Re: Something for the next firmware update
Kinect mic can pick up stuff that is outside normal human range.
That's below 16Hz and above 20KHz (mybe 22K for some people). Your standard TV set won't be able to play them. Also could make dogs annoyed as they actually hear ultra sound and that's one of the ways to have the dogs perform at the circus.
Then you may have young kids hear the ultra sound and have very unpleasant effect even causing headache (still clearly remember the high pitch 15625Hz of horizontal flyback transformer)
Using infrasound (sub 20Hz) is quite as dangerous. "Low frequency sound can cause people to have unusual experiences even though they cannot consciously detect infrasound"
Basically putting sound waves outside the hearing spectrum (and being able to reproduce them in the physical world) can result in class lawsuits.