Thanks bridgman. No trick question, just a sincere desire to understand if I was missing anything obvious.

The real reason to go all the way through to 20 Khz is for the educational experience. It was interesting that my hearing pooped out around 16 Khz, but my boys were still able to hear beyond that when we were playing around with this tone generator.

My room is also pretty large (opens to other rooms really), is oddly shaped, and I seem to have some holes in certain frequencies (but don't have enough experience to know what frequency/ies without going through this experiment).

Can anyone tell me what the frequency bands are that correspond to bass, mid-bass, mid-range (and any subdivisions of that band), etc?

Thanks!
Rich