In the never-ending debate raging in the audiophile community about sound quality and what humans can or cannot hear, it is very very very very incredibly often cited that the upper-limit of the audible range of human hearing is 20 kHz, give or take. Some indicate that this is a conservative estimate, and that the actual upper-limit is actually lower than that (~18 kHz). While others suggest that sounds could be heard or otherwise perceived up to about 25 kHz-30 kHz:
Sampling rates higher than about 50 kHz to 60 kHz cannot supply more usable information for human listeners.
And some others suggest that there is substantial variation between individuals around the upper limit:
The human range is commonly given as 20 to 20,000 Hz, though there is considerable variation between individuals, especially at high frequencies
So is there any biological evidence whatsoever that young, healthy humans can hear or otherwise perceive (or sense) sound waves above 20 kHz? And what would be a conservative estimate of the absolute upper limit of the audible spectrum for humans (i.e. usable sound information for human ears and senses)?
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