Kicker 45KMF124 is a 12-inch KMF Series free-air marine subwoofer for boat bass systems. The free-air design gives boat owners a weather-resistant low-frequency upgrade that can be integrated without a traditional enclosure. Key Performance Features Marine subwoofer for boat bass systems 250 W RMS power handling 4 Ω nominal impedance Weather-resistant construction for marine use Designed for free-air applications Marine Durability Designed for boat, powersports, and outdoor audio environments when used in the intended application Weather-resistant materials for UV, moisture, and salt/fog exposure Corrosion-resistant construction details support marine installation use System Architecture Type: Free-Air Marine Subwoofer Application: Boat bass system Nominal Impedance: 4 Ω Passive / Powered: Passive subwoofer; amplifier required Power Handling / Output Continuous Power Handling (RMS): 250 W Peak Power Handling: Not provided Driver / Construction 12 in. woofer Weather-proof marine subwoofer construction Sealed motor structure for marine use Locking terminal cover Single voice coil configuration Installation Use Cases Boat bass upgrades in marine audio systems Free-air panel or baffle-mounted marine installations Marine systems requiring weather-resistant subwoofer construction Technical Specifications Brand: Kicker Series: KMF Series Model: 45KMF124 Size: 12 in. Impedance: 4 Ω Power Handling (RMS): 250 W Identifiers & Packaging MPN: 45KMF124 UPC: 713034084808 Sold As: Single subwoofer Included Components: One marine subwoofer, mounting hardware, documentation Why Buy From MCOR Automotive Authorized retailer for the brands we sell Specialists in marine, powersports, and vehicle audio upgrades Expert support for speaker, amplifier, and system-matching decisions