I used some test tones today to test my hearing, and that left me wondering what others actually mean when they say they can “hear” sounds up to certain frequencies. I had done such tests before, which left me a little worried, as it seemed I could only hear up to sth between 14 and 15 kHz, i.e. I could still hear the 14 kHz sound, but not the 15 kHz. But it had never occurred to me to crank up the volume, and the sound files I used (from Qobuz, actually) were all at a level of -10 dB. Also, my usual listening volume is quite low, some 60-65 dB according to smartphone measurements. Now I read that the level required to hear anything at all goes up steeply with higher frequencies. So when I listened louder, I could hear higher frequencies, and at a position of the volume knob that yields 80-85 dB with music, I could even hear something with the 18 kHz tone. “Something”. The 14 kHz tone was the last one I could actually attribute a pitch to, maybe the 15 kHz one, too, but that’s already a stretch. The higher tones are only a rather faint noise to me. At 18 kHz, barely anything at all was audible, but there definitely was “something”. Is that the same for you at frequencies you say you can “hear”? Am I actually hearing the tone at all, as I can’t attribute a pitch to it? Or more something like undertones?