REAudio SXX V2-15D4 1100W 15-Inch SXXv2 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 Triple stack magnets; Progressive spiders Power handling: 1200W / Impedance: Dual 4 ohm