There is a buzz 60Hz buzz in my audio system, which usually gets louder in the nights. Suspecting it to be ground loop hum, got a couple of Balanced Isolation Transformers. There is an improvement in audio, better but 80% of the hum is still present. So got a cheap cable tracer from Amazon. Best $13 I ever spent.
This tracer is picking up hum from the middle of the room, about 8 feet from the nearest wall. As I walk closer to the switches, hum got louder. Turning off the two dimmer switches reduced the hum by about 70%.
Came across this video on YouTube on how the dimmer switches work. Dimmer switches are not stepping down the voltage but are chopping the sinewave.
Holy Crap - How is that even legal?
https://youtu.be/5-wPkFv6eJE?si=wJoTNXoR-mRaKl3tI have 8 dimmer switches in my home. Going to replace all with regular non-dimming switches before considering a dedicated circuit for the audio room.