Mosquito flying in a quiet room, ten feet away from your ears 20 dB A recording studio or a very quiet executive office 35 dB A typical quiet office with the door closed and computers off 50 dB Typical conversation in a room 75 dB Typical, comfortable music listening level in headphones 100–105 dB Classical music or opera concert during loud passages; some portable music players go to 105 dB 110 dB A jackhammer three feet away 120 dB A jet engine heard on the runway from three hundred feet away; a typical rock concert
