All my life I've been able to hear a high frequency hum coming from TV sets. It was the way I could always tell whether my father had the TV on in the bedroom and I could hear it all the way on the other side of the house. Now I've been noticing that I can hear it coming from my grandpa's TV - downstairs, across the hall, and with the door closed. I hear it even when I can't hear the program he's watching. I always thought everyone could hear this sound, but I recently mentioned it to my mom and she said she can't hear it, and my grandpa can't hear it either (they both have good hearing). Am I the only one? Try putting on your TV set and muting the sound - you may hear a very high frequency hum coming from the TV. It's not loud and it's rarely annoying - it's just present and persistent. I've always been sensitive to high frequencies - when someone sets a digital timer and it starts beeping, I have to hold my ears until it stops, even if it's not that loud or that high. I've naturally chosen the musical instruments that play chords and/or basslines - high violin or flute parts bother me. And in my Electronic Music class last semester, we heard some things where I had to wear earplugs but the high frequencies didn't bother anyone else. So back to my original question, am I the only one who can hear that sound coming from the TV?