SeaKing Stores › 12in sealed-enclosure subwoofer - 2ohm DVC - black - M2D2-12SB 12in sealed-enclosure subwoofer - 2ohm DVC - black - M2D2-12SB £495.00 12in sealed-enclosure subwoofer - 2ohm DVC - black - M2D2-12SB. M2 premium Color Optix marine subwoofer intended for sealed-enclosure installations. 12 in; DVC 2Ω / 400 W RMS / 1,600 W peak; Black grille. Add To Cart Added! 12in sealed-enclosure subwoofer - 2ohm DVC - black - M2D2-12SB. M2 premium Color Optix marine subwoofer intended for sealed-enclosure installations. 12 in; DVC 2Ω / 400 W RMS / 1,600 W peak; Black grille.