[ ... stuff ...]
I'd also mention that these days I do most of my computing on a system with a 12VDC power input, and for the last 3 months, that system was powered from a solar-charged 12VDC power system. There is no "ground" in this system, and no noise - the power supply is as clean as you can get, audiophile class in fact :)
And yet ... my "cheap" 12VDC amplifier which is also a USB DAC, suffers from the pin<=>chassis wiring problem. Just touching the USB connector to the chassis of the computer generates noise. It doesn't have to be anything to do with AC power supplies ...
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