Quote:
Originally Posted by Aleron Ives
Since 44.1 kHz is enough to represent all frequencies audible to human ears, this is not a technical flaw, unless you care to provide ABX results demonstrating that you can hear frequencies above 20 kHz. 
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Not anymore.
I used to hear CRT TV flyback singing, Ultrasonic motion detectors used in alarms and traffic light triggers in the 70's.