[Ajoha]

Sorry, humans cannot hear up to 23kHz. Our hearing ends at 20kHz. Point. After a decade on earth your loss is already at 18kHz or less. (Loss means not: you hear nothing but you do not hear as good as when you where born).

[Neywiny]

Incorrect https://en.wikipedia.org/wiki/Hearing_range#Humans

If it's 28 in perfectly ideal conditions, 23 is well within range