JBL BassPro 8 bass reflex active subwoofer 8" (200 mm).

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 fiberboard) 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 on JBL website.