If possible try it over your high end hifi/phones, and toggle on/off the generator, with your eyes closed. I tried with my AKG phones direct in a 3.5mm output on a Lenovo laptop. (I’ll try again on my hifi, when I get settled in in our new house)
I concider myself having above average hearing. I’ve produced, mixed and mastered a dozen or so albums, and have quite a solid experiences with hifi/audio in general. No matter how good I think my hearing is, I can’t hear anything above 14Khz
Highres audio is an illusion in my world usage.
Be honest and post your result
I’m “only” 43 by the way