Investigations

Application of DSS filter for single-tweeter Dipoles
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 ?

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(14/6/12)

Class D for Tweeters?

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?

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 here, or follow my discussions in SNA here and here. (7/4/2012)

Compression Driver showdown: B&C DE250 vs. Selenium D220Ti

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? 
Read .pdf here and summary/discussions here. (26/5/2011)


Effects of Crossover Points on Loudspeaker Directivity

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 here.



Constant-directivity vs. Dipole Loudspeakers
Which is the better transducer ?
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(21/4/2011)