Excluding equipment, room acoustics, cables and shelving, I would say running dedicated 20 amp circuits with a dedicated isolated ground, independent of the house ground!! then clean cable dressing, then getting cables off of the ground.
Sit in your usual listening position. Interlock your fingers and put them behind your head at ear level, so you're sitting there like some big shot executive. Elbows should be pointed at the outside edge of your speakers.
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