Only 4 homes on our transformer (we were in the last 60 of 70,000 to be repaired after this winter’s ice storms?) but I think the noise must come from much further afield too. Ours is the only one of the four to have air conditioning. All these things factor in I’m discovering with now having much more sensitive and revealing speakers. Isolation made an obvious improvement. Shunyata Research Hydra yielded an additional increment (more consistency). I’m still on the fence about the 20 amp dedicated line, it sounds the same as the regular plug circuit. Someday I may try reworking the ground on the dedicated line to see if that does anything.
