JL Audio M6 Series 10" SubwooferM6 10 inch Marine Subwoofer with without Transflective LED Lighting for Infinite Baffle Use (250 W, 4 ) Gunmetal Trim Ring, Titanium Sport Grille With appropriate system setup, the addition of a subwoofer allows your smaller main speakers to be free of the burden of reproducing low frequencies. This allows your whole system to play louder and to sound cleaner at all listening levels. Purpose engineered and built for real marine duty, the M6 infinite