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"It's been a while since we heard about BG Radia's THX Ultra2-certified in-wall subwoofers, the BGX-4850, so we were pretty happy to see that AVGuide put them to a review.  Word to the wise -- don't scoff at the small 4-inch drivers used in this subwoofer; by packing 48 of those little cones into each module in a kind of boxer style layout (Porsche and Subaru fans take note), the BGX-4850 (combined with a 2,200-Watt amp and a healthy dollop of DSP) turned loose sub-20Hz response that the reviewer ate up.  No smudgy, slow, plodding bass here -- quite the opposite, actually.  The reviewer said the transient response may outpace some of the primary speakers with which it's paired; something good is going on here.  Good enough, in fact, to net perfect 10s for everything but the \"value\" portion of the competition; somehow you just knew that $7,000 tag would catch a snag somewhere along the way."^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.engadget.com/2009/06/10/bg-radias-bgx-4850-in-wall-subwoofer-shakes-loose-a-rave-review/>