Class d has a switching power supply so it is able to produce more power and still stay cool. Class A is the cleanest of the amps but runs very hot and waste alot of amps to make a few watts of power they are only like 40% efficent. class ab is a lil better and is what most amps are. Class D is considered a sub amp only because while it is extremely efficent at close to 90% but it dose slightly distort the high end signals.
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