Quote:
One part of the loop is the shield in the RCAs
Common misconception. I should probably make this clearer in my "explanation of a ground loop"...
If the problem were only on the RCA shields you wouldn't hear it. It's also on the center pins as well.
Okay, technically, the problem isn't "on" those RCA cables at all, it's because of whatever electrical path provides a better ground path than the ground wire itself, which may or may not be any given connection, regardless of whether that connection is a positive or negative wire.
My point is that the noise is audible because the electrons from the power supply are flowing through the audio circuitry via the RCA center pins.
The only reason grounding the RCA shields sometimes fixes it is because it changes the ground path and makes the electrons stop flowing through the RCA center pins. Not because the problem was in the shields.
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