Brand New JL Audio 12W0V3-4 12" 300 Watt 4 Ohm Car Stereo Subwoofer with DMA Optimized Motor SystemFeatures: * JL Audio 12W0V3-4 12" 4 Ohm Subwoofer * Impedance: 4 ohms * Patented Elevated Frame Cooling * Most Real Excursion In its class * Highly Linea, DMA Optimized Motor System * Designed for use in compact sealed or medium-size ported enclosures * Lead-wire system woven into spider * Metallic silver frame finish * Mineral-Filled Polypropylene Cone * Peak Power Handling: 1000 Watts * RMS Power Handling: 500 Watts * Nitrile Butadiene Rubber Material * Thermal Power Handling Output: 300 Watt * Free Air Resonance (Fs): 28.43 Hz * DC Resistance (Re): 4.280 ohm * Sensitivity: 85.64 dB * Electrical "Q" (Qes): 0.715 * Mechanical "Q" (Qms): 10.709 * Total Speaker "Q" (Qts): 0.670 * Driver Displacement: 0.048 cu. ft. * Equivalent Compliance (Vas): 2.530 cu. ft. * Xmax Linear Excursion: 0.45" * Reference Efficiency (no): 0.221% * Efficiency (1W/1m): 5.64 dB SPL * Effective Piston Area (Sd): 74.509 sq. in. * Net Weight: 8.11 lbs