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Specifications:Applicable Models: Compatible with cars and vans operating on 12V powerFrequency Range: 40Hz - 200HzRated Power: 80WMaximum Power: 100WSensitivity: 89 dBImpedance: 4 ohmsWeight: 381.5g (13.46 ounces)Dimensions: 138 x 120 x 80mm (5.43 x 4.72 x 3.15 inches)Total Harmonic Distortion (THD): < 0.01%Applicable Speaker Unit Size: 6-10 inch, 120 magnetic hornFeatures:Advanced Design: Utilizes a digital integrated chip and tube boost for low power consumption and high output.Efficient Heat Management: Equipped with a pure aluminum heat sink and control panel for optimal thermal conductivity.Enhanced Performance: Bronze copper with magnetic inductance enhances adsorption force.Built-in Protections: Safeguards against current overload, short circuit, thermal overload, and DC offset.Superior Sound Quality: Provides powerful in-car entertainment with excellent sound quality and strong bass.Easy Installation: Lightweight and simple to handle, making installation straightforward.Stable Power Release: Features large capacitors for consistent power output.Convenient Controls: Includes a switch for easy volume adjustment.High-Quality Amplification: Upgraded circuit design with Toshiba high-power tube A1941/C5198 for superior amplification and pure tweeter sound.Versatile Audio Adjustments: Offers full/low-frequency and high/low tune adjustment options, perfect for various music genres and DJ applications.Flexible Connectivity: Features 2-way line input (standard RCA and 3.5mm jack) for connection to peripheral devices like computers and mobile phones.Sound Customization: Supports full-frequency, bass selection, and adjustable low-frequency depth (BASS FREQ).Installation Instructions:Speaker Connection:Connect the amplifier board to speakers using the provided red (+) and black (-) wires.Recommended for 4-ohm 8-12 inch 45 core 100-170 magnetic bass speakers.Power Connection:A. If the car has a CD player:Connect GND to the vehicle's negative power.Connect 12V power to the positive car supply.Connect REM from the CD player to the amplifier control line for on/off control.B. If the car does not have a CD player:Connect GND to the car's negative power.Connect both +12V and REM to the positive 12V car power (REM switch can control amplifier function).C. Direct battery connection:Connect GND to the battery negative terminal.