Guessing they are unshielded so you could run a ground wire from the plugs on the signal end to a grounding block or to a grounded receptacle to the screw that holds the cover plate on if that makes sense. Maybe a simpler test is lightly twist the two R/L cables together to see if this cancels the noise and make sure you are clear of any power cords. If you are near other cables try not to run parallel with them. Twenty some years ago I recall VDH cables were known for picking up RF/EMI, so not sure about newer models or what you have. Try twisting them to see if that works and cable grooming as this might help or take care of it.
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