Yamaha NS-SW500 . Subwoofer type: active, Subwoofer RMS power: 250 W, Subwoofer frequency range: 20 - 160 Hz. Power consumption (standby): 0.3 W. Colour of product: Black. Subwoofer width: 380 mm, Subwoofer depth: 420 mm, Subwoofer height: 368 mm