I'd like to compare the switching amps to Class A FET, which is the opposite end of the spectrum, I guess.Did you ever get a chance to really listen to the Selectronic ProFet amp? I think it's a great sounding amp. Class A FET. Controlled bass, Smoooooth midrange. Beats the hell out of every SET amp I've ever heard in the bass. Seems to me that this amp would be the cream of the crop as a bass amp in a bi-amped SET/FET setup.