JBL MS Bass Pro 10-Inch SQ  Premium-Powered Car-Audio Subwoofer System 10-Inch (250mm) square diaphragm allows the maximum radiating cone area and bass output High-efficiency, 300-watt RMS (450-watt peak) Class D amplifier Proprietary Slipstream port eliminates vent noise even at high sound pressure levels Innovative, wide-range signal inputs means easy connection to any cars audio system -OEM or aftermarket Optional wireless bass controller Works with the optional MS-WBC wireless bass controller (available separately) that wirelessly controls bass levels from a drivers seat