I know of none, other than the infamous "90% @ a one Ohm load equales 1000 watts continous". That means they are extremely stable and well contolled amps. I have the first pair ever made, and they flat smoked my old Mono SE's right out of the box. They don't run hot under heavy loads, and seem to continously evolve for about the first four hundred to five hundred hours. I have never seriously been able to begin to tax the power output in them, and I honestly have to rate them a level above the Candella preamp. In otherwords they deserve a better preamp.
gary
