I was watching to a bunch of Steve Albini playing with tapes and he has a “test” to see how far you can listen to:
Long story short: switch between a sine and a square waveform to see if you’re able to listen to any difference.
A pure sinewave would only reproduces its frequency while the square adds the same freq 3 times higher (and some others).
So if you’d like to check to 17 kHz, choose 5.67 kHz for your tone generator and switch back and forth between the two waveshapes.
If you don’t listen to any difference…
For the sake of the testing, I could distinguish 15k but not above…
So what about you??