I don't think it's the wall outlet. Popping at the speakers and a smoking amp... that is most likely an open safety capacitor that's in parallel with the filtering cap causing a line-voltage arc over.
But judging by the way you asked your question about receptacles and circuit breakers, I would strongly suggest an electrician check out what you did.
But judging by the way you asked your question about receptacles and circuit breakers, I would strongly suggest an electrician check out what you did.