Rockford Fosgate M1-8B 8" Color Optix Marine Speakers Subwoofers The ML1800-3 can be used

The ML1800-3 can be used with compatible passive crossover hardware or an active crossover and amplifier arrangement

That range gives installers options when matching compatible subwoofer wiring configurations

The Rockford Fosgate M2D2-12IB is a 12-inch marine subwoofer designed for infinite-baffle installations

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Rockford Fosgate M1-8B 8" Color Optix Marine Speakers Subwoofers The ML1800-3 can be usedThe Rockford Fosgate M1 8B is a pair of 8 inch, 2 way coaxial marine speakers designed for boats, powersports vehicles, and other exposed installations. They provide a full range audio upgrade where conventional speakers may be vulnerable to water spray, salt, vibration, and ultraviolet exposure. The black grille and trim presentation suits darker interior and exterior marine installations. Each speaker uses a 4 ohm design with a 1 inch balanced dome