JBL GT-BassPro12 
Add amazing bass in very little space. The JBL® GT-BassPro12 powered subwoofer is the easy way to add high-output, low-distortion bass to a car audio system. Its Slipstream port design delivers deep, bottom-end bass while minimizing port noise. It also features improved motor-structure venting for thermal protection, a progressive spider to ensure superior mechanical reliability and an amplifier that delivers maximum power and flexibility. And with the system’s remote level control, which lets you adjust bass level while driving, the only time you’ll need to stop is for gas. GT-BassPro12 at a glance: * 12" (305mm) polypropylene cone * Built-in 150-watt amplifier * Remote level control * Progressive spider * Vented polepiece * Slipstream port * Oversized, dual-stacked magnets * Speaker-level and line-level inputs * Automatic on/off function * Oversized speaker-protection bars