10" Subwoofer - 400W Features Forced-Air Cooling* - 20% cooler for increased reliability, Signature red double stitching makes an outstanding bond between the improved Santoprene surround and polypropylene woofer cone, A UV-resistant cone and surround help make the CompRT sound great wherever you go, High mass, solid pole piece for heat dissipation, Dual-voice coils for installation flexibility, Less than 5* deep