Infinity Reference Basslink II 250-Watt Dual 10-Inch Powered Subwoofer System (Black) for $236.95

250-Watt powered subwoofer system with vertical or horizontal mounting to fit tight spaces. Square 10-inch subwoofer and 10-inch passive radiator maximize cone area and provide more bass output from a smaller housing. Expansion slot for optional 35 Watt x 4 system amplifier with phantom center channel control. User-adjustable input sensitivity, crossover frequency and bass-boost to optimize for any installation. Included remote bass level control; One-year warranty