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drdna wrote:

Exactly. Thus, it suggests a ground loop internal to the PP2000, doesn't it?

In my view it is highly unlikely as a definition of loop itself implies two contacts to ground and PP2000 has only one.  I do not think that you will go anywhere with accusing the PP2000 in humming. If the PP2000 has zero point zero Ohm from input to out grounds, the 500 mV between the neutral and ground and output no DC then I think it is absolutely out of blame. Might be I am wrong but only by the fact that you have the hum it is self-evident to me that you have ANOTHER, additional to the PP2000, path to ground from your system. It has nothing to do with your need of house rewiring and it has nothing to do with quality of wires – it is just a second path that you need to found. You are multi-amping with the refrigerator subs runs own SS amps. If your refrigerator amps and your horn amps referenced to deterrent power grounds then here is a perfect loop for you as they are most likely have single-connectors and this signal grounds are connected via RCA jacks. It is very difficult to trace the ground look without being there but I do feel that it is your loop. If your PP2000 is completely broken then where do you see in it a SECOND path to ANOTHER ground? So, I think that it is externals problem.

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