Chess, I'm pretty much with you.

Based on my experience, I absolutely DO NOT believe that ALL frequencies below 80Hz are nondirectional. So, I don't want them all coming from the same place in the room.

Likewise, for nondirectional frequencies, given adequate amplification, why WOULDN'T I want a balanced approach using more transducers (to eliminate room nodes)?

IF you've got the necessary power, I just don't understand why you wouldn't play full-range speakers full-range.

bibere usque ad hilaritatem