<https://audiophilestyle.com/forums/topic/4735-lengthy-primer-on-ac-with-some-thoughts-on-reducing-the-computer39s-impact-on-yours/#comment-56349>
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"What to do... some advice (in order of effectiveness): \n  \n1.  Run a dedicated circuit, in the US this should be 20 amp.  You are better off running your entire system from one circuit if you can (this avoids ground loop issues), but if your system might peak out above 15 amps, run two identical circuits. \n2.  Use AC conditioning gear.  This needs to be selected carefully for your system, as different systems (and AC supply) will respond differently.  My favorite solution is to use high quality regeneration (stay away from switching regenerators) for source components, and high quality passive filters for amplification.  I avoid transformer isolation as these can raise the impedance of the AC line, and add distortion to the line. \n3.  Use power cables that are well sheilded, to avoid noise pickup and broadcast through the cables. \n4.  Eliminate noise causing components in the home: light dimmers are one of the worst culprits unless they are switched off.  Cordless phones, computers/TVs (plug these into powerful series filters, like those from PS Audio, Panamax, and Monster).  If you can, try and keep high current draw appliances on the opposite phase of your AC supply (fridge, dishwasher, washer/dryer). \n5.  To lower the overall noise floor of the home experiment with things like PS Audio Noise Harvesters, and Alan Maher products. (these can distributed around the home at noisy parts of your AC wiring, note that the led on the Noise Harvester gives feedback as to where they may be most affective). \n6.  Choose components that try and address AC noise problems internally.  Many designs may have EI or R-core style transformers, these are better at rejecting incoming noise than toroids.  Many designs also include some kind of AC filtering circuit internally. \n  \n  \n"
<https://audiophilestyle.com/forums/topic/4735-lengthy-primer-on-ac-with-some-thoughts-on-reducing-the-computer39s-impact-on-yours/>