JBL Bass Pro 8 – 8 20cm Car Bass Reflex Amplified Ported 200W Active Subwoofer. JBL’s Latest Powered Subwoofer System Provides Big Output in a Small Package with built in amplifier! JBL BassPro 8 Slot-Port Enclosure. JBL’s slot-port enclosure is engineered and “tuned” to the optimal frequency by the JBL engineering team. The enclosure material is MDF (medium-density fibreboard) to minimize resonances and unwanted ring. Lightweight but stiff polypropylene woofer cone provides clean reproduction and superior durability in an easy listening or high-volume venue. Built-in Class D 100 watts RMS amplifier. The JBL subwoofer system’s built-in amplifier provides electronics matched and optimized for woofer characteristics and enclosure acoustics. Class D operation also means the amplifier runs cooler and draws less current from the vehicle’s electrical system. JBL RBC Wired Remote. The RBC Wired Remote (optional) is an easy installation and can be mounted for convenient volume adjustment from the driver’s seat, which sells separately. Active subwoofer (with enclosure). Box Size (mm) – 250 x 285 x 263 x 203. Size of loudspeaker (mm) – 200 (8.0). Frequency range (Hz) – 30 – 200. Nominal power RMS (W) – 100. Maximal power (W) – 200.