POWERFUL SUBWOOFER FOR CAR & MARINE - The Polk DB842 SVC 8 inch Marine Certified Subwoofer is a space-saving sub with 750W peak power & has a polypropylene woofer cone & a durable Santoprene surround built to handle power for car audio subwoofers CAR AUDIO HARD-HITTING BASS - With Dynamic Balance Technology, a Polk Audio proprietary, the marine 8 inch subwoofer uses laser imaging to get the best combination of speaker materials, ensuring distortion-free response with wide sound dispersion SPLASH-PROOF SOUND SYSTEM - Polk DB+ series speakers give thunderous sonic output in freshwater boats, motorcycles, ATVs & more, doubling as a marine subwoofer with IP56 marine certification & coated steel baskets; tested for salt-fog, UV & humidity WALLET-FRIENDLY POLK AUDIO SUBWOOFER - Experience powerful and smooth bass like never before with this compact 8 subwoofer; designed with cutting-edge technology and premium materials, this affordable sub is the ultimate choice for an audio system POLK'S CONSTANT INNOVATION & UNWAVERING COMMITMENT - With advanced technology plus engineering, Polk bring out best in class audio with speaker series, smart speakers, soundbars, plus compact subwoofer options, allowing you to listen with your heart