I've use Macintosh(ss&tube), B&K(ss), Futterman(tube), Carver(SS) and Accuphase(ss) amps to drive KLH Model-Nines, no problem. I have used the same assorted equipment to drive M-L CLSIIz, no problem. I could drive SoundLabs A-3 with all but the tube amps. It seems you have to see what works best.