Well I owned them in the 70s bought them used 901s Series 2 for $350 and when properly set up they were excellent. I hear fatiguing No,I listened to Rock,Jazz and Classical. They always sounded Great...even with DISCO,lol.I had a Sony Str 7065 which put out 70 watts and it was plenty of power to drive them...There are still people here who are POWER crazy... I now use a Caryin 50th tubes 20 wpc.and drive Polk lsim707 and every body saids you need over 350 wpc to drive them.....Smoke another joint or relax on the Zantac. I have all kinds of SS power Amps...my all different manufacturers..and I don't know but the tubes amps are killer.im 70 and been buying audio equipment since the late 60s.