What 50wpc or higher amps have a totally different sound from Pass Labs, in a good way?

@erik_squires .
I concur. 
In fact, I'd love to compare Pass to Ayre, one day.
Bob

In a good way? Well, that is up to the listener. But if one likes Pass with a particular speaker, it would be difficult to go the opposite way and call it "in a good way" I suspect.

But opposite of Pass? (which I consider just on the warm side of neutral in general). I don’t consider it syrup either though. I consider Moon (more recent stuff) to be just to the brighter side of Neutral but certainly not crazy bright.

Bryston comes to mind, anthem does also, Krell, though they seem to be trying to get away from that.

Agree with erik_squires. I’ve owned both Ayre and Luxman products. Neutral, uncolored, clear, natural sounding. It’s a matter of taste and matching to your other equipment, speakers and room. 

There are a lot of them in this thread:

My Long List of Amplifiers and My Personal Review of Each! | Audiogon Discussion Forum

but it will take you a while to read it.