Bench test like Ron said. If you did what I suggested, it's a signal to amp problem. The amp played with an outside source. Take things apart and hook it to a battery for power, use a cd b or phone and try that. Hook speakers directly to the Hu itself, then try Hu to amp. Your going to have to go and test one thing at a time to find the thing that I'd not working. Test the rca too... so strange..
YzGyz
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