[Wayne A. Pflughaupt]

But I have been facing some problems still, one of which is subwoofer locatability at certain frequencies. And I'm not just talking about the frequencies which are known to be directional, but also below 80 hz.

Some people, it seems, can localize lower frequencies. I’m one of them, too. However, I expect it’s the upper subwoofer frequencies that we localize, not the lower ones. It seems like the sub is always easy to localize because almost any bass signal is a “mixture” or frequencies and harmonics, not a pure tone.

As far as what to do about it, all I can come up with is play some 12-octave sine waves from 20 Hz and up, and see at what point you are able to localize the sub, then move your crossover frequency accordingly. Sonnie has some sine waves at his BFD Set Up Guide. You can download them and burn a disc. Look at the graphs in my subwoofer comparison test sticky thread at our Subwoofers Forum for the 12-octave intervals.

Regards,
Wayne