Cerwin Vega Pro Cva-118X 18-Inch Activeseries High Performance Subwoofer Compact 1,400-Watt active subwoofer with 18" woofer Custom 18" low frequency and full body bass response with a custom woofer for extreme power High power output: 700 Watts continuous and 1,400 Watts peak Built-in system amplification optimized for the specified woofer Master/Slave output allows for daisy-chaining multiple subs