Alpine R2-W10D2 R Series 10" subwoofer with dual 2-ohm voice coils

Product info: 10" subwoofer with dual 2-ohm voice coils Kevlar reinforced pulp cone with HAMR Santoprene rubber surround frequency response: 26-200 Hz power handling: 300-750 watts RMS (375 watts per coil) peak power: 2250 watts sensitivity: 82.3 dB top-mount depth: 5.975" mounting height: 0.8" sealed box volume: 0.48-0.93 cu. ft. ported box volume: 0.83-1.38 cu. ft. grille not included warranty: 1 year Alpine R2-W10D2 owner's manual One 10" Dual 2-ohm voice coil subwoofer Plastic trim ring Two 4.5" jumper wires (each wire has a single banana connector on both ends) Application guide (English/ French) On-line product registration information Warranty information (English/ French) Important Notice (English /French) Features and Specs Size 10-inch Impedance (Ohms) 1, 4 Cone Material Kevlar Reinforced Paper Surround Material Santoprene Rubber Basket Material Aluminum Grille None included Free-Air No Dual Voice Coil Yes Sensitivity 82.3 dB at 1 watt Frequency Response 26 - 200 Hz Max RMS Power Handling 750 Peak Power Handling (Watts) 2250 Top Mount Depth (inches) 6 Bottom Mount Depth (inches) N/A Cutout Diameter or Length (inches) 9 1/8 Frame Width 10.456 Frame Length 10.456 Vas (liters) 18.2 Fs (Hz) 31 Qts 0.47 Xmax (millimeters) 20 Parts Warranty 1 Year Labor Warranty 1 Year Box Requirements Ideal Sealed Box Volume (cubic feet) 0.58 Minimum Sealed Box Volume (cubic feet) 0.48 Maximum Sealed Box Volume (cubic feet) 0.93 Ideal Ported Box Volume (cubic feet) 1.33 Minimum Ported Box Volume (cubic feet) 0.83 Maximum Ported Box Volume (cubic feet) 1.38 Port diameter (inches) N/A Port length (inches) N/A