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Features: Pair Rockville MS525B 5.25" 400 Watt Waterproof Marine Boat Speakers 2-Way White Peak Power: 400 Watts per pair / 200 Watts each RMS Power: 200 Watts per pair / 100 Watts each Injection Molded Polypropylene Cone Aluminum voice coil with ASV winding Cloth surrounds Impedance: 4 Ohm Frequency Response: 110Hz - 20 Khz Sensitivity:87dB @1w/1m High quality magnet: 6 Oz Y30 Ferrite magnet 1" inch ASV voice coil IP56 waterproof Fully Marinized Against Salt & Fresh Water Conditions Completely Waterproof and rustproof at level IP56 Anti-UV molded ABS plastic basket & grill Pre-installed mounting screws included Perfect for marine, outdoor, and car use 1" inch Tweeter: (PEI Diaphragm with NdFeB magnet) Injection Molded Polypropylene Dust Cap SPL: 87dB ± 2dB (at 1M / 1W) Resonant Frequency (F0) 120Hz + or - 20% at 1V 3MM plate and 3 MM T-yoke Total Diameter: 5.79" Cutout Diameter in Inches for Mounting: 5.31" Total Height: 2.56" Mounting Depth in inches:1.85'' Shipping weight: 2.42 Lbs Shipping Dimensions:6" x 6" x 5.7" T/S Parameters: Magnet weight in OZ:6 OZ Magnet details:Φ70*Φ32*10 Fs:142 Hz Re:3.2 ohms Qes:2.08 Qts:1.3 Qms:3.467 Vas:1.712L Cms:195.49UM/N Bl:2.967 MMS:6.4g XMAX:1.5 mm SD:78.54 cm2 Pair of Rockville MAC525B 5.25" black aluminum can wakeboard tower enclosures Includes precision molded, high impact plastic inserts for tower fitment from 2" diameter to 2.5" diameter Mounting Depth: 5.5" Inches (140mm) Mounting Hole Diameter: 4.8" Inches (122mm) Outside Diameter:6.6" Inches (168mm) Screw Diameter: 5.4" Inches (139mm)