DTS-20, a.k.a. the tower of power, is simply the most powerful, lowest frequency reproducing subwoofer on the planet. Solid output down to 16 Hz, single digit distortion and incomparably low group delay put this amazing subwoofer in a class by itself. The Tower of Power has removable covers that allow 2 choices for the location of the acoustical output - depending on the installation orientation you choose.