Headphones

I thought the same. I used to always crank the volume up, especially when I was in the gym or car. Recently I went to the doc to get my hearing checked, because I couldn't understand what my girlfriend was saying sometimes.

Turns out it's normal I can't hear her when she is talking to me in the kitchen while she's sitting in the living room.

My hearing is all fine and dandy. I'm keeping the volume on a safe level now, nonetheless.