Class A/B vs Class H | AVS Forum
WEBAug 12, 2016 · Class A can use two "sets" of devices in pushpull (for the positive and negative halves of the signal) and that is the way most audio amplifiers are designed. That gets the theoretical efficiency up from ~26% to 50% or so for an ideal output stage. Class H uses a variable supply rail as BassThatHz stated so it tracks the input signal. That ...