JL Audio M3 Series 7.7" Marine Coaxial Speakers w/Grey Metallic Sport Grilles - M3-770X-S-Gm [010-03066-00]M3 Series 7. 7" Marine Coaxial Speakers with Grey Metallic Sport Grilles M3 770X S Gm PLAY BETTER Optimized for moderate power systems, M3 marine speakers are designed to produce powerful, smooth sound that is several steps beyond common marine speakers. Features: Amazing fidelity and affordability in marine settings Exceeds international standards for salt fog and UV exposure 3 Year Warranty DMA Optimized Woofers Proprietary motor, suspension and