Yamaha SW 10 Studio active bass-reflex subwoofer - 180watts, frequency response: 25Hz-150Hz, 10" LF cone, magnetically shielded, MDF enclosure, XLR input/output, level control, phase switch, LPF control (40-120Hz), power on LED. Dimensions: 328 x 459 x 476mm (WxHxD). Weight: 26.5kg.