SeaKing Stores › 10in subwoofer - 4ohm DVC - black - M1D4-10B 10in subwoofer - 4ohm DVC - black - M1D4-10B £270.00 10in subwoofer - 4ohm DVC - black - M1D4-10B. M1 Color Optix marine subwoofer with 10 in cone, DVC 4Ω / 300 W RMS / 1,200 W peak; Black grille. Add To Cart Added! 10in subwoofer - 4ohm DVC - black - M1D4-10B. M1 Color Optix marine subwoofer with 10 in cone, DVC 4Ω / 300 W RMS / 1,200 W peak; Black grille.