Infinity Basslink 200-Watt, Dual 10-Inch Powered Subwoofer System (Black) Powered subwoofer with onboard 200-Watt Class D amplifier Variable electronic crossover (50Hz to 120Hz), sensitivity, and bass-boost 10-Inch subwoofer and 10-inch passive radiator Variable Bass EQ (+3db to -6 db at 45Hz) Includes Basslink LC remote bass-level control