It’s very hard to describe, but I think/feel the difference is kinda like this:-
a valve amp is still “active” even no nothing is actually playing through it. It’s charged, all ready moving, just waiting for a signal to work upon, and when a signal is passed through it works upon it in a positive/negative wave, replicating the motion of the strings etc.
class d feels like it only reacts to the positive “push” of the strings, making it feel like half the dynamics and depth feel missing somehow.
it measures perceptibly as just as loud, but kind feels half there..
what do u guys think?