I'm a 60 year old bass player (played in loud rock bands when I was younger) . I can just barely hear 16khz. 15khz with no problem. All things considered, I'm not doing too bad 🙂
I had to turn up the Brilliance on my tweeters all the way, but the best I could do is 10kHz. I 'think' I could hear 12kHz, but that was probably wishful. 😉
The first time I tried this test last year I used the Tape Input on my amp, and I figured it was clipping the sound off. I forgot all about the Brilliance, which was right down.
I guess I was wrong, as it is now on CD Input, Brilliance cranked. 🙁
I'm 20, and I could hear 17 kHz with mid-volume and 18 kHz with the volume completely up (on my MBP speakers). Using my desktop speakers at a high volume I think I can hear 19 kHz but it is very faint.
I know this is a super late follow-up, but it looks like the site mentioned here is out of date. I found an alternative that’s safer, more user-friendly, and reliable https://recordbuilds.com/high-frequency-hearing-test/. Looks like it logs the data, so you can see how your results compare with others.