25k Hz is ridiculously high and most frequency generators wont generate that, 25 Hz sounds really cool though

20 herz would be a good name for a band

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thanksgiving is the joke. Makes it look like americans were good to the natives

Human hearing picks up freqs from 20Hz to 20kHz, but if it's real quiet you can go a lil lower/higher.

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And I'm almost impossibly pretentious, so that's saying something.

i can hear only up to 12k

rip ears

I can't hear 20k, I can hear up to 17k, but not as much as younger people, seeing as they scream in pain from it.
(Sine wave)

20k is barely noticeable, probably due to shitty headphones