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RE: Other points

"But what if the changes in voltages are fluctuating fairly rapidly due to dynamic music played at a moderate to loud level. What does that do to the power supply of the amp and the power supplies of other equipment that is fed off the same circuit?"

A well designed power supply should effectively isolate the downstream circuits it powers from rapid line voltage fluctuations AND it should also largely isolate the line from rapid fluctuations in downstream energy draw. This is part of the benefit of a large power supply energy storage capability in the form of "charged" power supply capacitors and/or inductors when there is no active power supply regulation employed. If long term and slow fluctuations are important, active regulation should be employed.

And then there's the variability in voltage supplied to your main panel that's caused by random load switching by your neighbors who happen to be on the same distribution transformer as you. No dedicated circuit will reduce or correct this condition.

Overall, I believe it's very easy to lapse into marginally effective AC power overkill once basic safety and convenience issues are addressed.

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