Cerwin Vega 12" High-Performance Subwoofer Dual Voice Coil Cerwin Vega Mobile subwoofers are designed and engineered to produce extreme bass in your vehicle and the VMAX12D4 12" dual 4-ohm subwoofer is no exception. Packing in a Klippel optimized motor structure along with a 3-inch voice coil, this subwoofer is built to deliver you nothing but quality bass. Its frame is also made from heavy-duty industrial-strength cast aluminum so it can take a beating day in and day out. See below for more features and specifications Features: Heavy Industrial Strength Aluminum Cast Frame Treated Semi-Pressed Pulped Cone Elevated Motor Structure for Increased Cooling Oversized Spider Black coated 3 Inch Voice Coil for Higher Thermal Capability Oversized Polished Black Chrome Terminals Shorting Ring for Lower Distortion Polished Bumped Backplate Klippel Optimized Motor/Suspension Symmetry RMS Power: 1000 Watts Max Power: 2000 Watts Nominal Impedance: Dual 4 Ohm Mounting Depth: 6.6" Cut-Out Diameter: 11.25" SPL: 86.9dB QMS: 4.49 QES: 0.48 QTS: 0.44 Fs (Hz): 32.9 Vas (L): 44.2 CMS (mm/N): 0.12 XMAX (mm): 14 This listing is for one (1) VMAX12D4 Cerwin Vega subwoofer.