KICKER Marine products are Real Marine.® KICKER M-Class Premium products feature key moisture-deterring characteristics that set them apart as a true product line built to use in the outdoors. It’s all Real Marine. Component system design for increased mounting options and sonic accuracy Carbon-fiber-infused midrange cones for highly accurate sound reproduction Weather- and UV-resistant, 28mm Tetoron® textile-dome, audiophile tweeters Internal Butterworth 12dB/octave crossovers for superior smoothness and protection Corrosion-resistant, water-proof connectors for speakers and lighting Glass-filled nylon woofer baskets for excellent thermal performance and toughness Equipped with RGBW LED lighting for endless colors along your boat interior walls Includes both white and charcoal grilles Tetoron is a registered trademark of TORAY INDUSTRIES.Specifications Product Dimension Sheet 51MS Dimensions Woofers (in, mm) 8, 200 Tweeters (in, mm) 1-1/8, 28 Tweeter Dome Material Tetoron® Rated Impedance (Ohms) 4 Rec Amp Power (watts RMS) 15-200 Peak Power Handling (watts) 400 Sensitivity (dB; 1W, 1m) 90.5 Frequency Response (Hz) 45-25k Woofer Mounting Hole Diameter (in, mm) 6-9/16, 167 Woofer Top Mount Depth (in, mm) 3-1/2, 89 Flush Mount Tweeter Hole Diameter (in, mm) 2, 51 Flush Mount Tweeter Depth (in, mm) 2-1/8, 55 Crossover 12dB/octave, high pass at 3.2Hz Grilles Charcoal and white File Downloads Manual | Download Mounting Templates | PDF Here