Adding a subwoofer to your vehicle’s audio system may be the most important upgrade you could make to it. Subwoofers come in a variety of sizes and configurations. Whether you're adding bass to a factory system or building a trophy-winning competition system, JBL has a subwoofer for your application. Each JBL subwoofer can be interfaced with a variety of enclosures, from pre-made to custom-made for your specific vehicle.