Built to handle extreme marine environments, these coaxial speakers deliver exceptional sound and marine-grade durability. They’re water-resistant, UV-resistant and ASTM B117 salt-spray compliant for long-term offshore performance. Corrosion-resistant 6-1/2" polypropylene speakers generate 135 watts. Enjoy the entire sound spectrum with a 65Hz to 20kHz frequency range. Dome tweeters with PEI neodymium magnet produces high-end frequencies eight times stronger than conventional magnets. Mounting diameter: 6-1/2". Mounting depth: 2-1/3".