Alpine S2-W8D2 S-Series 8" subwoofer with dual 2-ohm voice coils

Product info: 8" subwoofer with dual 2-ohm voice coils carbon fiber/polypropylene cone with HAMR rubber surround frequency response: 35-215 Hz power handling: 300 watts RMS (150 watts per coil) peak power handling: 900 watts sensitivity: 82.6 dB top-mount depth: 3.825" mounting height: 0.825" sealed box volume: 0.18-0.53 cubic feet ported box volume: 0.38-0.73 cubic feet grille not included warranty: 1 year Alpine S2-W8D2 owner's manual One 8" Dual 2-ohm voice coil subwoofer Trim ring (installed) Two 3" jumper cables (each has a single banana connector on both ends) Subwoofer Application Guide (English/ French) On-line product registration information (English/ French/ Spanish) Warranty information (English/ French) Important Notice! (English/ French) Features and Specs Size 8-inch Impedance (Ohms) 1, 4 Cone Material Carbon Fiber/Polypropylene Surround Material Rubber Basket Material Steel Grille None included Free-Air No Dual Voice Coil Yes Sensitivity 82.6 dB at 1 watt Frequency Response 35 - 215 Hz Max RMS Power Handling 300 Peak Power Handling (Watts) 900 Top Mount Depth (inches) 3 7/8 Bottom Mount Depth (inches) N/A Cutout Diameter or Length (inches) 6 7/8 Frame Width 8.268 Frame Length 8.268 Vas (liters) 7.2 Fs (Hz) 46.5 Qts 0.59 Xmax (millimeters) 10 Parts Warranty 1 Year Labor Warranty 1 Year Box Requirements Ideal Sealed Box Volume (cubic feet) 0.3 Minimum Sealed Box Volume (cubic feet) 0.18 Maximum Sealed Box Volume (cubic feet) 0.53 Ideal Ported Box Volume (cubic feet) 0.61 Minimum Ported Box Volume (cubic feet) 0.38 Maximum Ported Box Volume (cubic feet) 0.73 Port diameter (inches) N/A Port length (inches) N/A