M3-10IB-S-Gw-4

M3 10-inch Marine Subwoofer for Infinite-Baffle Use (175 W, 4 Ω) - Gloss White 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.