Parasound had success with their "Z" Amp. Tiny chassis (about 1.5" tall at the most and approx. 8" across). 45 very sweet watts per channel, but the chassis does get warm. And I agree with Ritz re. heat management with more power. My Carver M4.0t, with 375 watts per channel (plenty of power for just about any home situation), always manages to blow me away while it's barely breaking a sweat. I love listening to the Telarc 1812 cannon shots with that amp. It's the only one I've heard that can actually deliver and that's why I have kept it all these years while other amps have come and gone in my system.