Why can i hear a television when it's on, even when there is nothing coming out of the speakers?
Well, Anonymous, I hate to be the one to break this to you but the electromagnetic waves from your television set are apparently interacting with the government-implanted chip in your brain. The only way to prevent them from reading your thoughts at all times it to cover all of your windows with aluminum foil & make yourself a helmet out of it as well.
Seriously, though, your television is a mechanical device. There are moving parts working inside of it. Even though they are very quiet, there are things running in there & they make a noise. I'm no mechanical engineer so I can't be more specific but that is the reason that you can hear you're TV even when the sound of the programming is muted.