i've found that LED lights can cause interference. I had a lot of interference coming in on FM, which I solved initially by keeping the LED lights off which isn't always a convenient solution, and then by using a ferrite ring on the FM antenna lead, which has worked perfectly. And as already noted, dimmers cause noise.
Short of running new, dedicated 15 or 20 amp lines for audio, what can I do here?
My system is plugged into outlets that share lines with lights in the room. When I turn the lights on or off via their switches, which are dimmable, I hear noise through my speakers, and especially through my sub-woofer. Any correction other than dedicated lines for the audio?