Can you clarify the conditions in which the amp is shutting down.

I am under the impression that you turn up the dial to a certain point and the amp shuts down. In which case like what a few people experience in the past sounds like exposed wire being damaged by an animal, vacuum (cleaning lady) etc or something going on like a whisker at the connection point. Since you are using banana plugs, check the banana plugs on the onkyo and at the speaker terminals that they are not touching either. This can cause the amp to shut down. The Polk terminals might have a bit more space for the plugs than the Axioms.

If there is a short inside the speaker itself then the amp would react the same way.






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