My rig uses short paths throughout run from pole to meter base/through dual dedicated to units(less 40')second breaker after a/c,yet I heard torriodial humming late evening when the noise floor drops.
Tracked it down by throwing breakers off line one by one. Narrowed down the offending circuits,outdoor lighting transformer,toothbrush charger,cheap radio,refrig. So now I just throw those breakers off,when turning on the audio breakers.Ahhh ,the details emerge from a black hole now!
Tracked it down by throwing breakers off line one by one. Narrowed down the offending circuits,outdoor lighting transformer,toothbrush charger,cheap radio,refrig. So now I just throw those breakers off,when turning on the audio breakers.Ahhh ,the details emerge from a black hole now!