Rockville RV8.1A 400w 8" Loaded Car Subwoofer Enclosure+Mono Amplifier+Amp Kit Rockville RV8.1A Single 8" Bass Enclosure System With matching Mono Block Amplifier 400 Watts Peak Power / 125 Watts RMS CEA-2031 Rating Quasi Transmission Line Cabinet Design Bonded, Stapled and Braced 3/5" MDF Cabinet Computer Designed, Under-Side Bass Reflex, Aero-Port System