Definitive Technology SuperCube III 120v Subwoofer (Single, Black) (Discontinued by Manufacturer) Single, supercube amplified subwoofer speaker Equipped with one 7.5-inch long-throw driver to two 7.5-inch pressure-driven infrasonic bass radiators Built-in 650 watts digitally-switching amplifier Frequency response: 16Hz - 200Hz High quality finish in piano gloss black