In article , Brian Gaff
wrote:
If you amplitude modulated a 40Khz ultrasonic sound that you could
obviously not hear with audio, could you hear it? I was thinking it
might be a good way to beam audio. Brian

Yes, people have indeed reported modulation high power level ultrasound to
'project' audible sounds. Works by being so loud as to function via
nonlinearity. So best avoided! Bad for the ears and for quality.

Jim

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