I'd second the PS Audio device. But for a high current amp, they can get quite pricy. I've got a Sim Audio W-5 powered by the 600 watt version of the PS Power Plant. The sound is better, and I can actually play it louder with the PP than straight from the wall -- Not that I really need to! With Paradigm Studio 100's (90dB sensitivity), the PP starts complaining (as well as my ears and the amp and the speakers) when I hit 105 dB (about 110-115 peak) at the listening position. At the same time, the PP is also driving my transport and preamp/dac, for a total of about 650 watts output (continuous) from the device. Even so, you might need the bigger PP 1200 (1200 watts), or even PP2000, for a heaftier amp with less efficient speakers.
