Amp repair

It makes no sense,

the speakers would simply be out of phase, less bass most noticable, but connecting speaker wires reversed, at the amp or at the speakers should not damage the amp.

I think the OP touched the wires together, that’s the way I read it. That would indeed short out an amp...I speak from experience. As long as I was in the high-end business, it’s bound to happen...a few times :-)

I found a couple of pics of the inside of this amp.  Man, this thing is stuffed!  I don't see any fuses, (they should have popped first...if used and installed?).  Maybe they use relays or something else?

If the OP can’t find someone local, I always recommend Stephen Sank at Talking Dog in Arizona. He IMHO, is one of the best techs in the country.

Posts are close together on the amp, and I had it in bridged mode and the cable end touched the pos and neg posts at the same time. Shorting it out. DA move.