I admit that even after following this thread and the links, it seems counter-intuitive that you could get low AND powerful bass from the little H-boxes or similar dipoles due to cancellation. Guess I'll have to surf some more and maybe try one. For sure having a major null at 90 deg would be wonderful for DJ use where the speakers are often at either end of an 8' table. That Meyers rig looks very interesting, anybody know how the rear woofers can be both additive and produce a 25db null behind the enclosure?