BG Sub Takes Unusual Shape

BG's THX-certified BGX-4850 is an in-wall sub that fits into a 7 by 26.5 inch space with standard 2x4 construction. Backed with an external 2200-watt amp, it uses a series of four-inch cones paired off and facing one another, a strategy known as mass balancing. It was demoed amid the sonic chaos of the show floor and did produce good bass.