Powerbass S10TD 10-Inch Dual 4 Ohm Thin Subwoofer Thin Mount Woofer Design - Fiber Composite Turbine Basket Single Piece Custom Injected Molded Cone - Large Roll Rubber Surround Oversized Motor Structure - Dual And Single 4-ohm Voice Coils 2" Vented KSV Voice Coil Former - Chrome Push Terminals Optimally Designed for Small Sealed Enclosures