I did one of those hearing test things, where only people under 25 are suppose to hear it. Well my teenage son's computer is right next to me like 5 feet and I turned it on and I could barely hear it. But he grabbed his ears and started yelling 'turn that off it's so annoying.' I turned it off, but then a few minutes later I turned it back on until he was screaming. I did it again a few minutes later and a few more times through out the night. He's 17, thinks he knows it all, so he deserved it. I have the link saved for another day