Hum issue - driving me more crazy

Unplug any cables (RCA, F connector, etc.) from your Cable TV/Sat/Antenna and see if the humm disapears.

Rwwear - hum started at time of new XOVER. BUT this was also same time that I "buried" the IC's under the floor and got new IC's. Thus multiple simultaneous changes. IC's above floor are great.

Ozzy - No TV or SAT in system - LP, DAC and CD player are only sources

BALANCED cables has fixed all issues even allowing me to use the dimmers in the room without a peep. Even slight hum in Vinyl subsystem (2 chassis phono preamp) is gone.

I don't know enough electronics to understand what "I fixed" (or more likely unbroke) but the end results are outstanding for about $120.00 worth of cable and connectors. All I can say is in my application/room/system -> Balanced IC's are great.

Thanks to all. Have a memorable Memorial weekend

Yeah, if going balanced fixes it, go for it. It could take a long time to figure out what is happening. Enjoying music is much more fun. ;-)

Always use balanced mode when possible. More equipment should be balanced.

PS Audio has something called a Humbuster (now version 3).
Never tried it.