@kota1 , you answered your own question. They only use AB on the low power HF amplifier. With a DEQX I can use class A amps at all three levels. And there is another problem, 3 way. I vastly prefer one way plus a subwoofer.
@sokogear , I do not think your analogy works. You can not define "winning" for sonic quality. The target is purely subjective. Athletes do not have to be perfect, they just have to beat everyone else.
I know exactly which recordings can fool people. I have a grand piano in my media room and my daughter plays violin. I can fool anyone into thinking someone is playing the piano, same with the violin if my daughter is home. I have done it to my wife.
What this thread does is convince me that the majority of us have never heard a system that approaches the Absolute Sound. As sokogear suggests it is a confluence of the equipment used but most importantly it is about the speakers and the room. The rest is just icing on the cake.