I have my La Scalas with a sub in an 18' x 25' x 10' room and have driven them with several amps including SET's. My Cary 300B signature monoblocks with 8 watt/ch are classic SET Class A amps. Also I use Sonic Frontiers push/pull 55 watt/ch Power 1 with KT88 tubes. I had a First Watt solid state SET from Pass for a while just for the fun of it but moved that. Of course, I have also used some solid state class A-B designed amps. Actually they all sounded good to my ears although a little different. The SF sounds more like an extremely quiet SS amp than tube while the Cary 300B's are mid range sweet, very nice. I didn't think the First Watt was worth the price although it sounded good. I have never felt I lacked power even though I sometimes listen fairly loudly.