KMW10 10-Inch (25cm) Marine Subwoofer (4-Ohm),RoHS Compliant Designed specifically for boat audio with weather-proof qualities that meet or exceed industry standards. Features an injection molded cone and tough Santoprene surround, both UV-treated to combat the weather. Made specifically for your watercraft, with splash-and-spray sealed components and rustproof hardware. ASTM tested for UV and salt-fog/moisture exposure. The deepest bass designed by engineers responsible for award-winning subwoofers since 1980. Specifications Woofer(in,mm)Free Air Application 10,25 Peak Power Handling(Watts) 300 Continuous Power Handling(Watts RMS) 150 Sealed Enclosure Volume Min-Max(ft³, L) 1-2.4, 28.3-68 Vented Enclosure Volume Min-Max(ft³, L) 1.25-1.75, 35.4-49.6 Frequency Response(Hz) 30-500 Mounting Depth(in, cm) 5, 12.7 Mounting Hole Diameter(in, cm) 9-1/4, 23.3