You seem to have had power weirdness for ages.. Sounds like it's time for your own audiophile power pole!
Yeah, joking aside, probably worth seeing if you have more than one spur available. Sucks that the Mac is that noisy, though.
I usually file all power stuff under audiophoolery and walk away. But... Although I don't really use laptops for anything (wife has one) I have heard, from hard-core rationalists, that laptop power-supply noise is a thing
and, isn't a possibility that noise is being fed back into the mains? Just mentioning it in passing. This stuff is way out of my depth.
I made a "power strip of doom" with two Macbook power supplies, two phone chargers and a dodgy SMPS I got from China. By moving it around the house I now know which outlets are on the same circuit as my speakers...
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