Package Includes:

• (1) JVC KS-DR2004D 600w 4-Channel Marine Amplifier ATV/UTV/Classic Car Class-D Amp
• (2) Pair Rockville MS525B 5.25" 400 Watt Waterproof Marine Boat Speakers 2-Way Black

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Specifications:

• Efficient Class D Design
• 50 watts RMS x 4ch @ 4Ω
• 75 watts RMS x 4ch @ 2Ω
• 150 watts RMS x 2ch @ 4Ω
• 75 watts x 2 + 150 watts x 1 @ 4Ω
• Frequency Response: 10-35kHz (+0/-3dB) 20-20kHz (+0/-1dB)
• Selectable, Variable HPF/LPF (50-200Hz, -12dB/octave)
• Channel Mode Control (2ch or 4ch)
• RCA / Speaker Level Inputs
• Input sensitivity 4–12V (Speaker Level) 0.2–5V (RCA Level)
• Signal Sensing Turn-On
• In-Line Fuse with Rubber Cover (40A)
• Amp Dimensions: 7-13/16 x 1-15/16 x 4-1/8

Strong Protection Performance:

• Waterproof & Dustproof IPX7/IPX6 Certified
• Saltspray-proof ASTM B117 Corrosion Test Passed
• Vibration-proof 3-Axis Multi-frequency Vibration Test Passed
• Featuring Corrosion-Resistant Sealed Cast Aluminum Chassis with Silicon Seals, and Pigtail Cables with Molded Strain Relief Bushings
• Stainless Steel Bottom Plate Assembly Screws
• Efficient & Compact Class D Design Allows to Install Anywhere in ATV/UTV, Watercraft, Motorcycle, Golf Cart, Classic Cars and etc.

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Video of MS525:

What's In the Box:

• 2 Speakers
• Installation Hardware: (8 Stainless Steel Screws + 8 Stainless Steel Speed Clips)
• Mounting Template
• Owner's Manual
• Warranty Card

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: F70*F32*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

^{Owner's Manual​}