What sort of environment are you operating your rig in?
Because I've got single coil pickups on my guitar that pickup EMI like crazy (like nearly anything in the room) - and they get amplified so I hear them through my amp when I'm not playing. I've found that some halogen fixtures and fluorescent ones have awful EMI nearby. I'm guessing it's because they've got big "ballast" transformers for the fixtures (inside the walls) that have big coils and lots of energy being exchanged.
Do you have either of said fixtures where you're listening?
If so, I'd recommend incandescent or LED lighting - it seems much less noisy for me, anyways.
Good luck
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