I admit it, most of my favorite amplifiers produce enough heat to warm up a room and consume a lot of AC power. "Green," they are not. Class D amplifier designs (the "D" does not stand for digital) are vastly more efficient, and run cool to the touch.
For example, my Bel Canto REF500S power amp ($2,495) puts out 250 watts per channel, and it's a bona fide audiophile quality design. Bel Canto doesn't specifically refer to the REF500S as a Class D amp, but its low-heat, ultraefficient, heavily regulated switch-mode power supply … Read more