Nothing will ever come close to a Pass Labs amplifier, especially if it is of class A design, if you can live with the heat that it generates.
They are very good, but they were even better to me back when he used complimentary bi-polars instead of mosfets. They had far more current ability, (and no mosfet mist) and the reason I think Dan D'Agostino stayed with them.
None of Pass Labs (mosfets) can "out current" Krells or D'Agostino (bi-polars) into low impedances, like into Wilson Alexia's 0.9ohm bass
Cheers George
