JBL Arena S10 Black 10" 100W Powered Subwoofer with Special Edition Grilles & Logo Black 10-inch (250mm) high-output polycellulose woofer 100-watt RMS (200-watt dynamic) digital power amplifier Dual rear ports optimize airflow while minimizing port turbulence and audible distortion in the bass response Variable level, crossover, and phase controls Contemporary cabinet shape with all Black grilles provides a sophisticated, modern look