RE Audio SEX12D4 12-Inch Composite Cone with Dual 4 Ohm Performance Woofer Dual Composite 2-piece Cone, Rubatek Foam Surround Cast Aluminum Basket, Tork-Tite Terminal 3 " 4-layer Aluminum Voice Coil, FEA Optimized Motor Structure Triple Stack Magnets, Progressive Spiders, Wrap around Rubber Gasket Nominal Impedance: Dual 4 Ohm, Power Handling: 600 W (RMS)