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Also remember this is a bridge amplifier, so theoretically the power number quadruples because the amplifier can push the 12V in one direction, then the other. In the real world, however, it's closer to double the power of a single amplifier. It's the equivalent of a single 24V supply in this case. So, ideally, the amplifier can deliver about 50W into a 2 ohm load. 12^2/2 = 72W. That's the peak to peak power rating. Normally you'd have to divide that number by 2 then multiply by .707 to get RMS, but since this is a bridge amplifier you'd simply multiply the 72W number by .707 which gives 50.9W. Of course there are losses in the MOSFETS and the filter circuits, so the power will be less than the calculated value.
This is a rather early example of a class-D amplifier so the sound quality difference doesn't surprise me.
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Erich Loepke
Last edited by trinescope; 04-20-2011 at 11:58 AM.
Reason: corrected typo; 74W should have been 72W
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