Main Features Shuriken PRO Pioneer Reference for Open Show Size30 cm TypeSubwoofer Maximum power1500 W Continuous power output600 W Frequency response20 Hz to 200 Hz (In-Car) Sensitivity90 (1 W/In-car) dB Impedance1 Ω or 4 Ω Dual Voice Coil (DVC) Mounting Depth142 mm Woofer Cut-Out HoleΦ282 mm Woofer materialPaper SurroundUrethane SpiderPolyester Fibre Voice Coil type4-layer Long Copper Voice Coil bobbin typeAluminium TerminalsPush MagnetsFerrite 30cm / 12″ Recom. Enclosure [l]35 (Sealed Enclosure) 50 (Ported Enclosure) Recom. Enclosure [ft3]1.24 (Sealed Enclosure) 1.77 (Ported Enclosure) Weight7.1 (Excluding accessories) kg DimensionsΦ322 x 166 mm AccessoriesSubwoofer mounting screws Thiele/Small Parameters Qts0.84 Fs [Hz]35.7 Hz Vas [ft3]8.86 Vas [l]24.3 Xmax [mm]15.