Model Active Subwoofer Box Diameter 20 cm / 8″ Amplifier Power (RMS/max.) 100 / 200 Watts Impedance 4 Ohms Net Volume 17 L / 0.60 cu.ft. Subwoofer GZIW 20 Dimensions (B x H x T1/T2) 400 x 270 x 290/230 mm / 15.75″ x 10.63″ x 11.42″/9.06″.