Jeff I had the same thing happen to me with my main M80s and even though the binding posts were tight somehow they weren’t properly making contact. If you are using regular speaker wire pull it out and reconnect it. I’m not sure what it was but maybe for me the plastic washer got in the way. You may have the same problem.

Pulling the drivers out isn’t hard and I would try that next to see if there are any wires loose internally.

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