They are wonderful amps. I use them presently with a Audio Research LS15 and Proac Speakers. They take a long time to break in and are sensitive to both cables and cords. I I switched to good MIT wires and got a good holistic sound with a good field and detail. I also use a psaudio power supply for the front end and plan to for the amp when I'm ready to purchase one. The improvement in the front was enough that my wife who notices little difference to comment.
