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My guess is the transformers on the output are buzzing with audio peaks, seen this before.

Sounds like audio coming out of the amp.

Me, I don't like 1×4 amps, too much current draw too much heat for the result when a stout dual final radio will wring the same amount of real power out of 4 2879's

And if you damage them, plan on replacing them all with HG, unless you have a stash of real Toshiba's.

I agree with the recommended 100 watt dead key.

73

Jeff