Bingo! All electronic equipment even if not in use hurts the sound. Musical instruments, too. CDs stored in the room, too. And I say that with some risk to myself from cargo cultists.
Covering a TV behind your speakers?
I just read on another site a guy asking what difference it would make covering his TV while playing music. His picture shows a decent system but it must be in the basement. It can't be more than 12' wide. No sound treatments to be seen. I'm going through a divorce and will have to move to a much smaller one person house. I've been lucky for 30 years having my expossed basement listening room, 20' x 24', naturally almost perfect as far as sound goes. I have been reading here and other sites trying to learn about treatments. Never heard the TV thing before. A few people responded to the guy's post that they hang drapes over the TV. I would think since current TV screens are not glass but whatever they are made of now they wouldn't cause a problem. Looking forward hearing from the experts here.