SeaKing Stores › 10in sealed-enclosure subwoofer - 4ohm DVC - black - M2D4-10SB 10in sealed-enclosure subwoofer - 4ohm DVC - black - M2D4-10SB £385.00 10in sealed-enclosure subwoofer - 4ohm DVC - black - M2D4-10SB. M2 premium Color Optix marine subwoofer intended for sealed-enclosure installations. 10 in; DVC 4Ω / 400 W RMS / 1,600 W peak; Black grille. Add To Cart Added! 10in sealed-enclosure subwoofer - 4ohm DVC - black - M2D4-10SB. M2 premium Color Optix marine subwoofer intended for sealed-enclosure installations. 10 in; DVC 4Ω / 400 W RMS / 1,600 W peak; Black grille.