Model Subwoofer Box Diameter 30 cm / 12″ Power Handling (RMS) 350 Watts Impedance 4 Ohms Net Volume 37 L / 1.31 cu.ft. Subwoofer GZIW 300 Dimensions (B x H x T1/T2) 460 x 320 x 327/255 mm / 18.11 x 12.60 x 12.87/10.04″.