One way to tell would be to turn off the main speakers and only run the center and listen. If no sound then hook up the center to one of the main wires and listen again with the mains on, if the speaker now works it's the receiver.

Axiom has a 5 year warranty against defects.


Jason
M80 v2
VP160 v3
QS8 v2
PB13 Ultra
Denon 3808
Samsung 85" Q70