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RE: Actually

Think about the return current for the noise energy and the audio system. Unless this noise harvester is using some path to a charge sink not in common with the electrical grid which wouldn't meet NEC requirements or the noise current shares the return path with the audio system current. Since they sell the thing in the USA clearly the second option is what was chosen by the manufacturer. Since we know gound wires are never perfectly impedance free and current through an impedance will result in a voltage, any shared current on a conductor will result in greater modulation of the ground voltage at a level proportional to the size of the noise current and ground path impedance. This effect, commonly known as ground bounce, will be lessened in audible impact by having this noise current profile rectified to DC before passing it through the return path as this will at least move its energy out of the audible band. Of course in this items description the noise current is actually a switched DC rather than true DC so there is a tradeoff that the switching noise may become apparent as a side effect.

I think the idea has technical merit but in my opinion is a bandaid not a solution.

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