JL Audio M6 Series 10" 4 ohm Marine Subwoofer w/Black Luxe Grille - M6-10IB-L-SbSb-4 [010-03869-00]M6 Series 10" 4 ohm Marine Subwoofer with Black Luxe Grille M6 10IB L SbSb 4 With an appropriate system setup, the addition of a subwoofer frees your smaller main speakers from the burden of reproducing low frequencies. This allows your whole system to play louder and to sound cleaner at all listening levels. M6 Luxe subwoofers are outfitted with a low profile mounting bezel and a fine mesh grille for minimal protrusion into cabin space. The result is