I can hear tv's when they are on too. I thought I was crazy but maybe I just have good hearing.

Me too. I hear monitors all over the office but since I think this is a bit weird I don't tell anyone, I just turn them off. :)

@ trodas As said, I can hear it to the very end thanks god! :) I'm 21 btw

The downside is I can only hear up to 18kHz. The upside is I did a test similar to this about 10 years ago (I'm 23 now), and my max was also 18kHz back then. So at least my hearing hasn't degraded :). Ps. I can hear whether TV's are on perfectly, but I've never heard a monitor before. What do they sound like?

The noise that a tv makes when it's on is exactly 15625 Hz, so even old geezers (30+ like me) can hear it... I can also hear a monitor easily and a very similar noise from my pc:s power supply. But I stll think you can't get anything over 20KHz out from "normal" stereo system so testing your hearing at home is not very scientific.