The BB212S is a dual 12" subwoofer with both a rich and fast low end. It's the big brother to the SB12S, using the same 12" high excursion driver. This 12" driver has a powerful motor and impressively fast transient response while still allowing for a compact box. If you're after the Buried Audio signature rich low end, but still having the kicks hit you like a shotgun this is the sub for you!