Quote Originally Posted by Zilch View Post
Subwoofers, yes, mutual coupling below a specific frequency, Thom.

It's in the Eargle pro sound system design manual here:

http://www.jblpro.com/pages/tech_lib.htm

Even those interfere with each other, but it's pretty hard getting much differential distance to the listener in comparison to low frequency wavelengths when they're both mounted in the same box.

They can be "steered" with delay or placement offsets in separate boxes, tho....
I'm reading. You must be retired.