Ritz: hopefully your trip was productive!

What I am trying to understand is what is causing the difference (from an electronic standpoint) between these two amps?

If you look at the specs, they are very similar. The only "major" difference that I can think of is, at high power, the monoblock switches to class G (or something like that) whereas the other does not.

Alright sportsfans, is this enough to hear a difference?