REAudio Sex V2-15D4 750W 15-Inch Sex Series Dual 4 Ohm Subwoofer Dual composite 2-piece cone; Rubatek foam surround; Cast aluminum basket Tork-Tite terminal; 3-Inch 4-layer aluminum voice coil FEA optimized motor structure Double stack magnets; Progressive spiders Power handling: 750W / Impedance: Dual 4 ohm