The M1D4-8B Color Optix 8-Inch DVC 4-Ohm subwoofer delivers loud . clear . accurate bass . and light the way for your journey! The M1D4-8B subwoofer is designed to pair with the Rockford Fosgate Color Optix Controller and RF Connect App . allowing you to choose from 30 different color scrolling options or choose any fixed color from the color wheel (PMX-RGB Color Optix Controller sold separately). The speed and brightness can also be dialed in to compliment and customize every installation.The Element Ready design and IP67 certification makes this subwoofer truly purpose-built for marine or motorsport applications where protection from damaging UV rays and water spray is essential.The Color Optix series creates a true marine ecosystem . utilizing Deutsch and Amphenol connections . while retaining conventional spade terminals . to provide advanced marine plug-and-play connectivity.