Notice: Do not ship to " PO Box " this address Item Features: Skar Audio engineered the IX-10 D4 10-inch car subwoofer to be the best sounding and most powerful driver in it's class. This subwoofer is designed and built with so many premium features it's hard to believe it is a budget friendly model. Featuring a dual 4 ohm, high temperature, 2" copper voice coil which is combined with a powerful ferrite motor, the IX-10 D4 is conservatively rated at 200 watts RMS and 400 watts max power. Not only do these subwoofers have the ability to get very loud, they also sound great and produce strong, accurate, and powerful low end frequency response. Utilizing a high strength paper cone, superior foam surround, and designed with advanced air flow cooling, the reliability and overall performance of this subwoofer is unmatched. Sold individually. Specifications Skar Audio IX-10 D4 - 10" Component Car Subwoofer Dual 4 Ohm Voice Coil Configuration Peak Power: 400 Watts RMS Power: 200 Watts Pressed Paper Cone Advanced Air Flow Cooling System 2" BASV High Temperature Copper Voice Coil Frequency Response: 28 - 325 Hz Sensitivity: 84.4 dB Fs: 37.4 Hz Re: 7.1 Ohms Qms: 4.90 Qes: 0.83 Qts: 0.71 Rms: 3.2 Kg/s Cms: 0.183 mm/N Bl: 14.1 n/a Vas: 28.4 L Xmax: 7 mm Enclosure Specifications Sealed Volume: 1.00 ft^3 Ported Volume: 1.25 ft^3 Mounting Depth: 4.85" Cut-Out Diameter: 9.13" Magnet Diameter: 5.51" Subwoofer Displacement: 0.036 ft^3