Kicker 49KM604W KM 6.5" 4? Marine Coaxial Speakers - Pair Add great looks and stellar full-range sound with this coaxial marine speaker, made to thrive in your boat for years to come. Kicker doesn't just say its “marine ready”, they prove it! Their speakers meet or exceed industry standards for Salt/Fog and UV exposure, as tested by the ASTM. UV treatments on the coaxials' injection-molded cones, Rubber surrounds, baskets and grilles help all models maintain in marine environments. These speakers can endure almost any weather conditions with splash-and-spray-resisting sealed motors, cones and locking terminal covers. Speaker hardware is forged from rustproof, 316L stainless-steel. Spectacular highs and midrange sounds coupled with the simplest of speaker installations, provide full-range audio specifically for a marine environment. Features: Spectacular Highs And Smooth, Impactful Midrange Made Specifically For Marine With Sealed Motor And Polymer Basket UV-Treated Polypropylene Woofer With Rubber Surround Stainless Steel Hardware Included White Grill And Basket Will Not Yellow Or Fade ASTM Tested For UV And Salt/Fog Exposure This KM 6.5-Inch Speaker works best with 50 watts of recommended power. See below for more details. Specifications: Woofer(in,mm): 6-1/2, 160 Tweeter(in,mm): 1/2, 13 Tweeter Dome Material: PEI Rated Impedance(?): 4 Peak Power (watts, per ANSI/CTA-2031-A): 150 Recommended Amplifier Power (watts RMS): 15-50 Sensitivity(1W,1m): 90 Frequency Response(Hz): 35-21k Mounting Hole Diameter(in,mm): 5-3/16, 132 Mounting Depth(in,mm): 2-1/2, 62 Grilles: White, non-removable.