3YH0VHxVJaT641dUzl6MD9X0lZMse3lI5s6aAv6M60WhyphenhyphenZ6fse7OjXXx0/s320/Gainphile+R16+H+Front+Contour+Plot.png" width="320" /></a></div>
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Unknownnoreply@blogger.com5tag:blogger.com,1999:blog-6998112391780171236.post-88359718352084975442014-07-30T03:19:00.000-07:002014-09-06T04:48:35.886-07:00S23 - Active Cardioid Loudspeakers<div dir="ltr" style="text-align: left;" trbidi="on">
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEh1pRy7Vd9RCEoGgGkK4y0G9EeIfmNZEBlrDrNd8taK_TXgohgeDdHU7Oc-cvfGNqwUOdivxRr8rjt2FOAvra1roqqmPOANKsaWicOMGHZhGmHuMthcvQK6MQd85x6sOAwI6YPB6qyI-Ig/s1600/S23+Active+Cardioid.png" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEh1pRy7Vd9RCEoGgGkK4y0G9EeIfmNZEBlrDrNd8taK_TXgohgeDdHU7Oc-cvfGNqwUOdivxRr8rjt2FOAvra1roqqmPOANKsaWicOMGHZhGmHuMthcvQK6MQd85x6sOAwI6YPB6qyI-Ig/s1600/S23+Active+Cardioid.png" height="348" width="400" /></a></div>
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Cardioid loudspeakers have <a href="http://www.wvier.de/texte/Beneficial%20of%20Coupling.pdf">desirable traits</a> when place in a room. However they are normally difficult to design and build. </div>
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Using <a href="http://gainphile.blogspot.com/2012/03/s19-4-way-dipole-radiator.html">S19 platform</a> two alternating channels are converted to monopoles, which provides the acoustic sum as Cardioid.</div>
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Follow the build discussions <a href="http://www.diyaudio.com/forums/multi-way/261329-s23-4-way-active-cardioid-loudspeakers.html">here at DIYAudio</a>.</div>
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<b>Outdoor polar response measurement result (7/9/14)</b></div>
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjUawz_FYwzv7VDDeGAd4ons9YJy8CJ9VkrFVWp3GETKQUfnkWAFwSGPBfUV5H8qWM94pMPql6wgD5K-tjD8n6mSU3XPjN2uL48lgnIndNfg34udyntF9U_A-bTqTu0PkY6L2T6QOlXXOY/s1600/B20khz-1600hz.png" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjUawz_FYwzv7VDDeGAd4ons9YJy8CJ9VkrFVWp3GETKQUfnkWAFwSGPBfUV5H8qWM94pMPql6wgD5K-tjD8n6mSU3XPjN2uL48lgnIndNfg34udyntF9U_A-bTqTu0PkY6L2T6QOlXXOY/s1600/B20khz-1600hz.png" height="132" width="200" /></a><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjX2FJYoZC7Q3-ox_gh9Ab5d5t4EV2ewfPn4hTUmTvmsDOE7WZgoT6JwsdOrCi8Ippr4dsIx5AsbJzEcwejY1qxgN3xK6X9KhbxILY431jlSXJDa6vjg6ZCFW85UCX83sj8kFiXaBSUGzQ/s1600/B1600hz-800hz.png" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjX2FJYoZC7Q3-ox_gh9Ab5d5t4EV2ewfPn4hTUmTvmsDOE7WZgoT6JwsdOrCi8Ippr4dsIx5AsbJzEcwejY1qxgN3xK6X9KhbxILY431jlSXJDa6vjg6ZCFW85UCX83sj8kFiXaBSUGzQ/s1600/B1600hz-800hz.png" height="132" width="200" /></a></div>
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20khz - 800hz</div>
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhVa4wdXMlpmhZOPpExYSZdTfufXE9gjJrpDlS_kWSd0hKEGcF_KnKwnI9QugyJ_2L9PJxPhjXD0vusT7UGyqPuKSRVA2igLssvdJbHAOM1a0RlpflFVcQhZvSZFOPZYU1Dgu7gLd1iMOk/s1600/B800hz-400hz.png" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhVa4wdXMlpmhZOPpExYSZdTfufXE9gjJrpDlS_kWSd0hKEGcF_KnKwnI9QugyJ_2L9PJxPhjXD0vusT7UGyqPuKSRVA2igLssvdJbHAOM1a0RlpflFVcQhZvSZFOPZYU1Dgu7gLd1iMOk/s1600/B800hz-400hz.png" height="132" width="200" /></a><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEg4yWguJ-cpQGuHcYZVMLqR9bsQSxG3ZnISB1Li9DTQMaGNWyCzFNJAvnaVsOCftC-DSXyiS6E5-eqWLN03Pe8ZpqzeOewJF1VC2LnDYkjWQ0XQJun_DoVI0QjiSZHG1JaLGQVLiuwlHV8/s1600/B400hz+to+20hz.png" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEg4yWguJ-cpQGuHcYZVMLqR9bsQSxG3ZnISB1Li9DTQMaGNWyCzFNJAvnaVsOCftC-DSXyiS6E5-eqWLN03Pe8ZpqzeOewJF1VC2LnDYkjWQ0XQJun_DoVI0QjiSZHG1JaLGQVLiuwlHV8/s1600/B400hz+to+20hz.png" height="133" width="200" /></a></div>
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800hz - 50hz</div>
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- The perfect Cardioid was never formed fully</div>
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- Forward directivity is maintain from 20khz down to 600hz. -6db less rear radiation or better. </div>
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- Then it transtition to a weak dipole to Omni. The transition is smooth and not abrupt.</div>
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Unknownnoreply@blogger.com0tag:blogger.com,1999:blog-6998112391780171236.post-79199716275014402142014-05-28T04:52:00.000-07:002014-05-29T04:58:49.541-07:00Epiphone Les Paul<div dir="ltr" style="text-align: left;" trbidi="on">
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<a href="http://2.bp.blogspot.com/-o8LUZrkduOg/U12uzPrHPuI/AAAAAAAAM0A/0QKBZR88b1A/s1600/19-3124754001.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" src="http://2.bp.blogspot.com/-o8LUZrkduOg/U12uzPrHPuI/AAAAAAAAM0A/0QKBZR88b1A/s1600/19-3124754001.jpg" height="267" width="400" /></a></div>
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I had developed fascination with Epiphone guitar. The one that I bought was the Les Paul Standard Pro. It basically means a version of Les Paul with the newer 'Pro' pickup. I can pull the knobs and make them single-coils (like Fender Stratocaster). It makes cleaner sound but picks up EMF hum as a compromise. The colour is 'Wine Red'</div>
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<a href="http://2.bp.blogspot.com/-y6dnodBRtfM/U21uuRr-1wI/AAAAAAAAM5U/jAfo9LeQ12g/s1600/DSC_8252.JPG" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" src="http://2.bp.blogspot.com/-y6dnodBRtfM/U21uuRr-1wI/AAAAAAAAM5U/jAfo9LeQ12g/s1600/DSC_8252.JPG" height="212" width="320" /></a></div>
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Few years ago Epiphone produced the 'Valve Junior' Amplifiers. They are simple tube amps and was very popular for modders. The one that I got is known as 'V2' and is in pristine condition as shown below.<br />
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<a href="http://4.bp.blogspot.com/-SbZR6qMGAog/U21uvR2qp8I/AAAAAAAAM5k/sLe2l6_n3mM/s1600/DSC_8265.JPG" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" src="http://4.bp.blogspot.com/-SbZR6qMGAog/U21uvR2qp8I/AAAAAAAAM5k/sLe2l6_n3mM/s1600/DSC_8265.JPG" height="212" width="320" /></a></div>
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<a href="http://2.bp.blogspot.com/-xCBNhWEjXo4/U231Ago7a4I/AAAAAAAAM6A/B3ypjiKDyJ0/s1600/Attenuator.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" src="http://2.bp.blogspot.com/-xCBNhWEjXo4/U231Ago7a4I/AAAAAAAAM6A/B3ypjiKDyJ0/s1600/Attenuator.jpg" height="187" width="320" /></a></div>
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Although the amp is only 5 watts, the 8" loudspeaker is of high efficiency type, like normal guitar speakers. So they play VERY loud. I had to build a plug-in attenuator above so not to disturb the house/neighbours.</div>
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<a href="http://2.bp.blogspot.com/-U7bcjwGoG-0/U4b6WZhQu8I/AAAAAAAANDg/XQAMyJ4DC0g/s1600/DSC_8438.JPG" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" src="http://2.bp.blogspot.com/-U7bcjwGoG-0/U4b6WZhQu8I/AAAAAAAANDg/XQAMyJ4DC0g/s1600/DSC_8438.JPG" height="212" width="320" /></a></div>
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Distortion pedal, also by Epiphone! was added in May 2014.</div>
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The guitar community is very large and friendly (ie. mylespaul.com). I learnt few new terms like GAS (guitar acquisition syndrome), NGD (new guitar day), etc. There are endless discussions on tone for example. It's not unlike the HiFi scene and one can easily go down the slippery slope.</div>
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I have promised myself: 1 guitar, LOTS of practice !</div>
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Unknownnoreply@blogger.com1tag:blogger.com,1999:blog-6998112391780171236.post-60365536808471587782013-10-24T04:40:00.000-07:002013-10-26T07:35:23.604-07:008-Channel eBay Remote Volume Control<div dir="ltr" style="text-align: left;" trbidi="on">
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjO8o-cyMFfT0kkoM3FRDhFeNEgZW4KTCXOFzP0aoPacS2yI6EzLodgPttDWUOvQ5upWoFsBHnt9oJjcvgppOcenm5Q-zefRY_jzYhUn4h9EMgxZkQ1MBv2N_iFPlHikxQWbvMT6-OTph8/s1600/02+0db+Distortion+compare.png" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="221" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjO8o-cyMFfT0kkoM3FRDhFeNEgZW4KTCXOFzP0aoPacS2yI6EzLodgPttDWUOvQ5upWoFsBHnt9oJjcvgppOcenm5Q-zefRY_jzYhUn4h9EMgxZkQ1MBv2N_iFPlHikxQWbvMT6-OTph8/s320/02+0db+Distortion+compare.png" width="320" /></a></div>
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjE99a4D7WLtoU46YtmN04pJy0Cl9NtgbhFx5SEK0OD6H4ZdPqD8b1gL5ywM8tLf3tXy3Rov6TBgnjpN8ic-8L0FOXlVcXTeptkLVOtNsuFcuYDbZYn6Iw06tymRlRtFhwQ0IJRgUA0h10/s1600/02+0db+magnitude+compare.png" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="199" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjE99a4D7WLtoU46YtmN04pJy0Cl9NtgbhFx5SEK0OD6H4ZdPqD8b1gL5ywM8tLf3tXy3Rov6TBgnjpN8ic-8L0FOXlVcXTeptkLVOtNsuFcuYDbZYn6Iw06tymRlRtFhwQ0IJRgUA0h10/s320/02+0db+magnitude+compare.png" width="320" /></a></div>
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEioAHD_49rS_nbm6fUCfeTSzMmVbTib-UWCXnOSvVQz3SL3vEEK4teg2k6AxIv_NqsHgpkAT4mav8tgZFFwkcSX4MbCLPH1Sg0CMDwfiOYIVnlvVQdvDtWh85wEQIUGm1zDQtTTdXNQrJU/s1600/03+Magnitude+compare.png" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="205" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEioAHD_49rS_nbm6fUCfeTSzMmVbTib-UWCXnOSvVQz3SL3vEEK4teg2k6AxIv_NqsHgpkAT4mav8tgZFFwkcSX4MbCLPH1Sg0CMDwfiOYIVnlvVQdvDtWh85wEQIUGm1zDQtTTdXNQrJU/s320/03+Magnitude+compare.png" width="320" /></a></div>
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhBOoJF9I_Et8NMf1yHqKM8phjBSCVH2IRvWOk1XTvYZ5wwpK2gGf5qfd4-6jsJSkB8uLcKo6cN5pj_DIcBA9oRB5eyMK4-ml1ua43YXRsj3gg0hKMFgAynAm8CtFZ0eDxbNQWKf4nVM94/s1600/DSC_6609.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="212" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhBOoJF9I_Et8NMf1yHqKM8phjBSCVH2IRvWOk1XTvYZ5wwpK2gGf5qfd4-6jsJSkB8uLcKo6cN5pj_DIcBA9oRB5eyMK4-ml1ua43YXRsj3gg0hKMFgAynAm8CtFZ0eDxbNQWKf4nVM94/s320/DSC_6609.jpg" width="320" /></a></div>
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjgAXM3p6xLOwUzk1-oE5NthpPJQn5yAnHUEoUojqb18jbsKpOWXFIQsziVPNd-u9sDFstUuQFO-jt951R4vxKQrRq7n_FQqJh9pOHHXMhLgb1T_9Suhzrne3rEVw4DlhuUUWSZ4CmelXg/s1600/DSC_6637.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="212" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjgAXM3p6xLOwUzk1-oE5NthpPJQn5yAnHUEoUojqb18jbsKpOWXFIQsziVPNd-u9sDFstUuQFO-jt951R4vxKQrRq7n_FQqJh9pOHHXMhLgb1T_9Suhzrne3rEVw4DlhuUUWSZ4CmelXg/s320/DSC_6637.jpg" width="320" /></a></div>
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEh_y3X_Xm9R6tSs0Zv54mgRdKxxTLxfxEN4sO5KK3Onb70Keg0C4RsZAosk8rqyO8nrNkUgm0vl1k2tWBEnzyxS-6Jq3p0TJ990gay5t4cIrplfOVBhiVYBW_xY-2aOk7yFc_AvtJwm6eA/s1600/DSC_6640.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="212" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEh_y3X_Xm9R6tSs0Zv54mgRdKxxTLxfxEN4sO5KK3Onb70Keg0C4RsZAosk8rqyO8nrNkUgm0vl1k2tWBEnzyxS-6Jq3p0TJ990gay5t4cIrplfOVBhiVYBW_xY-2aOk7yFc_AvtJwm6eA/s320/DSC_6640.jpg" width="320" /></a></div>
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Unknownnoreply@blogger.com4tag:blogger.com,1999:blog-6998112391780171236.post-704968848503443142012-11-07T17:38:00.000-08:002013-07-04T19:30:10.930-07:00EP21 - Single Stereo Speakers (SSS)<div dir="ltr" style="text-align: left;" trbidi="on">
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjAWrFvPV5mue2cCY-UCzQUfteFLH1-hr1B7tXLetHh5RsL1JvLB_OHQGtR34aEPOT1gZN20rYWTgqkLSZO3PgaHBxj06nda_g8-jmfa8u5qUzDIEnPeRLOmPleFco0NCCUmxDDhXsVC24/s1600/EP21.png" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="248" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjAWrFvPV5mue2cCY-UCzQUfteFLH1-hr1B7tXLetHh5RsL1JvLB_OHQGtR34aEPOT1gZN20rYWTgqkLSZO3PgaHBxj06nda_g8-jmfa8u5qUzDIEnPeRLOmPleFco0NCCUmxDDhXsVC24/s400/EP21.png" width="400" /></a></div>
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My 21st loudspeakers are implementation of Elias Pekonen's Single Stereo Speakers (SSS). This unique concept utilise single, center-positioned main with front and side firing drivers and actively utilise room reflections as important aspect of sound reproduction.<br />
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The drivers radiate as follows:<br />
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjFu6eqTrq_ynLPE0RdYkX_YF65FWzgVhETmgUbC_1G69xPJqa9aMIXGDdLHKfp_XL3ZEyYzILE8t-GfnJhR2WDQI_qnfiHDQuN_SQJQZoo7AkT1JFrt6eERYYeslsnrJXC_wdLpjvHrIE/s1600/EP21+diagram.png" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="200" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjFu6eqTrq_ynLPE0RdYkX_YF65FWzgVhETmgUbC_1G69xPJqa9aMIXGDdLHKfp_XL3ZEyYzILE8t-GfnJhR2WDQI_qnfiHDQuN_SQJQZoo7AkT1JFrt6eERYYeslsnrJXC_wdLpjvHrIE/s200/EP21+diagram.png" width="130" /></a></div>
As you can see this is a unique approach to Stereo reproduction.<br />
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You can read the full concept at <a href="http://dl.dropbox.com/u/2400456/html/Elias_Pekonen/SingleSpeakerStereo.html">Elias' website</a>.<br />
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The build progress are posted at <a href="http://www.diyaudio.com/forums/multi-way/222698-ep21-single-stereo-loudspeakers.html">DIYAudio</a><br />
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<span style="background-color: white; color: #ff6600; font-weight: bold;"><span style="font-family: inherit;">Specifications</span></span><br />
Topology: Active 2-way<br />
Radiation pattern: Single speaker, front and side-firing<br />
Directivity: Monopole side-front waveplane. Dipole or Cardioid bass 200hz and below<br />
Frequency response: 20hz - 18khz.<br />
Sensititivity: ~83dB<br />
Dimension (H, W, D): TBD<br />
Amplifiers: 4-Channels required (2x stereo amps) <br />
Crossover: One 2x4 MiniDSP<br />
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Update 2/11/12 - Project brief posted at DIYAudio<br />
Update 8/11/12 - First design posted<br />
Update 13/11/12 - Drivers arrived, 3x HiVi B3N<br />
Update 23/1/13 - No progress yet ....!<br />
Update 5/7/13 - No progress ... I better pull my finger out :) <br />
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Next: Build the cabinet</div>
Unknownnoreply@blogger.com12tag:blogger.com,1999:blog-6998112391780171236.post-33709107370868935922012-09-17T22:41:00.000-07:002012-09-18T22:43:14.005-07:00Upside down / down-firing woofer<div>
Vertical driver orientation like inverted W-Frame used in S19 requires specific requirements as follows:</div>
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<a href="http://redspade-audio.blogspot.com.au/2012/03/will-this-driver-work-down-firing.html">http://redspade-audio.blogspot.com.au/2012/03/will-this-driver-work-down-firing.html</a>
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Old archive from Adire Audio:<div>
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<span style="background-color: white; font-family: arial, Arial, Helvetica; text-align: -webkit-left;">Often times, you'd like to mount a driver facing down, such as in a Sonotube™ enclosure. However, you may not be sure whether the driver you have is suitable for such an arrangement. Will the driver hold up to horizontal mounting? Will the relentless pull of gravity be too much, and cause intolerable amounts of sag?Well, there's actually a way to calculate the sag a driver will exhibit when mounted in a downfiring (or upfiring) position! And you don't need anything more than the Fs, Vas, effective surface area (Sd), and the Xmax of the driver.<br />
To calculate the sag, we first need to calculate the acoustic compliance of the driver. That is, how soft is <span style="font-family: century gothic, arial, helvetica;">the suspension? This parameter is called Cms, and is related to Vas. Cms</span> is the acoustic compliance of the driver, and has the units of meters per Newton. It is calculated as:<br />
<blockquote>
<small><span style="font-family: Courier;">Cms = Vas / (1180 * c^2 * (Sd/10000)^2)</span></small></blockquote>
where</span><blockquote style="background-color: white; text-align: -webkit-left;">
<span style="font-family: arial, Arial, Helvetica;"></span><table border="0" cellpadding="0" cellspacing="0" style="width: 100%px;"><tbody>
<tr><td valign="top" width="42"><img alt="bullet" height="22" hspace="10" src="http://web.archive.org/web/20031009114116im_/http://www.adireaudio.com/_themes/pvmaxgre/mgbull1.gif" width="22" /></td><td valign="top" width="100%"><span style="font-family: arial, Arial, Helvetica;"><span style="font-family: Courier;">Vas is the equivalent compliance of the driver, in liters</span></span></td></tr>
<tr><td valign="baseline" width="42"><img alt="bullet" height="22" hspace="10" src="http://web.archive.org/web/20031009114116im_/http://www.adireaudio.com/_themes/pvmaxgre/mgbull1.gif" width="22" /></td><td valign="top" width="100%"><span style="font-family: arial, Arial, Helvetica;"><span style="font-family: Courier;">c is the speed of sound, in m/s (use 343 m/s as a good approximation)</span></span></td></tr>
<tr><td valign="baseline" width="42"><img alt="bullet" height="22" hspace="10" src="http://web.archive.org/web/20031009114116im_/http://www.adireaudio.com/_themes/pvmaxgre/mgbull1.gif" width="22" /></td><td valign="top" width="100%"><span style="font-family: arial, Arial, Helvetica;"><span style="font-family: Courier;">Sd is the effective surface area of the driver, in square cm</span></span></td></tr>
</tbody></table>
<span style="font-family: arial, Arial, Helvetica;"></span></blockquote>
<span style="background-color: white; font-family: arial, Arial, Helvetica; text-align: -webkit-left;">Note that you can use the following table for rough Sd estimates for drivers:</span><table border="2" bordercolordark="#000000" bordercolorlight="#C0C0C0" cellpadding="0" cellspacing="0" style="background-color: white; border-collapse: collapse; width: 90%px;"><tbody>
<tr><td width="50%"><span style="font-family: arial, Arial, Helvetica;">Size</span></td><td width="50%"><span style="font-family: arial, Arial, Helvetica;">Sd</span></td></tr>
<tr><td width="50%"><span style="font-family: arial, Arial, Helvetica;">8"</span></td><td width="50%"><span style="font-family: arial, Arial, Helvetica;">230 cm<sup><span style="font-family: Arial;">2</span></sup></span></td></tr>
<tr><td width="50%"><span style="font-family: arial, Arial, Helvetica;">10"</span></td><td width="50%"><span style="font-family: arial, Arial, Helvetica;">330 cm<sup><span style="font-family: Arial;">2</span></sup></span></td></tr>
<tr><td width="50%"><span style="font-family: arial, Arial, Helvetica;">12"</span></td><td width="50%"><span style="font-family: arial, Arial, Helvetica;">480 cm<sup><span style="font-family: Arial;">2</span></sup></span></td></tr>
<tr><td width="50%"><span style="font-family: arial, Arial, Helvetica;">15"</span></td><td width="50%"><span style="font-family: arial, Arial, Helvetica;">780 cm<sup><span style="font-family: Arial;">2</span></sup></span></td></tr>
<tr><td width="50%"><span style="font-family: arial, Arial, Helvetica;">18"</span></td><td width="50%"><span style="font-family: arial, Arial, Helvetica;">1150 cm<sup><span style="font-family: Arial;">2</span></sup></span></td></tr>
</tbody></table>
<span style="background-color: white; font-family: arial, Arial, Helvetica; text-align: -webkit-left;">Now that we have the Cms of the driver, we'll need to calculate the effective mass of the driver, Mmd. For this, we'll need Cms and Fs.<br />
<span style="font-family: century gothic, arial, helvetica;"><blockquote>
<small><span style="font-family: Courier;">Mms = 1 / ((2*pi*Fs)^2 * Cms)</span></small></blockquote>
</span>where</span><blockquote style="background-color: white; text-align: -webkit-left;">
<span style="font-family: arial, Arial, Helvetica;"></span><table border="0" cellpadding="0" cellspacing="0" style="width: 100%px;"><tbody>
<tr><td valign="top" width="42"><img alt="bullet" height="22" hspace="10" src="http://web.archive.org/web/20031009114116im_/http://www.adireaudio.com/_themes/pvmaxgre/mgbull1.gif" width="22" /></td><td valign="top" width="100%"><span style="font-family: arial, Arial, Helvetica;"><span style="font-family: Courier;">pi = 3.1415927...</span></span></td></tr>
<tr><td valign="baseline" width="42"><img alt="bullet" height="22" hspace="10" src="http://web.archive.org/web/20031009114116im_/http://www.adireaudio.com/_themes/pvmaxgre/mgbull1.gif" width="22" /></td><td valign="top" width="100%"><span style="font-family: arial, Arial, Helvetica;"><span style="font-family: Courier;">Fs is the resonant frequency, in Hz</span></span></td></tr>
<tr><td valign="baseline" width="42"><img alt="bullet" height="22" hspace="10" src="http://web.archive.org/web/20031009114116im_/http://www.adireaudio.com/_themes/pvmaxgre/mgbull1.gif" width="22" /></td><td valign="top" width="100%"><span style="font-family: arial, Arial, Helvetica;"><span style="font-family: Courier;">Cms is as calculated above</span></span></td></tr>
</tbody></table>
<span style="font-family: arial, Arial, Helvetica;"></span></blockquote>
<span style="background-color: white; font-family: arial, Arial, Helvetica; text-align: -webkit-left;">So, with the Mms and Cms, we're almost there. To calculate the actual sag, you'll need to multiply the stiffness of the suspension times the mass of the diphragm times the pull of gravity:<br />
<span style="font-family: century gothic, arial, helvetica;"><blockquote>
<small><span style="font-family: Courier;">Sag = Cms * Mms * g</span></small></blockquote>
</span>where</span><blockquote style="background-color: white; text-align: -webkit-left;">
<span style="font-family: arial, Arial, Helvetica;"></span><table border="0" cellpadding="0" cellspacing="0" style="width: 100%px;"><tbody>
<tr><td valign="top" width="42"><img alt="bullet" height="22" hspace="10" src="http://web.archive.org/web/20031009114116im_/http://www.adireaudio.com/_themes/pvmaxgre/mgbull1.gif" width="22" /></td><td valign="top" width="100%"><span style="font-family: arial, Arial, Helvetica;"><span style="font-family: Courier;">Cms is as calculated above</span></span></td></tr>
<tr><td valign="baseline" width="42"><img alt="bullet" height="22" hspace="10" src="http://web.archive.org/web/20031009114116im_/http://www.adireaudio.com/_themes/pvmaxgre/mgbull1.gif" width="22" /></td><td valign="top" width="100%"><span style="font-family: arial, Arial, Helvetica;"><span style="font-family: Courier;">Mms is as calculated above</span></span></td></tr>
<tr><td valign="baseline" width="42"><img alt="bullet" height="22" hspace="10" src="http://web.archive.org/web/20031009114116im_/http://www.adireaudio.com/_themes/pvmaxgre/mgbull1.gif" width="22" /></td><td valign="top" width="100%"><span style="font-family: arial, Arial, Helvetica;"><span style="font-family: Courier;">g is the acceleration of gravity (9.81 m/s<sup>2</sup>)</span></span></td></tr>
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<span style="font-family: arial, Arial, Helvetica;"></span></blockquote>
<span style="background-color: white; font-family: arial, Arial, Helvetica; text-align: -webkit-left;">This will give us the sag in meters. So, multiply by 1000 to get to millimeters. Here's an example, using our Shiva subwoofer:<br />
<span style="font-family: century gothic, Arial, Helvetica;"><blockquote>
<small><span style="font-family: Courier;">Vas = 136.6 liters<br />Fs = 21.6 Hz<br />Sd = 481 cm^2</span></small></blockquote>
</span>So, we calculate the Cms as:<br />
<span style="font-family: century gothic, Arial, Helvetica;"><blockquote>
<small><span style="font-family: Courier;">Cms = Vas / (1180 * c^2 * (Sd/10000)^2)<br />Cms = 136.6 / (1180 * 343^2 * (481/10000)^2)<br />Cms = 0.0004253</span></small></blockquote>
</span>So, now we calculate the Mms:<br />
<span style="font-family: century gothic, Arial, Helvetica;"><blockquote>
<small><span style="font-family: Courier;">Mms = 1 / ((2*pi*Fs)^2 * Cms)<br />Mms = 1 / (2 * 3.1415927 * 21.6)^2 * 0.0004253)<br />Mms = 0.12766 kilograms</span></small></blockquote>
</span>or 127.66 grams. Lastly, we need to calculate the sag of the driver:<br />
<span style="font-family: century gothic, Arial, Helvetica;"></span><blockquote>
<span style="font-family: century gothic, Arial, Helvetica;"></span><span style="font-family: century gothic, Arial, Helvetica;"><span style="font-family: Courier;"><small>Sag = Cms * Mms * g<br />Sag = 0.0004253 * 0.12766 * 9.81<br />Sag = 0.0005326 meters</small></span></span><span style="font-family: Courier;"><small>Sag =</small></span><span style="font-family: century gothic, arial, helvetica;"><span style="font-family: Courier;"><small> 0.5326mm. </small></span></span><br />
<span style="font-family: century gothic, arial, helvetica;"></span></blockquote>
<span style="font-family: century gothic, arial, helvetica;"></span>So, that's all fine and dandy. We can calculate sag. But what does it mean, and how can it tell us if the driver is OK for horizontal mounting? Well, as a general rule-of-thumb, we use the following:<br />
<span style="font-family: century gothic, Arial, Helvetica;"></span><span style="font-family: century gothic, Arial, Helvetica;"><strong><small><span style="font-family: Arial;">If the sag is more than 5% </span></small></strong></span><strong><small><span style="font-family: Arial;">If the sag is more than 5% </span></small><span style="font-family: Arial;"><small>of</small></span><span style="font-family: century gothic, Arial, Helvetica;"><small><span style="font-family: Arial;"> the Xmax of the driver, then it's not meant for horizontal mounting.</span></small></span></strong><br />
<strong></strong>Simply put, if you lose more than 1/20th of your Xmax from sag, then it shouldn't be mounted that way. To finish off the example, let's look at Shiva:<br />
<span style="font-family: century gothic, Arial, Helvetica;"><strong></strong></span><blockquote>
<span style="font-family: century gothic, Arial, Helvetica;"><strong></strong></span><span style="font-family: century gothic, Arial, Helvetica;"><strong><span style="font-family: Courier;"><small>Xmax = 1</small></span></strong></span><strong><small><span style="font-family: Courier;">5<span style="font-family: century gothic, Arial, Helvetica;">.9mm one way<br />Sag = 0.5326mm<br />Percent Sag = (Sag / Xmax) * 100<br />Percent Sag = (0.5326 / 1</span></span></small><span style="font-family: Courier;"><small>5<span style="font-family: century gothic, Arial, Helvetica;">.9) * 100<br />Percent Sag = 3.</span>35</small></span><span style="font-family: century gothic, Arial, Helvetica;"><span style="font-family: Courier;"><small>%</small></span></span></strong><br />
<strong><span style="font-family: century gothic, Arial, Helvetica;"></span></strong></blockquote>
<strong><span style="font-family: century gothic, Arial, Helvetica;"></span></strong></span><div style="background-color: white; text-align: -webkit-left;">
<span style="font-family: arial, Arial, Helvetica;">So, Shiva would be OK for horizontal mounting. And now you can calculate the suitability of your favorite driver, too! Just run the numbers, and if you're less than 5% of Xmax, you're sitting pretty!</span></div>
</div>
Unknownnoreply@blogger.com1tag:blogger.com,1999:blog-6998112391780171236.post-90194800108188204882012-08-25T05:03:00.000-07:002012-12-17T14:28:07.545-08:00Work in Progress<div dir="ltr" style="text-align: left;" trbidi="on">
<span style="font-size: large;">Random notes of work in progress</span><br />
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18/12/12 - <span style="color: red;"><b>Observations and measurement of Nao Note</b></span><br />
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NaO (and Orions) commercial kit offering designed by experts in the field. It is a reference design. Particulary with Nao Note variant where it is desired to maintain true dipole polar response to high frequencies.<br />
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DIYAudio link: <a href="http://www.diyaudio.com/forums/multi-way/163072-nao-note-preview-16.html">http://www.diyaudio.com/forums/multi-way/163072-nao-note-preview-16.html</a> <br />
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9/11/12 - <span style="color: red;"><b>S22 Improving high frequency directivity</b></span></div>
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjlUxKjPCvvJ00iThyphenhyphen7szNbqY4kUTpUkBTF5_4_AqbLrSksMnNjPmhLo89qSrDI_z8DiPuJf1jzO5lbBHRW4ol9ST74g5kBXoHcT0aAWDO3mXKYQ0NQTUUrv5yCP1ijP5o9Ms7oc3TkXDk/s1600/s22.png" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="320" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjlUxKjPCvvJ00iThyphenhyphen7szNbqY4kUTpUkBTF5_4_AqbLrSksMnNjPmhLo89qSrDI_z8DiPuJf1jzO5lbBHRW4ol9ST74g5kBXoHcT0aAWDO3mXKYQ0NQTUUrv5yCP1ijP5o9Ms7oc3TkXDk/s320/s22.png" width="296" /></a></div>
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<a href="http://www.diyaudio.com/forums/multi-way/223190-s22-latest-dipole-bandwagon.html">http://www.diyaudio.com/forums/multi-way/223190-s22-latest-dipole-bandwagon.html</a></div>
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9/10/12 - <span style="color: red;"><b>Cardioid using W-Frame</b></span></div>
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I proposed that sealing one of the slots in W-Frame dipoles could yield Cardioid response.</div>
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<a href="http://www.diyaudio.com/forums/multi-way/221153-cardioid-bass-yes-very-good.html">http://www.diyaudio.com/forums/multi-way/221153-cardioid-bass-yes-very-good.html</a></div>
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<a href="http://2.bp.blogspot.com/-9ukQwQr0nuk/UHLaRMHQjrI/AAAAAAAAIdw/l3zw2MPhKTs/s1600/dipole.JPG" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="200" src="http://2.bp.blogspot.com/-9ukQwQr0nuk/UHLaRMHQjrI/AAAAAAAAIdw/l3zw2MPhKTs/s200/dipole.JPG" width="134" /></a><a href="http://1.bp.blogspot.com/-9iHNwvqDqUY/UHLaRSQuJMI/AAAAAAAAId0/Fj43ARz3gS8/s1600/cardioid.JPG" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="200" src="http://1.bp.blogspot.com/-9iHNwvqDqUY/UHLaRSQuJMI/AAAAAAAAId0/Fj43ARz3gS8/s200/cardioid.JPG" width="134" /></a></div>
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14/9/12 -<span style="color: red;"> <b>Z-Frame Dipole Subwoofer</b></span></div>
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Small dipole loudspeakers are competing requirements due to the need for pushing air with large woofers.</div>
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Here is an idea to squeeze the footprint even more by using opposing force. </div>
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<a href="http://4.bp.blogspot.com/-R1N4GQyvuv0/UFMGBBlsdFI/AAAAAAAAIW8/TWi5-m7Zd90/s1600/S20z+ZFrame.png" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="320" src="http://4.bp.blogspot.com/-R1N4GQyvuv0/UFMGBBlsdFI/AAAAAAAAIW8/TWi5-m7Zd90/s320/S20z+ZFrame.png" width="234" /></a></div>
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29/8/12<br />
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After three coats of Tung Oil</div>
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26/8/12</div>
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Routing and fitting baffle to 'furniturise' S19.</div>
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Perfect fit for both Seas DXT and Vifa XT25 tweeters. Uncoated baffles.</div>
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25/8/12</div>
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Mahogany (Eastern) test finish. 1 coat of Tung Oil</div>
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEg94t6Yt4TslPWqqHankuTcJFq7fIeGMEQFrI1XxvYWfRTcwrTbTv0YWMdZfnU-3a8ctwZKsy_sxHjlWL16ognN_ct5i7ES9Vk3yIyzWGN7QuM0xRIRsPJZncwtew7C1VzgC-QtnJO56UU/s1600/DSC_2433.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="265" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEg94t6Yt4TslPWqqHankuTcJFq7fIeGMEQFrI1XxvYWfRTcwrTbTv0YWMdZfnU-3a8ctwZKsy_sxHjlWL16ognN_ct5i7ES9Vk3yIyzWGN7QuM0xRIRsPJZncwtew7C1VzgC-QtnJO56UU/s400/DSC_2433.jpg" width="400" /></a>
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Unknownnoreply@blogger.com3tag:blogger.com,1999:blog-6998112391780171236.post-22910356392839516672012-06-27T23:17:00.000-07:002015-07-14T18:58:44.463-07:00S20-Z Compact Open Baffle using Zaph Kit<div dir="ltr" style="text-align: left;" trbidi="on">
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEg3rJXvGKjPBO_cNuUs7oIUfHDy46sdmkIG6nTqwFgVmYawMd4pOoXYNawh8NdNgqFJRa6t2tmDUrF1QlumicHf8W3XSJ6LdewCP5F7JV_rW74_Lh6ookUIQdSly6xNgMC8AeFnRbFCpy8/s1600/Zaph+Dipole.png" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEg3rJXvGKjPBO_cNuUs7oIUfHDy46sdmkIG6nTqwFgVmYawMd4pOoXYNawh8NdNgqFJRa6t2tmDUrF1QlumicHf8W3XSJ6LdewCP5F7JV_rW74_Lh6ookUIQdSly6xNgMC8AeFnRbFCpy8/s1600/Zaph+Dipole.png" /></a></div>
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This design was announced as <a href="https://lh3.googleusercontent.com/-FyXB_GH_kwI/VaW-CmsVI9I/AAAAAAAAY78/iWaYDoW7knw/s958-Ic42/Zaph%252520Contest.png">winner</a> of <a href="http://zaphaudio.com/blog.html">Zaph Design Contest.</a> The design had gone through some changes but you can read the <a href="https://lh5.googleusercontent.com/-VMqRjTsHBL8/UBpznNoy2II/AAAAAAAAIJA/o86O9Eqw_g0/s705/Zaph%2520Contest%2520submission.png">original submission</a>.</div>
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Follow the build discussions at <a href="http://www.htguide.com/forum/showthread.php4?t=40124">HTGuide Forum</a>.<br />
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<span style="font-size: large;">Concept:</span><br />
Compact and economical Open Baffle design, similar dimensions to a typical 5" hifi floorstander!<br />
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While open baffle loudspeakers provide the outmost transparency and openness due to absence of box, they are normally very large and expensive to build. Zaph had done the hard work of providing an excellent 2-way loudspeaker kit, and we simply take this kit as a basis for this design.<br />
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The loudspeakers need additional woofers to reach 20hz, and any 10” with decent xmax will do. Extremely large subwoofers, in fact, are not advisable due to size constraints. I use Jaycar 10” woofers bought for about $15 each.<br />
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<span style="font-size: large;">Specifications</span><br />
Design : 3-way Open Baffle using Hybrid crossovers<br />
Frequency Response : 20Hz – 20kHz<br />
Polar response : Dipole 20hz to 1.8khz, then forward directional<br />
Crossovers : 1.8khz M-T, 220hz W-M (Asymmetric). With dipole correction<br />
Placement : 80cm minimum from front walls, 50cm from sides<br />
Size (H x W x D): 97cm x 23cm x 27cm<br />
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Tweeters: Vifa DQ25SC16-04</div>
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Midbass: Zaph|Audio ZA14W08</div>
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Woofers: 4x 10"</div>
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<span style="font-size: large;">Crossovers</span></div>
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The loudspeakers require 4 channels of amplification and use hybrid design to achive this:</div>
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjKldMMNPvEIsS6vrxCirOo7NndXB7Ffb_5JHPwS1rUOPnzRE4Y-sSI1hzv-XUe__eshfY860kjBf57ZZQHYfr35gBYF5LnTvwk0VKwho3mpWVkj-H6cAkYANB-9Tfp4SFUzPj3v3KUeiI/s1600/Zaph+Dipole+Crossovers.png" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="135" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjKldMMNPvEIsS6vrxCirOo7NndXB7Ffb_5JHPwS1rUOPnzRE4Y-sSI1hzv-XUe__eshfY860kjBf57ZZQHYfr35gBYF5LnTvwk0VKwho3mpWVkj-H6cAkYANB-9Tfp4SFUzPj3v3KUeiI/s320/Zaph+Dipole+Crossovers.png" width="320" /></a></div>
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Midrange-Tweeter section uses ZA5.2TM kit’s crossover, passing the signal for dipole eq first. The Dipole EQ is quite simple: a notch filter and lowpass-shelving filter</div>
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<span style="font-size: large;">Bill of Material</span></div>
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Zaph ZA5.2TM Kit (Madisound), pair<span class="Apple-tab-span" style="white-space: pre;"> </span>$200</div>
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10” woofers, 4x<span class="Apple-tab-span" style="white-space: pre;"> </span>$80 - $100</div>
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XO / dipole eq options:</div>
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- MiniDSP<span class="Apple-tab-span" style="white-space: pre;"> </span>$100, or </div>
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- DIY op-amp based<span class="Apple-tab-span" style="white-space: pre;"> </span>$30-$40 </div>
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiqHprixr0hXmwc_epSJToxdPOJcWS1u_Z4zERMQKZyZiQrxlhnn5hp9MNQqxgUpj0_2ICDN73b_MpAscLWGs528bMapiQUsnhwKUmNfUjU2XcS3SZC05m2kuOXNmW5fQF9KjEAaK-Iohs/s1600/s20z.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="400" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiqHprixr0hXmwc_epSJToxdPOJcWS1u_Z4zERMQKZyZiQrxlhnn5hp9MNQqxgUpj0_2ICDN73b_MpAscLWGs528bMapiQUsnhwKUmNfUjU2XcS3SZC05m2kuOXNmW5fQF9KjEAaK-Iohs/s400/s20z.jpg" width="287" /></a></div>
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<span style="font-size: large;">MiniDSP Crossover Settings</span><br />
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<b><span style="color: red;">Woofer Section:</span></b><br />
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjYVvN3ef4ktcsxXvmaqb9EmmiKFriiRW0THa8M0pc1-eJ9_MJoyKkjuSKQBTNUzK71Yg10007KIzwBrc-GrhWJSnyEMOSIRSbDotNjkfVUPfUeL_c8_lg6tBuTEIQClWdne6yAEeOjiXo/s1600/W+overall.png" imageanchor="1" style="clear: left; display: inline !important; float: left; margin-bottom: 1em; margin-right: 1em;"><img border="0" height="71" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjYVvN3ef4ktcsxXvmaqb9EmmiKFriiRW0THa8M0pc1-eJ9_MJoyKkjuSKQBTNUzK71Yg10007KIzwBrc-GrhWJSnyEMOSIRSbDotNjkfVUPfUeL_c8_lg6tBuTEIQClWdne6yAEeOjiXo/s320/W+overall.png" width="320" /></a></div>
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<a href="https://lh4.googleusercontent.com/-NlgGwcg0mOk/UIEtcK1Wb4I/AAAAAAAAIgI/8mf5EFZTr_k/s720/W%2520XO.png">Image</a> - 220Hz LR4 Crossover<br />
<a href="https://lh4.googleusercontent.com/-zYnusn4bCfc/UIEy7TbJgiI/AAAAAAAAIhM/b_3EFB2ZXlo/s720/W%2520Notch.png" target="_blank">Image</a> - 330Hz/-16dB/2.8Q quarterwave resonance notch filter (<a href="https://lh4.googleusercontent.com/-6vgRW81Wq24/UIExytQUBPI/AAAAAAAAIgk/bES3s-X8_VY/s720/W%2520Notch.png" target="_blank">measured</a>)<br />
<a href="https://lh4.googleusercontent.com/-n25LOdN6rN0/UIEx0MBWSEI/AAAAAAAAIg0/VvkH3Mrn9rw/s720/W%2520LT.png" target="_blank">Image</a> - 20Hz/0.7Q Linwitz Transform biquad correction (<a href="https://lh5.googleusercontent.com/-2t0FCkjFHZ8/UIExz6cMPMI/AAAAAAAAIgs/IgJ267TKOhs/s720/W%2520measured%2520LT.png" target="_blank">measured</a>)<br />
<a href="https://lh5.googleusercontent.com/-vns9CQpYjqA/UIExz84Y8CI/AAAAAAAAIgw/jdBu1-LPAK4/s720/W%2520SLP.png" target="_blank">Image</a> - 6db/oct Dipole rolloff EQ<br />
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The above Linkwitz Transform is for Jaycar CW2139. It will be different for other woofers, depending on the original Fs and Qts of the driver.<br />
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A very good value Woofer is <a href="http://www.parts-express.com/pe/showdetl.cfm?Partnumber=295-486">Dayton Audio SD270A-88</a>. Low Fs, good xmax, good price and reliably sourced from PartsExpress. If that is the chosen woofer, the Linkwitz Transform Biquad will be as follows:<br />
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<b>Using Dayton SD270A-88 Sub </b><br />
(Credit to SVEN from DIYAudio for providing the measurements):<br />
<a href="https://lh6.googleusercontent.com/-aMR-wjZ6WYg/UIE3kBz8Q3I/AAAAAAAAIiI/NYKXoDB0EyQ/s720/W%2520LT%2520SD270.png">Image</a> - Linkwitz Transform for Dayton SD270A-88. <br />
<a href="https://lh4.googleusercontent.com/-YK4a3VGiYsc/UD13N_Lz5RI/AAAAAAAAISg/J1Ea7COmnbk/s822/SD270.png">Image</a> - Dayton SD270A-88 subwoofer FR modelling <br />
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Note: If you have other woofers in mind, please provide me with .frd nearfield measurement on the cabinet mouth and I will gladly publish the LT biquad parameters.<br />
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<b><span style="color: red;">Midbass & Tweeter Section</span></b><br />
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjf5834p0FmhVxyhyRZbC5LdHlIWFBa-fkJqsjZdbfcISqDWX4EmW-DLb_X2NPUN4F7x7yRrtQSf3e-kRofMRYyYS4N6iMeqjBZei8saXhdmTQVhKWKykka8070c-3TvSMU41IM27X7Ajw/s1600/MT+overall.png" imageanchor="1" style="clear: left; float: left; margin-bottom: 1em; margin-right: 1em;"><img border="0" height="71" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjf5834p0FmhVxyhyRZbC5LdHlIWFBa-fkJqsjZdbfcISqDWX4EmW-DLb_X2NPUN4F7x7yRrtQSf3e-kRofMRYyYS4N6iMeqjBZei8saXhdmTQVhKWKykka8070c-3TvSMU41IM27X7Ajw/s320/MT+overall.png" width="320" /></a></div>
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<a href="https://lh4.googleusercontent.com/-crzCaEDhbf8/UIE9uHFefCI/AAAAAAAAIi0/VLz_jkf4Gzc/s720/MT%2520XO.png">Image</a> - 120Hz LR4 Asymmetrical crossover<br />
<a href="https://lh3.googleusercontent.com/-RENxN9VTKBo/UIE9uGIVgfI/AAAAAAAAIi4/enGp_NmWI60/s720/MT%2520Notch.png">Image</a> - 650Hz/-4.2dB/1.4Q Notch for dipole peak EQ (<a href="https://lh4.googleusercontent.com/-HUIW9dIgAUU/UIE9tqQYUZI/AAAAAAAAIis/4XNjHn5cvoU/s800/MT%2520measured%2520notch.png">measured</a>)<br />
<a href="https://lh4.googleusercontent.com/-K1ImB0URqtg/UIE9vsfERPI/AAAAAAAAIjI/_NIOlLlfYJ4/s720/MT%2520slp.png">Image</a> - 6db/oct Shelving-Lowpass dipole rolloff EQ<br />
<a href="https://lh5.googleusercontent.com/-fdYv9r9mC8c/UIE9ueiaplI/AAAAAAAAIi8/xAKyTnJrYMw/s800/MT%2520measured%2520overall.png">Image</a> - Overall response of the panel. Note the dip at 3.8khz which needs to be investigated<br />
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Most critical of these settings is the 650Hz dipole notch. It is directly related to the front-rear separation and hence the baffle width. The final loudspeaker build had a baffle width of exactly 21.5cm. If your baffle is wider, the notch will be moved to lower frequency. The notch frequency can only be reliably measured outdoor/anaechoic conditions.<br />
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The crossover is 120hz asymmetrical to compensate floor reflections. This puts large demand on the 5" midbass. I play loud enough to fill in a 4.5m x 8m living room with no issues. But for extreme SPL, you may want to change it to 220Hz.<br />
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A null is observed at 3.8khz which deserve further investigation.<br />
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<b><span style="color: red;">Other Settings</span></b><br />
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEixtC_Z4bvw5M8lo9a1CZfrtp1gymgP2dJMIE__89jwfhjB1uT_pMBtzWiDb2IRNTelU1CvUjW2wqOJuGsLEOCjSIR7t7tXHXA09y2w1LkIyLxtGY1I9u0RnXyg6nZK_CxINjMBqFUshp4/s1600/Other+overall.png" imageanchor="1" style="clear: left; float: left; margin-bottom: 1em; margin-right: 1em;"><img border="0" height="71" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEixtC_Z4bvw5M8lo9a1CZfrtp1gymgP2dJMIE__89jwfhjB1uT_pMBtzWiDb2IRNTelU1CvUjW2wqOJuGsLEOCjSIR7t7tXHXA09y2w1LkIyLxtGY1I9u0RnXyg6nZK_CxINjMBqFUshp4/s320/Other+overall.png" width="320" /></a></div>
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<a href="https://lh3.googleusercontent.com/-eyWTjYXwAEs/UIFAArw3wYI/AAAAAAAAIjg/8QIqIiV6nOA/s720/Other%2520space%2520transition.png">Image</a> - 2π to 4π radiation space transition<br />
<a href="https://lh6.googleusercontent.com/-qTOTWgxLOOI/UIFAAcN3cfI/AAAAAAAAIjc/eZaNZQqnCRk/s720/Other%2520attenuation%2520delay.png">Image</a> - delay and attenuation<br />
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As with any other loudspeaker design, the top half of S20Z fires to full space (4π), while the bottom half fires to half-space (2π). This needs to be compensated accordingly using shelving highpass filter.<br />
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The combination of CW2139 and Zaph kit does not need further attenuation. With SD270A-88 above it might need minor tuning.<br />
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<span style="font-size: large;">Updates</span><br />
10/7/12 - Drivers shipped and on their way to down under !<br />
17/7/12 - Drivers <a href="http://www.htguide.com/forum/showpost.php4?p=556116&postcount=2">arrived</a>.<br />
29/7/12 - First dipole sub <a href="http://www.htguide.com/forum/showpost.php4?p=556733&postcount=28">built and measured</a>.<br />
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12/8/12 - Woodworking <a href="http://www.htguide.com/forum/showpost.php4?p=557320&postcount=35">completed</a>. The final design is actually smaller than planned.<br />
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEj_R9Al4Rvba7Ro6ggXSpuVWWwJZ3nkXYU3M1o3olO-G-qggXEyA6tQmGBn0S8VgbxyaLhfnktMe92Q0Ea4IeEghubzZGNTGc9E_8XR8RdWa5qNfH-uKzImyLogYAd7JqQ5Ou-cDdUzXEg/s1600/DSC_2312.jpg" imageanchor="1" style="clear: left; float: left; margin-bottom: 1em; margin-right: 1em;"><img border="0" height="132" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEj_R9Al4Rvba7Ro6ggXSpuVWWwJZ3nkXYU3M1o3olO-G-qggXEyA6tQmGBn0S8VgbxyaLhfnktMe92Q0Ea4IeEghubzZGNTGc9E_8XR8RdWa5qNfH-uKzImyLogYAd7JqQ5Ou-cDdUzXEg/s200/DSC_2312.jpg" width="200" /></a></div>
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15/8/12 - Preliminary crossover system and listening impressions <a href="http://www.htguide.com/forum/showpost.php4?p=557409&postcount=45">observed</a>.<br />
14/9/12 - Outdoor measurements <a href="http://www.htguide.com/forum/showpost.php4?p=559108&postcount=67">taken</a>.<br />
19/10/12 - Crossover configuration and measurements posted<br />
9/7/13 - Other narrow dipole sub possibilities: <a href="http://www.htguide.com/forum/showthread.php?40124-Ultra-compact-dipoles&p=559043&viewfull=1#post559043">Z Frame</a>, <a href="http://www.htguide.com/forum/showthread.php?40124-Ultra-compact-dipoles&p=560112&viewfull=1#post560112">Z Frame2</a>, <a href="http://www.htguide.com/forum/showthread.php?40124-Ultra-compact-dipoles&p=558771&viewfull=1#post558771">W-Frame</a>, <a href="http://www.htguide.com/forum/showthread.php?40124-Ultra-compact-dipoles&p=559964&viewfull=1#post559964">M-Frame</a><br />
10/7/13 - <a href="http://www.htguide.com/forum/showthread.php?40124-Ultra-compact-dipoles&p=563953&viewfull=1#post563953">wmcarpenter's adaption</a> using Zaph MTM kit and 4x Bipole woofers <br />
12/7/13 - <a href="http://www.diyaudio.com/forums/multi-way/238944-new-open-baffle-project-gainphile-s20z.html">danvprod's build</a> progress using Markaudio fullrange driver<br />
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Unknownnoreply@blogger.com22tag:blogger.com,1999:blog-6998112391780171236.post-16308707305218824252012-05-23T03:24:00.000-07:002015-07-27T22:04:05.354-07:00Audio-Technica ATH-AD700 Correction Circuit<div dir="ltr" style="text-align: left;" trbidi="on">
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgFb81noTPyMjzC0GVLh_szLvRJnkP3BLsvZRvXI_xoT76dinQkmRNvBsluTmZNR2Rkcf7ef_wwPW2la5xKm7HRh07Hlm2lzuTK_-qVCNq0pkQaaWlJeT89-UmRo0YPQKEE79sJp5x2Ks4/s1600/DSC_1314s.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="325" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgFb81noTPyMjzC0GVLh_szLvRJnkP3BLsvZRvXI_xoT76dinQkmRNvBsluTmZNR2Rkcf7ef_wwPW2la5xKm7HRh07Hlm2lzuTK_-qVCNq0pkQaaWlJeT89-UmRo0YPQKEE79sJp5x2Ks4/s400/DSC_1314s.jpg" width="400" /></a></div>
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These are mid-priced (~$150) "Open-Air" headphones which have strong following among head-fi enthusiasts. Among the general consensus are high-resolution, airy and transparent sound. I heard them first when JP Howard brought them to my house a few years ago and was immediately impressed.<br />
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I guess being open-aired they do not have to deal with back pressure from the typical cups, and for me the appeal is dipole-like neutrality. There is less fatique because the ears would not be pressurised by the bass too much. The disadvantage is, of course, other people will hear the songs you are playing!<br />
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Upon hearing the headphones after their arrival, I noticed they sound too bright for my liking. Hence I measured them as per above photo.<br />
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From the impulse response we can see that the headphones exhibit strong resonances at 5khz and 10khz with a rising trend to the frequency response. This explains the bright sound of the headphones.<br />
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhpHRlbaK1vW2k_9P-q9R2FRIgVIgJ4Vprg9VFIGQpBsqYw7ProrS_V3u9JqkVMgx_csJ_JjQzsgIECQFsmA5qFsBFHfBuXXtEF6ACTWLQNeOK6Z-n4QhBTff_Hp-0MbRjYp7DA36SINuw/s1600/ATH-AD700+Impulse+Nearfield.png" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="251" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhpHRlbaK1vW2k_9P-q9R2FRIgVIgJ4Vprg9VFIGQpBsqYw7ProrS_V3u9JqkVMgx_csJ_JjQzsgIECQFsmA5qFsBFHfBuXXtEF6ACTWLQNeOK6Z-n4QhBTff_Hp-0MbRjYp7DA36SINuw/s320/ATH-AD700+Impulse+Nearfield.png" width="320" /></a></div>
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<span style="font-size: x-small;">Raw nearfield measurement of ATH-AD700</span></div>
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Although looking non-flat, these are actually typical response for headphones. They are basically 2" fullrange transducers and would experience breakup at some point. Compare with Stereophile's measurements of AKG K530, Audio-Technica ATH-AD700, Beyerdynamic DT440, and Grado SR80 <a href="http://api.viglink.com/api/click?format=go&key=04fea777994d26cd84e01a5e54f4c01d&loc=http%3A%2F%2Fwww.head-fi.org%2Ft%2F611460%2Fmeasurements-of-audio-technica-ath-ad700&v=1&libid=1337909432143&out=http%3A%2F%2Fwww.stereophile.com%2Fcontent%2Fbetween-ears-art-and-science-measuring-headphones-page-3&ref=http%3A%2F%2Fwww.head-fi.org%2Ff%2F4%2Fheadphones-full-size&title=Measurements%20of%20Audio-Technica%20ATH-AD700&txt=http%3A%2F%2Fwww.stereophile.com%2Fcontent%2Fbetween-ears-art-and-science-measuring-headphones-page-3&jsonp=vglnk_jsonp_13379100062802">here</a>.</div>
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The response can be improved by utilising passive EQ consisting of 1.56mH inductor. Effectively a 1st order lowpass filter with corner frequency of ~5khz.</div>
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjiNqDZoX_Ka6RWlOckkENWoFa5WEpCX2uMUQA1N_bO_V8z8bXhk0tHJrjx1tPN-SObN9lkKmTiIh5CCkXGoZsT83F4Rxz4FE_y3KBIwgcZPgUo7PvBzNiFAAdeB6ZcFjzGu0lCydDN94Q/s1600/Audio+Techica+ATH-AD700+Passive+EQ.png" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="238" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjiNqDZoX_Ka6RWlOckkENWoFa5WEpCX2uMUQA1N_bO_V8z8bXhk0tHJrjx1tPN-SObN9lkKmTiIh5CCkXGoZsT83F4Rxz4FE_y3KBIwgcZPgUo7PvBzNiFAAdeB6ZcFjzGu0lCydDN94Q/s400/Audio+Techica+ATH-AD700+Passive+EQ.png" width="400" /></a></div>
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<span style="font-size: x-small;">Schematic diagram of ATH-AD700 Passive EQ.</span></div>
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<span style="font-size: x-small;">The parts can be obtained from Jaycar in Australia, or any other electronics shops.<br />note: you can also use single 1.5mH inductor from <a href="http://api.viglink.com/api/click?format=go&key=416b0e142670ceb8f9f66a8c84ef71c1&loc=http%3A%2F%2Fwww.stereo.net.au%2Fforums%2Findex.php%3F%2Ftopic%2F42202-audio-technica-ath-ad700-eq%2F&v=1&libid=1339576654975&out=http%3A%2F%2Fwww.soundlabsgroup.com.au%2Fp%2FMU-AC1m5-1mm%2F1.5mH%2B-%2B0.62%2BOhm%2B1mm%2BCopper%2BAir%2BCore%2BCoil&ref=http%3A%2F%2Fwww.stereo.net.au%2Fforums%2Findex.php%3Fapp%3Dcore%26module%3Dsearch%26do%3DviewNewContent%26period%3Dtoday%26userMode%3D%26search_app%3Dforums%26sid%3Dff4a794695bf1723471e5f1b276d9d1a%26st%3D50&title=Audio-Technica%20ATH-AD700%20EQ%20-%20Headphones%20%26%20Headphone%20Amps%20-%20StereoNET%20Australia&txt=http%3A%2F%2Fwww.soundlabs...r%20Air%20Core%20Coil&jsonp=vglnk_jsonp_13395766523741">SoundLabsGroup</a>.</span></div>
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEj4BLvTnNOFog-EAQxS04BNntXnFKOfuv4zf91DfZ3bHfDp3F2HcsDi7hS_r-BspIqrnn-WRyEaxG5LyXh3iaICL3nCOrOtIgywvqajXsT0LXEyOvCyrYSLTOoZOL8WT17L-7X993cOpdg/s1600/DSC_1386.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="212" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEj4BLvTnNOFog-EAQxS04BNntXnFKOfuv4zf91DfZ3bHfDp3F2HcsDi7hS_r-BspIqrnn-WRyEaxG5LyXh3iaICL3nCOrOtIgywvqajXsT0LXEyOvCyrYSLTOoZOL8WT17L-7X993cOpdg/s320/DSC_1386.jpg" width="320" /></a></div>
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<span style="font-size: x-small;">Finished Passive EQ</span></div>
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhJguzqHn5Gyu-48c5Jad6c_bDFxguAkOzDORQl3bNi5TWfx1O_6x45xbUlypuJSd5vPy16S3zMKNhF0tspYgAixVPZTZtRZV-e5D2IpyR39iWyhxVFo76ex1Mr64DNuuXkVzlnXoJhDYA/s1600/Raw+vs+1mH+056mH.png" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="228" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhJguzqHn5Gyu-48c5Jad6c_bDFxguAkOzDORQl3bNi5TWfx1O_6x45xbUlypuJSd5vPy16S3zMKNhF0tspYgAixVPZTZtRZV-e5D2IpyR39iWyhxVFo76ex1Mr64DNuuXkVzlnXoJhDYA/s320/Raw+vs+1mH+056mH.png" width="320" /></a></div>
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<span style="font-size: x-small;">Measured acoustic output of ATH-AD700 when equalised with Passive EQ.<br />There is very little noticeable loss as higher gauge inductors (0.8mm/20AWG) are used.</span></div>
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Perceptually the headphones now sounds very natural. </div>
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Of course as with all headphones they still exhibit high <a href="http://www.linkwitzlab.com/frontiers_6.htm#X -">spatial distortion</a>. That is ... the sound seems to emanate from inside the head. So they are not a true replacement for <a href="http://gainphile.blogspot.com/2012/03/s19-4-way-dipole-radiator.html">proper loudspeakers</a>.</div>
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Discussions on this EQ are in <a href="http://www.head-fi.org/t/611460/measurements-of-audio-technica-ath-ad700">HeadFi</a> and <a href="http://www.stereo.net.au/forums/index.php?/topic/42202-audio-technica-ath-ad700-eq/">SNA</a>.<br />
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<b>Other measurements of interests:</b></div>
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjkFcRhEF_eBjIZFDbeKoEmc2th0P39Z-b8xzuOli3ME41xiM6r2BGIxoz7EFiurz1oo4sLPW6jlzGu0k7QfWZ68Q3Khe7B54L91r211JXrF0NpHHtEgeWaYr8KNoYT3enjvKn61lPAWBA/s1600/ATH-AD700+Distortion.png" imageanchor="1" style="clear: left; float: left; margin-bottom: 1em; margin-right: 1em;"><img border="0" height="233" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjkFcRhEF_eBjIZFDbeKoEmc2th0P39Z-b8xzuOli3ME41xiM6r2BGIxoz7EFiurz1oo4sLPW6jlzGu0k7QfWZ68Q3Khe7B54L91r211JXrF0NpHHtEgeWaYr8KNoYT3enjvKn61lPAWBA/s320/ATH-AD700+Distortion.png" width="320" /></a></div>
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<span style="font-size: x-small;">2nd, 3rd, and 4th Harmonic distortions</span></div>
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEg4jlbD-2bS0AwcAfO7G319wLaXmbA7TO-o95xWKjNRKLAxZ0RGysgkNMil0GwLi5viVxjHkRFRjNBsKicYMu5Rhuj7Drr-zXCD7zctugVQ8PtBBc7qJ5uf1DwuhGHoefeSMmoumFMLE14/s1600/Burst-F.png" imageanchor="1" style="clear: left; float: left; margin-bottom: 1em; margin-right: 1em;"><img border="0" height="200" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEg4jlbD-2bS0AwcAfO7G319wLaXmbA7TO-o95xWKjNRKLAxZ0RGysgkNMil0GwLi5viVxjHkRFRjNBsKicYMu5Rhuj7Drr-zXCD7zctugVQ8PtBBc7qJ5uf1DwuhGHoefeSMmoumFMLE14/s320/Burst-F.png" width="320" /></a></div>
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<span style="font-size: x-small;">Burst response</span></div>
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<b><span style="color: #990000;">ARCHIVES</span></b></div>
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<b>Below DSP eq was Archived on 29/5/12.</b></div>
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Passive EQ above is preferred due to its simplicity.</div>
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These can be improved by applying two notch filters. I do not have separate headphone amplifier on-hand so the equalization process utilised external pink noise. Not ideal, but close. I would revisit this later on.</div>
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EQ1: fo = 47780hz, Q = 1.86, Gain = -2.2dB</div>
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EQ2: fo = 11,669hz, Q = 1.10, Gain = -8.2dB</div>
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhbrOmG-7bmiAsOIEYh9uUNIHVomkVqtm_6rYn3Budc0O28eqtNmLwbt7YpaMzd4pR0XGeoig__NV4lxTnS9iaTcjiLl1ZuBTagFHJSsjvxyd8eVT0nSVwlT1dmIJWPcfsadtvwhw3Ws_0/s1600/ATH-AD700+EQ.png" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="223" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhbrOmG-7bmiAsOIEYh9uUNIHVomkVqtm_6rYn3Budc0O28eqtNmLwbt7YpaMzd4pR0XGeoig__NV4lxTnS9iaTcjiLl1ZuBTagFHJSsjvxyd8eVT0nSVwlT1dmIJWPcfsadtvwhw3Ws_0/s320/ATH-AD700+EQ.png" width="320" /></a></div>
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<span style="font-size: x-small;">Pink noise measurement of ATH-AD700<br />Blue = Before EQ, Black = After EQ</span></div>
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I use Foobar2000 VST Plugin and TDAe EQ2004P parametric equalizer to prototype the notches.</div>
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgL9dRWY2SkE6CX9SSEbNNk_0L5kAfeHWT8cdR7XFBpLRlH3FU4w1d3eb9s0wTeSihSrBm08_iN-eGf1b1ArGZfn3IMezu5YgzKJUCrezAm2YFgCvspm7B7B3aB5tOqhnz1U7UMqhZIDPI/s1600/VST+Settings+v01.png" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="55" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgL9dRWY2SkE6CX9SSEbNNk_0L5kAfeHWT8cdR7XFBpLRlH3FU4w1d3eb9s0wTeSihSrBm08_iN-eGf1b1ArGZfn3IMezu5YgzKJUCrezAm2YFgCvspm7B7B3aB5tOqhnz1U7UMqhZIDPI/s400/VST+Settings+v01.png" width="400" /></a></div>
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Unknownnoreply@blogger.com9tag:blogger.com,1999:blog-6998112391780171236.post-23334963420610388472012-04-06T01:52:00.000-07:002013-08-14T20:16:35.170-07:00Investigations<div dir="ltr" style="text-align: left;" trbidi="on">
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<b><span style="color: red;">Application of DSS filter for single-tweeter Dipoles</span></b><br />
The imbalances with single firing tweeter is due to different radiation between front and back. And normally the tweeter levels are adjusted by ear to correct it to a certain degree (e.g. Linkwitzlab Phoenix). But what if instead changing tweeter levels we use the DSS filter ?</div>
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<a href="http://www.diyaudio.com/forums/multi-way/214434-application-dss-filter-single-tweeter-dipoles.html">Read more >></a><br />
(14/6/12)<br />
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<b><span style="color: red;">Class D for Tweeters?</span></b><br />
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhUbLjy1yKiCnmdptPcb74XkKGES6BeBDm8Nosalp2bhlQB7jtxq-U3fFbsqaoG8TyK5_x6BX1kCXW_c1jUkbSr37K_aQnSfY-fchTyEP0aTEWNTeJtmvnM76kCg6ZVxd7fPWBPQeUv3qk/s1600/amps.png" imageanchor="1" style="clear: left; float: left; margin-bottom: 1em; margin-right: 1em;"><img border="0" height="111" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhUbLjy1yKiCnmdptPcb74XkKGES6BeBDm8Nosalp2bhlQB7jtxq-U3fFbsqaoG8TyK5_x6BX1kCXW_c1jUkbSr37K_aQnSfY-fchTyEP0aTEWNTeJtmvnM76kCg6ZVxd7fPWBPQeUv3qk/s200/amps.png" width="200" /></a><br />
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Class D amplifiers have been known to be superior option for Bass and Midrange duties due to their efficiencies and damping factor. But what about for Tweeters?<br />
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I measured ClassD and Gainclone amplfiers at the *acoustic output* (loudspeakers), instead of amplifiers. I conclude that Class D is at least as good as Gainclones/Class AB. The distortions of both types of amplifiers are insignificant compared to loudspeaker/transducer distortions. Please download the .pdf <a href="http://api.viglink.com/api/click?format=go&key=416b0e142670ceb8f9f66a8c84ef71c1&loc=http%3A%2F%2Fwww.stereo.net.au%2Fforums%2Findex.php%3F%2Ftopic%2F32382-advance-in-class-d-amps%2Fpage__st__315&v=1&libid=1333788423696&out=http%3A%2F%2Fwww.scribd.com%2Fdoc%2F88347917%2FClassD-vs-Gainclone-amplifiers&ref=http%3A%2F%2Fwww.stereo.net.au%2Fforums%2Findex.php%3Fapp%3Dcore%26module%3Dsearch%26do%3DviewNewContent&title=Advance%20in%20Class%20D%20amps%3F%20-%20StereoNET%20Australia%20-%20Page%208&txt=http%3A%2F%2Fwww.scribd.co...lone-amplifiers&jsonp=vglnk_jsonp_13337890989202">here</a>, or follow my discussions in SNA <a href="http://www.stereo.net.au/forums/index.php?/topic/32382-advance-in-class-d-amps/page__view__findpost__p__684230">here</a> and <a href="http://www.stereo.net.au/forums/index.php?/topic/32382-advance-in-class-d-amps/page__view__findpost__p__684526">here</a>. (<span style="text-align: left;">7/4/2012)</span></div>
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<span style="text-align: left;"><b style="text-align: -webkit-auto;"><span style="color: red;">Compression Driver showdown: B&C DE250 vs. Selenium D220Ti</span></b></span><br />
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhq5-RlOlcvCsT1N1d4JafYpxcvy1_MCnnw_2SP_un-XDiCGMoihngq0ErRfE919pFxrp4Z7R6S6VS7hrSMhvaHTVObxwCZPiX-Wm5m0IbaKJ8Ufcf07cXHg3Xdw-efQKepXkpvhESC5sc/s1600/CD+Test.png" imageanchor="1" style="clear: left; float: left; margin-bottom: 1em; margin-right: 1em;"><img border="0" height="86" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhq5-RlOlcvCsT1N1d4JafYpxcvy1_MCnnw_2SP_un-XDiCGMoihngq0ErRfE919pFxrp4Z7R6S6VS7hrSMhvaHTVObxwCZPiX-Wm5m0IbaKJ8Ufcf07cXHg3Xdw-efQKepXkpvhESC5sc/s200/CD+Test.png" width="200" /></a></div>
<span style="text-align: left;">Arguably the two most popular drivers for controlled-directivity DIYers. D220Ti is the darling of Econowave, and DE250 is used extensively in Gedlee Speakers. But which one is better? </span><br />
<span style="text-align: left;">Read .pdf <a href="http://www.scribd.com/doc/90342053/D220Ti-vs-DE250">here</a> and summary/discussions <a href="http://www.diyaudio.com/forums/multi-way/189649-d220ti-vs-de250-tone-burst-showdown.html">here</a>. </span><span style="text-align: left;">(26/5/2011)</span><br />
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<span style="color: red; text-align: left;"><b>Effects of Crossover Points on Loudspeaker Directivity</b></span><br />
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgA8PdMq89XSlStNBqedWR5cXYWgz-nZ7tTGeibwFrOPtTkwEeteWKbUy0R055BmSwTCIluVbTUksvPCKabzKm0PAFLqJdFRNd19kZ1BG5Cww-k5kGL38OKqyIJRLaEt2iVmI3aC5Od-9E/s1600/dXHUM.png" imageanchor="1" style="clear: left; float: left; margin-bottom: 1em; margin-right: 1em;"><img border="0" height="104" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgA8PdMq89XSlStNBqedWR5cXYWgz-nZ7tTGeibwFrOPtTkwEeteWKbUy0R055BmSwTCIluVbTUksvPCKabzKm0PAFLqJdFRNd19kZ1BG5Cww-k5kGL38OKqyIJRLaEt2iVmI3aC5Od-9E/s200/dXHUM.png" width="200" /></a></div>
Crossover points needs to be chosen accurately for seamless integration of driver directivity. Here are examples of Econowave loudspeakers crossed at 2.5khz, 1.5khz, and 1khz. Read <a href="http://www.stereo.net.au/forums/index.php?/topic/26314-econowave-looking-for-a-tube-friendly-dynamic-speaker/page-7#entry514222">here</a>.<br />
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<span style="color: red; text-align: left;"><b>Constant-directivity vs. Dipole Loudspeakers</b></span><br />
<span style="text-align: left;">Which is the better transducer ?</span><br />
<span style="text-align: left;"><a href="http://www.diyaudio.com/forums/multi-way/179800-s15-econowave-dsp-constant-directivity-vs-dipole-study-14.html#post2511045">Read more >></a></span><br />
<span style="text-align: left;">(21/4/2011)</span><br />
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Unknownnoreply@blogger.com0tag:blogger.com,1999:blog-6998112391780171236.post-17259203838498629862012-03-05T02:45:00.000-08:002015-07-21T06:29:09.377-07:00S19 4-Way Dipole Radiator<div dir="ltr" style="text-align: left;" trbidi="on">
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjAgHoGjQ3U5otfj_ItvcmsSgCYUJUaca5VTX0xEjgBarLvBUA_CQnnyCSNhs-aKCa8s3Z4PcMqmYs2d8SJE7ShoBv70S8x3vmpn8J_fVAzrROramW2sfKaAELPfaGi8JK0AS6igs-un-A/s1600/DSC_2595.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="321" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjAgHoGjQ3U5otfj_ItvcmsSgCYUJUaca5VTX0xEjgBarLvBUA_CQnnyCSNhs-aKCa8s3Z4PcMqmYs2d8SJE7ShoBv70S8x3vmpn8J_fVAzrROramW2sfKaAELPfaGi8JK0AS6igs-un-A/s400/DSC_2595.jpg" width="400" /></a></div>
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S19 dipole-radiating speakers<br />
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The quality of dipole loudspeaker accuracy is improved by using a small 5" midrange driver from 400hz to 2khz. The tradeoffs are higher complexity and more difficult design process to take account of polar response changes.<br />
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<a href="http://1.bp.blogspot.com/-CMkWnImD8rs/UEGBRtrRSxI/AAAAAAAAITY/n_GNlEeFY5Y/s1600/DSC_2576.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="212" src="http://1.bp.blogspot.com/-CMkWnImD8rs/UEGBRtrRSxI/AAAAAAAAITY/n_GNlEeFY5Y/s320/DSC_2576.jpg" width="320" /></a></div>
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Push-pull dipole subwoofer section</div>
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The dipole subwoofers are w-frame to benefit from vibration cancellation. They are long-throw Dayton RSS256HF-8. The woofers are Seas Excel W22EX001 and W15CH001, and the Tweeters are Seas DXT.<br />
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The w-frame sub's cancellation topology really works. It's quite mesmerising to see the drivers pumping air furiously yet there is no cabinet vibrations. Seen below is how clean they are crossed at 120hz. The subs are -3db at 20hz.<br />
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<a href="http://1.bp.blogspot.com/-1ZKvSpQqhpE/UEIYCM_pcEI/AAAAAAAAIVE/amsC0MQny0E/s1600/RSS265+120hz.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="127" src="http://1.bp.blogspot.com/-1ZKvSpQqhpE/UEIYCM_pcEI/AAAAAAAAIVE/amsC0MQny0E/s200/RSS265+120hz.jpg" width="200" /></a><a href="http://3.bp.blogspot.com/-zCflLD5bo1s/UEIYByNzdAI/AAAAAAAAIVA/o0l3zEJ9jbI/s1600/RSS265+120hz+sono.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="126" src="http://3.bp.blogspot.com/-zCflLD5bo1s/UEIYByNzdAI/AAAAAAAAIVA/o0l3zEJ9jbI/s200/RSS265+120hz+sono.jpg" width="200" /></a></div>
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Please follow the build progress at <a href="http://www.htguide.com/forum/showthread.php4?t=36626&page=99">HTGuide Forum</a>.<br />
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<span style="background-color: white; color: #ff6600; font-weight: bold;"><span style="font-family: inherit;">Specifications</span></span><br />
Topology: Active 4-way<br />
Radiation pattern: Dipole<br />
Directivity: Dipole from 20hz - 2khz then forward-directional<br />
Frequency response: 20hz - 20khz.<br />
Sensititivity: ~88dB<br />
Dimension (H, W, D): 117 x 31 x 31 (cm)<br />
Amplifiers: 8-Channels required (4x stereo amps) <br />
Crossover: Two 2x4 MiniDSP<br />
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Update 12/3/12<br />
Outdoor measurements of early prototype to investigate the frequency response of small midrange.<br />
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiUeI1F1__7wP-JCWU0yxidxWKC-CYh0GD19pUQGML53-o-KtD86CuY7IOzXXuqiSk4fo5ymiWXdZMRsNYzqFPQPAaG8HyUzrHVODBu347npVtTXeOHg5MujmKcnBwr6FXJOamzhljMSCo/s1600/IMGP3490.jpg" imageanchor="1" style="clear: left; float: left; margin-bottom: 1em; margin-right: 1em; text-align: center;"><img border="0" height="150" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiUeI1F1__7wP-JCWU0yxidxWKC-CYh0GD19pUQGML53-o-KtD86CuY7IOzXXuqiSk4fo5ymiWXdZMRsNYzqFPQPAaG8HyUzrHVODBu347npVtTXeOHg5MujmKcnBwr6FXJOamzhljMSCo/s200/IMGP3490.jpg" width="200" /></a></div>
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Update 25/3/12 - Seas Excel W15CH001 received and tested<br />
Update 2/4/12 - First prototype of S19M (magnesium)<br />
Update 20/4/12 - S19/MT - Titanium dome Tweeters (Vifa DQ25) used for improved resolution.<br />
Update 31/8/12 - Started the final design of the cabinet and wood choices<br />
Update 2/9/12 - Cabinets completed<br />
Update 23/1/13 - I have been living for quite a while with these speakers. I havent' had any desires to build something new ! <br />
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Update 28/6/13 - Frequency response in the critical 1khz-20khz region showing ±1db (XT25)<br />
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEh8F4yTrQb6D51JClg-0N7uAY3aza8o2xtxs_Q9FrZOcveddCt7_oFYDPh5ZDaAc0smbBTxj9PlnCYcqdz__IKTSlrJfDmwy7AXPU0AwmEgu63tPxPIWLdgaMuBPeC8opJHkxXJ81im-oI/s656/s19.png" imageanchor="1" style="clear: left; float: left; margin-bottom: 1em; margin-right: 1em;"><img border="0" height="126" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEh8F4yTrQb6D51JClg-0N7uAY3aza8o2xtxs_Q9FrZOcveddCt7_oFYDPh5ZDaAc0smbBTxj9PlnCYcqdz__IKTSlrJfDmwy7AXPU0AwmEgu63tPxPIWLdgaMuBPeC8opJHkxXJ81im-oI/s200/s19.png" width="200" /></a></div>
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Update 13/9/13 - The 4x Dayton Reference subs requires <a href="http://www.stereo.net.au/forums/index.php?/topic/55051-2x-500w-class-d-subwoofer-amps/?p=946163">large power</a> to drive them to xmax.<br />
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Update 21/7/15 - Amateur <a href="http://youtu.be/OPtOr09K4ro">video of S19</a><br />
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Unknownnoreply@blogger.com29tag:blogger.com,1999:blog-6998112391780171236.post-34988576749111561272011-10-24T17:49:00.001-07:002023-12-26T16:54:07.879-08:00What's New<div dir="ltr" style="text-align: left;" trbidi="on">27/12/2024 - Site visits 987,432! yes I am still alive lol<br /><br />17/3/2021 - Nothing new. The few Covid lockdowns had me thinking for some new ideas but none really eventuates. Listens to my S19 occassionally and loving it still. But most spare time I have now is doing outdoor stuff - camping, motorbike riding, 4wd :)</div><div dir="ltr" style="text-align: left;" trbidi="on"><br /></div><div dir="ltr" style="text-align: left;" trbidi="on">27/9/2015 - PSE-144 <a href="http://gainphile.blogspot.com/2011/02/visits-and-gtgs.html">GTG</a><br />
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14/9/2015 - Princeton University 3D3A posted results of <a href="http://www.princeton.edu/3D3A/Directivity/Gainphile%20R16/DI3.html">R16 measurements</a><br />
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2/9/2015 - Redefy TWO <a href="http://gainphile.blogspot.com/2011/02/visits-and-gtgs.html">GTG</a><br />
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21/7/2015 - Amateur <a href="http://youtu.be/OPtOr09K4ro">video of S19</a><br />
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5/6/2015 - 500,000+ visits! Wow thanks and hopefully this site is useful for you.<br />
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8/2/2014 - Walking around a dipole loudspeaker (<a href="http://youtu.be/SWaT_zMaBik">YouTube Video</a>)<br />
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26/1/2015 - First photos of <a href="http://gainphile.blogspot.com.au/2015/01/r16-constant-directivity-loudspeakers.html">R16</a> posted<br />
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7/9/2014 - Posted polar measurements of <a href="http://gainphile.blogspot.com/2014/07/s23-active-cardioid-loudspeakers.html">S23</a><br />
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31/8/2014 - Posted design of <a href="http://gainphile.blogspot.com/2014/07/s23-active-cardioid-loudspeakers.html">Cardioid loudspeaker project: S23</a><br />
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29/5/14 - Added <a href="http://gainphile.blogspot.co.uk/2014/05/epiphone-les-paul.html">Epiphone Les Paul guitar page</a><br />
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14/5/14 - Site visitors passed 400,000<br />
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18/10/13 - Melbourne Audio Show in <a href="http://gainphile.blogspot.com/2011/02/visits-and-gtgs.html">GTG</a><br />
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15/8/13 - <a href="http://gainphile.blogspot.com.au/2012/04/investigations.html">Investigation</a>: Effects of Crossover Points on Loudspeaker Directivity<br />
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14/8/13 - Building a <a href="http://www.stereo.net.au/forums/index.php?/topic/55051-2x-500w-class-d-subwoofer-amps/">2x 500w Class-D Subwoofer Amplifiers</a><br />
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20/7/13 - Added another 4 channels to the <a href="http://www.diyaudio.com/forums/chip-amps/211843-8-channel-gainclone-amplifier-3.html#post3567692">8-Channel Gainclone amp</a>. The channels are bridged<br />
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14/5/13 - Site visitors passed 300,000<br />
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22/1/13 - Red Spade S3 Synergy Horn measurement <a href="http://gainphile.blogspot.com/2011/02/visits-and-gtgs.html">GTG</a><br />
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7/12/12 - Weekday <a href="http://gainphile.blogspot.com/2011/02/visits-and-gtgs.html">GTG</a><br />
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8/11/12 - Posted <a href="http://gainphile.blogspot.com.au/2012/11/ep21-single-stereo-loudspeakers.html">EP12</a>, Single Stereo Loudspeaker<br />
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20/10/12 - Posted full details of <a href="http://gainphile.blogspot.com.au/2012/06/s20-z-compact-open-baffle-using-zaph.html">S20-Z</a>. Config file is available for purchase<br />
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19/9/12 - Requirements for <a href="http://gainphile.blogspot.com/2012/09/upside-down-down-firing-woofer.html">upside down / down firing subwoofer</a><br />
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14/9/12 - Updated stuffing information of <a href="http://gainphile.blogspot.com/2010/11/s15-econowave-dsp.html">S15</a> based on builder inputs<br />
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2/9/12 - Completed final cabinet for <a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiKOmNensZddsvfzh4-2w9uu_rPyUUKsyDqOpu6xNEtkU2RaFTp_5HEenN-BdUpsryTSUPO4kSoU51945D3TN8cZ7A8VDtcnKuHHHyAKjqn49khVcpGQF2hIwuySRgYfux-tFuhJ_9j29g/s150/DSC_2595.jpg">S19 4-way dipole radiator</a><br />
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28/8/12 - Random notes of <a href="http://gainphile.blogspot.com/2012/08/work-in-progress.html">work in progress</a><br />
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28/8/12 - Updated where to buy measurement microphone in <a href="http://gainphile.blogspot.com/2008/11/cheap-and-accurate-speaker-measurement.html">speaker measurement tool</a><br />
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27/8/12 - Site visit 200,000<br />
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29/6/12 - Posted <a href="http://gainphile.blogspot.com.au/2012/06/s20-z-compact-open-baffle-using-zaph.html">S20-Z</a> design concept<br />
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27/6/12 - Musikelectronic Geithain 901K speakers <span style="background-color: white;">in </span><a href="http://gainphile.blogspot.com/2011/02/visits-and-gtgs.html" style="background-color: white;">Visits and GTGs</a><br />
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14/6/12 - <a href="http://gainphile.blogspot.com.au/2012/04/investigations.html">Investigation</a>: Application of DSS filter for single-tweeter Dipoles<br />
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6/6/12 - LINN high end GTG in <a href="http://gainphile.blogspot.com/2011/02/visits-and-gtgs.html">Visits and GTGs</a><br />
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29/5/12 - Updated Audio-Technica ATH-AD700 with <a href="http://gainphile.blogspot.com.au/2012/05/audio-technica-ath-ad700-correction-eq.html"> Passive Equalizer</a><br />
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24/5/12 - Audio-Technica ATH-AD700 <a href="http://gainphile.blogspot.com.au/2012/05/audio-technica-ath-ad700-correction-eq.html">Frequency Response Equalizer</a><br />
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8/5/12 - Project: <a href="http://www.diyaudio.com/forums/chip-amps/211843-8-channel-gainclone-amplifier.html">8-Channel Gainclone amplifier</a><br />
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7/4/12 - Added <a href="http://gainphile.blogspot.com/2012/04/investigations.html">Investigations</a> section and posted "Class D Amplifiers for Tweeters"<br />
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2/4/12 - First prototype of 4-way dipoles with <a href="http://gainphile.blogspot.com.au/2012/03/s19-4-way-dipole-radiator.html">Seas Magnesium drivers</a><br />
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25/3/12 - Seas W15CH001 <a href="http://gainphile.blogspot.com.au/2012/03/s19-4-way-dipole-radiator.html">received and tested</a><br />
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21/3/12 - Published 35hz LT version of <a href="http://gainphile.blogspot.com/2010/11/s15-econowave-dsp.html">S15</a><br />
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6/3/12 - Initial publication of <a href="http://gainphile.blogspot.com.au/2012/03/s19-4-way-dipole-radiator.html">S19</a> 4-way dipole loudspeakers<br />
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6/2/12 - Experimentation with Linkwitzlab <a href="http://linkwitzlab.com/Watson/watson.htm">Watson</a> with <a href="http://gainphile.blogspot.com/2010/12/s16-constant-directivity-dipoles.html">S16/MSXT</a><br />
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4/2/12 - <a href="http://gainphile.blogspot.com/2010/11/s15-econowave-dsp.html">S15</a> : B&C DE250 andCelestion CDX1-1745 variants posted<br />
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3/2/12 - Production version of original <a href="http://gainphile.blogspot.com/2010/11/s15-econowave-dsp.html">S15</a> documented and posted. Visitors can also purchase the config file. <br />
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18/1/12 - Design of the rounded waveguide loudspeaker: <a href="http://gainphile.blogspot.com/2010/11/s15-econowave-dsp.html">S15R</a><br />
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1/12/11 - Update on S16 variant using Titanium tweeters DQ25SC16: <a href="http://gainphile.blogspot.com/2010/12/s16-constant-directivity-dipoles.html">S16/MSTi</a> <br />
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18/12/11 - Waveguide and Celestion compression driver GTG in <a href="http://gainphile.blogspot.com/2011/02/visits-and-gtgs.html">Visits
and GTGs</a><br />
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1/12/11 - Posted basic measurement data for recently built <a href="http://gainphile.blogspot.com/2010/12/s16-constant-directivity-dipoles.html">S16/MSXT</a><br />
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27/11/11 Melbourne audio <a href="http://gainphile.blogspot.com/2011/02/visits-and-gtgs.html">round-trip GTG</a>. Also <a href="http://www.stereo.net.au/forums/showthread.php/38240-GTG-Melbourne-audio-round-trip-%28November%29?p=621636&viewfull=1#post621636">report at SNA</a>.<br />
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18/11/11 - Major cleanup and progress on the <a href="http://gainphile.blogspot.com/2011/06/gaincave.html">Garage Audio Room</a><br />
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6/11/11 - Synergy Horn <a href="http://gainphile.blogspot.com/2011/02/visits-and-gtgs.html">GTG</a><br />
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1/11/11 - Completed <a href="http://gainphile.blogspot.com/2010/12/s16-constant-directivity-dipoles.html">S16/MS</a><br />
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31/10/11 - Site visits passed 100,000<br />
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30/10/11 - Building <a href="http://gainphile.blogspot.com/2010/12/s16-constant-directivity-dipoles.html">S16/MS</a><br />
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26/10/2011 - Added report of "The Australian Audio and AV Show" <a href="http://gainphile.blogspot.com/2011/02/visits-and-gtgs.html">Visits and GTGs</a><br />
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25/10/2011 - What's New page created</div>
Unknownnoreply@blogger.com0tag:blogger.com,1999:blog-6998112391780171236.post-54786722705438563582011-06-13T17:34:00.001-07:002011-11-23T22:10:09.119-08:00Garage Audio Room, the "Gaincave"<div style="text-align: center;"><span style="font-weight: bold; color: rgb(255, 102, 0);font-size:130%;" >Before (13 June 2011)</span><br /><br /><a onblur="try {parent.deselectBloggerImageGracefully();} catch(e) {}" href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjXBvLRWvJAANvBXEggtHgC5_FCddX-qRgyxM8SlDKPGvCgnkqAf7i3AeucD2yRBobq3uyiAWgDpPGV5MzMPQmFqIZAvSbsMJL30kRRbOyi5jA0aCSfO-8ciIg4ZFc74e68T0Rq79mcRDY/s1600/DSC_6822.jpg"><img style="display: block; margin: 0px auto 10px; text-align: center; cursor: pointer; width: 400px; height: 266px;" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjXBvLRWvJAANvBXEggtHgC5_FCddX-qRgyxM8SlDKPGvCgnkqAf7i3AeucD2yRBobq3uyiAWgDpPGV5MzMPQmFqIZAvSbsMJL30kRRbOyi5jA0aCSfO-8ciIg4ZFc74e68T0Rq79mcRDY/s400/DSC_6822.jpg" alt="" id="BLOGGER_PHOTO_ID_5617869147438598002" border="0" /></a><span style="font-style: italic;"><br /></span><span style="font-weight: bold; color: rgb(255, 102, 0);font-size:130%;" >Latest progress (18 Nov 2011)</span><br /><br /><span style="font-style: italic;"><a onblur="try {parent.deselectBloggerImageGracefully();} catch(e) {}" href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjBvgrUY0rA9p0Vu4C9KfOoi1vMEWc_sbnuE-mMPR1TYvMWxl2vvLnBQdoPtgcCB_IqIAjBISGodl2VHjU21x3DrSBctXBqO4uoQo_6rfBB1o4-OM56tRhdofjeYAV5Qh2n4hJi8UdS3RA/s1600/DSC_8390.jpg"><img style="display: block; margin: 0px auto 10px; text-align: center; cursor: pointer; width: 400px; height: 266px;" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjBvgrUY0rA9p0Vu4C9KfOoi1vMEWc_sbnuE-mMPR1TYvMWxl2vvLnBQdoPtgcCB_IqIAjBISGodl2VHjU21x3DrSBctXBqO4uoQo_6rfBB1o4-OM56tRhdofjeYAV5Qh2n4hJi8UdS3RA/s400/DSC_8390.jpg" alt="" id="BLOGGER_PHOTO_ID_5676276170096910466" border="0" /></a></span></div><br /><span style="font-weight: bold; color: rgb(255, 102, 0);">Goal: </span><br />To construct a dedicated Audio room with sensible acoustics and aesthetics for under $500.<br /><br />This is a journey in constructing a dedicated listening room. The room is a 1-car garage which needs major cleanup.<br /><br />Build discussions is at <a href="http://www.stereo.net.au/forums/showthread.php/36177-Building-the-Gaincave">StereoNet Australia</a>.<br /><br /><span style="font-weight: bold; color: rgb(255, 102, 0);">13/6/2011</span><br />I tried playing the S9R dipoles in the garage. To my surprise it sounded very good despite tin roof and door. Later measurements revealed RT60 of 250ms, which is *more dead* than my living room (400ms). Looking at all the "junk" in the garage it will be a long journey, but acoustically it's very good already! Target room reverb for dipole loudspeakers are about 300ms - 500ms.<br /><br /><a onblur="try {parent.deselectBloggerImageGracefully();} catch(e) {}" href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgEUZrVhzaNZttZcIlbW8nnOLTlruy6IEHlD5i34n6N5m4AKLpCw0no73RFzWUng3Ekrd84WXNTZh3QKbs1ZySsoypo55GajnJGvUoNT1N2iSXuGEvY-96BkEjCbxw8KE_miHNfl1SOBXY/s1600/DSC_6817.jpg"><img style="float: left; margin: 0pt 10px 10px 0pt; cursor: pointer; width: 200px; height: 133px;" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgEUZrVhzaNZttZcIlbW8nnOLTlruy6IEHlD5i34n6N5m4AKLpCw0no73RFzWUng3Ekrd84WXNTZh3QKbs1ZySsoypo55GajnJGvUoNT1N2iSXuGEvY-96BkEjCbxw8KE_miHNfl1SOBXY/s200/DSC_6817.jpg" alt="" id="BLOGGER_PHOTO_ID_5617867955893562034" border="0" /></a><a onblur="try {parent.deselectBloggerImageGracefully();} catch(e) {}" href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEinMHa54R4t1J5KIBdoaJry9kGZnchtY8iSbFFhAl-2-Nd8kuT58_27GssMBfnAqhW15kT6u4QltIyQXcy_4Rf8oHTFIc61m8XOvGuV7pl-vYfnIz5K0KZNLdRisiiscPWJtcowwpZyS5Q/s1600/T60.png"><img style="float: left; margin: 0pt 10px 10px 0pt; cursor: pointer; width: 200px; height: 164px;" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEinMHa54R4t1J5KIBdoaJry9kGZnchtY8iSbFFhAl-2-Nd8kuT58_27GssMBfnAqhW15kT6u4QltIyQXcy_4Rf8oHTFIc61m8XOvGuV7pl-vYfnIz5K0KZNLdRisiiscPWJtcowwpZyS5Q/s200/T60.png" alt="" id="BLOGGER_PHOTO_ID_5617867955027307202" border="0" /></a><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><span style="font-weight: bold; color: rgb(255, 102, 0);"><br />18/11/2011<br /></span>Major cleanup and update<br />- Curtains<br />- Lighting and automatic turn-on sensor<br /><br /><a onblur="try {parent.deselectBloggerImageGracefully();} catch(e) {}" href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEilfbZCduSrreqjUz5tp-BswU20K6cK7fqrNPR6EyfmUOCC47_ai4-oC8LNGdyVfDyjYmWZ0eTNVEn-DR8N1NOf013UvVo6jlTbG_kKcvyGbSlL1tU-SGrjbH9gykN4NSuiPRg2pVJWiA4/s1600/DSC_8390.jpg"><img style="cursor: pointer; width: 200px; height: 133px;" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEilfbZCduSrreqjUz5tp-BswU20K6cK7fqrNPR6EyfmUOCC47_ai4-oC8LNGdyVfDyjYmWZ0eTNVEn-DR8N1NOf013UvVo6jlTbG_kKcvyGbSlL1tU-SGrjbH9gykN4NSuiPRg2pVJWiA4/s200/DSC_8390.jpg" alt="" id="BLOGGER_PHOTO_ID_5676277168132996050" border="0" /></a><a onblur="try {parent.deselectBloggerImageGracefully();} catch(e) {}" href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgwkRXVOUao9r7LIW5S-nEApCbo5uHcQlkjfDSTSv4bbW4NhA7xFy8p5pfz9ZxJMZsUs-j49mWrAl9TkZTB0gCfr1hYlPbj_6zhVToLieSTiGckUX4J3GzG-WKJR1_TCKZ_2SkOsrUo3QY/s1600/DSC_8373.jpg"> <img style="cursor: pointer; width: 200px; height: 133px;" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgwkRXVOUao9r7LIW5S-nEApCbo5uHcQlkjfDSTSv4bbW4NhA7xFy8p5pfz9ZxJMZsUs-j49mWrAl9TkZTB0gCfr1hYlPbj_6zhVToLieSTiGckUX4J3GzG-WKJR1_TCKZ_2SkOsrUo3QY/s200/DSC_8373.jpg" alt="" id="BLOGGER_PHOTO_ID_5676277164817551106" border="0" /></a><br /><br /><span style="font-weight: bold; color: rgb(255, 102, 0);">Cost tracking<br /></span><span style="font-weight: bold;"><br /></span>Heater - $60<br />Curtain accessories - $110<br />Downlight kit - $40<br />Automatic light sensor - $15<br />===<br />Total so far = $225<br />Target max = $500<br /><br /><span style="font-weight: bold;"><br /></span><span style="font-weight: bold; color: rgb(255, 102, 0);"></span>Unknownnoreply@blogger.com0tag:blogger.com,1999:blog-6998112391780171236.post-43627498644557683992011-04-26T23:36:00.000-07:002015-09-16T01:55:41.988-07:00S18 - DSP 3-way 100dB Econowave<div dir="ltr" style="text-align: left;" trbidi="on">
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiVYlRyRYrr68iAVyJ-a0rxMB44yIwFkkdXsUoQuUi5-imXLo_vUvUCNXXRp_J5orTS8-a57LL2xMhlhVuDAdUzOrGgaM64NX0m0KeokrhD4HWt43698qwNJtOxlXqympcPlzCBPjkD5D0/s1600/S18.png" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="400" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiVYlRyRYrr68iAVyJ-a0rxMB44yIwFkkdXsUoQuUi5-imXLo_vUvUCNXXRp_J5orTS8-a57LL2xMhlhVuDAdUzOrGgaM64NX0m0KeokrhD4HWt43698qwNJtOxlXqympcPlzCBPjkD5D0/s400/S18.png" width="332" /></a></div>
<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEi0MHISE4sn5Dqu3UxvZmbSxsKE3LKPsoCLg98uQ2Nfstqzc44fS_E7TmZBizUmaRgQVcZnoIyIid2OneqEqj7Tdc0di1-2ayJYESXMGM4EeAT7DkLj2ygle-p-WeG9x-4jR2Fr0OKt8B8/s1600/S18.png" onblur="try {parent.deselectBloggerImageGracefully();} catch(e) {}"><br /></a>The goals of these speakers are:<br />
- Small form factor (24cm baffle width)<br />
- Constant directivity to 2.5khz<br />
- High sensitivity, 94+ dB depending the woofers used.<br />
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Waveguide: FaitalPro STH100<br />
Compression driver: B&C DE250<br />
Woofers: PRV Audio 8MR500-PhP-4 or B&C 8PS21<br />
Subwoofer: 2x Eminence Beta 12A<br />
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Follow the discussions at StereoNet Australia <a href="http://www.stereo.net.au/forums/index.php?/topic/89026-exodus-a-beast-of-100db/">here</a>.<br />
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Unknownnoreply@blogger.com0tag:blogger.com,1999:blog-6998112391780171236.post-20408805545910938162011-02-21T18:38:00.000-08:002011-02-22T23:15:28.607-08:00S17 - Constant Directivity Dipoles<a onblur="try {parent.deselectBloggerImageGracefully();} catch(e) {}" href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEj1CrCwQsRuDAOGR1HuS36eUUz3QPBQRaYs0sy2XV2LnC44Xu58WWAJcQWgBiEoAmnQnVHLEt5pmK53F09HmgzVLzG9Z24FnbOZNJ-Rlzp5huOEVA2h6X-T9qeM31LJTppWY3eVK623kRU/s1600/dsc_5338.jpg"><img style="display: block; margin: 0px auto 10px; text-align: center; cursor: pointer; width: 400px; height: 266px;" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEj1CrCwQsRuDAOGR1HuS36eUUz3QPBQRaYs0sy2XV2LnC44Xu58WWAJcQWgBiEoAmnQnVHLEt5pmK53F09HmgzVLzG9Z24FnbOZNJ-Rlzp5huOEVA2h6X-T9qeM31LJTppWY3eVK623kRU/s400/dsc_5338.jpg" alt="" id="BLOGGER_PHOTO_ID_5576710585859092834" border="0" /></a><br />While the S16 provides smooth directivity, they are lacking rear radiation. In this iteration I want real dipole radiation front and back, and uniform to very high frequencies. This can only be done with extemely short front-to-back distance.<br /><span style="color: rgb(255, 102, 0); font-weight: bold;font-size:130%;" ><br />Design</span><br /><br />The "tweeters" used areTandBand 3" full-range. They allow three things to happen:<br /><br />- Dipole peak to occur very high in the frequency range, allowing constant directivity<br />- Very open rear chamber for good rear frequency response<br />- Low crossover frequency.<br /><br /><br /><span style="font-weight: bold; color: rgb(255, 102, 0);font-size:130%;" >Measurements</span><br /><br />The directivity plot was measured indoor so there is room for improvement when I take it for outside measurement later.<br /><br />Follow the discussion at <a href="http://www.diyaudio.com/forums/multi-way/183696-s17-constant-directivity-dipoles-part-ii.html">DIYAudio</a>.<br /><br /><a onblur="try {parent.deselectBloggerImageGracefully();} catch(e) {}" href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiirVX_Qzhf8xnUqRlfqZIX2FEyCwsIo-9rdTLOAZFspFTERixBcZQw4OVwcTzUH4Bk-Blha8GLS_Ke40scumE5SrXeJ03ZtmEV9A-Fr7YSEFmWmmYkczld3rfAt8DVClokQX23b4VlfoQ/s1600/32a+contour.png"><img style="float: left; margin: 0pt 10px 10px 0pt; cursor: pointer; width: 200px; height: 132px;" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiirVX_Qzhf8xnUqRlfqZIX2FEyCwsIo-9rdTLOAZFspFTERixBcZQw4OVwcTzUH4Bk-Blha8GLS_Ke40scumE5SrXeJ03ZtmEV9A-Fr7YSEFmWmmYkczld3rfAt8DVClokQX23b4VlfoQ/s200/32a+contour.png" alt="" id="BLOGGER_PHOTO_ID_5576710369982490994" border="0" /></a><a onblur="try {parent.deselectBloggerImageGracefully();} catch(e) {}" href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjbiMl3MxrjrHE02lHaBB0MTDcBo0JYMSaAD72aKhCEI8kT3LHI5xIkWQpo3LKenv2Wa_oDA-PqVpFU4nR3CIyfSbRVWvjjW49VXRdYjmKa5b8ojgDcP0vvT-IRxXUcEYtKrnF6UqRfyL8/s1600/32a.png"><img style="float: left; margin: 0pt 10px 10px 0pt; cursor: pointer; width: 200px; height: 130px;" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjbiMl3MxrjrHE02lHaBB0MTDcBo0JYMSaAD72aKhCEI8kT3LHI5xIkWQpo3LKenv2Wa_oDA-PqVpFU4nR3CIyfSbRVWvjjW49VXRdYjmKa5b8ojgDcP0vvT-IRxXUcEYtKrnF6UqRfyL8/s200/32a.png" alt="" id="BLOGGER_PHOTO_ID_5576710363411709602" border="0" /></a><br /><br /><br /><br /><br /><br /><br /><br /><br />These are respectable uniform dipolar radiation, impossible to achieve with traditional methods like back to back dome tweeters.<br /><br />The tradeoff is high frequency resolution of the 3" fullrange drivers.Unknownnoreply@blogger.com3tag:blogger.com,1999:blog-6998112391780171236.post-50393972523030850592011-02-21T10:54:00.000-08:002016-06-16T13:42:10.332-07:00Visits and GTGs<div dir="ltr" style="text-align: left;" trbidi="on">
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Social events are part of a hi-fi hobby and as an amateur enthusiast I had been very lucky to enjoy the company of friendly visitors and as a guest to others.<br />
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<span style="color: #ff6600; font-weight: bold;"><span style="font-size: 180%;">GTGs (Get-Together) and Events</span></span><br />
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<span style="color: red;"><b>PSE-144 GTG </b></span>- 27/9/2015<br />
After hearing unity variants before (original unities, Yorkville) it's great to hear these PSE-144 from Red Spade Audio at Joz' house. I think they are the 'Ferraris of loudspeakers'.<br />
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<span style="color: red;"><b>Redefy TWO GTG </b></span>- 2/9/2015<br />
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Spectacular speakers built by Henry at Martin's place. They follow the Econowave philosophy using FaitalPro drivers and waveguides.</div>
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<span style="color: red;"><b>Same64 (Marian) DIY speakers </b></span>- 1/9/2015</div>
Listened to great passive build by Marian. 12" subwoofers, 5" TangBand metal fullrange and small Dayton AMT<br />
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<span style="color: red;"><b>2013 Melbourne Audio Show </b></span>- 18/10/13<br />
<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhDt6JtGWUiTtATxu1j3Q7K9HXbClTUqOfXyGgrkssoq_mxJfFF9P2xBUPBBzqOGShX2d7crJJqNXFF_IaumR6gGJc0n7TnSC4POiREJFXuTXh7Ef7vXxKdi9evafD_ZqwWwBR7TkvuIL8/s1600/Kronos.jpg" imageanchor="1" style="clear: left; float: left; margin-bottom: 1em; margin-right: 1em;"><img border="0" height="200" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhDt6JtGWUiTtATxu1j3Q7K9HXbClTUqOfXyGgrkssoq_mxJfFF9P2xBUPBBzqOGShX2d7crJJqNXFF_IaumR6gGJc0n7TnSC4POiREJFXuTXh7Ef7vXxKdi9evafD_ZqwWwBR7TkvuIL8/s200/Kronos.jpg" width="174" /></a><br />
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Great event, and even better than the last 2 year. Beautiful venue.<br />
I was most impressed with the build of Kyron Kronos. Although acoustically it's not the latest generations of dipoles (like lx521, Nao Note) there was definitely nothing wrong with the sonics of these loudspeakers.<br />
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<b><span style="color: red;">Red Spade S3 GTG</span></b>- 20/1/13<br />
Measured <a href="http://redspade-audio.blogspot.com/2013/01/s3-prototype-dispersion-measurements.html">S3 Unity Horn</a> prototype. Excellent directivity to ~250hz ! I can't live with the size, unfortunately. <br />
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<span style="background-color: white;"><span style="color: red;"><b>Matt's Hoyt-Bedrford</b></span></span><span style="color: red; font-weight: bold;"> </span>- 22/7/2012<br />
Had a great evening at Matt's listening to Hoyt-Bedford fullrange driven by valve amp and Kuzma + SOTA turntable.<br />
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<span style="background-color: white;"><span style="color: red;"><b>Musikelectronic Geithain 901K</b></span></span><span style="color: red; font-weight: bold;"> (Pure Music Group) </span>- 24/6/2012
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Attended GTG at Pure Music Group Mornington.<br />
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjmWqo5zYjMIm9qzLKVXj0fk5XrcRvTgU6NNoX1A407vGwsBbP1QzzYenYfB_dynZ1DJGcKOikX2Fk57G212Wt_EYUk5aQ0dRXY_M7_LjA4tzXtnb8HZ-AeKReolCTynpKkCeaPCGS22-I/s1600/MEG.jpg" imageanchor="1" style="clear: left; float: left; margin-bottom: 1em; margin-right: 1em;"><img border="0" height="143" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjmWqo5zYjMIm9qzLKVXj0fk5XrcRvTgU6NNoX1A407vGwsBbP1QzzYenYfB_dynZ1DJGcKOikX2Fk57G212Wt_EYUk5aQ0dRXY_M7_LjA4tzXtnb8HZ-AeKReolCTynpKkCeaPCGS22-I/s320/MEG.jpg" width="320" /></a></div>
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<span style="background-color: white;">These are exceptional speakers. They actually managed to build Cardioid radiating speakers from 30 to 250hz. This is not an easy task. </span><br />
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<span style="color: red; font-weight: bold;">LINN high-end system (Warren's) </span>- 3/6/2012<br />
At Patterson Lakes, which is very close from my place.<br />
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--><span style="color: red; font-weight: bold;">Synergy Horns GTG </span>- 5/11/2011<span style="color: red; font-weight: bold;"><br /></span>Measurements and listening to various implementation of Unity Horns. We had Yorkville Unity by Tom Danley and Paul's DIY versions. They sounded great.<br />
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Report at <a href="http://www.stereo.net.au/forums/index.php/topic/36124-synergy-measurement-gtg/">StereoNet Australia.</a><br />
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<span style="color: red; font-weight: bold;"><br />The Australian Audio and AV Show</span><br />
October 21st 2011<br />
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<span style="text-decoration: underline;"><br /></span><span style="color: red; font-weight: bold;">Roger's Unity Horns</span> - 21/5/2011<br />
My second visit listening to <a href="http://www.stereo.net.au/forums/showthread.php/35469-Unity-Horns-18-quot-multi-sub-GTG">his Unity Horn system</a>. These are extreme-SPL setup, the horns themselves are 100+db utilising compression drivers and 8 Misco midranges.<br />
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEghxeXJyTjjmoVFNvznXTP_2-pVsHbrI1qIAHGHF_QKdoj3RWDnsLx1VMPKBCiyTWR9vKk8QewrDRrEZGEgH8NbApFh_oamUN04k5FHnmnkk-izbj9il0jrw433DrVO7k75gMuIPPw4pUY/s1600/Unity%252BTD18.jpg"><img alt="" border="0" id="BLOGGER_PHOTO_ID_5612448940355961714" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEghxeXJyTjjmoVFNvznXTP_2-pVsHbrI1qIAHGHF_QKdoj3RWDnsLx1VMPKBCiyTWR9vKk8QewrDRrEZGEgH8NbApFh_oamUN04k5FHnmnkk-izbj9il0jrw433DrVO7k75gMuIPPw4pUY/s200/Unity%252BTD18.jpg" style="cursor: pointer; float: left; height: 196px; margin: 0pt 10px 10px 0pt; width: 200px;" /></a>2x Unity Horns. Real ones from Tom Danley and only two in Australia (!)<br />
2x 18" AE woofers, ported<br />
2x 12" woofers in bandpass configuration<br />
1x 18" Maelstrom, sealed<br />
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The system would easily power a hall and I don't have to mention the ease of which they play loud passages.<br />
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<span style="color: red; font-weight: bold;">Linkwitz Orion</span> - 25/2/2011<br />
A very rare chance in Australia, this is my dream loudspeakers and are the reference for Dipole speaker design. Created by Sigfried Linkwitz himself their resolution and projection is very hard to match. The reason I don't have them is the lack of $14000 (or $4000 DIY) to own one.<br />
<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgtm6LIGgfSJZSq2UsrZIT4zkJbBOLJIDo4mBvJJgzw_9PDeUSQSRca8SHqk9L38mGvmoPRqh9OMuXAJ8KeSibSWoBJ3LqwikSbus9VHaOlPLi00920f0axAWDfVJYUh_k1TsaQRe7w8NE/s1600/RainerGunther2.jpg"><img alt="" border="0" id="BLOGGER_PHOTO_ID_5612453391889697026" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgtm6LIGgfSJZSq2UsrZIT4zkJbBOLJIDo4mBvJJgzw_9PDeUSQSRca8SHqk9L38mGvmoPRqh9OMuXAJ8KeSibSWoBJ3LqwikSbus9VHaOlPLi00920f0axAWDfVJYUh_k1TsaQRe7w8NE/s200/RainerGunther2.jpg" style="cursor: pointer; float: left; height: 171px; margin: 0pt 10px 10px 0pt; width: 200px;" /></a><br />
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<span style="color: red; font-weight: bold;">Ching Chung's system (Switzerland)</span> - 22/9/2010<br />
Ching Chung is a collector of "ultra-fi". These are esoteric and very expensive equipments. Among his collections are Halcro amplifiers ($120,000+ !), Cary amps/pre, and various loudspeakers from Martin Logans to Cain-Cain fulrange horns which he likes most.<br />
<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEi6WelSBjbLQh2v4mbVphQHx7uSc6gzFKIl_g65xhBfXaeVO-eLLWujdNOPFPlVPj9rpfhWFDaAdh2kxz397uWYFpuBws6LIudg3xJWCalIE0-DIVai8CDOoXFYnRbpRi_HU52zMVn619w/s1600/imgp8896.jpg"><img alt="" border="0" id="BLOGGER_PHOTO_ID_5612444683555102146" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEi6WelSBjbLQh2v4mbVphQHx7uSc6gzFKIl_g65xhBfXaeVO-eLLWujdNOPFPlVPj9rpfhWFDaAdh2kxz397uWYFpuBws6LIudg3xJWCalIE0-DIVai8CDOoXFYnRbpRi_HU52zMVn619w/s200/imgp8896.jpg" style="cursor: pointer; float: left; height: 150px; margin: 0pt 10px 10px 0pt; width: 200px;" /></a><br />
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<span style="color: red; font-weight: bold;">Waveguide GTG II at Paul Spencer's</span> - 5/3/2011<br />
This was the second get together between waveguide enthusiasts. This time we had more waveguides, compression drivers and even a plasma tweeter!<br />
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjZCrH4AcV2mUGfycUys01JZ8xNligeyu-HBWVwmi35UoyycAz1OOysHikjkGUAqpeqUyRGRKFY5MHZ5ant5zeMAdm3vNgqktMRcni96GKIV-jB3f0-AlfOdPl1UQZrvPMvJZawzk-gN3Q/s1600/header.jpg"><img alt="" border="0" id="BLOGGER_PHOTO_ID_5612456039392325538" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjZCrH4AcV2mUGfycUys01JZ8xNligeyu-HBWVwmi35UoyycAz1OOysHikjkGUAqpeqUyRGRKFY5MHZ5ant5zeMAdm3vNgqktMRcni96GKIV-jB3f0-AlfOdPl1UQZrvPMvJZawzk-gN3Q/s200/header.jpg" style="cursor: pointer; float: left; height: 132px; margin: 0pt 10px 10px 0pt; width: 200px;" /></a><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEg8904maRY4q4ZzT9RxHTF98uW7B2-BF_Wcj2gEhIEPaB50hz62M_b8e6C3YHqCy7Zu6h8wUPZehWqX5vz-gQBZPB8EOk0lIWbbOk48EZbRWDNSSSXX3lWA8XQyMKWo-HzakPV82p5qjAs/s1600/waveguides.jpg"><img alt="" border="0" id="BLOGGER_PHOTO_ID_5612456043408719890" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEg8904maRY4q4ZzT9RxHTF98uW7B2-BF_Wcj2gEhIEPaB50hz62M_b8e6C3YHqCy7Zu6h8wUPZehWqX5vz-gQBZPB8EOk0lIWbbOk48EZbRWDNSSSXX3lWA8XQyMKWo-HzakPV82p5qjAs/s200/waveguides.jpg" style="cursor: pointer; float: left; height: 133px; margin: 0pt 10px 10px 0pt; width: 200px;" /></a><br />
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Read the results here on <a href="http://redspade-audio.blogspot.com/2011/03/waveguide-gtg-2.html">Paul's blog</a>.<br />
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<span style="color: red; font-weight: bold;">DSP GTG part II at Roger's</span> - 5/12/2010<br />
This time I constructed an instant-switching box. We could instantly switch between any two DSP units (both 4 channel inputs and outputs). This method is much more revealing and immediate than ABX blind test.<br />
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEj8EMe8iH-9iAGw4bHpbZ_VOEz7I_70dWVfCztTkDWWDs4KnflaDXe907a5xx9ItZ7-UXST-Hq6-Ewj6wJZssR_dpqN8ilpYRJwmNTlVJIQa9UXBmji-Rqjhyphenhyphen3e2y8Kcn0wXK0-u0Q9_YQ/s1600/testbox.jpg"><img alt="" border="0" id="BLOGGER_PHOTO_ID_5612460540417528690" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEj8EMe8iH-9iAGw4bHpbZ_VOEz7I_70dWVfCztTkDWWDs4KnflaDXe907a5xx9ItZ7-UXST-Hq6-Ewj6wJZssR_dpqN8ilpYRJwmNTlVJIQa9UXBmji-Rqjhyphenhyphen3e2y8Kcn0wXK0-u0Q9_YQ/s200/testbox.jpg" style="cursor: pointer; float: left; height: 86px; margin: 0pt 10px 10px 0pt; width: 200px;" /></a><br />
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The reference speakers were Roger's very high resolution Unity Horns. Again, I felt I could not detect differences between DSP units although some prefers miniDSP.<br />
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<span style="color: red; font-weight: bold;">DSP GTG part I at Keith's</span> - 31/10/2010<br />
We were very lucky in Melbourne to have a population of the following DSP crossovers to test:<br />
- Behringer DCX2496 (Paul Spencer)<br />
- Behringer DCX2496, modified (Cybermurphy's)<br />
- Behringer CX2310 (Keith's)<br />
- DEQX HDP-3 (Keith's)<br />
- MiniDSP (Gainphile's)<br />
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEh6XjOI4IjaQ0kbnkl8dFKmZAKfUPmiJhycwaEYhMXtDDHylXk7q5IGb0GIVvPVEL2KB4b-y8FytJ9NYrkKGIZ29ipXudXE0hCRdX0JlgIhLS_NxKcH9mSSshRg5xo3LUSD-JkHUzvj8ds/s1600/_MG_5602.jpg"><img alt="" border="0" id="BLOGGER_PHOTO_ID_5612458429833966034" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEh6XjOI4IjaQ0kbnkl8dFKmZAKfUPmiJhycwaEYhMXtDDHylXk7q5IGb0GIVvPVEL2KB4b-y8FytJ9NYrkKGIZ29ipXudXE0hCRdX0JlgIhLS_NxKcH9mSSshRg5xo3LUSD-JkHUzvj8ds/s200/_MG_5602.jpg" style="cursor: pointer; float: left; height: 133px; margin: 0pt 10px 10px 0pt; width: 200px;" /></a><br />
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The loudspeakers used were Acapella Violons powered by Cary monoblocks and SGR amplifiers. Some thought that MiniDSP is the best sounding, but I could not hear any difference between any of the units (with the exception of DEQX which did not operate properly).<br />
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<span style="color: red; font-weight: bold;">Craig's Jazzman</span><br />
Craig lives only 5 minutes from me, and offered free leftover stuffing from his Jazzman project. I had a listen to them. These are very intricately built speakers.<br />
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhgap-aWXBCISJkp2IlfaD5Czdn66gBavvoqT1cM44BNwdHfQ2v-n0jkOJDdw41f65546cfdKoCaYVixQ6fYLX3EHLVhy0w1VURugRplrlXt7QDB33SiiMK8hEREF0_IEMDcbK4MKMmapM/s1600/P1010010.JPG"><img alt="" border="0" id="BLOGGER_PHOTO_ID_5612468345552237730" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhgap-aWXBCISJkp2IlfaD5Czdn66gBavvoqT1cM44BNwdHfQ2v-n0jkOJDdw41f65546cfdKoCaYVixQ6fYLX3EHLVhy0w1VURugRplrlXt7QDB33SiiMK8hEREF0_IEMDcbK4MKMmapM/s200/P1010010.JPG" style="cursor: pointer; float: left; height: 150px; margin: 0pt 10px 10px 0pt; width: 200px;" /></a><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEha89N9NPoLu8fNy27C-OFFm78fYbRJa1HMTQVP1Anyoq9A3GnNdKKgA2rIoZueO4ERvGLn4TqmLYijX_f3-7oh1obQbTYTW10ZoSncNF2YB5EAculxXOVIZJN72Y_GqtNBk9Zph_RDn1U/s1600/SANY0125.JPG"><img alt="" border="0" id="BLOGGER_PHOTO_ID_5612468348255030690" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEha89N9NPoLu8fNy27C-OFFm78fYbRJa1HMTQVP1Anyoq9A3GnNdKKgA2rIoZueO4ERvGLn4TqmLYijX_f3-7oh1obQbTYTW10ZoSncNF2YB5EAculxXOVIZJN72Y_GqtNBk9Zph_RDn1U/s200/SANY0125.JPG" style="cursor: pointer; float: left; height: 150px; margin: 0pt 10px 10px 0pt; width: 200px;" /></a><br />
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Very beautiful, very smooth sound and deep bass. We had great listen of Dire Straits and Muddy Waters LP.<br />
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<span style="color: red; font-weight: bold;">Acapella Violon GTG at Keith's</span> -<br />
I enjoyed Keith's drop-dead gorgeous setup. A pair of Acapella Violon running actively with 4 (!) Cary monoblocs.<br />
<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjnqTx-61Y2pBHvCtOtLmrXj1JIHhXBW2qzK5stBTZA9k3AGN_-5SFmiZhfmV_Xgsn0f9zQA3KQWrWp6qagQCztU1TMneR9vI9jr0SAfYCoYd5SdZWLxUNeipx7Pigwd1v9miVAtX3gC_Q/s1600/original.jpg"><img alt="" border="0" id="BLOGGER_PHOTO_ID_5612465423661351218" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjnqTx-61Y2pBHvCtOtLmrXj1JIHhXBW2qzK5stBTZA9k3AGN_-5SFmiZhfmV_Xgsn0f9zQA3KQWrWp6qagQCztU1TMneR9vI9jr0SAfYCoYd5SdZWLxUNeipx7Pigwd1v9miVAtX3gC_Q/s200/original.jpg" style="cursor: pointer; float: left; height: 134px; margin: 0pt 10px 10px 0pt; width: 200px;" /></a><br />
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The dynamics and presentation was simply stunning! This was the first time for me to hear horns too.<br />
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Legend Tikandi & DEQX GTG<br />
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<span style="color: red; font-weight: bold;">Tiono's System (Singapore)</span> - 20/10/2010<br />
He is my university colleague and avvid collector of vinyl. His system consists of Sonus Faber monitors, Adcom GFA amps, and REL subs. He particularly pay attention to intricate electonic details (as electrical engineers do!)<br />
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjBiJ80t72URELTo-gE8FLUNDvzxdKhnrcb38isXwbWLzI30nJl-l8QWyCAU8df21pyTT9LJ2p0MPYo2JzGPohTju2iPf9zJ9z-R6VXDDLoTbZHFM0yNd-9yYRfXLKLMD9PjgdsiI0pSjk/s1600/IMG_5086.JPG"><img alt="" border="0" id="BLOGGER_PHOTO_ID_5612448106717163170" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjBiJ80t72URELTo-gE8FLUNDvzxdKhnrcb38isXwbWLzI30nJl-l8QWyCAU8df21pyTT9LJ2p0MPYo2JzGPohTju2iPf9zJ9z-R6VXDDLoTbZHFM0yNd-9yYRfXLKLMD9PjgdsiI0pSjk/s200/IMG_5086.JPG" style="cursor: pointer; float: left; height: 156px; margin: 0pt 10px 10px 0pt; width: 200px;" /></a><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiRF-W8IeAODBw-kxLhG2B8Rsk7TKNzA_X0giGGQDrLOUInY49QnAFfWVYU5jlC_6E0hlM9g6OjIlYSOpctGXVjfOZy4hhVtwXLFlX6bW5lteVR38kgDnzjszBtf1joawwyVgRQhwp5qgs/s1600/IMG_5088.JPG"><img alt="" border="0" id="BLOGGER_PHOTO_ID_5612446773683610530" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiRF-W8IeAODBw-kxLhG2B8Rsk7TKNzA_X0giGGQDrLOUInY49QnAFfWVYU5jlC_6E0hlM9g6OjIlYSOpctGXVjfOZy4hhVtwXLFlX6bW5lteVR38kgDnzjszBtf1joawwyVgRQhwp5qgs/s200/IMG_5088.JPG" style="cursor: pointer; float: left; height: 132px; margin: 0pt 10px 10px 0pt; width: 200px;" /></a><br />
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He has since replaced the loudspeakers with <a href="http://ftje-audio.blogspot.com/2009/02/koleksi-magnepan-t81.html">Magnepan planars</a>.<br />
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<span style="color: red; font-weight: bold;">Adam Tensor GTG at Michael's</span> - 22/8/2009<br />
A very enjoyable afternoon listening to a pair of Adam Tensor Delta. They had sand-filled enclosure. "The Prof" is also coffee connosieur and cycling fanatic. Showed us great pics of "Tour de France".<br />
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEh8HoUz-olQA3WNvxxvppZc4l9nqBLhInj7pemyJ2DihSjCZscSgyODyFKbWkGXJ5hJo2WYwSTg43WcsXLcBNNk6RPn3NYY41YjyXjFwKVgPFcTqI2irXcN1ZrgUCv3j7RrWYbw7N5SW9c/s1600/System.jpg"><img alt="" border="0" id="BLOGGER_PHOTO_ID_5612463687542999250" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEh8HoUz-olQA3WNvxxvppZc4l9nqBLhInj7pemyJ2DihSjCZscSgyODyFKbWkGXJ5hJo2WYwSTg43WcsXLcBNNk6RPn3NYY41YjyXjFwKVgPFcTqI2irXcN1ZrgUCv3j7RrWYbw7N5SW9c/s200/System.jpg" style="cursor: pointer; float: left; height: 133px; margin: 0pt 10px 10px 0pt; width: 200px;" /></a><br />
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<span style="color: red; font-weight: bold;">DEQX and Legend Tikandi </span>- 20/6/2009<br />
I travelled to Mark's beautiful house in Emerald to listen to a pair of Legend Tikandi. These Australian loudspeakers are using the venerable Seas Excel and Visaton Ceramic-coated aluminium tweeters. They are actively driven with DEQX DSP units.<br />
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEi9vnQFI0-HRu_f8pp5XLda03RaKrzAh_4WRn5GMhenPwg8rqwU2QV9CgKsEyA5pUOcTfX7h7hLos8D7ZU8GYQGU7jDby_Xy1BOIWyfReq7C2H-wrLGP9IkUlXMflICa0S8jEZrB8L856E/s1600/tikandi_sm2.jpg" style="margin-left: 1em; margin-right: 1em;"><img alt="" border="0" id="BLOGGER_PHOTO_ID_5612470276491496322" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEi9vnQFI0-HRu_f8pp5XLda03RaKrzAh_4WRn5GMhenPwg8rqwU2QV9CgKsEyA5pUOcTfX7h7hLos8D7ZU8GYQGU7jDby_Xy1BOIWyfReq7C2H-wrLGP9IkUlXMflICa0S8jEZrB8L856E/s200/tikandi_sm2.jpg" style="float: left; height: 150px; margin: 0pt 10px 10px 0pt; width: 200px;" /></a></div>
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<span style="color: #ff6600; font-size: 28.8px; font-weight: bold;">Visitors</span><br />
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<b><span style="color: red;">Weekday GTG</span></b> - 7/12/2012<br />
Marian wanted to hear the ultra compact S20z so I arranged a mini-GTG. Warren and David came along and Mike dropped his NaoNote for me to have for a week ! We listened to S19, Pluto clone, Warren's Linn Bookshelves, and S20z.<br />
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEj9ueV569sZZJhu0Q_Fo72tg5VY2Q2LFDPMFNNjCsxugNsy2t39gCq5k-4BcordU4-F4jdzMWeUItiz5F3JXS0Q3ToGKu5XlTupGR1bUFTgmti1dwE3UJdaQ0l8hrLjXhc77d94whvLc-U/s1600/DSC_3415.JPG" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="132" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEj9ueV569sZZJhu0Q_Fo72tg5VY2Q2LFDPMFNNjCsxugNsy2t39gCq5k-4BcordU4-F4jdzMWeUItiz5F3JXS0Q3ToGKu5XlTupGR1bUFTgmti1dwE3UJdaQ0l8hrLjXhc77d94whvLc-U/s200/DSC_3415.JPG" width="200" /></a><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjbxYZaMBMA5OEZCC0iZ1ZIgv2hyphenhyphen5Vqa98_utxRCKbU0fxZJDZ-JdIurjerwoaBeEODp4gK1gZ22I_fjy91yg1qcinG11QKoCbRJNBZWYEpCEHUSJQzHBWXmt93NBgcwQPHBealFQ7iMKo/s1600/DSC_3416.JPG" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="132" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjbxYZaMBMA5OEZCC0iZ1ZIgv2hyphenhyphen5Vqa98_utxRCKbU0fxZJDZ-JdIurjerwoaBeEODp4gK1gZ22I_fjy91yg1qcinG11QKoCbRJNBZWYEpCEHUSJQzHBWXmt93NBgcwQPHBealFQ7iMKo/s200/DSC_3416.JPG" width="200" /></a></div>
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<b style="color: red;">Waveguide GTG IV</b> - 18/12/2011<br />
Roger and Paul visited to measure various Celestion drivers. The driver is an excellent match to Pyle Econowave waveguide. Results of measurements <a href="http://www.diyaudio.com/forums/multi-way/178187-great-waveguide-list-9.html">at DIYAudio</a><br />
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<span style="color: red; font-weight: bold;">Melbourne audio round-trip GTG</span> - 27/11/2011<br />
Paul, Warren, Matt, and Mike visited as part of a round-trip GTG. We later then went to Craig's place to hear the Jazzman and then to Trevor's to hear the Zingali horns. Report <a href="http://www.stereo.net.au/forums/showthread.php/38240-GTG-Melbourne-audio-round-trip-%28November%29?p=621636&viewfull=1#post621636">here</a>.<br />
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<span style="color: red; font-weight: bold;">Olivier & Inken from </span><a href="http://www.2pi-online.de/" style="color: red; font-weight: bold;">2pi-online.de</a><span style="font-weight: bold;"> </span>- 29/3/2011<br />
Dropped by from Germany on their Aussie holiday to listen to S16, S15, and Pluto.<br />
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiuDzsAIIF-2tL_FjkF2tMbF7DuYRS9KRUi6L0JisoJCw151R8lMGIuL2-t1Amth9OFhrnlp3osdguKur8Lp-4xz5uHt9CROfEFZu8CtCbtmRbEDl5OP89mgCFzglAVfJqITr4YWz1vX5Q/s1600/EuropeJazz1b.jpg"><img alt="" border="0" id="BLOGGER_PHOTO_ID_5612384046311189458" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiuDzsAIIF-2tL_FjkF2tMbF7DuYRS9KRUi6L0JisoJCw151R8lMGIuL2-t1Amth9OFhrnlp3osdguKur8Lp-4xz5uHt9CROfEFZu8CtCbtmRbEDl5OP89mgCFzglAVfJqITr4YWz1vX5Q/s200/EuropeJazz1b.jpg" style="cursor: pointer; float: left; height: 152px; margin: 0pt 10px 10px 0pt; width: 200px;" /></a><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjUyZXXp146fcP_duNdTt3m2lIjsaZNLyJsgnhn9OfVzu-h0xnZTWrlxthUTt_rHyCYy6VLYHfC910_8uc79xQ_mw4LDHRseehPh0JvEIrgT4ew7x18goJgnmBY3807anQAKihhNoH5bLQ/s1600/EuropeJazz2b.jpg"><img alt="" border="0" id="BLOGGER_PHOTO_ID_5612384050165463234" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjUyZXXp146fcP_duNdTt3m2lIjsaZNLyJsgnhn9OfVzu-h0xnZTWrlxthUTt_rHyCYy6VLYHfC910_8uc79xQ_mw4LDHRseehPh0JvEIrgT4ew7x18goJgnmBY3807anQAKihhNoH5bLQ/s200/EuropeJazz2b.jpg" style="cursor: pointer; float: left; height: 153px; margin: 0pt 10px 10px 0pt; width: 200px;" /></a><br />
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Olivier posted his impressions of my speakers <a href="http://www.2pi-online.de/html/visits.htm">on his site</a>. His observation and preference is very much similar to mine.<br />
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<span style="font-weight: bold;"><span style="color: red;">Waveguide shootout I</span> </span>- 16/1/2011<br />
A group of waveguide type speakers enthusiasts got together in Bonbeach for the 1st round of shootout. We had various compression drivers and horns of various shapes and sizes from D220Ti, DE250, BMS, Econowave Pyle, Oblate-spheroid, etc.<br />
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEive8Pn9grHmAykgAxUP3bhH7XINy7-2EuXBf9xq9URAUTsQEl5LP3ge5CDbCbXXnhCr2AVtHxYz4FFxf8zQpY9Nnyck9b7Vao4Drd3nEqAc6kGx8C-ZnQbqQVAHreEPJT9-_0crV6dT6E/s1600/WG-GTG.jpg"><img alt="" border="0" id="BLOGGER_PHOTO_ID_5597813990160225426" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEive8Pn9grHmAykgAxUP3bhH7XINy7-2EuXBf9xq9URAUTsQEl5LP3ge5CDbCbXXnhCr2AVtHxYz4FFxf8zQpY9Nnyck9b7Vao4Drd3nEqAc6kGx8C-ZnQbqQVAHreEPJT9-_0crV6dT6E/s200/WG-GTG.jpg" style="cursor: pointer; float: left; height: 144px; margin: 0pt 10px 10px 0pt; width: 200px;" /></a><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgow32QuqvoEvIXe5YoEeLvOItpXwdZIE0XH4-jiSK59a0nRJCwnbRKq3jJlGgghG6sVY700V2snHHK_q8sjko-BlL8FuhBqCUMfMGqS2dcrrFh6dGH58UQwOs0ooQXTj7EBEDfIJ_MGUU/s1600/Dayton10-Selenium-sonogram-n.png"><img alt="" border="0" id="BLOGGER_PHOTO_ID_5612315349687936770" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgow32QuqvoEvIXe5YoEeLvOItpXwdZIE0XH4-jiSK59a0nRJCwnbRKq3jJlGgghG6sVY700V2snHHK_q8sjko-BlL8FuhBqCUMfMGqS2dcrrFh6dGH58UQwOs0ooQXTj7EBEDfIJ_MGUU/s200/Dayton10-Selenium-sonogram-n.png" style="cursor: pointer; float: left; height: 100px; margin: 0pt 10px 10px 0pt; width: 200px;" /></a><br />
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Paul Spencer had written about this event <a href="http://redspade-audio.blogspot.com/2011/01/waveguide-shootout.html">in his blog</a>, he clearly explain how to read sonogram plots, etc.<br />
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<span style="color: red; font-weight: bold;">Dipole - Omni Show & Tell</span> - 27/6/2009<br />
Paul Spencer and I arranged GTG in Melbourne to present dipole and omni speakers. I had my s8 and analogue-driver Pluto clone, and Paul presented his Vifa based dipoles (with Rythmic subs).<br />
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEi-Qv85PA41_Zghqijg0gwUxRoYrhaX8-ofYoO9ES3mf6rTZ_n6jlq86rwFS9HrHchRqX_4wkzqhwgg76rYXHj1ShsZS1eGy6kcuhgeC8UhoCGkPmV5dlRMfTO9xl4mQBsNPrA7K0DoZx4/s1600/contents_ob_s.jpg"><img alt="" border="0" id="BLOGGER_PHOTO_ID_5612472384317026370" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEi-Qv85PA41_Zghqijg0gwUxRoYrhaX8-ofYoO9ES3mf6rTZ_n6jlq86rwFS9HrHchRqX_4wkzqhwgg76rYXHj1ShsZS1eGy6kcuhgeC8UhoCGkPmV5dlRMfTO9xl4mQBsNPrA7K0DoZx4/s200/contents_ob_s.jpg" style="cursor: pointer; float: left; height: 180px; margin: 0pt 10px 10px 0pt; width: 162px;" /></a><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEg7SEwoQLsch6FDZjVIJ7z9lwYurZXg4AfsjqzRUQnmLai4KMTdOSrFR-n9I72MeBa1IxIX6Bwol2NDsQ12pUPOfAaBPOe9kQNVaMgqD0PTzgkhA5_yYEpBE7PGlDd0VPoWaUupKCJ00Xo/s1600/DSC_9122.jpg"><img alt="" border="0" id="BLOGGER_PHOTO_ID_5612472381907775970" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEg7SEwoQLsch6FDZjVIJ7z9lwYurZXg4AfsjqzRUQnmLai4KMTdOSrFR-n9I72MeBa1IxIX6Bwol2NDsQ12pUPOfAaBPOe9kQNVaMgqD0PTzgkhA5_yYEpBE7PGlDd0VPoWaUupKCJ00Xo/s200/DSC_9122.jpg" style="cursor: pointer; float: left; height: 102px; margin: 0pt 10px 10px 0pt; width: 200px;" /></a><br />
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At the end of the day the visitors were most impressed with Pluto clone!<br />
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Paul's visit<br />
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Selwyn's visit<br />
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JPHoward visit</div>
Unknownnoreply@blogger.com0tag:blogger.com,1999:blog-6998112391780171236.post-29363499370473073562011-01-09T19:24:00.001-08:002014-05-29T04:37:43.830-07:00Measuring Open Baffle loudspeakers<div dir="ltr" style="text-align: left;" trbidi="on">
<span style="color: red; font-size: 130%; font-weight: bold;">A five-steps guide in great sounding Dipole loudspeakers</span><br />
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This is a simplified step-by-step instruction in measuring dipole loudspeakers. Dipole loudspeakers are unique. The rear radiation influence the front and this presents challenges.<br />
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Assumptions:<br />
<ul>
<li>3-way with active crossovers and Linkwitz-Riley filter using MiniDSP as active crossover</li>
<li>You understand basic crossover, filters (LT, Notch, Shelves), able to configure MiniDSP</li>
<li>You have and understand basic acoustic measurement <a href="http://gainphile.blogspot.com/2008/11/cheap-and-accurate-speaker-measurement.html">tools</a></li>
</ul>
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<span style="color: #3366ff; font-weight: bold;">Blue </span>= measurement step<br />
<span style="color: #ff6600;">Orange </span>= configuration step<span style="font-weight: bold;"><br /><br /><br /><span style="color: #cc0000; font-size: 130%;">Step 1 - Decide baffle width</span></span><br />
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It is a compromise between SPL and polar response and the general rule of thumb is baffle width should be narrower than 2x diameter of the midrange. Design the speakers so that the ear/listening height is between Midrange and Tweeters.<br />
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<span style="color: #cc0000; font-size: 130%; font-weight: bold;">Step 2 - Measure the Midrange</span><span style="font-weight: bold;"><br /></span>Mount the Midrange to the baffle, <b>take it outside</b>, lift it up so the midrange is >= 2m above the ground, and:<span style="color: #3366ff; font-weight: bold;"><br /><br />Measure from 1m at Midrange axis</span><br />
This will provide a graph which shows the frequency, height, and Q of dipole peak. <span style="color: #ff6600;">Compensate this using a notch filter</span>. q=1.4 and a=-4db is a good start. Notch frequency f is really hard to predict.<br />
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Observe where the dipole rolloff starts, and <span style="color: #ff6600;">compensate using +6db/oct</span> lowpass shelving filter.</div>
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The lowpass of the midrange will depend on excursion demand. Typically 100-200hz is good. <span style="color: #ff6600;">Set this as lowpass frequency</span> of midrange xo.<br />
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<span style="color: #3366ff; font-weight: bold;">Measure off axis from 0 deg to 90 deg, in 10deg increments.</span><br />
This will provide graph which shows where the dipole behaviour ends. Typically between 1.5khz to 2khz. This will set the M-T crossover point.<br />
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If the crossover point is too low for the tweeter (normally because the baffle width is too wide), then the dipole would not sound natural. Change the baffle.<br />
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<span style="font-size: 85%; font-style: italic;">Example: <a href="http://i188.photobucket.com/albums/z72/widhibrata/audio/compiledl21nowings10db.png">Measurements</a><br />showing excellent dipole response up to 2k<br />after which its polar response varies.</span><br />
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Both of the above midrange measurements <span style="font-weight: bold;">cannot </span>be reliably done indoors even with gating etc. Measurements for tweeters and woofers can be done indoors as shown below.<br />
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<span style="color: #cc0000; font-size: 130%; font-weight: bold;">Step 3 - Measure the Tweeters</span><br />
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Mount the tweeters and <b>take the speakers inside if needed</b> (but outside is always better). Mount the rear tweeter and wire in reverse if you are using back-to-back domes.<span style="color: #ff6600;"> Set the tweeter high-pass xo</span> as per value found from step 2.<br />
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<span style="color: #3366ff; font-weight: bold;">Measure from 1m at listening axis</span> (between M and T) and play pink noise or use impulse. Set tweeter level so that it is reasonably flat. Don't worry if it sounds too bright at this stage.<br />
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Reverse tweeter polarity and find the deepest null by<span style="color: #ff6600;"> setting delay values</span> or all-pass filter of the tweeter. This is to time-align both drivers. Once found, reverse back the tweeter. Measurement should be perfectly flat now. Note that with LR2, the tweeter should be reversed.<br />
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<span style="color: #cc0000; font-size: 130%;"><span style="font-weight: bold;">Step 4 - Measure the Woofers</span></span><br />
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Mount the woofer and <span style="color: #3366ff; font-weight: bold;">measure nearfield</span> (<b>1cm from cone</b>). If it's W or H-frame <span style="color: #3366ff; font-weight: bold;">measure from the opening plane</span>. Observe the shape of the frequency response and decide the Fs and Q. From there obtain values for Linkwitz transform target F and Q. F=20hz with Q=0.5 is good depending on woofer's excursion capability.<br />
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<span style="color: #ff6600;">Set the Linkwitz Transform</span> using values above and measure again to confirm. <span style="color: #ff6600;">Set also the +6b/oct</span> dipole rolloff compensation starting from xo point down to target F.<br />
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<span style="font-size: 85%; font-style: italic;">Example: <a href="http://i.imgur.com/F0cyo.png">Dipole woofer measurement</a> before (black) and<br />after (blue) LT filter is applied, showing F=20hz with Q=0.5.</span><br />
<span style="font-size: 85%;">Linkwitz transform is explained <a href="http://www.minidsp.com/applications/linkwitz-transform">here</a>.</span><br />
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<span style="color: #3366ff; font-weight: bold;">Measure from 1m from listening axis</span> between Midrange and Tweeter with pink noise. Reverse the woofer and find the deepest null by <span style="color: #ff6600;">setting Woofer's delay</span>. Reverse back and the Woofer and Midrange is now time-aligned.<br />
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<span style="font-size: 130%; font-weight: bold;"><br /><span style="color: #cc0000;">Step 5 - Listen and adjust levels</span></span><br />
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Listen to the completed speakers in stereo. Observe bass level and set accordingly. Listen to tweeter level with various program material (acoustic recording). If simple dome tweeters are used, most likely it will be too bright due to uneven dispersion. Reduce tweeter level about -2 or -3db (room dependent), or optionally <span style="color: #ff6600;">set a global EQ</span> using <a href="http://linkwitzlab.com/Presentations/BAF-Freq-response-requirements.pdf">Linkwitz DSS</a> filter (Shelving highpass with F=1.5khz, Q=1, attenuation= -1db).<br />
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This part of the design does require subjective observations, but do not try to compare with sounds from other loudspeakers. Use live acoustic (non-amplified) performance as reference and memory from speech, talking, etc. is useful.<br />
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Note that smooth dispersion at tweeter region is a pinnacle of Dipole design. When they are smooth, a flat setting would be correct. Refer to "NaO Note" or my own "S16/MS".<br />
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<span style="font-size: 130%;"><span style="font-weight: bold;">Summary</span></span><br />
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Dipoles can be methodically built just like any other loudspeakers using tools widely available to amateurs/DIYers. The critical section is the midrange which requires freespace/outdoor measurements when anaechoic chamber is not available.<br />
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Note that measurements at listening position is not necessary. While it is intuitive to do so, one cannot correct deviations in time domain with amplitude correction.<br />
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<span style="font-style: italic;">to be continued ...</span><br />
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<span style="font-size: 130%; font-weight: bold;">Advanced topics</span>:<br />
What then from here<br />
Electrical vs. acoustic response<br />
Difficulties with passive dipole loudspeakers<br />
Fixing the achiless heel of typical dipole setup<br />
Room analysis<br />
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<b>Updates:</b><br />
28/5/14 Minor editorial changes<br />
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Unknownnoreply@blogger.com3tag:blogger.com,1999:blog-6998112391780171236.post-59594270252093246212011-01-01T19:29:00.000-08:002013-09-17T17:24:46.068-07:00Music<div dir="ltr" style="text-align: left;" trbidi="on">
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<b>Daft Punk - Random Access Memories</b></div>
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Beautiful, dynamic assault on your senses. Needs to be played at 'discotheque' levels.</div>
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<a href="http://productionadvice.co.uk/daft-punk-mastering/">Why it sounds good </a></div>
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.oOo.</div>
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgsDVqbTWxlM6C8rf7TUDIHFciSXpLuG4ULSXZZqe6PK9wGqOWswmtQk_M90ZDjNuXcAHw3mCFz4bYWmNqjYLAsWJsvRAA0yms7N1rMFZTLQeIZ2xJ3irt5RKg3O7PprWbARIIQUksOST8/s1600/p59vhqxfq2.jpg"><br /></a><b>Musica Nuda 55/21</b><br />
Acoustic recording which emphasize acoustic bass and vocal. Great music, although I have a complaint about the album's high frequencies.<br />
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.oOo.</div>
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjr5oPcaWgjuIPkQKlAutlLbp-7XLoMLzvhvYcd1hU10FDKKnvleoG9z_76eD4NspOp_E_83ixr4fxAxJoq-YRBWcbFeeyvleddzD7D77RBURant7eMMoFZgdqSYjnukS31IvqHGkBmisc/s1600/jacky.jpg" style="margin-left: 1em; margin-right: 1em;"><img alt="" border="0" id="BLOGGER_PHOTO_ID_5612332735377467298" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjr5oPcaWgjuIPkQKlAutlLbp-7XLoMLzvhvYcd1hU10FDKKnvleoG9z_76eD4NspOp_E_83ixr4fxAxJoq-YRBWcbFeeyvleddzD7D77RBURant7eMMoFZgdqSYjnukS31IvqHGkBmisc/s320/jacky.jpg" style="display: block; height: 281px; margin-bottom: 10px; margin-left: auto; margin-right: auto; margin-top: 0px; text-align: -webkit-auto; width: 320px;" /></a></div>
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Argentinian recording<br />
<a href="http://www.jacquelinesigaut.com.ar/">http://www.jacquelinesigaut.com.ar</a><br />
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Jacqueline Sigaut is a visceral and expressive artist. Has become an outstanding representative of the new generation of repertoire tango.She proposed new poems and melodies, which are added the classic themes of Tango. Renewed without neglecting the genre's origins with a tribute to the great masters and, through his warm voice and heartfelt interpretation, provides an overview and current female tango.<br />
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<div style="text-align: center;">
.oOo.<br />
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEinKojony6KK4PeYfhN4hOGttYzB-NKXXWuHfapsq2xz2g52ioyzRIgeMQC0IbaOjJLMDD3TejQ0yQUSHU4rgIrdTOI1AtaS8UJfvT0lNvnHPdICtO0ci-I-bfyoBBqjvXL4q-xgOKq-3U/s1600/Gurrumul_-_Skinny_Fish_2008.jpg"><img alt="" border="0" id="BLOGGER_PHOTO_ID_5612334402260134066" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEinKojony6KK4PeYfhN4hOGttYzB-NKXXWuHfapsq2xz2g52ioyzRIgeMQC0IbaOjJLMDD3TejQ0yQUSHU4rgIrdTOI1AtaS8UJfvT0lNvnHPdICtO0ci-I-bfyoBBqjvXL4q-xgOKq-3U/s320/Gurrumul_-_Skinny_Fish_2008.jpg" style="cursor: pointer; display: block; height: 320px; margin: 0px auto 10px; text-align: center; width: 320px;" /></a>Geoffrey Gurrumul Yunupingu (born 1970) is an Indigenous Australian musician, who sings in the Yolngu language. He was born in Galiwin'ku (Elcho Island), off the coast of Arnhem Land, Northern Australia about 350 miles from Darwin. He is from the Gumatj clan of the Yolngu and his mother from the Galpu nation.<br />
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<div style="text-align: center;">
.oOo.</div>
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgsDVqbTWxlM6C8rf7TUDIHFciSXpLuG4ULSXZZqe6PK9wGqOWswmtQk_M90ZDjNuXcAHw3mCFz4bYWmNqjYLAsWJsvRAA0yms7N1rMFZTLQeIZ2xJ3irt5RKg3O7PprWbARIIQUksOST8/s1600/p59vhqxfq2.jpg"><img alt="" border="0" id="BLOGGER_PHOTO_ID_5612394850645153682" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgsDVqbTWxlM6C8rf7TUDIHFciSXpLuG4ULSXZZqe6PK9wGqOWswmtQk_M90ZDjNuXcAHw3mCFz4bYWmNqjYLAsWJsvRAA0yms7N1rMFZTLQeIZ2xJ3irt5RKg3O7PprWbARIIQUksOST8/s320/p59vhqxfq2.jpg" style="cursor: pointer; display: block; height: 300px; margin: 0px auto 10px; text-align: center; width: 300px;" /></a>A recording collaboration between Australian multi-instrumentalist James Morrison and renowned pianist/composer Joe Chindamo, 2x2 is a double disc release that features a selection of repertoire classics mixed with some originals spontaneously arranged and recorded in one session. Disc one has been recorded as a quartet and disc two as a duo.<br />
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<div style="text-align: center;">
.oOo.<br />
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgbSUxgz2mUcAQQuj1lBuD4PxDU6HQhHBQkSI7q6CcLltyBIHG6oG_sdd_jitGf99Sk3bt-8BXRw5ihcJ5BQQXFCI7vi4DmoAtHa9Ck1Cf9UbPdBaVAnWUo_lH8lwCnShD5tOGhVe6RAkg/s1600/ShowImage.aspx.jpeg"><img alt="" border="0" id="BLOGGER_PHOTO_ID_5612396104291292658" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgbSUxgz2mUcAQQuj1lBuD4PxDU6HQhHBQkSI7q6CcLltyBIHG6oG_sdd_jitGf99Sk3bt-8BXRw5ihcJ5BQQXFCI7vi4DmoAtHa9Ck1Cf9UbPdBaVAnWUo_lH8lwCnShD5tOGhVe6RAkg/s320/ShowImage.aspx.jpeg" style="cursor: pointer; display: block; height: 320px; margin: 0px auto 10px; text-align: center; width: 320px;" /></a><br />
With one laptop, 2 microphones and 12 instrumental tunes under his belt, David Ross Macdonald hobo’ed his way across Australia during the bush-fire ravaged summer of 2002 visiting some of the countries finest guitar builders.<br />
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After sitting down with each craftsman for coffee and conversation on all things guitar, Dave set up his microphones in the luthiers kitchens, living rooms or workshops, was handed a freshly minted hand crafted instrument and pressed ‘record’.<br />
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1 month, 12 guitars and 3000 miles later ‘Southern Crossing’ was completed and is an expose and homage to the spirit, craft and musical works of art those luthiers embody in their guitars.<br />
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<div style="text-align: center;">
.oOo.</div>
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</div>
Unknownnoreply@blogger.com0tag:blogger.com,1999:blog-6998112391780171236.post-58532162950917863162010-12-09T06:06:00.000-08:002015-06-24T11:28:15.071-07:00S16 (M, MS, MSXT, MSTi) - Constant Directivity Dipoles<div dir="ltr" style="text-align: left;" trbidi="on">
<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjyyZWu_xhZBPJYyUGD0mKw15CQL31C3_W1fYyXJLXasoWf12o8-YXf1sXSe8ZyjD-Z8k34mx4B5-9JdXpHzNWyGLxk8A51DIZ7CqQpUsQKQ77NNqoWQV-zRRFvnSsxZgpanm4jDxjtcs8/s1600/dsc_5043.jpg"><img alt="" border="0" id="BLOGGER_PHOTO_ID_5563133698175632770" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjyyZWu_xhZBPJYyUGD0mKw15CQL31C3_W1fYyXJLXasoWf12o8-YXf1sXSe8ZyjD-Z8k34mx4B5-9JdXpHzNWyGLxk8A51DIZ7CqQpUsQKQ77NNqoWQV-zRRFvnSsxZgpanm4jDxjtcs8/s400/dsc_5043.jpg" style="cursor: pointer; display: block; height: 266px; margin: 0px auto 10px; text-align: center; width: 400px;" /></a><br />
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The S16 being measured in free space condition.<br />
Roger, Paul, and Daniel are seasoned loudspeaker enthusiasts and builders.</div>
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<span style="color: #666666; font-size: 85%; font-style: italic;">Melbourne 15/1/2011</span></div>
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhj5O3N-VT4HL86uaJ4pfqWDzhuz9rTJ5LfwDPlkRj0CCNhwFMQHIPkuipNBpPoTcOvJ5vcwAlCJROOjoKdyGduTKzgziHuGYa3DvwxVGIrfFAS9t3DtcCpJgRhH3nrlRaAQPzY7S7iEKA/s1600/dsc_4763.jpg"><br /></a>Work in progress to improve high frequency directivity of S12.<br />
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Summary of Midrange and Tweeter variants:<br />
<ul>
<li><b style="color: #ff6600;">S16</b><span style="color: #ff6600;"> </span>- 10/12/10<br />Seas L21, Dayton 10" wg, D220Ti compression driver<br />Also B&C DE250 compression drivers later on</li>
<li><b style="color: #ff6600;">S16/M</b><span style="color: #ff6600;"> </span>- 27/9/11<br />M=Magnesium - Seas W22 woofers</li>
<li><b style="color: #ff6600;">S16/MS</b> - 30/10/11<br />Symmetrical tweeter response - Seas W22, DX25 + Monacor WG300</li>
<li><span style="color: #ff6600; font-weight: bold;">S16/MSXT</span><span style="color: #ff6600;"><span style="color: black;"> - 27/11/11</span></span><br />Replaced DX25 with XT25<br /> </li>
<li> <span style="color: #ff6600; font-weight: bold;">S16/MSTi</span><span style="color: #ff6600;"><span style="color: black;"> - 27/11/11</span></span><br />Replaced XT25 with Vifa DQ25SC16-04</li>
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<span style="font-weight: bold;"><br />Woofers:</span><br />
<span style="font-size: 100%;">Jaycar CW2119</span><br />
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<span style="font-weight: bold;">Crossovers:</span><br />
<span style="font-size: 100%;">- Two MiniDSP 2x4 Kit<br />- Advanced 4-way xo plugin</span><br />
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<span style="font-weight: bold;">Amplifiers:</span><br />
<span style="font-size: 100%;"><a href="http://www.stereo.net.au/forums/showthread.php/29544-Class-D-8-channel-amplifier-build">8-Channel Sure Electronics Class D</a><br /><br />Follow the build discussion at <a href="http://www.diyaudio.com/forums/multi-way/178806-s16-constant-directivity-dipoles.html" style="font-weight: bold;">DIYAudio Forum.</a></span><br />
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<span style="color: #ff6600; font-size: 130%; font-weight: bold;">Measurement Data:</span><br />
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Directivity plot, Native frequency response, 1m:<br />
<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEj7UELAnl9ff389HjNEmVlwkiX_lbY-F6Di4O38r5nZlfopn6AcMG23MYcxWyDZhxI27yuzFm1TZKMAVj2bZp4ZGDHsWdn__8H4LkxFlHUyBb-QBNIPsVIAP5WgSOnq_NvFkwzU-Gy918o/s1600/s16+no+rear+T.png"><img alt="" border="0" id="BLOGGER_PHOTO_ID_5548898211276588498" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEj7UELAnl9ff389HjNEmVlwkiX_lbY-F6Di4O38r5nZlfopn6AcMG23MYcxWyDZhxI27yuzFm1TZKMAVj2bZp4ZGDHsWdn__8H4LkxFlHUyBb-QBNIPsVIAP5WgSOnq_NvFkwzU-Gy918o/s200/s16+no+rear+T.png" style="float: left; height: 100px; margin: 0px 10px 10px 0px; width: 200px;" /></a><br />
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Directivity plot, Normalised to 0deg, 1m:<br />
<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjLhsp9ECki-5voggnSA1yXTpLLuBpk46fKXPqYWNPzxxdQY5yWrk04SJcHFfypggrGd3P5N-JL3mX5wFyLh1m7clGJ7QAjwg3JFrJ1d9Bdtj6KqR69a0rsFPMtKj9Vy6xvLSzV61FRFTU/s1600/rB4mH.png"><img alt="" border="0" id="BLOGGER_PHOTO_ID_5577564935465182114" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjLhsp9ECki-5voggnSA1yXTpLLuBpk46fKXPqYWNPzxxdQY5yWrk04SJcHFfypggrGd3P5N-JL3mX5wFyLh1m7clGJ7QAjwg3JFrJ1d9Bdtj6KqR69a0rsFPMtKj9Vy6xvLSzV61FRFTU/s200/rB4mH.png" style="cursor: pointer; float: left; height: 100px; margin: 0pt 10px 10px 0pt; width: 200px;" /></a><br />
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In-room frequency response (1m ungated), also with reversed tweeter.<br />
<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjPktT6RVPiiv14x5VNjhyphenhyphen0dxyy-1g6QTcQkx84l0BJsn1JLxYX-AVdrklQ5Z3zjtDcWZhIHTnmhN-6Cy8JQC8ZN5Z0vT9IcWPO_d_t20nqsob4aUJdDfO7Wl7Vi6-zGIDBX2uo3Sff-4g/s1600/S16.png"><img alt="" border="0" id="BLOGGER_PHOTO_ID_5588014634029968258" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjPktT6RVPiiv14x5VNjhyphenhyphen0dxyy-1g6QTcQkx84l0BJsn1JLxYX-AVdrklQ5Z3zjtDcWZhIHTnmhN-6Cy8JQC8ZN5Z0vT9IcWPO_d_t20nqsob4aUJdDfO7Wl7Vi6-zGIDBX2uo3Sff-4g/s200/S16.png" style="cursor: pointer; float: left; height: 104px; margin: 0pt 10px 10px 0pt; width: 200px;" /></a><br />
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<span style="color: #ff6600; font-size: 130%; font-weight: bold;">Why the fuss ?</span><br />
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<span style="font-size: 100%;">You can compare the directivity plots above with typical dome tweeter implementation:</span><br />
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S9 OB:<br />
<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiY7yL3Q1vgrbEFyeBpPS0E0dGiV44GCop3t9vnqWD3oAxxFH5z5bWfbIGnV6t27hismQMAljD_JM-B9SJc2GIIt8_C2e5tYEvIXaOEB1ZH5fdX9d1zLCGyjLYXihfdW_AbkCngV8rtB98/s1600/s9+dome+normalised.png"><img alt="" border="0" id="BLOGGER_PHOTO_ID_5563146497458490834" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiY7yL3Q1vgrbEFyeBpPS0E0dGiV44GCop3t9vnqWD3oAxxFH5z5bWfbIGnV6t27hismQMAljD_JM-B9SJc2GIIt8_C2e5tYEvIXaOEB1ZH5fdX9d1zLCGyjLYXihfdW_AbkCngV8rtB98/s200/s9+dome+normalised.png" style="cursor: pointer; float: left; height: 100px; margin: 0pt 10px 10px 0pt; width: 200px;" /></a><br />
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEj3PrxpD64zlIwxgILQHAuUSJb5shy9_xoTYjPL85lLXUDakHUp0DEJjpqXe56_CEJF3q4d2zaOYW9Kg8nm4eLL9IO4a6CppAbislgEKnHPRpAxr-QDze2p1TWENzeC96Do89sSBU_GYX8/s1600/s16msxt.png" style="margin-left: 1em; margin-right: 1em;"><img alt="" border="0" id="BLOGGER_PHOTO_ID_5680926677742475282" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEj3PrxpD64zlIwxgILQHAuUSJb5shy9_xoTYjPL85lLXUDakHUp0DEJjpqXe56_CEJF3q4d2zaOYW9Kg8nm4eLL9IO4a6CppAbislgEKnHPRpAxr-QDze2p1TWENzeC96Do89sSBU_GYX8/s200/s16msxt.png" style="float: left; height: 139px; margin: 0pt 10px 10px 0pt; width: 200px;" /></a></div>
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We see narrowing of loudspeaker polar response, followed by "tweeter blooming". This is an expected response as the tweeters would behave omni-directionally at transition frequency. Humorously known as the "Klingon bird of prey" polar response :)<br />
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Recently a combination of large woofer and waveguide are becoming very popular, similar to the S15 Econowave build. While these types of speakers can provide constant directivity down to 800-1khz, unfortunately they soon transition to omni-directional at lower frequencies:<br />
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S15 DSP:<br />
<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiINpWnl80y1y28hLz9YxG8UOW0PI2Wy6ieaPTl9sFJFjlz3MhUkJiy1mBlfrUsczisOvJ41LAEvsTZ2w4sMboItjwV0w4mKR28tcmwQCbDfpinBUJU8KX2fZZzgTfa4Vd5EgVkuWFmRCc/s1600/s15dsp+normalised.png"><img alt="" border="0" id="BLOGGER_PHOTO_ID_5580185118914302418" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiINpWnl80y1y28hLz9YxG8UOW0PI2Wy6ieaPTl9sFJFjlz3MhUkJiy1mBlfrUsczisOvJ41LAEvsTZ2w4sMboItjwV0w4mKR28tcmwQCbDfpinBUJU8KX2fZZzgTfa4Vd5EgVkuWFmRCc/s200/s15dsp+normalised.png" style="cursor: pointer; float: left; height: 100px; margin: 0pt 10px 10px 0pt; width: 200px;" /></a><br />
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<span style="font-size: 130%; font-weight: bold;"><span style="color: #ff6600;">Observation:</span></span><br />
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<span style="font-size: 100%;">There is a certain correctness about the sound of speakers with such smooth directivity from 20Hz to 20khz. It is immediate and dynamic. However with any loudpeakers they have plus and minuses:</span><br />
<span style="font-weight: bold;">Strength</span>:<br />
<span style="font-size: 100%;">Very dynamic presentation. Willing to play effortlessly at very high SPL. Sound is very 'direct' and make dome tweeters sound diffused in comparison.</span> Very natural.<br />
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<span style="font-weight: bold;">Weakness</span>:<br />
<span style="font-size: 100%;">Lack of rear HF radiation (arguably ok or even necessary), some degree of horn and compression driver coloration make them not as smooth as dome tweeters. Flat d</span>ipole bass is unable to pressurize the room effectively below 40hz, although these can easily be substituted with H or W frame dipole radiators.<br />
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<span style="font-size: 130%; font-weight: bold;"><span style="color: #ff6600;">Room response analysis</span></span><br />
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Elias Perkonen kindly performed <a href="http://www.diyaudio.com/forums/multi-way/164029-wtf-wavelet-transform-audio-measurements-what-how.html">wavelet analysis</a> of the in-room response of these speakers.<br />
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Native frequency response, left and right:<br />
<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiu4knT3YLvbQGq-vshna-Qtkcmqgk_GvcATahkzGVz-RYz-NMnuKp5B-juqRq8XcmAWYsfwqbDcfoIU8JyuNQqgwf2oeKPHnr1-amZDeXhO_XfTww6EV_5ArE0ph2fqHTZEcxlgpSqMCQ/s1600/gainphile_dipole_room_right.png"><img alt="" border="0" id="BLOGGER_PHOTO_ID_5577567411943159266" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiu4knT3YLvbQGq-vshna-Qtkcmqgk_GvcATahkzGVz-RYz-NMnuKp5B-juqRq8XcmAWYsfwqbDcfoIU8JyuNQqgwf2oeKPHnr1-amZDeXhO_XfTww6EV_5ArE0ph2fqHTZEcxlgpSqMCQ/s200/gainphile_dipole_room_right.png" style="cursor: pointer; float: left; height: 120px; margin: 0pt 10px 10px 0pt; width: 200px;" /></a><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhBP4ZNI0oSLiZsLQ98iaujoux4uV8YNbinGoeePxdIUce_NzkckZ1k7P_4TEE3SJ5zY9fg_2bQrUDHOHVeteWKDWrM7zv8WrgQDoQrzYnWxuqT252TE4Gnqhb_jceYoM9H4rStqs6QN7w/s1600/gainphile_dipole_room_left.png"><img alt="" border="0" id="BLOGGER_PHOTO_ID_5577567409742057458" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhBP4ZNI0oSLiZsLQ98iaujoux4uV8YNbinGoeePxdIUce_NzkckZ1k7P_4TEE3SJ5zY9fg_2bQrUDHOHVeteWKDWrM7zv8WrgQDoQrzYnWxuqT252TE4Gnqhb_jceYoM9H4rStqs6QN7w/s200/gainphile_dipole_room_left.png" style="cursor: pointer; float: left; height: 120px; margin: 0pt 10px 10px 0pt; width: 200px;" /></a><br />
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Normalised, left and right:<br />
<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgkYoJn8UJawkbgZv_37KmnBvSosjqzaW7faWLd03FdbkUn3gBB7RjAVzcZ5ua5JY92Ctbz2zeaO-LHnRg7w1KfnHtVJCLA_93PXyFhSPT_KjFEi-kyM2JGOpOGCPPNvBAF23l7gr6Y0D8/s1600/gainphile_dipole_room_norm_right.PNG"><img alt="" border="0" id="BLOGGER_PHOTO_ID_5577568710023818706" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgkYoJn8UJawkbgZv_37KmnBvSosjqzaW7faWLd03FdbkUn3gBB7RjAVzcZ5ua5JY92Ctbz2zeaO-LHnRg7w1KfnHtVJCLA_93PXyFhSPT_KjFEi-kyM2JGOpOGCPPNvBAF23l7gr6Y0D8/s200/gainphile_dipole_room_norm_right.PNG" style="cursor: pointer; float: left; height: 120px; margin: 0pt 10px 10px 0pt; width: 200px;" /></a><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgplx4_ZL4VAGweHGa-wUZSNP5tZNx_EaFCCBsRDa_kcu4zmBHl1YPPIjiWJgJBtsHZAGmERJFcCOO21aKHrGuk1N2GnOIywDS5Rk_oodpRbvTehme1bmFequkfnK7sntJR1K-z5AvaPl8/s1600/gainphile_dipole_room_norm_left.PNG"><img alt="" border="0" id="BLOGGER_PHOTO_ID_5577568707930188018" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgplx4_ZL4VAGweHGa-wUZSNP5tZNx_EaFCCBsRDa_kcu4zmBHl1YPPIjiWJgJBtsHZAGmERJFcCOO21aKHrGuk1N2GnOIywDS5Rk_oodpRbvTehme1bmFequkfnK7sntJR1K-z5AvaPl8/s200/gainphile_dipole_room_norm_left.PNG" style="cursor: pointer; float: left; height: 120px; margin: 0pt 10px 10px 0pt; width: 200px;" /></a><br />
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Longer time windows, 150ms and 300ms:<br />
<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEitZTSt8nUoKIdWuYO6HPAPQ9TmJqCx8fk1085JZvhK5M-PTb5AIBBo9LW-tVLDHcvo99EEOGnNx3l65_DnbZmnYiMSh8xuZjvUF1vPlQer_RC5TSv0tK5BRcmu-SIuz73JNQCGCL-4FiM/s1600/gainphile_dipole_room_norm_right_150ms_20dB.PNG"><img alt="" border="0" id="BLOGGER_PHOTO_ID_5577569615217337122" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEitZTSt8nUoKIdWuYO6HPAPQ9TmJqCx8fk1085JZvhK5M-PTb5AIBBo9LW-tVLDHcvo99EEOGnNx3l65_DnbZmnYiMSh8xuZjvUF1vPlQer_RC5TSv0tK5BRcmu-SIuz73JNQCGCL-4FiM/s200/gainphile_dipole_room_norm_right_150ms_20dB.PNG" style="cursor: pointer; float: left; height: 120px; margin: 0pt 10px 10px 0pt; width: 200px;" /></a><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEj8qJ_L4JWHYXJA9fbgNWxRIJN44BgbDd9dCZr19rT_APFeh-v60p3o6WMmbB-jKt7F4IvgBLuMlCCOPMZDUC-o7KkEu0C6gMesqjRw2Q8A4-ohV66RKqX1pwLb6zk2JWok-pHCEPMOeSw/s1600/gainphile_dipole_room_norm_right_300ms.PNG"><img alt="" border="0" id="BLOGGER_PHOTO_ID_5577569620626320898" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEj8qJ_L4JWHYXJA9fbgNWxRIJN44BgbDd9dCZr19rT_APFeh-v60p3o6WMmbB-jKt7F4IvgBLuMlCCOPMZDUC-o7KkEu0C6gMesqjRw2Q8A4-ohV66RKqX1pwLb6zk2JWok-pHCEPMOeSw/s200/gainphile_dipole_room_norm_right_300ms.PNG" style="cursor: pointer; float: left; height: 126px; margin: 0pt 10px 10px 0pt; width: 200px;" /></a><br />
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As comparison, here are the bark wavelets of Elias' <span style="color: #ff6600; font-weight: bold;">Dipole Line Array</span>, 20ms and 150ms:<br />
<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEi7B9Z6IVOQ1HnWBPDk_BjKkk15jX3Ra2JgkgXdmOieqKKHaXHSSnkrBemGGzwKLCn4ZX6bcTeN8y0gdqSBJa2HgX5XONgWtvFH2928RUiUjxVttO3hTLErDBGP7l7QQEJAclmAi12X5x0/s1600/ARN-linja_2m5_norm_bark_20ms.PNG"><img alt="" border="0" id="BLOGGER_PHOTO_ID_5596838280309695458" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEi7B9Z6IVOQ1HnWBPDk_BjKkk15jX3Ra2JgkgXdmOieqKKHaXHSSnkrBemGGzwKLCn4ZX6bcTeN8y0gdqSBJa2HgX5XONgWtvFH2928RUiUjxVttO3hTLErDBGP7l7QQEJAclmAi12X5x0/s200/ARN-linja_2m5_norm_bark_20ms.PNG" style="cursor: pointer; float: left; height: 120px; margin: 0pt 10px 10px 0pt; width: 200px;" /></a><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhtWfN-m9YmRmno4gUUjc0-FV8VlAQKt9bLvYP8AS__tT-QK_GCfTkL2caH0oK3HnX3TPqRs4hBXqVG6FXz9vwamOBSyo_lI3k4o7oMj8tXSgqnUg_e8c3oRTPcs_MRCf0eRheywLztUis/s1600/12C_2m5_norm_bark_150ms_20dB.PNG"><img alt="" border="0" id="BLOGGER_PHOTO_ID_5596838277946763810" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhtWfN-m9YmRmno4gUUjc0-FV8VlAQKt9bLvYP8AS__tT-QK_GCfTkL2caH0oK3HnX3TPqRs4hBXqVG6FXz9vwamOBSyo_lI3k4o7oMj8tXSgqnUg_e8c3oRTPcs_MRCf0eRheywLztUis/s200/12C_2m5_norm_bark_150ms_20dB.PNG" style="cursor: pointer; float: left; height: 120px; margin: 0pt 10px 10px 0pt; width: 200px;" /></a><br />
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<span style="font-weight: bold;">Update 21/5/2011</span><br />
ps. no rapture yet!<br />
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Tried Selenium D220Ti compression drivers with B&C DE250. These drivers use Poly cone material and have a smooth but 'mellow' sound. Read about my burst signal test investigation <a href="http://www.diyaudio.com/forums/multi-way/189649-d220ti-vs-de250-tone-burst-showdown.html">here</a>. (note: update 22/9/11, I prefer the cheaper D220Ti as a more accurate transducer).<br />
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The polar response is excellent and comparable to D220Ti although mounting adapters have to be used.<br />
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjV81EKY-FOrekqOPf0pgOIkgpB9C_ZEH5Wrl-tbwynJUch3HF_R-N8nGucEzIqLd_vsajjaHleu6pRZG8pWz0it1jc_HgjKidZng761vE5Mf1d5a9gfK89OHJvKJgzvZre9sbqNVARq0s/s1600/s16de250.png"><img alt="" border="0" id="BLOGGER_PHOTO_ID_5609152138173324482" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjV81EKY-FOrekqOPf0pgOIkgpB9C_ZEH5Wrl-tbwynJUch3HF_R-N8nGucEzIqLd_vsajjaHleu6pRZG8pWz0it1jc_HgjKidZng761vE5Mf1d5a9gfK89OHJvKJgzvZre9sbqNVARq0s/s200/s16de250.png" style="cursor: pointer; float: left; height: 105px; margin: 0pt 10px 10px 0pt; width: 200px;" /></a><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhnyClo9Or49-TJmUmYqD1pfB9URsIYWPWwDTJX21emeYO3Md6w8h-Vc_NSZf_JXQcosh2GlildILWohaSbijvPNdY9-BhymcB0ZOYfCri9e-ksV6aHOKX8VXM8cnFOGLbkeuC_2HZMlgU/s1600/Clipboard01.png"><img alt="" border="0" id="BLOGGER_PHOTO_ID_5609499084328197490" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhnyClo9Or49-TJmUmYqD1pfB9URsIYWPWwDTJX21emeYO3Md6w8h-Vc_NSZf_JXQcosh2GlildILWohaSbijvPNdY9-BhymcB0ZOYfCri9e-ksV6aHOKX8VXM8cnFOGLbkeuC_2HZMlgU/s200/Clipboard01.png" style="cursor: pointer; float: left; height: 103px; margin: 0pt 10px 10px 0pt; width: 200px;" /></a><br />
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<span style="font-weight: bold;">Update 27/9/2011</span><br />
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<span style="color: #ff6600; font-size: 130%; font-weight: bold;">S16/M</span><br />
Replaced L21RNX/P with Seas Excel W22, Magnesium cone<br />
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjP-r0FRFnNLndqZ6jBUOTirSYOB8PSYHeiMKWdGp08rayD647v7e_a8mGhMud_IATu4zPeLqzfzZYyAJ6MW8TB-l7qkxuC5g1Rpw4PeMvPUnomXyPT6hizhLagRe1oZG4IBx8ySF6E3eE/s1600/DSC_7790.jpg"><img alt="" border="0" id="BLOGGER_PHOTO_ID_5657284823062226546" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjP-r0FRFnNLndqZ6jBUOTirSYOB8PSYHeiMKWdGp08rayD647v7e_a8mGhMud_IATu4zPeLqzfzZYyAJ6MW8TB-l7qkxuC5g1Rpw4PeMvPUnomXyPT6hizhLagRe1oZG4IBx8ySF6E3eE/s200/DSC_7790.jpg" style="cursor: pointer; float: left; height: 133px; margin: 0pt 10px 10px 0pt; width: 200px;" /></a><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgJP6wcP-tqrfhhvjBnc6MxWjxeKB4sIphxkyxt1jJwLMo1DqELBMz90_l685Q6AiARyWhwZOkyYiWMlEFq94YRPq0SIMjTXyi19rnbo0gXg4F1mr-u76VwYc0LyRgr4CoPCvHYjPpMlAg/s1600/DSC_7789.jpg"><img alt="" border="0" id="BLOGGER_PHOTO_ID_5657284596099891186" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgJP6wcP-tqrfhhvjBnc6MxWjxeKB4sIphxkyxt1jJwLMo1DqELBMz90_l685Q6AiARyWhwZOkyYiWMlEFq94YRPq0SIMjTXyi19rnbo0gXg4F1mr-u76VwYc0LyRgr4CoPCvHYjPpMlAg/s200/DSC_7789.jpg" style="cursor: pointer; float: left; height: 133px; margin: 0pt 10px 10px 0pt; width: 200px;" /></a><br />
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEg9OgjHMZZZvQNdIoTRsLR0nDQGrtcm2CnichjaujWC5xyjpGWomUAXkQdMH1Xfcd3XSy2bm9wQ9q0h5YEXhtIvIrXiAIvsz0ClS1CcRTwsR1ShkL0NfZkCoXWPlRu8hBogSF3Fenfm0Ds/s1600/DSC_7788R.jpg"><img alt="" border="0" id="BLOGGER_PHOTO_ID_5657284202350551346" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEg9OgjHMZZZvQNdIoTRsLR0nDQGrtcm2CnichjaujWC5xyjpGWomUAXkQdMH1Xfcd3XSy2bm9wQ9q0h5YEXhtIvIrXiAIvsz0ClS1CcRTwsR1ShkL0NfZkCoXWPlRu8hBogSF3Fenfm0Ds/s200/DSC_7788R.jpg" style="cursor: pointer; float: left; height: 200px; margin: 0pt 10px 10px 0pt; width: 162px;" /></a><br />
The Excels are interesting. When I tap the cone interestingly they don't sound like typical metal drivers. They sound like polycones! Magnesium are lighter than aluminium and apparently Seas were able to make a thicker cone for the same weight, providing better damping.<br />
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Replacing the Aluminium L21RNX/P there were only 2 differences. The cone resonance peak (W22 is about 100hz higher) and region between 1khz-2khz. Frequency response-wise they track within 1-2db. It was also interesting to note the behaviour of the resonance. It's different. The Aluminium has periodic resonance after the main one, while W22 has only one major peak and drops after that. Both L21 and W22 have serious drop about 2khz and really the 1.5khz XO is really pushing it.<br />
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<b><span class="Apple-style-span">Sonics of S16/M</span></b><br />
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Now, after only minor adjustment, which is the metal cone notch I sat down and listen.... Tonally they are inseparable. They sounded very much the same. However the Excel have this specific character that is quite difficult to explain. Basically it sounded mellow and laid back, but with resolution and transparency. It projects refinement and practically makes any music with overtones sounds......beautiful?? They reminded me of the Orions.<br />
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I think, however that the Excels are lacking the gusto and immediate transients of the Aluminium L21 especially playing percussive instruments.<br />
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<span style="font-weight: bold;">6/10/2011</span><br />
Interesting approach to solve dipole tweeter directivity <a href="http://www.diyaudio.com/forums/multi-way/178806-s16-constant-directivity-dipoles-10.html#post2735848">by roflynn</a>. Using Scanspeak tweeters and Monacor Waveguide WG300<br />
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhRSBNJ0pEqOXzqSjs6McAiySiXclNj4RSCUwOgu3INJOU9A7MSTjq9i9gdl6jdkqX_UbYYtOPQoSrmFu7CqjLXkhWZ4XRegO5smCFxQygoCEfXCdPkzE0mYJ_4DYIwoncI0rwsuMqykhg/s1600/dome+dipole+tw.jpg"><img alt="" border="0" id="BLOGGER_PHOTO_ID_5667200097487117314" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhRSBNJ0pEqOXzqSjs6McAiySiXclNj4RSCUwOgu3INJOU9A7MSTjq9i9gdl6jdkqX_UbYYtOPQoSrmFu7CqjLXkhWZ4XRegO5smCFxQygoCEfXCdPkzE0mYJ_4DYIwoncI0rwsuMqykhg/s200/dome+dipole+tw.jpg" style="cursor: pointer; height: 117px; width: 200px;" /></a><br />
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<span style="font-weight: bold;">30/10/11</span><br />
<span style="color: #ff6600; font-size: 130%;"><span style="font-weight: bold;">S16/MS</span></span><br />
Building the 16/MS (magnesium, symmetrical)<br />
The objective is to provide front-rear controlled directivity of tweeter region, with symmetry. This was not able to be done with Waveguide/compression driver combination.<br />
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To the rescue is Vifa DX25 loaded with Monacor WG300. The dispersion is respectable (not as good as 16/M) but more importantly the small dimension allows back-to-back setup.<br />
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEibFWSQgCiHHGbMepAKpNufV4dsI9qiO0ymOKrfR2YH_hIHizLbED0XJ35btyqEJzxf4KPlcSkwp7xFzhN0fYbv3R6FxgEzCjCLYs2YsayiiNO_Zwx3JmaTiYHu-xUqMePXDo3KQ-ztkt4/s1600/s16ms.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="200" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEibFWSQgCiHHGbMepAKpNufV4dsI9qiO0ymOKrfR2YH_hIHizLbED0XJ35btyqEJzxf4KPlcSkwp7xFzhN0fYbv3R6FxgEzCjCLYs2YsayiiNO_Zwx3JmaTiYHu-xUqMePXDo3KQ-ztkt4/s200/s16ms.jpg" width="141" /></a><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEg_1bwWjFVBf19cYl6Xtl2crKdFtnqZLkhP0ErXacUYAzjMDqRvqJ2vWHumW4pUGgZ_0JzVTKY7HjPCAcCsuk0HGDagpsnvQ8cN5V2CskBit3UzgYgp41BbMRub8x90sI5R1Y0V0K5Dvg0/s1600/s16ms2.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="200" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEg_1bwWjFVBf19cYl6Xtl2crKdFtnqZLkhP0ErXacUYAzjMDqRvqJ2vWHumW4pUGgZ_0JzVTKY7HjPCAcCsuk0HGDagpsnvQ8cN5V2CskBit3UzgYgp41BbMRub8x90sI5R1Y0V0K5Dvg0/s200/s16ms2.jpg" width="156" /></a></div>
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The polar response is not as smooth as large waveguide in S16, but it is sufficient to match dipole's directivity of -6db @60deg. When moving around the speakers I could hear the level drops uniformly. It is the best compromise so far between directivity and front-rear symmetry.<br />
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0-90deg, 10deg increment, normalised.<br />
<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhp5AVNE52TcMKYeCNAKL68AIeQaJ2T3ztUIy-z2S5Eg7hfDuy_ryLTQzkt5Zo6QuvNSGbaqoY_IGsjEEGOZeo9WyptThrtWCKNFEPLiVNDYCkrYtLRPrTUxfDjM_liRa8yARjlzPlq5TQ/s1600/DX25-WG300.png"><img alt="" border="0" id="BLOGGER_PHOTO_ID_5670760534161866866" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhp5AVNE52TcMKYeCNAKL68AIeQaJ2T3ztUIy-z2S5Eg7hfDuy_ryLTQzkt5Zo6QuvNSGbaqoY_IGsjEEGOZeo9WyptThrtWCKNFEPLiVNDYCkrYtLRPrTUxfDjM_liRa8yARjlzPlq5TQ/s200/DX25-WG300.png" style="cursor: pointer; height: 100px; width: 200px;" /></a><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhlN6Qx1qwXkmuHdo7uMoEWsOtrsxmAFCosn2EnpT_pgi5P0S4kC2SRD0-EXhLs6ioDRHvC-Lb_C2e46-gMdXo-3SylqrBmCTCxHLfmkK_pr1KqKx2e9ymTV4G5H1PZwhJIV9USoCRaG3E/s1600/DX25-WG300wf.png"><img alt="" border="0" id="BLOGGER_PHOTO_ID_5670760544223132226" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhlN6Qx1qwXkmuHdo7uMoEWsOtrsxmAFCosn2EnpT_pgi5P0S4kC2SRD0-EXhLs6ioDRHvC-Lb_C2e46-gMdXo-3SylqrBmCTCxHLfmkK_pr1KqKx2e9ymTV4G5H1PZwhJIV9USoCRaG3E/s200/DX25-WG300wf.png" style="cursor: pointer; height: 99px; width: 200px;" /></a><br />
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<span style="font-weight: bold;">27/11/11</span><br />
<span style="color: #ff6600; font-weight: bold;">S16/MSXT</span><br />
Replaced DX25 with XT25 ring radiator. The benefit is elimination of 12khz null thanks to the phase plug. This version was shown at Melbourne <a href="http://www.stereo.net.au/forums/showthread.php/38240-GTG-Melbourne-audio-round-trip-%28November%29?p=621636&viewfull=1#post621636">round-trip GTG</a>.<br />
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjXvPHrT0Ay4qTrLdrzSIZsRVV7uqk1xl_bGH5DokIBLNlsDI1EERORhVybdADQTTifkHFjQc2jkn2UgjcFIWeUwT6C15_RJBAbWZhgezqjylHM1XIhqsSVP57LIabrF_yu1kA_r1nehjQ/s1600/andi1.jpg"><img alt="" border="0" id="BLOGGER_PHOTO_ID_5679640124533728946" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjXvPHrT0Ay4qTrLdrzSIZsRVV7uqk1xl_bGH5DokIBLNlsDI1EERORhVybdADQTTifkHFjQc2jkn2UgjcFIWeUwT6C15_RJBAbWZhgezqjylHM1XIhqsSVP57LIabrF_yu1kA_r1nehjQ/s200/andi1.jpg" style="cursor: pointer; float: left; height: 132px; margin: 0pt 10px 10px 0pt; width: 200px;" /></a><br />
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Deep reverse null showing excellent time alignment and phase tracking. Also displayed is the difference between DX25 and XT25 when loaded with the waveguide. The lack of phase plug caused ~12khz null with DX25.<br />
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhuPnG5qs3EsNWti2zSui6cP9lDPtg3iF0BsUywbZA-_kBxC-nP0V0olMIj-7FQVzsHT__T-1a5MyV2OqD7EgeuXpIA4mnJGXlpBFQU-ttbCfcMnhtvU34Y7lv1W80vxzDh7Uqd3jjncO4/s1600/DX25vsXT25.png" style="clear: left; float: left; margin-bottom: 1em; margin-right: 1em;"></a><a href="http://4.bp.blogspot.com/-1pzXvZFSPlg/Tvr5_VtR-tI/AAAAAAAAGxA/fP0aD4QPgfw/s1600/s16msxt.png" imageanchor="1" style="clear: right; float: right; margin-bottom: 1em; margin-left: 1em;"><img border="0" height="138" src="http://4.bp.blogspot.com/-1pzXvZFSPlg/Tvr5_VtR-tI/AAAAAAAAGxA/fP0aD4QPgfw/s200/s16msxt.png" width="200" /></a><img alt="" border="0" id="BLOGGER_PHOTO_ID_5680928006271110178" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhuPnG5qs3EsNWti2zSui6cP9lDPtg3iF0BsUywbZA-_kBxC-nP0V0olMIj-7FQVzsHT__T-1a5MyV2OqD7EgeuXpIA4mnJGXlpBFQU-ttbCfcMnhtvU34Y7lv1W80vxzDh7Uqd3jjncO4/s200/DX25vsXT25.png" style="float: left; height: 162px; margin: 0pt 10px 10px 0pt; width: 200px;" /></div>
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28/12/2011<br />
<div style="color: orange;">
<span style="color: #ff6600; font-weight: bold;">S16/MSTi</span></div>
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I wanted better HF resolution which only rigid/metal dome tweeters can provide. A quick experiment mounting a Titanium domeVifa DQ25SC16-04 to the Monacor waveguide resulted in good result. I <a href="http://www.diyaudio.com/forums/multi-way/190417-vifa-dq25-phase-shield-removal-surgery.html">removed the phase plug</a> of these drivers.<br />
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<a href="http://3.bp.blogspot.com/-l3gkzGi6_OE/Tvr1LoJE_qI/AAAAAAAAGwg/0GkpDZOi-og/s1600/DSC_9451.jpg" imageanchor="1" style="clear: left; float: left; margin-bottom: 1em; margin-right: 1em;"><img border="0" height="132" src="http://3.bp.blogspot.com/-l3gkzGi6_OE/Tvr1LoJE_qI/AAAAAAAAGwg/0GkpDZOi-og/s200/DSC_9451.jpg" width="200" /></a></div>
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<a href="http://3.bp.blogspot.com/-X7iReTuJQh4/Tvr1KSclQwI/AAAAAAAAGwY/IO0uJhmMzGs/s1600/DQ25-WG300+raw+and+eq.png" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="131" src="http://3.bp.blogspot.com/-X7iReTuJQh4/Tvr1KSclQwI/AAAAAAAAGwY/IO0uJhmMzGs/s200/DQ25-WG300+raw+and+eq.png" width="200" /></a><a href="http://2.bp.blogspot.com/-UFY3UJwgjVA/Tvr1MeiIoqI/AAAAAAAAGwo/yIZ8-Zmp2To/s1600/Tweeter+reversed.png" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="131" src="http://2.bp.blogspot.com/-UFY3UJwgjVA/Tvr1MeiIoqI/AAAAAAAAGwo/yIZ8-Zmp2To/s200/Tweeter+reversed.png" width="200" /></a></div>
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When loaded with the waveguide a 10+dB peak appears. This is excellent as we can notch this peak and resulted in lower distorion (distortion figures of these drivers are already excellent). It also resulted in excellent phase tracking, despite the non-matching diameter between waveguide throat and the dome. To my surprise the lack of phase plug does not exhibit a dip in the response (that 18khz dip is inherent to the driver).<br />
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<a href="http://2.bp.blogspot.com/-aHdFrCFx3no/Tvr43nBcFkI/AAAAAAAAGw0/0TGj8ZMmIfA/s1600/DQ25-1.png" imageanchor="1" style="clear: left; float: left; margin-bottom: 1em; margin-right: 1em;"><img border="0" height="129" src="http://2.bp.blogspot.com/-aHdFrCFx3no/Tvr43nBcFkI/AAAAAAAAGw0/0TGj8ZMmIfA/s200/DQ25-1.png" width="200" /></a></div>
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The smallish waveguide loses directivity at 2khz. The polar response is not as good as a proper 10" waveguide, but definitely much better than normal dome tweeter on a baffle. <br />
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I prefer the sonics of these drivers compared to XT25 and earlier DX25. They are very transparent and detailed. YMMV. (Update 8/1/2012: They are not nice visually. The dome is light-reflective and draws attention. I liked the black XT25 better and have reinstalled them). <br />
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<b>Update 7/2/2012</b><br />
Experimentation with Linkwitzlab "Watson"<br />
<a href="http://www.diyaudio.com/forums/multi-way/206083-linkwitzlab-watson.html">http://www.diyaudio.com/forums/multi-way/206083-linkwitzlab-watson.html</a><br />
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgk55ois4Mwc3D2c2NRrks-TuIOiFtNXVGh6b9Il3D3-3kTVPbFjY1fI4VYaFJbqU96WPqveHsXLRKqe6IUiQAOjTUFBe0_vCMxPJCUkZtNm-YrXZu6LCb6HSOPM3Dfc0_8z486owR93N8/s1600/IMGP3296.jpg" imageanchor="1" style="clear: left; float: left; margin-bottom: 1em; margin-right: 1em;"><img border="0" height="150" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgk55ois4Mwc3D2c2NRrks-TuIOiFtNXVGh6b9Il3D3-3kTVPbFjY1fI4VYaFJbqU96WPqveHsXLRKqe6IUiQAOjTUFBe0_vCMxPJCUkZtNm-YrXZu6LCb6HSOPM3Dfc0_8z486owR93N8/s200/IMGP3296.jpg" width="200" /></a></div>
<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiSOEtM7kGHvzGLUHYVmXznFqzIQpG07NeEBbDVaNM3fwOdRjUicDc9r2YIpb_oZuDLxhFwQx135gSalWFCjzLEl5L1_xMjK-wBKS-9mWuoAhqiyKAG7QreM0LKBnPEoFzwDePjGb41b4c/s1600/IMGP3304.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="150" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiSOEtM7kGHvzGLUHYVmXznFqzIQpG07NeEBbDVaNM3fwOdRjUicDc9r2YIpb_oZuDLxhFwQx135gSalWFCjzLEl5L1_xMjK-wBKS-9mWuoAhqiyKAG7QreM0LKBnPEoFzwDePjGb41b4c/s200/IMGP3304.jpg" width="200" /></a><br />
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rich31td's build:<br />
<a href="http://www.diyaudio.com/forums/multi-way/223425-open-baffle-natural-roll-off-3.html#post3240369">http://www.diyaudio.com/forums/multi-way/223425-open-baffle-natural-roll-off-3.html#post3240369</a><br />
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<b>Update 31/1/2015</b><br />
A 'released' build of this prototype is being commissioned: <a href="http://gainphile.blogspot.com.au/2015/01/r16-constant-directivity-loudspeakers.html">Gainphile R16</a><br />
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEg9hH9EZZsLKTkJRHr8Ufx0stSp6pypov1L9wPKQm6eFSh4Bc6Djz6MaB8LF6mamqbDclSHSu4WI3BO1ZBNccjoTNpq4e9pSz1lSZEqYy7KxkPJ1rh_MVnNL30V4-VLtv-sktJMLBa_CaY/s1600/S16+rear+T.jpg"></a> </div>
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Unknownnoreply@blogger.com14tag:blogger.com,1999:blog-6998112391780171236.post-13006098423841418202010-11-12T19:37:00.000-08:002016-06-18T17:14:37.446-07:00S15 - Econowave DSP<div dir="ltr" style="text-align: left;" trbidi="on">
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhOaZ-wm8DKUTsFZ8MrKgYbk2WNQNd3YYburTv2EYEbh4hpshyphenhyphen935aiBO9lUkEXyAjy3VlCjVjV5DPbXDg4O_mdqFlFiad6viW9eBK_Sb9lKw6iVqyglCcC52FrIvmuup28v2m_K2iCJkM/s1600/Clipboard01.jpg"></a><br />
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<a href="http://1.bp.blogspot.com/-nNotDbfRFWY/TveqjAWyabI/AAAAAAAAGwM/YWyA_xV7Jxw/s1600/s15.png" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"></a></div>
<img alt="" border="0" id="BLOGGER_PHOTO_ID_5621597895030513634" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhOaZ-wm8DKUTsFZ8MrKgYbk2WNQNd3YYburTv2EYEbh4hpshyphenhyphen935aiBO9lUkEXyAjy3VlCjVjV5DPbXDg4O_mdqFlFiad6viW9eBK_Sb9lKw6iVqyglCcC52FrIvmuup28v2m_K2iCJkM/s400/Clipboard01.jpg" style="cursor: pointer; display: block; height: 266px; margin: 0px auto 10px; text-align: center; width: 400px;" /><span style="font-size: small;"><span style="font-style: italic;">The Original S15 Econowave DSP</span></span><span style="font-size: small;"><span style="font-style: italic;"> </span></span><br />
<span style="font-size: small;"><span style="font-style: italic;">Eminence Beta 12a</span></span><span style="font-size: small;"><span style="font-style: italic;"> + Selenium D220Ti & Pyle WG</span> </span><br />
<span style="font-size: small;">(C1-W1-CD1)<span style="font-style: italic;"><br /></span></span><br />
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Econowave is a cost effective <i>controlled</i><span style="font-style: italic;">-directivity</span> loudspeaker design. DIY folks at <a href="http://audiokarma.org/forums/showthread.php?t=150939">AudioKarma</a> had investigated numerous driver + waveguide combination which would achieve the optimum polar response using off-the-shelf products.<br />
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Note: You could get lost in the thousands of posts in AudioKarma. But here's my refence links which summarise the variations of the designs: <a href="http://audiokarma.org/forums/showthread.php?p=1856214#post1856214">AudioKarma</a> and <a href="http://techtalk.parts-express.com/showthread.php?215536-Flex-Your-PCD-Mettle">TechTalk</a><br />
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<div style="text-align: left;">
For this DSP build, follow my post in <a href="http://www.audiokarma.org/forums/showthread.php?t=332678">AudioKarma</a> and <a href="http://www.diyaudio.com/forums/multi-way/179800-s15-econowave-dsp-constant-directivity-vs-dipole-study.html">DIYAudio</a> forums.</div>
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<span style="color: #ff6600; font-size: 130%; font-weight: bold;">Specifications</span><br />
Topology: Active 2-way with pro-woofers and compression drivers<br />
Radiation pattern: Monopole - Controlled Horizontal Directivity<br />
Directivity: Omni-directional at lower frequencies, smooth transition to 90 deg beam at 1.2khz <br />
Frequency response: 20hz - 17khz. Critically damped LF Q of 0.5<br />
Sensititivity: ~92dB<br />
Dimension (H, W, D): 57 x 37 x 33cm<br />
Vertical lobe (Listening position) : Tweeter axis, toe'd in 5-10deg <br />
Amplifiers: 4-Channels required (2x stereo amps) <br />
Crossover: DSP (<a href="http://www.minidsp.com/onlinestore/detail/7-minidsp-kits/flypage/40-minidsp-kit?sef=hcfp">MiniDSP</a> + <a href="http://www.minidsp.com/onlinestore/detail/13-audio-plug-ins/flypage/59-2way-advanced?sef=hcfp">2way Advanced Plugin</a>) <br />
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhFANcQEfEw_lG51QOzM9w1ETv4jrU9I2zbRcqaof1tiJ4IlpKzNBHFxqabLzRypDJSravhO4Aa6CtaVqfqd7VSH6Tu5O3UALmFCVIz5l1v-OaVV8-ELklVZRhxJvST83cRH1l0QRr132I/s1600/biamp.png" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="87" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhFANcQEfEw_lG51QOzM9w1ETv4jrU9I2zbRcqaof1tiJ4IlpKzNBHFxqabLzRypDJSravhO4Aa6CtaVqfqd7VSH6Tu5O3UALmFCVIz5l1v-OaVV8-ELklVZRhxJvST83cRH1l0QRr132I/s320/biamp.png" width="320" /></a></div>
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<span style="color: #ff6600; font-size: 130%; font-weight: bold;">Cabinet construction</span><br />
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The cabinet is basically made from 33cm, 18mm MDF cutouts. The offcuts are<a href="http://i.imgur.com/Lnw65.jpg"> glued into the inside panels</a> to provide additional strength and rigidity. The finished speakers are very heavy.<br />
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Cabinet C1 </div>
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhleMPbCtuTpH51EMsQlnENTatiQ7rHT3rAxgpUdf4AqnLRakVV9TsG_Coov5UnpqzgW_nWpZeq8WoT1Z-3oY4bGiyKwTWjK2nJ7Bf5FGA-jUJYl09R5WGZvN25GWWQC0pokz9wA98d7zM/s1600/s15r.png" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="162" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhleMPbCtuTpH51EMsQlnENTatiQ7rHT3rAxgpUdf4AqnLRakVV9TsG_Coov5UnpqzgW_nWpZeq8WoT1Z-3oY4bGiyKwTWjK2nJ7Bf5FGA-jUJYl09R5WGZvN25GWWQC0pokz9wA98d7zM/s200/s15r.png" width="200" /></a></div>
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Cabinet C2<br />
(future design ...)</div>
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A handsaw was used and could not provide precise cuts. Hence the construction can be made <a href="http://i.imgur.com/H7R01.jpg">square and flush</a> effectively by ofsetting 0.5mm and <a href="http://i.imgur.com/xdVWQ.jpg">sanding</a>. <br />
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<div style="color: red;">
<b>Stuffing</b></div>
The primary reason for stuffing is to dampen modes inside the box structure. With so much variations on stuffing material (dacron, acousta-stuff, natural wool fibers, etc.) how much stuffing requires some experimentations. I use dacron (those pillow-stuffing) and starts about <a href="https://lh3.googleusercontent.com/-rYLEWoCV-yQ/UFLinv8WDNI/AAAAAAAAIWc/SzbV7u9VA5k/s800/dsc_5535.jpg">this much</a>, very <u>loosely</u> filled. After some listening I <a href="https://picasaweb.google.com/widhibrata/AUDIO#slideshow/5787937634390236066">removed some</a>. The goal is to have enough to reduce the modes, but not too much that it overdamps and reduce the box volume. It is a competing factor.</div>
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<span style="color: #ff6600; font-size: 130%; font-weight: bold;">DSP
Crossover Configurations</span><br />
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The DSP configuration is available below.<br />
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<span style="color: red; font-size: large;">## WARNING #</span><br />
I configured the speakers using an older version of MiniDSP plugin which had a bug in it<br />
<a href="https://www.minidsp.com/forum/software-support/10857-minidsp-4x10-hd-slp-q-biquad-errors">https://www.minidsp.com/forum/software-support/10857-minidsp-4x10-hd-slp-q-biquad-errors</a><br />
The effect is that if you use the newer plugin (which is the fixed one) the bass will sound heavy. So please be aware of it. I will revisit these in the future with the updated plugin.<br />
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Important: do not forget to implement <a href="http://i.imgur.com/PES4J.png">L-PAD</a><span style="color: red;"> </span>for the tweeters.<br />
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<div style="color: red;">
<b>Woofer DSP crossover </b>
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<div style="color: #cc0000;">
Woofer W1: <a href="http://www.parts-express.com/pe/showdetl.cfm?Partnumber=290-408">Eminence Beta 12</a></div>
<div style="color: #cc0000;">
<span style="color: #cc0000;">Cabinet C1</span> </div>
<ul>
<li><a href="http://i.imgur.com/2enp3.png">XO</a>: <span style="color: red; font-size: small;">1250hz, LR2</span><br />Crossover point is chosen by careful consideration of distortion, group delay, power handling, and polar response. See my investigation <a href="http://www.stereo.net.au/forums/index.php?/topic/26314-econowave-looking-for-a-tube-friendly-dynamic-speaker/page__st__270#entry514222">here</a> on dispersion pattern of various xo points.</li>
<li><a href="http://i.imgur.com/z7Eku.png">EQ1</a>: Notch Filter<div style="color: red;">
<span style="font-size: small;">PEAK 618hz / -2.8db / 2.6Q</span></div>
</li>
<li> <a href="http://i.imgur.com/sw9Nw.png">EQ2</a>: Linkwitz Transform Biquad (LT)<br /><a href="http://i.imgur.com/xWxDj.png">LT</a>: Select "Advanced", Copy and paste below, and click "Process".<br /><blockquote class="tr_bq" style="color: red;">
<span style="font-size: x-small;">biquad1,</span><br />
<span style="font-size: x-small;">b0=1.00329685429188,</span><br />
<span style="font-size: x-small;">b1=-1.99470503770825,</span><br />
<span style="font-size: x-small;">b2=0.991546613279961,</span><br />
<span style="font-size: x-small;">a1=1.99477083461872,</span><br />
<span style="font-size: x-small;">a2=-0.99477767066137</span></blockquote>
The woofer is equalised to F3=20hz with critically-damped Q of 0.5. This means -3db@40hz and -6db@20hz. Please note
that these values are driver and cabinet volume-dependent. If you change
the cabinet volume drastically or change the Woofer, then you need to
recalculate and remeasure the transform. No you can't just punch in
factory-provided TS parameters.<br /><br />
Read more about LT Biquad <a href="http://www.linkwitzlab.com/filters.htm#9">here</a> and <a href="http://www.minidsp.com/applications/linkwitz-transform">here</a>,
and also a <a href="http://www.minidsp.com/images/fbfiles/files/All_digital_coefs_v1-20101026.zip">calculator</a>. <br />
<br />
<a href="http://i.imgur.com/Y7muq.png">Raw woofer measurement (nearfield)</a> <br />
<a href="http://i.imgur.com/yx3Qh.png">LT Biquad (simulation)</a><br /><a href="http://i.imgur.com/jwn3N.png">Woofer with LT, Notch, and XO (measured nearfield)</a><br />Green=raw, Black=Equalised woofer, Red=Target frequency response</li>
<li><a href="http://i.imgur.com/W7LjB.png">EQ3</a>: Baffle step compensation<div style="color: red;">
<span style="font-size: small;">HIGH-SHELF 206hz / -6db / 1Q </span></div>
Baffle step consist of shelving highpass with -6db/oct gain. It compensate the transition from 4pi (omni-directional) to 2pi (forward radiating) of box speakers. Read about
baffle step <a href="http://sound.westhost.com/bafflestep.htm">here</a>. <br />
<a href="http://i.imgur.com/Vnjie.png"></a><a href="http://i.imgur.com/Y6USS.png">Woofer response with Baffle Step (measured, nearfield)</a><br /><a href="http://i.imgur.com/4FdGD.png">Woofer response from 1m</a><br />Black=with baffle step</li>
<li>Ignore values of EQ4.. etc. </li>
<li>Attenuation, Phase, and Delay<span class="st"><br /></span><a href="http://i.imgur.com/isMZ0.png">With CD1</a>: <span class="st">Attenuation 0, Polarity <span style="color: red;">NORMAL</span>,
Delay:<span style="color: red; font-size: x-small;"> <span style="font-size: small;">0ms</span></span></span><a href="http://i.imgur.com/72kld.png"><br />With CD2</a>: <span class="st">Attenuation 0, Polarity
<span style="color: red;">NORMAL</span>,
Delay:<span style="color: red; font-size: x-small;"> <span style="font-size: small;">0.06ms</span></span></span></li>
</ul>
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<div style="color: red;">
<b>Tweeter DSP crossover </b></div>
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<div style="color: red;">
<div style="color: #cc0000;">
CD1 (Selenium D220Ti)</div>
<span style="color: black;">Compression driver: <a href="http://www.parts-express.com/pe/showdetl.cfm?Partnumber=264-270">Selenium D220Ti</a> screw-on</span></div>
Waveguide: JBL 1" thread-on Progressive
Transition, Part# 338800-001, or <a href="http://redirectingat.com/?id=1010X497171&url=http%3A%2F%2Fwww.parts-express.com%2Fpe%2Fshowdetl.cfm%3FPartnumber%3D292-2572">Pyle
Pro PH612</a>, or <a href="http://www.parts-express.com/pe/show...number=270-318">Dayton
clone.</a> In Australia: <a href="http://www.djcity.com.au/products/yd...07mm_1025.html">DJCity
YD-L033</a><br />
Directivity pattern measured from 0-90deg, 10deg increments: <br />
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhrN3L2aELTshhKs_2B_CH3tI2O8uyPGXeHXLg2Is41tHlLdWLbp0ykumhS1MC1MN5cZQbKvWHWT3uMtG0qkUTTLZLcR4gx9prlOD5fKAtpRpDst75pp9A-ytjJKF92GgibGD03yjpbBdY/s1600/s15dsp+normalised.png" style="margin-left: 1em; margin-right: 1em;"><img alt="" border="0" id="BLOGGER_PHOTO_ID_5563129628923893650" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhrN3L2aELTshhKs_2B_CH3tI2O8uyPGXeHXLg2Is41tHlLdWLbp0ykumhS1MC1MN5cZQbKvWHWT3uMtG0qkUTTLZLcR4gx9prlOD5fKAtpRpDst75pp9A-ytjJKF92GgibGD03yjpbBdY/s200/s15dsp+normalised.png" style="float: left; height: 100px; margin: 0pt 10px 10px 0pt; width: 200px;" /></a></div>
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<ul>
<li><a href="http://i.imgur.com/2enp3.png">XO</a>: <span style="font-size: small;"><span style="color: red;">1250hz, LR2</span></span></li>
<li><a href="http://i.imgur.com/mA7o0.png">EQ1</a>: Waveguide loading notch<div style="color: red;">
<span style="font-size: small;">PEAK 1956hz / -4.8db / 2.6Q</span></div>
<a href="http://i.imgur.com/Hf5BP.png">Raw and equalised Compression Driver + Waveguide (from 80cm)</a> <br />
Green=raw, black=equalised.</li>
<li>Passive L-PAD<br />Passive L-PAD is used at the compression driver to provide main attenuation for woofer level matching. The benefit is that noise from Amplifier will also be reduced. The remaining few dB is adjusted from MiniDSP.<br /><a href="http://i.imgur.com/PES4J.png">L-PAD</a>: <span style="font-size: small;"><span style="color: red;">-11db using 5.6 </span></span><span class="st" style="color: red; font-size: small;">Ω and 3.3 </span><span class="st"><span style="font-size: small;"><span style="color: red;">Ω 5w resistors</span></span><a href="http://i.imgur.com/7jer7.png"><br /></a><span style="color: red; font-size: small;"></span></span></li>
<li>Attenuation, Phase, and Delay<span class="st"><br /><a href="http://i.imgur.com/7jer7.png">With W1</a>: Attenuation <span style="color: red;">-5db</span>, Polarity <span style="font-size: small;"><span style="color: red;">INVERT</span></span>, Delay:<span style="color: red; font-size: x-small;"> <span style="font-size: small;">0.04ms</span></span><a href="http://i.imgur.com/iuQ7c.png"><br />Measurement from 1m at Tweeter level</a><br />Ignore lower frequencies.</span></li>
</ul>
I have a quick iphone capture of these loudspeakers in youtube:<br />
<a href="http://www.youtube.com/watch?v=SwSK8dmeqgU">http://www.youtube.com/watch?v=SwSK8dmeqgU</a><br />
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<br />
<div style="color: #cc0000;">
CD2 (B&C DE250)</div>
<span style="color: black;">Compression driver: B&C DE250 + <a href="http://www.djcity.com.au/products/th-adaptor-2-x-male-flange-screw-adaptor-_411.html">DJCity adapter</a> (<a href="http://i.imgur.com/ZYode.jpg">photo</a>)</span><br />
<span style="color: black;">The adapter needs to be enlarged to 1 inch, so better ones may be found from PartsExpress.</span><br />
Waveguide: JBL 1" thread-on
Progressive
Transition, Part# 338800-001, or <a href="http://redirectingat.com/?id=1010X497171&url=http%3A%2F%2Fwww.parts-express.com%2Fpe%2Fshowdetl.cfm%3FPartnumber%3D292-2572">Pyle
Pro PH612</a>, or <a href="http://www.parts-express.com/pe/show...number=270-318">Dayton
clone.</a> In Australia: <a href="http://www.djcity.com.au/products/yd...07mm_1025.html">DJCity
YD-L033</a><br />
Directivity pattern measured from 0-90deg, 10deg
increments:<br />
<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEh6rmQ4G1scGEqrloki9cmgXV-_ZX5Xn3nES62U3N2BUXNjutD0rZzEScgWueWVS6rDGAf2AkJF6LJpvHg0kepCAVyP6eZ5Z4Scib3dZL3yc55NTH_LopDdbRwtArBCojzOPcotBGiDLxg/s1600/Econowave+%252B+DE250+normalised.png" style="clear: left; float: left; margin-bottom: 1em; margin-right: 1em;"><img alt="" border="0" id="BLOGGER_PHOTO_ID_5582993311931007346" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEh6rmQ4G1scGEqrloki9cmgXV-_ZX5Xn3nES62U3N2BUXNjutD0rZzEScgWueWVS6rDGAf2AkJF6LJpvHg0kepCAVyP6eZ5Z4Scib3dZL3yc55NTH_LopDdbRwtArBCojzOPcotBGiDLxg/s200/Econowave+%252B+DE250+normalised.png" style="float: left; height: 105px; margin: 0pt 10px 10px 0pt; width: 200px;" /></a><br />
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEi-uvsSg_PCSRhGelljibUd6gZz9_AsKJp2EVGkTPtJt2wGjPXtD2B6xhvSaZsOV2abwpXrSsGDIsbHhF-0HudTqZklAN96sLtWE_3uE1X5lzK5OWZrtkM8Gaf0I1mqb_1WNvk-JrYzYVY/s1600/celestion.png" imageanchor="1" style="clear: left; float: left; margin-bottom: 1em; margin-right: 1em;"><br /></a>
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<ul>
<li><a href="http://i.imgur.com/2enp3.png">XO</a>: <span style="font-size: small;"><span style="color: red;">1250hz, LR2</span></span></li>
<li><a href="http://i.imgur.com/zm8rI.png">EQ1</a>: Waveguide loading
notch1<span style="color: red; font-size: small;"><br />PEAK 3981hz / -4.1db / 1.2Q</span> <br /> <a href="http://i.imgur.com/3jnei.png">Raw and eq notch 1 (measured 1m)</a></li>
<li> <a href="http://i.imgur.com/004iv.png">EQ2</a>: Waveguide loading
notch2<span style="color: red; font-size: small;"><br />
PEAK 1269hz / -3db / 1.5Q</span> <br /><a href="http://i.imgur.com/hwUrF.png">Fully eq'd Tweeter (measured 1m)</a></li>
<li>Passive L-PAD<br />Follow the passive <span style="color: red;">-11db LPAD</span> configuration as CD1 above.</li>
<li>Attenuation, Phase, and Delay<span class="st"><br /><a href="http://i.imgur.com/cWPSQ.png">With W1</a>: Attenuation <span style="color: red;">-5db</span>, Polarity <span style="font-size: small;"><span style="color: red;">INVERT</span></span>, Delay:<span style="color: red; font-size: x-small;"> <span style="font-size: small;">0ms</span></span></span> (<a href="http://i.imgur.com/YQNUm.png">measured 1m</a>)<br /> </li>
</ul>
<span style="color: #cc0000;">CD3 (Celestion CDX1-1745) </span></div>
<div style="text-align: left;">
<span style="color: black;">Compression driver: <a href="http://www.blogger.com/goog_484095655">Celestion </a></span><a href="http://www.parts-express.com/pe/showdetl.cfm?Partnumber=294-2124">CDX1-1745</a><span style="color: black;"> (<a href="http://i.imgur.com/dOva9.jpg">photo</a>) + PE Adapter</span></div>
<div style="text-align: left;">
Waveguide: As per CD1 and CD2 (Pyle)<span style="color: black;"> </span></div>
<div style="text-align: left;">
<span style="color: black;">I configured and listened briefly this compression driver at recent GTG and was pleasantly surprised as how similiar the frequency characteristic and sonics is <a href="http://i.imgur.com/0t0UQ.jpg">compared to B&C DE250</a>.</span></div>
<div style="text-align: left;">
<span style="color: black;">A longer-term experience and listening may be needed to confirm, but there were<a href="http://www.stereo.net.au/forums/showthread.php/42176-Waveguide-GTG-IV"> three of us</a> who felt the same during that brief setup. We even set it up playing both drivers together left and right.</span><br />
<span style="color: black;">(update: this has been <a href="http://www.thomann.de/gb/celestion_cdx1_1745_8_ohm.htm">confirmed by another guy</a> that CDX1-1745 is a poor man's DE250!)</span><br />
<span style="color: black;"><br /></span></div>
<div style="text-align: left;">
<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEi-uvsSg_PCSRhGelljibUd6gZz9_AsKJp2EVGkTPtJt2wGjPXtD2B6xhvSaZsOV2abwpXrSsGDIsbHhF-0HudTqZklAN96sLtWE_3uE1X5lzK5OWZrtkM8Gaf0I1mqb_1WNvk-JrYzYVY/s1600/celestion.png" imageanchor="1" style="clear: left; float: left; margin-bottom: 1em; margin-right: 1em;"><img border="0" height="149" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEi-uvsSg_PCSRhGelljibUd6gZz9_AsKJp2EVGkTPtJt2wGjPXtD2B6xhvSaZsOV2abwpXrSsGDIsbHhF-0HudTqZklAN96sLtWE_3uE1X5lzK5OWZrtkM8Gaf0I1mqb_1WNvk-JrYzYVY/s200/celestion.png" width="200" /></a><span style="color: black;"> </span></div>
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<br />
<span style="color: black;"><br /><br /><br /><br /><br /><br /><br />Please follow the exact configuration of CD2 (DE250) for this compression driver.</span></div>
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<span style="color: #ff6600; font-size: 130%; font-weight: bold;">Optional variations</span></div>
<div style="text-align: left;">
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<b>35hz Linkwitz Transform</b><br />
If the woofers (W1) are equalised to 35hz, Q=0.5 (instead of 20hz above), then further +5db can be obtained and that raises the loudspeaker's sensitivity to ~97dB. This also relieves the strain of the woofers when playing loud. In order to have this:<br />
<br />
<ul>
<li>W1 EQ2 biquad needs to be <a href="http://i.imgur.com/aMLHg.png">changed</a> to 35hz, Critically damped Q=0.5</li>
<li>W1 EQ3 Baffle Step SHP needs to be changed to <a href="http://i.imgur.com/TzQuK.png">Shelving Lowpass</a></li>
<li>W1 EQ4 biquad of -1db is <a href="http://i.imgur.com/4pdy1.png">added</a>.</li>
</ul>
<br />
<b>Crossover</b><br />
Second-order Linkwitz-Riley crossover topology (LR2) was chosen for group delay, however you might want to play the loudspeakers at very high SPL continously. In this case a 4th order crossover providing 24db/oct slopes may be a better approach. This can be done by selecting Woofer and Tweeter crossover to <a href="http://i.imgur.com/IxhpW.png">LR 24db/oct</a> and changing the <a href="http://i.imgur.com/ofEQg.png">Tweeter's Polarity to non-inverting</a>.<br />
<br />
<b>Using Subwoofer</b></div>
<div style="text-align: left;">
Subwoofers can greatly relieve the stress to the pro-drivers which has highish Fs. I would recommend at least a pair to minimise excitation of room modes. The optimum scenario is to cross with LR2 slope (Q=0.5) and this can easily be done by modifying EQ2 (LT) biquad values. For example, if you would like to cross with the Subs at 80hz the biquad values for the LT <a href="http://i.imgur.com/WJKa0.png">would be like this</a>.<br />
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<b>"Geddes" Foam Plug</b></div>
<div style="text-align: left;">
Earl Geddess popularised and patented the 30ppi foam plug approach on his GedLee line speakers. Many users reported improvements in the sound quality. I also <a href="http://i.imgur.com/29BZf.jpg">tried it</a> and <a href="http://www.diyaudio.com/forums/multi-way/103872-geddes-waveguides-529.html">posted</a> my experience which was different. The foam will <a href="http://i.imgur.com/A1cE3.png">attenuate </a>the high frequency. So you need to increase the tweeter level by 2dB. </div>
<div style="text-align: left;">
In Australia you can buy them from <a href="http://www.flexfoam.com.au/">FlexFoam</a>. Ask for "30ppi Mericell foam". They are also referred to as filter or reticulated foam.</div>
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<b>Loudspeaker Toe-In</b></div>
There is a view that these speakers are best listened at extreme toed-in angle, as much as 45degrees. It does seem to provide uniform coverage across listeners but with soundstage depth compromise. I find about 5-10deg off the normal triangle is satisfying.<br />
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<div>
<span style="font-size: 130%; font-weight: bold;"><span style="color: #ff6600;">Room response analysis</span></span><br />
<br />
Elias Perkonen kindly performed <a href="http://www.diyaudio.com/forums/multi-way/164029-wtf-wavelet-transform-audio-measurements-what-how.html">wavelet analysis</a> of the in-room response of these speakers.<br />
<br />
Native frequency response, left and right:<br />
<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjzpj2yPKO8Hqg84pKyZ2vhzvKizokKU50Yj3pcRJT-YEEQ4wLH8-w9XE_Ju1Z6DfoMrzjuGfNE_YXx6WyAQIIho54j1LLFMDLhJJdXXC2R4kBga47K5Bl9febgTQ-rjDzRexTNXZbbaDg/s1600/gainphile_cd_room_norm_left.PNG"><img alt="" border="0" id="BLOGGER_PHOTO_ID_5577570842712589394" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjzpj2yPKO8Hqg84pKyZ2vhzvKizokKU50Yj3pcRJT-YEEQ4wLH8-w9XE_Ju1Z6DfoMrzjuGfNE_YXx6WyAQIIho54j1LLFMDLhJJdXXC2R4kBga47K5Bl9febgTQ-rjDzRexTNXZbbaDg/s200/gainphile_cd_room_norm_left.PNG" style="cursor: pointer; float: left; height: 120px; margin: 0pt 10px 10px 0pt; width: 200px;" /></a><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEg6nzeaZZ8mvMikOwxLOIqOHjfElLfcWFOmr-Hzq6rPkhydrvYvQd2K0OBoTHpzssUKI71Cn8fcVEoT9L1NAEbX73OSHLA_hhX2j-UjRaTsgnZTmsJYhpwJOEsERCqQAp2M-kzQhSHuYsc/s1600/gainphile_cd_room_norm_right.PNG"><img alt="" border="0" id="BLOGGER_PHOTO_ID_5577570846787085378" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEg6nzeaZZ8mvMikOwxLOIqOHjfElLfcWFOmr-Hzq6rPkhydrvYvQd2K0OBoTHpzssUKI71Cn8fcVEoT9L1NAEbX73OSHLA_hhX2j-UjRaTsgnZTmsJYhpwJOEsERCqQAp2M-kzQhSHuYsc/s200/gainphile_cd_room_norm_right.PNG" style="cursor: pointer; float: left; height: 120px; margin: 0pt 10px 10px 0pt; width: 200px;" /></a><br />
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Longer time windows, 150ms and 300ms:<br />
<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhXZjMUnr6PNtPncoaZboziKBIN0-dANbf8rM6LX3FePDMT7tW359MPALm73w_ABPvwNJ4n9J70HwS9oWbGdZQB4tWSjXqaMbdICMG24UrEPdN17HkzXoXJjnKMt7-TQi1GeOO22MRWaXk/s1600/gainphile_cd_room_norm_right_150ms_20dB.PNG"><img alt="" border="0" id="BLOGGER_PHOTO_ID_5577570851323377730" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhXZjMUnr6PNtPncoaZboziKBIN0-dANbf8rM6LX3FePDMT7tW359MPALm73w_ABPvwNJ4n9J70HwS9oWbGdZQB4tWSjXqaMbdICMG24UrEPdN17HkzXoXJjnKMt7-TQi1GeOO22MRWaXk/s200/gainphile_cd_room_norm_right_150ms_20dB.PNG" style="cursor: pointer; float: left; height: 120px; margin: 0pt 10px 10px 0pt; width: 200px;" /></a><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEghH6DY1UaD8QqOad78a5d_FGHoDJCdQ4JDPalmYHXU4GUPPTTDL5nSTSaGFQgdncgw43ZpfAOXRqU2P3bVsk9k1y4rQerkze5xP8IC9467ndI-pehytuD8yvL06FGEwmK4ozDlajGgN9U/s1600/gainphile_cd_room_norm_right_300ms.PNG"><img alt="" border="0" id="BLOGGER_PHOTO_ID_5577570855837105234" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEghH6DY1UaD8QqOad78a5d_FGHoDJCdQ4JDPalmYHXU4GUPPTTDL5nSTSaGFQgdncgw43ZpfAOXRqU2P3bVsk9k1y4rQerkze5xP8IC9467ndI-pehytuD8yvL06FGEwmK4ozDlajGgN9U/s200/gainphile_cd_room_norm_right_300ms.PNG" style="cursor: pointer; float: left; height: 126px; margin: 0pt 10px 10px 0pt; width: 200px;" /></a><br />
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<span style="font-weight: bold;">Update 11/2/2011</span><br />
Zilch (Evan) who is the champion of this design passed away. He will be sorely missed.<br />
<a href="http://audiokarma.org/forums/showthread.php?t=350053">http://audiokarma.org/forums/showthread.php?t=350053</a><br />
<a href="http://www.youtube.com/watch?v=WvNH23XfeVI">http://www.youtube.com/watch?v=WvNH23XfeVI</a><br />
<br />
<b>Update 3/2/12</b><br />
Production version of original S15 documented and posted.<br />
<br />
<b>Update 4/2/12 </b><br />
B&C DE250 variant posted<br />
Celestion CDX1-1745 variant posted<br />
<br />
<b>Update 14/9/12</b><br />
Added information on stuffing<br />
<br />
<b>Update 16/9/15</b><br />
Check out these youtube videos :)<br />
<a href="https://www.youtube.com/watch?v=SwSK8dmeqgU">https://www.youtube.com/watch?v=SwSK8dmeqgU</a><br />
<a href="https://www.youtube.com/watch?v=dvTsjRXJgZQ">https://www.youtube.com/watch?v=dvTsjRXJgZQ</a><br />
<br />
<b>Update 19/6/16</b><br />
Biquad values will be different for newer 96khz boards such as 4x10HD or 2x4HD. Use these two biquads instead. The first biquad is to shape the original response to 35hz with Q=0.7, and the second one is 35hz Q=0.7. Together they produce acoustic shape of 35hz LR4 highpass.<br />
<br />
Try to remove the baffle step compensation first. I did not need it in my room.<br />
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<div class="separator" style="clear: both; text-align: center;">
<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiddszJHgSNSwl0HhSIA1kW9XibyOi2o4ogLnZaHkdXiUQab0k7MV2M53ucNKdl2hTsvx4kEBA_6y9EYTiTLe_Pn5zAuTeO0hQHC43LeZ8AaC2DBggFcb7SeCiAxZrNBNMsffYPdPMsoD0/s1600/S15+LR4.png" imageanchor="1" style="clear: left; float: left; margin-bottom: 1em; margin-right: 1em;"><img border="0" height="101" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiddszJHgSNSwl0HhSIA1kW9XibyOi2o4ogLnZaHkdXiUQab0k7MV2M53ucNKdl2hTsvx4kEBA_6y9EYTiTLe_Pn5zAuTeO0hQHC43LeZ8AaC2DBggFcb7SeCiAxZrNBNMsffYPdPMsoD0/s200/S15+LR4.png" width="200" /></a></div>
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<br />
<br />
<br />
<br />
<span style="font-size: x-small;">biquad1,</span><br />
<span style="font-size: x-small;">b0=1.00156217438683,</span><br />
<span style="font-size: x-small;">b1=-1.99720737914148,</span><br />
<span style="font-size: x-small;">b2=0.995679854523304,</span><br />
<span style="font-size: x-small;">a1=1.99722277903866,</span><br />
<span style="font-size: x-small;">a2=-0.997226629012953</span><br />
<span style="font-size: x-small;"><br /></span>
<span style="font-size: x-small;">biquad1,</span><br />
<span style="font-size: x-small;">b0=0.998612353349429,</span><br />
<span style="font-size: x-small;">b1=-1.99722470669886,</span><br />
<span style="font-size: x-small;">b2=0.998612353349429,</span><br />
<span style="font-size: x-small;">a1=1.99722278171542,</span><br />
<span style="font-size: x-small;">a2=-0.997226631682297</span><br />
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<br />
<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhleMPbCtuTpH51EMsQlnENTatiQ7rHT3rAxgpUdf4AqnLRakVV9TsG_Coov5UnpqzgW_nWpZeq8WoT1Z-3oY4bGiyKwTWjK2nJ7Bf5FGA-jUJYl09R5WGZvN25GWWQC0pokz9wA98d7zM/s1600/s15r.png" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><br /></a> </div>
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Unknownnoreply@blogger.com32tag:blogger.com,1999:blog-6998112391780171236.post-71715771049429678362010-09-29T02:22:00.000-07:002011-07-29T00:24:46.995-07:00S14 DSP - 4 Way Open Baffle with DSP XO<a onblur="try {parent.deselectBloggerImageGracefully();} catch(e) {}" href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiy9x-jbOx4L4ra214G7Ss7eSsKXyBz8J-2WtoFlZmrbW3B2FH3H0zcMhOI-YrsN4RFYNPEKZkN3nw-1Awr7BVCopieUm-WZErHy_pvFfxWyRhAhXSmEER6bd9CQ4PxQWLch3b9GQLBXKQ/s1600/s14b.png"><img style="display: block; margin: 0px auto 10px; text-align: center; cursor: pointer; width: 331px; height: 400px;" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiy9x-jbOx4L4ra214G7Ss7eSsKXyBz8J-2WtoFlZmrbW3B2FH3H0zcMhOI-YrsN4RFYNPEKZkN3nw-1Awr7BVCopieUm-WZErHy_pvFfxWyRhAhXSmEER6bd9CQ4PxQWLch3b9GQLBXKQ/s400/s14b.png" alt="" id="BLOGGER_PHOTO_ID_5631943941831799394" border="0" /></a><br /><a onblur="try {parent.deselectBloggerImageGracefully();} catch(e) {}" href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjfR90h5qgvY3qv-k_OtEoYbJemEkF3j_rC55qG1sO5yjSQLfYz3z-Ct7GqC0XiWPTuQPrOOaoSLYabp5MEWxAEpazsmET2UatlOJykQtnd2h-uD7lEbQBSvVTMEhhQBPHdTFNQVU-iRgs/s1600/s14bdesign.jpg"><br /></a>A work in progres ...<br /><br />These are 4-way Open Baffle loudspeaker design with 3-way main panel and inverted W-Frame subwoofers.<br /><br /><span style="font-style: italic; font-weight: bold;">Objectives:</span><br />- Low midrange distortions, by assigning separate drivers for low-mid and high-mid duties<br />- Low vibrations due to W-Frame subwoofer's opposing forces<br />- Small footprint and height<br /><br /><span style="font-style: italic; font-weight: bold;">Challenges</span><br />- The 5" high-mid drivers may proven to be too small for the baffle width<br />- Designing 4-way crossover will be more complex due to <a href="http://linkwitzlab.com/frontiers_5.htm#V">phase </a><a href="http://linkwitzlab.com/frontiers_5.htm#V">interference</a><span style="font-style: italic;"><span style="font-style: italic;"><span style="font-style: italic;"><span style="font-style: italic;"><br /></span></span></span></span><span><span><span><span>- Back to back dome tweeters' known limitation. "dipolar" response, instead of dipole</span></span></span></span><span style="font-style: italic;"><span style="font-style: italic;"><span style="font-style: italic;"><span style="font-style: italic;"><br /><br /><span style="font-style: italic;"><span style="font-weight: bold;">Drivers</span><br />Tweeters: Vifa DQ25 with phase shield removed. Back to back.<br />Mid-high: Fountek FW146 5" aluminium woofer<br />Mid-Low: Seas L21RNXP, 8" aluminium woofer<br />Subs: 4x Jaycar 10" Paper cone<br /><br /><span style="font-weight: bold;">Crossovers:</span><br /></span></span></span></span></span>Two 2x4 MiniDSP Kit<br />Advanced 4-way crossover plugin<span style="font-style: italic;"><span style="font-style: italic;"><span style="font-style: italic;"><span style="font-style: italic;"><span style="font-style: italic;"><br /><br /><span style="font-weight: bold;">Amplifiers:</span><br /></span></span></span></span></span>Sure Electronics ClassD 4*100 watt <span style="font-style: italic;"><span style="font-style: italic;"><span style="font-style: italic;"><span style="font-style: italic;"><span style="font-style: italic;"><br /></span></span></span></span><br /></span>Follow the design and testing process at <a href="http://www.htguide.com/forum/showthread.php4?t=36626">HTGuide Forum</a>.<br /><br /><div style="text-align: center;"><a onblur="try {parent.deselectBloggerImageGracefully();} catch(e) {}" href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEift3DTkabtOUyDfvcJAnT2Y8XSRRA8iay9wBytDg_q9PuMUBsZeaLhDu7VFLxuaGlfA6D6mHvcJ1eyF8TpVVUdU68I3P4Vx18W0hO4EnEF5U1iX6DD6VWByXNc6cmXBl3ZXHOWXPMm1fw/s1600/S14.png"><img style="display: block; margin: 0px auto 10px; text-align: center; cursor: pointer; width: 320px; height: 216px;" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEift3DTkabtOUyDfvcJAnT2Y8XSRRA8iay9wBytDg_q9PuMUBsZeaLhDu7VFLxuaGlfA6D6mHvcJ1eyF8TpVVUdU68I3P4Vx18W0hO4EnEF5U1iX6DD6VWByXNc6cmXBl3ZXHOWXPMm1fw/s320/S14.png" alt="" id="BLOGGER_PHOTO_ID_5634671700864021586" border="0" /></a><span style="font-style: italic;font-size:85%;" >Target frequency response of S14</span><br /></div>Unknownnoreply@blogger.com0tag:blogger.com,1999:blog-6998112391780171236.post-47645724267741284752010-02-20T00:40:00.000-08:002010-03-05T01:16:37.880-08:00S13 OB - Fullrange dipole tweeters<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjwxNG5Dmb2eD-yaad4FLnlCxz35qrFlYBH3DAYBgAetSv5JIq1l9fNb8YquJFmKf5V4KMzv5no0Bu5LpXaNh91DtRvuQtqBoalBY8xPX-0DY988350sbSqwmt8G-OgefcfLxikklvzFrg/s1600-h/dsc_1255.jpg"><img id="BLOGGER_PHOTO_ID_5445067594181363714" style="DISPLAY: block; MARGIN: 0px auto 10px; WIDTH: 400px; CURSOR: hand; HEIGHT: 266px; TEXT-ALIGN: center" alt="" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjwxNG5Dmb2eD-yaad4FLnlCxz35qrFlYBH3DAYBgAetSv5JIq1l9fNb8YquJFmKf5V4KMzv5no0Bu5LpXaNh91DtRvuQtqBoalBY8xPX-0DY988350sbSqwmt8G-OgefcfLxikklvzFrg/s400/dsc_1255.jpg" border="0" /></a><br /><br />The back-to-back dome tweeter used in typical dipole setup is the achiless heel of the system. The on and off-axis frequency response is <a href="http://www.diyaudio.com/forums/multi-way/155632-s12-ob-returning-true-ob-4.html#post2002442">not smooth</a>.<br /><br />Many diy-ers investigated <a href="http://www.diyaudio.com/forums/multi-way/161681-my-s13-ob-uniform-polar-response-tweeters-last.html#post2091908">alternative approaches</a> for the problem. Basically to keep uniform dipole radiation to very high frequencies, the baffle needs to be either very small or naked drivers are used. Having a pair of Tangband fullrange speakers I experimented with them.<br /><br />The resulting result is smooth polar response up to 10khz.<br /><br /><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgMa3Nia9F0GXv_-003DSlQYjtpNqbmATWvzWMVn9eM0AqqbipTod-KfY5IGIX0N9gZqQ8nJNwndIjFNHU33goPRLqJuuu-buIpXTdHn_hVOaJNIj7wGDatd2i9fmnPSwSVs2XNyqoooMc/s1600-h/03newbaffle0-75degcompiled.png"><img id="BLOGGER_PHOTO_ID_5445069158021739266" style="FLOAT: left; MARGIN: 0px 10px 10px 0px; WIDTH: 200px; CURSOR: hand; HEIGHT: 135px" alt="" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgMa3Nia9F0GXv_-003DSlQYjtpNqbmATWvzWMVn9eM0AqqbipTod-KfY5IGIX0N9gZqQ8nJNwndIjFNHU33goPRLqJuuu-buIpXTdHn_hVOaJNIj7wGDatd2i9fmnPSwSVs2XNyqoooMc/s200/03newbaffle0-75degcompiled.png" border="0" /></a><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br />While it looked promising, after a while I felt the whole system did not sound coherent. I have not understood the reasons behind it but it is perhaps due to:<br /><br />- The transition of baffle size<br />- The fullrange driver unable to deliver the resolution required for high frequencies<br /><br />I have sinced moved back from this design. The full investigation can be <a href="http://www.diyaudio.com/forums/multi-way/161681-my-s13-ob-uniform-polar-response-tweeters-last.html">read here</a>.Unknownnoreply@blogger.com0tag:blogger.com,1999:blog-6998112391780171236.post-88219362315947061182009-11-25T18:19:00.001-08:002010-11-04T17:57:44.328-07:00S12 OB - Open baffle simplicity<div><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEh3_CAWpp65Fwi4qlFnUKSCtnf8SBAgOXj9zEHGLmAZMo6FNpOeuTH8BWB21DA2-HQJ2vFDHI4CJrH_2Gf909emv5JDcUchvZzwwIiqglpgZV-L4sVI2DGpvJEsBEWHMWUgDPtrOF8gNKw/s1600/dsc_0987.jpg"><img id="BLOGGER_PHOTO_ID_5408231455259550434" style="margin: 0px auto 10px; display: block; width: 400px; height: 266px; text-align: center;" alt="" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEh3_CAWpp65Fwi4qlFnUKSCtnf8SBAgOXj9zEHGLmAZMo6FNpOeuTH8BWB21DA2-HQJ2vFDHI4CJrH_2Gf909emv5JDcUchvZzwwIiqglpgZV-L4sVI2DGpvJEsBEWHMWUgDPtrOF8gNKw/s400/dsc_0987.jpg" border="0" /></a>A true open baffle with its simplicity (no H/W/U -frame etc.) I have observed that there is something about them which other variations simply couldn't match due to very uniform polar response.<br /><br />The tradeoff is absolute maximum bass output. A <a href="http://gainphile.blogspot.com/2009/11/dipole-bass-array.html">dipole bass array</a> utilising a total of 8x 10" woofers could be added to overcome this limitation. Then the system effectively become a 4-way as well as requiring more space.<br /><br />Follow the discussion at diyAudio forum <a href="http://www.diyaudio.com/forums/multi-way/155632-s12-ob-returning-true-ob.html">here</a>.<br /><br />Also similar discussion at Stereo.Net Australia <a href="http://www.stereo.net.au/forums/showthread.php/19709-Look-ma-no-box-%21%21">here</a>.<br /><br />Basic measurement data is available <a href="http://www.diyaudio.com/forums/multi-way/155632-s12-ob-returning-true-ob-4.html">here</a>.<br /><br />System: Active, 3-way with response shaping and time alignment.<br />Tweeters: 4x Hivi K1<br />Midrange: 2x Seas L21 RNXP<br />Woofers: 4x Jaycar CW2119<br /><br /><span style="font-size:85%;"><span style="font-style: italic;"><removed></removed></span></span><span style="font-style: italic;">System's strengths</span>: Coherency, transparency, very spacious and natural-sounding.<br /><br /><span style="font-style: italic;">System's weaknesses</span>: Colorations due to L21's metal resonance harmonics are audible on certain material, outright bass output. Back-to-back dome tweeters are never ideal dipole radiators.<br /><br /><br /><span style="font-weight: bold;">S12 Dipole Crossover</span><br /><br /><a onblur="try {parent.deselectBloggerImageGracefully();} catch(e) {}" href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhm0cX2clGyO_6eWKFPwP6O6RS2_nOO8sgAmkB_XlfHCGwPHm638w-04JDZ4o9QX6VQO8BOgMoroS-9NomxPLkH_5V0KJEhfuk4_VVoSY-MFHBJV03Hsqa6p2z_W3DkQEP_AqyxB-TKQCo/s1600/S12+Dipole+XO.gif"><img style="margin: 0pt 10px 10px 0pt; float: left; cursor: pointer; width: 200px; height: 44px;" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhm0cX2clGyO_6eWKFPwP6O6RS2_nOO8sgAmkB_XlfHCGwPHm638w-04JDZ4o9QX6VQO8BOgMoroS-9NomxPLkH_5V0KJEhfuk4_VVoSY-MFHBJV03Hsqa6p2z_W3DkQEP_AqyxB-TKQCo/s200/S12+Dipole+XO.gif" alt="" id="BLOGGER_PHOTO_ID_5461031514753572162" border="0" /></a><a onblur="try {parent.deselectBloggerImageGracefully();} catch(e) {}" href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEghB7_Z7ZBCIeS5uLjfJKE1SrKbngtbRw6rEGC6OaCl61_CR2fidoZnQ2byhXXV3MaAPruPbmg-je0mS9HKZbwXCNAe1fOHpaT1apNJAwVGNxRogIqUXD_JVvMAs089IX0RzUamJ67r1Rs/s1600/xfer+v30.gif"><img style="margin: 0pt 10px 10px 0pt; float: left; cursor: pointer; width: 200px; height: 135px;" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEghB7_Z7ZBCIeS5uLjfJKE1SrKbngtbRw6rEGC6OaCl61_CR2fidoZnQ2byhXXV3MaAPruPbmg-je0mS9HKZbwXCNAe1fOHpaT1apNJAwVGNxRogIqUXD_JVvMAs089IX0RzUamJ67r1Rs/s200/xfer+v30.gif" alt="" id="BLOGGER_PHOTO_ID_5461048932886999858" border="0" /></a>Click on the image on the left to see the functional diagram of the active crossover. The crossover can be quickly implemented if you have the budget to procure digital XO such as DCX2496. I use analog op-amps and <a href="http://i188.photobucket.com/albums/z72/widhibrata/audio/dsc_0405.jpg">prototyping board</a>.<br /><br />Much of the functions are clearly explained at Linkwitzlab website. What is unique is the need to compensate early rolloff of the Seas L21RNXP. The midrange exhibit some coloration due metal cone breakup harmonics and this would be the same even if you use the more expensive W22EX. It is not always audible and only appears in certain recording material.<br /><br />Seas L21RNXP is an excellent unit aside from the normal metal resonance, however they have been discontinued. Seas L22RNXP is the drop-in replacement. Forget exotic drivers such as the W22, you may as well build the Orion. Why use metal cones then? Well the audible transparency of those drivers is unmatched. They are pistonic until that breakup arrives.<br /><br />Hivi K1 tweeters exhibited very low distortion and excellent dispersion when crossed at 2.2khz or above with LR4. The tweeters can easily be substituted with something else, as long as the units have excellent distortion and dispersion. With those criteria it's hard to beat the cost of K1 ($12). Dispersion is very important, for example the popular Vifa XT25 would not sound as accurate due to poor dispersion. The venerable Seas 27TBFCG would be a good candidate and the cost is still somewhat reasonable. Better tweeters may allow you to cross lower and help reduce midrange breakup coloration, but not much. Ideally 8" metal cones like L21/22 or W22 should only be used below 800hz.<br /><br /><br /><span style="font-weight: bold;">Construction</span><br /><br /><a onblur="try {parent.deselectBloggerImageGracefully();} catch(e) {}" href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiMXCirmBhizu64Pv25_iY1GedmtJOLB9MZXclpISJh1bhxEAmLr6PfVaDqB7uHqhKRJGu2bP8gTD2rZSmQA4m_ETbb7KN6KO0pHYw2F5Q-lFKh_TSHT831bUVhVJHwe4yB3l3jOpQMvNM/s1600/s2+construction.gif"><img style="margin: 0pt 10px 10px 0pt; float: left; cursor: pointer; width: 200px; height: 148px;" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiMXCirmBhizu64Pv25_iY1GedmtJOLB9MZXclpISJh1bhxEAmLr6PfVaDqB7uHqhKRJGu2bP8gTD2rZSmQA4m_ETbb7KN6KO0pHYw2F5Q-lFKh_TSHT831bUVhVJHwe4yB3l3jOpQMvNM/s200/s2+construction.gif" alt="" id="BLOGGER_PHOTO_ID_5461040435093350322" border="0" /></a><br /><br /><br /><br /><br /><br /><br /><br /><br />Building the S12 is straight-forward, however there are some important considerations.<br /><br /><a onblur="try {parent.deselectBloggerImageGracefully();} catch(e) {}" href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhglHyLZtl7ZL7HLw2abVxVdUmwlppxVgI5FlyB80U-0S-PvvLB7jQ4BYdUwCP8Wl0ScKXUpQGCCLk43UhxosDH6l7WjFeN1HPim2qmj6P5Q_rPlqFVhB0HTed7864K4Pvp9-KKRdkxsrI/s1600/S12+Side2.jpg"><img style="margin: 0pt 10px 10px 0pt; float: left; cursor: pointer; width: 73px; height: 200px;" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhglHyLZtl7ZL7HLw2abVxVdUmwlppxVgI5FlyB80U-0S-PvvLB7jQ4BYdUwCP8Wl0ScKXUpQGCCLk43UhxosDH6l7WjFeN1HPim2qmj6P5Q_rPlqFVhB0HTed7864K4Pvp9-KKRdkxsrI/s200/S12+Side2.jpg" alt="" id="BLOGGER_PHOTO_ID_5461042970719936562" border="0" /></a>The side panels are not to increase acoustic path length as normally done by dipoles with "wings". They are for structural reasons, and generally the narrower the better. Although they are very narrow indeed (4.2cm) the midrange section should not be obstructed. I have observed audible midrange coloration if the side panels are simply extended through the midrange height, although I do not see it in the measurement. This could be a very high Q resonance which are hidden by diffraction effects in measurements.<br /><br />The cavity for rear tweeter must be blocked, otherwise it forms a resonator. Stuffing the cavity using polyfill only helped marginally. It has to be angled to minimise diffraction issue with the midrange.<br /><br /><br /><div style="text-align: center;"><a href="http://gainphile.blogspot.com/">Link to other designs</a><br /><br /><div style="text-align: left;"><span style="font-weight: bold;">Updates:</span><br /><span style="font-weight: bold;">16/4/2010</span><br /><br />Removed comments and pictures about sealed bass, DX25<br />Added observation notes on strengths and weaknesses<br /><br /><span style="font-weight: bold;">Updates<br />:</span><span style="font-weight: bold;">17/4/2010</span><br /><br />Added Dipole XO diagram and Construction<br /><br /><span style="font-weight: bold;">Updates:<br /></span><span style="font-weight: bold;">3/11/2010</span><br /><ul><li>Implemented DSP XO (MiniDSP.com)<br /><br />2x MiniDSP kit<br />1x 4-Way Advanced Crossover<br /><br />For a total of $210 this is a truly great value for money. Refer to <a href="http://www.diyaudio.com/forums/minidsp/174145-minidsp-linkwitz-orion-asp.html">my investigation</a> which led me to this path. The quality is outstanding and they are sonically transparent. Be wary in using digital attenuation for driver level matching. I use trimpots instead.<br /><br />XO points (acoustics):<br />W-M: 200hz, 2nd order<br />M-T: 2khz. 4th order<br /><br /></li><li>Built an <a href="http://www.stereo.net.au/forums/showthread.php/29544-Class-D-8-channel-amplifier-build">8-Channel Class D Amplifier</a> to drive the loudspeakers.<br />Another value for money. Total build cost for this 8-channel amplifier is $160 (!). Even cheaper than chip based amplifiers and there is no soldering involved.<br /></li></ul></div></div><br /></div>Unknownnoreply@blogger.com3tag:blogger.com,1999:blog-6998112391780171236.post-81578332040289534992009-11-16T21:14:00.000-08:002009-11-19T21:19:03.406-08:00Dipole Bass Array<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjzfLZPGQcY_L6xfDu3SfVfCWe5HZZKbOZaBHhifAx6VFT97momswo9UDqvJ8waEvCdxISC3PSeMLHo9vT7aijJhCED3fIj4NSfdIVt0j_QD0X1Y6psHuL5u8l9cIrYOZvsnXBtl2K7rs4/s1600/Dipole+Bass+Array.jpg"><img id="BLOGGER_PHOTO_ID_5406050680006518546" style="DISPLAY: block; MARGIN: 0px auto 10px; WIDTH: 185px; CURSOR: hand; HEIGHT: 400px; TEXT-ALIGN: center" alt="" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjzfLZPGQcY_L6xfDu3SfVfCWe5HZZKbOZaBHhifAx6VFT97momswo9UDqvJ8waEvCdxISC3PSeMLHo9vT7aijJhCED3fIj4NSfdIVt0j_QD0X1Y6psHuL5u8l9cIrYOZvsnXBtl2K7rs4/s400/Dipole+Bass+Array.jpg" border="0" /></a><br /><div>Doubling the number of woofers provide further +6db of maximum output. Basically they are vertically-stacked W-Frame open baffle speakers. The arrangements allows the front baffles to be kept narrow.</div><div></div><br /><div>Follow the discussion at LinkwitzLab forum <a href="http://orion.quicksytes.com/viewtopic.php?t=1409">here</a>. There are some cosiderations that needs to be investigated carefully, for example the effect of gravity to cone acceleration.</div>Unknownnoreply@blogger.com2