Fiberglass Woofer Cone with Rubber Surround The 11" (279mm) woofer cone is engineered to deliver fast and tight, deep bass with low distortion and unwanted second and third order anomalies. Built-in Class D 200W RMS amplifier The JBL subwoofer system’s built-in amplifier is optimized to work as a system with the woofer. Its Class D design runs cooler and draws less current from your vehicles electrical system making it the perfect concealed subwoofer solution. JBL's BassPro Hub Subwoofer Rattles Your Rear View Mirror The new JBL BassPro Hub subwoofer delivers show & shine performance without crowding your passengers or sacrificing cargo area. This all-in-one powered subwoofer system fits into the hub of your spare tire for a super easy installation and out of sight sound solution. The built-in Class D amp delivers 200W RMS and is designed to work with the BassPro Hub subwoofer and enclosure as a system. The 11" (279mm) feather-light fiberglass woofer cone with rubber surround delivers the signature kick and punch of JBL bass. And with over temperature protection (OTP) and over current protection (OCP) you can count on reliability at peak volume levels. The included remote control enables adjustment of crossover point, gain, phase—and a bass boost of 12dB when you're in the mood and on the move. Whether you're cruising or competing, the JBL BassPro leaves the competition behind without missing a beat.