I realized that lots of teens around my area use a ring tome with a 21khz tone. They do so because most of their teachers cannot hear the ringing of their cell phone.
Originally Posted by Anathallo
Using the only cans I have on me - HD598s, so they're wide open (computer fan and office-mates are audible), I could hear up to 19khz - had to turn up the volume a bit past a comfortable level, though, past 18khz. Beyond that, I didn't want to turn up the volume much more to see if I could hear the tones in the 20s.
Interesting test, though!
Here's the question - why does it matter? Is there an (actual, not electronic) instrument that can produce those tones?
EDIT: Forgot the poll - Male, 26. Also not going to vote until I listen in a quieter space.