[Eeyore]

Greg Locock wrote:

Practically speaking we want to produce a noticeable reduction in the noise
level, across a useful volume of space. That can be done in a large arbitrary
volume, using several mics and several sound sources.

If we can go one step further and colocate source and corrector then it can be
done more simply. Alternatively if the corrector can be introduced into the
primary noise path then it is also easier.

This has been demonstrated many times.

AT LOW FREQUENCIES ONLY !

Graham