30 cm marine subwoofer. load capacity: 200 watts rms / 400 watts max. Impedance: 4 + 4 Ohm. Fs 28.5 Hz, Qts 0.59, VAS 107.7 litres. Sound pressure: 89 dB. Xmax: 7 mm. Black grid. Polypropylene membran more→e with UV protection, black. Aramid fibre resistant to moisture, cracks, wear and tear. Can be used in closed, bass reflex or free air. Installation depth: 122 mm. Installation opening: 2 mm. 76 mm.