I am not an electrician and dont know very much but you might try a mains smoother - it cleans pu the cycle in the AC.
I might say I have a studio a long way from the house and its wired by an electrician competently, but I get a hum on my speakers - it was suggested that I tried this - I did but it did not work for me. I think that my equipment is running on low powere due to the length of the cable to the studio - 40 metres.


Win 11 64, Asus Rog Strix z390 mobo, 64 gig RAM, 8700k