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Currid
@dbr
Every setup is different, but I had hum with my powered sub 2.1 MiniDSP system. Solved it by grounding the sub end of the phono signal lead. Mains plug with a single wire going from earth pin to the phono cable shield. Seems sketchy, but I can't see how it would actually be dangerous.
Once I got a hypex amp with balanced inputs the hum disappeared anyway. I'll sell you a magik snakeoil coated plug with bit of bell wire sticking out for only $789.00 (m8s r8s)