KICKER 51MWF104 10" 400 Watt RMS Marine Boat Free Air Subwoofer 4-Ohm Sub

The MWF104 is a 10-inch free-air marine subwoofer built to mount directly to a baffle and use the space behind it instead of a dedicated box. That makes it the answer for boats and powersports builds where storage volume is too valuable to give up to an enclosure. It handles 200 to 400W RMS at 4 Ohms with 800W peak and covers 20 to 500Hz.

The cone is polypropylene co-molded to a TPE surround, a pairing that stays stiff under load while resisting water, sun, and temperature swings. A polycarbonate bridge seated on a ribbed silicone gasket forms a vibration-resistant seal at the mounting surface, which matters even more in a free-air install where the baffle itself does the work of an enclosure. The glass-infused nylon basket takes heat and abuse better than stamped steel. KICKER Real Marine construction adds marine-compliant terminals and splash-and-spray resistance, and the sub meets or exceeds ASTM B117 200-hour salt/fog and ASTM G154 400-hour accelerated UV testing.

Mounting takes a 9-1/16-inch hole with 5-3/16 inches of depth and an 11-inch outer diameter. Use a solid, well-braced baffle with a large sealed volume behind it; a thin panel may need a backing plate to stay rigid under load.

RGBW LED lighting is built in for night use. A charcoal grille is included and the MWGW white grille is sold separately. Common placements include bow storage bulkheads, helm panels, pontoon side walls, and under-seat baffles in side-by-sides.