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Are we missing the interesting point about this post?

We seem to be off discussing grounding strategies, but we're missing something interesting. This is (IMO) the most intriguing point in John's post:

I drew one of the PC wires with a loop, to clearly show how the current that the amp draws can generate a voltage in that green loop. By modifying the coupling here, either by PC geometry changes, or even the inclusion of a ferrite assembly sliding over the PC, you can either lower or raise the coupling

I don't know about the MAGNITUDE of the effect, nor its impact, but this statement suggests a mechanism by which changing power cords could have a definite audible impact on system performance (in a very system-dependent way).

I don't recall seeing this particular connection established before.

In other words, it's not about the impact of the PC on the incoming 110v AC or the noise level coming in through the IEC connector. It's about the impact of the PC on the overall system noise, driven by the PS current into the device.

Note also that this model implies that the impact of a given PC will depend on the power supply topology inside the equipment. For example, cap-input power supplies exhibit high peak charging currents (compared to choke-input), so there would be large spikes induced in the ground.

Interesting....

Peter

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