I finally got my HK 630 going yesterday and likewise was finally able to listen to the M60s I exchanged for the M22s and my new Adcom 5503. It's unbelievable how the Adcom has tamed these speakers. I've got all of the detail the M60s are good for, and yet my "S"s don't hiss like they did with the 3 reciever amps I tried with them. But the what I can now hear with the speakers has got to be their best quality. Obviously I can on about this, but I know many happy owners have already posted such comments. Just wanted to add my 2 cents, especially the match with the Adcom.