Kingman,
I have not ab tested these amps, but I have tore up quite a few speakers (especially tweeters) with the DRS. IIRC, the old Phases are more tube like in sound, while the DRS sounds like well executed ss circuits. The design is what thay call class H today (I think), with 2 voltage rails. It operates on the lower voltage unless demands require more power. Unusual in this design is that if the peak is only required on a positive or negative peak, it only switches on that peak, according to the manual. When tested by Julian Hirsch he found that it would sustain the higher wattage for much longer than the time just required for a normal transient. I know that I can run mine with meters right at 150 and do not hear any noticable distortion during peaks, even when the clipping indicators blink. I have beat up a bunch of Maggies (4 ohm) running it so that the I see momentary clipping and God only knows how much power they were getting! Most of my other speakers I have been unable to to turn the DRS loose on, due to limited power handling or it is just to loud.
That said, nether the DRS or the 700 will drive the 9 kappas! I would not drive the DRS into less than 4 ohms, and the 700 specifically warns against this in its manual.
Also, I went down and snapped a few pics of some of my stuff, which I will try to post.
Bill, it is never too late to start! I haven't bought it all yet, LOL.