I am currently driving my GM's with an Accuphase P-3000, which is 75 wpc into 8 ohms and doubles that output into 4 ohms. The results are excellent. Others have stated on this and other forums that the GM's will sound better with higher powered amps. I cannot confirm or refute that, but in my experience and in my listening room, which is 13' x 19' with an 8' ceiling, the 75 wpc from my P-3000 is everything I need.
