I could hear all three with my computer's sound set as low as possible, although I found the 16 and 17KHz were slightly louder than the 15KHz. I'm usually aggravated by these sorts of noises, and am also aggravated by squeaking cars, which sounds similar.
However, I just turned 20, so this is perhaps not very informative :P.
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Date: 2006-06-20 09:12 pm (UTC)However, I just turned 20, so this is perhaps not very informative :P.