I ran into this website (
http://www.ochenk.com/entry.php?id=63) which has sound files of white noise played at different frequencies to test the range of your hearing. I found that (via headphones) I can clearly hear up to 18,000 Hz, and I can just barely hear 19,000 Hz. It drops out all together at 20,000 Hz, but it still gives me that
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