KICKER KMF12 12" Weather-Proof Subwoofer f/Freeair Applications - 4-Ohm [45KMF124]KMF12 12" Weather Proof Subwoofer for Freeair Applications 4 Ohm The KICKER KMF 12 inch Marine Subwoofer makes serious bass no enclosure necessary! Made to take the power and the weather, this sub is custom made to bang in your boat. Packed with features and made for marine, KICKER gives you the deep, loud bass your boat needs with the KMF series of subs. Features: Four Ohm Voice Coil Injection Molded Polypropylene Cone Co molded Santoprene Surround