This is the Klipsch KSW-12..the 12" sub, and I have been very happy with it.  Great sub sound that shakes the entire room and my air conditioning vents.  I have though, on occasion, overloaded it to the point of  a "pop"; so I have the sub set on "8" out of 11 and I can crank any movie, and the sub responds with tremendous amount of room-shaking bass!