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Specifications: Applicable Models: Compatible with cars and vans operating on 12V power Frequency Range: 40Hz - 200Hz Rated Power: 80W Maximum Power: 100W Sensitivity: 90 dB Impedance: 4 ohms Weight: 381.5g (13.46 ounces) Dimensions: 140 x 130 x 80mm (5.5 x 5.1 x 3.1 inches) Total Harmonic Distortion (THD): < 0.01% Applicable Speaker Unit Size: 6-10 inch, 120 magnetic horn Features: 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.