I second the McIntosh vote. I drive Shahinian Diapasons with a MC402, and although the Diapasons are no easy load, the Mac drives them with ease. Even at listening at hairsplitting volumes to Mahler or AC/DC, the amp hardly gets warm. I was looking for a bass-strong, musica l amp, and have found it. A friend of mine runs his Diapasons with a Plinius SA-102, and is equally happy. Two fine amps which are easy to find used, too.