Hertz DBA 200.3 car audio subwoofer box is an active subwoofer system with a 200 mm (8 in.) subwoofer and two passive radiators of the same size, powered by a 140 W amplifier built-in to the back of the enclosure. A control panel is used to adjust frequency, level, and acoustic phase according to one’s own listening tastes. The system was designed to satisfy those who love the most demanding low frequency in a compact size, for use in any vehicle.