SeaKing Stores › 12in sealed-enclosure subwoofer - 4ohm DVC - white - M2D4-12S 12in sealed-enclosure subwoofer - 4ohm DVC - white - M2D4-12S £495.00 12in sealed-enclosure subwoofer - 4ohm DVC - white - M2D4-12S. M2 premium Color Optix marine subwoofer intended for sealed-enclosure installations. 12 in; DVC 4Ω / 400 W RMS / 1,600 W peak; White grille. Add To Cart Added! 12in sealed-enclosure subwoofer - 4ohm DVC - white - M2D4-12S. M2 premium Color Optix marine subwoofer intended for sealed-enclosure installations. 12 in; DVC 4Ω / 400 W RMS / 1,600 W peak; White grille.