Currently using the Yamaha A-S1200. Mixed bag here. I got it because it was designed like my old amp...dual Mosfet. However after hook up. it made my 42 year old HPM 100's sound like MUD!!
Terrible, horrible, no good, very bad DAY! Tone control was no rescue.
I hooked my Monitor Audio Silver 8's to the Yamaha A-S1200, They were already good speakers, but man these things were hummimg through this machine. I also hooked up a pair of Energy C3 speakers with just as much pleasure.
Because I simply refuse to give up my HPM's that I enjoy everyday...the Yamaha is now up for SALE! Too refined for my old babies!