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A comment on Killing the 3.5mm Jack: How Simple Is Changing into Needlessly Complicated. Parent comment

Re:Killing the 3.5mm Jack: How Simple Is Changing into Needl... by crististm on Monday June 13, 2016 @05:00PM (#11897590)
I have my doubts that humans can hear above 20kHz.

It's more likely that the sound produced by those devices, even if ultrasonic, may produce intermodulations in the audible range.

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Re:Killing the 3.5mm Jack: How Simple Is Changing into Needl... by mschuster91 on Monday June 13, 2016 @05:19PM (#11897742)
28 kHz is in fact correct, although only in lab conditions:

> The commonly stated range of human hearing is 20 Hz to 20 kHz. Under ideal laboratory conditions, humans can hear sound as low as 12 Hz and as high as 28 kHz, though the threshold increases sharply at 15 kHz in adults, corresponding to the last auditory channel of the cochlea.

(ref: https://en.wikipedia.org/wiki/Hearing_range)

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