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I remember when I could hear the 15,750 Hz from TVs, some were worse than others, and I could hear "ultrasonic" alarm systems up around 22kHz. when I would go in to certain retail stores, back when I was a teenager and early 20s. Just need exposure to loud music and high frequency test tones for a few years to drop that hearing range down to 10-12 kHz and no problem!
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