Summary: I'm surprised at all the 5 star reviews, maybe I got a lemon. Some people talk about "at it's lowest speed". My PC doesn't have speed control, so that's no help. It's supposed to run at 17db, which is pretty quiet. I definitely don't hear it when music is playing, but I can hear it now across the room. I even moved the PC down off of a shelf behind a wooden barrier. All 17 db (at least) are a hum that's about A below middle C.