AUDIO SYSTEM PASSIVE UNDERSEAT Woofer Subwoofer for under the seat. Extremely heavy aluminum die-cast housing with 6.0 kg 2x passive membranes on both sides Frequency range: 35-150 Hz Impedance: 2x4 Ohm, 200/175 watts Length = 345 mm Height = 70 mm Depth = 250 mm Suitable for: 8 Inch Subwoofer box passive