In my experience, dedicated lines, (use ceramic fuses by the way, all else sounds markedly worse), and good power cords does the trick, and no conditioner I have tried has done anything than make the sound worse in that context. Also, in that context replacing any single cord with a stock cord is a big step backwards. However this is in a 230V 50Hz quarter acre block suburban neighbourhood. Fiddling with a few ideas on earths made no meaningful difference for me either. I have heard power conditioners improve things at a mate's appartment.
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