These prototypes are further continuation of Stealth 2. Where is #3 you may ask? Well it was a prototype failure and skipped.
Eminence Alpha15A crossed 24db at 1kHz. Good tonality was achieved but both drivers especially the vurnerable TC20 are strained.
What I gained from these prototypes are 1) Excellent bass using the Eminence with correct shelving lowpass filters, 2) Eminence peaks and their appropriate notches, 3) The Alphas have surprisingly good upper frequency extension.
This measurement was taken from listening position, in-room. Ignore the SPL numbers as I did not calibrate them.