These 8-inch marine speakers are an outstanding sub for cars & marines designed to easily handle extreme conditions. The subwoofer features 900 W peak power, a titanium-plated composite cone, and a butyl rubber surround that delivers exceptional performance. Polk's proprietary Dynamic Balance technology ensures a distortion-free response with wide sound dispersion, utilizing laser imaging to identify best combination of speaker materials. The result is a marine subwoofer that produces powerful bass in even the toughest environments. With IP56 Advanced Ultra-Marine certification, these speakers resist corrosion thanks to sealed waterproof surrounds, a composite cone, stainless steel mounting hardware, and an ABS basket. Among high-end car audio subwoofers, it excels on road trips, appreciated by car owners, car audio installers, and any car audio enthusiast. Polk's dedication to advanced technology and engineering is evident in its powerful speaker series, smart speakers, soundbars, and more. They strive to bring the best-in-class audio experience to their customers. Whether you are looking for a powerful marine speakers or a complete audio system for your home, Polk has you covered.