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I've read that the design of component earthing varies a lot between manufacturers, clearly the sub needs a ground which it should be getting from the RCA, the fact that grounding the rca stops the hum suggests to me that the hum is on the ground of the component or the cable is broken, have you tested the cables have ground continuity.
I'm waffling because I don't have a clue what might be causing it! :)
Airhead
Turned for the max: no. It’s only really noticeable when nothing is playing, all volume controls at “normal”.