Youtube compresses audio above 17kHz so it shouldn't be audible at all past that. Note: It's at some random value that isn't exactly 17kHz, I think it's 17.6kH

Youtube compresses audio above 17kHz so it shouldn't be audible at all past that. Note: It's at some random value that isn't exactly 17kHz, I think it's 17.6kHz? So it no longer making sound for you at 17.5kHz could be because of that, not because of your hearing.