Powerbass S104X 10-Inch Single 4 Ohm Subwoofer 4-Layer Black Paper/Wool Cone - Large Roll Foam Surrounds Oversized Motor Structure - Dual And Single 4-ohm Voice Coils 2" BASV Voice Coil Formers - Chrome Push Input Terminals Pole and Aero Vented Cooling - Rigid Tooled Flat Black Steel Basket Designed For Both Small Sealed or Ported Enclosures