Try earthing the shield of the phono lead at the sub end. Bit of wire to a bright copper radiator pipe should work if you don't want to do the plug thing. I'm interested to see if my solution works for you too...
@dbr started
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Try earthing the shield of the phono lead at the sub end. Bit of wire to a bright copper radiator pipe should work if you don't want to do the plug thing. I'm interested to see if my solution works for you too...