Current Overload, Short Circuits, Thermal Overload, DC Offset. 1000 Car Audio Amplifier gives you a in-car entertainment. , good sound quality, no distortion, give you a great hearing enjoyment. Light weight, and easy to install. Powerful bass. Model: PA-80D Product Name: Car Amplifier Subwoofer Type: Subwoofer Speaker Channels: 1-Channel Operating Voltage: 12V Frequency Response: 30Hz~280KHz Rated Power: 600W -Power: 1000W Impedance: 4-8 : 105dBA :Less than 0.1% Wiring: 1. Speaker connection: amplifier board has a good piece of red and black wire welding can be accessed by a 4-8 Euro 100-150W bass or full-range speaker or speakers (red pick horn + , black pick speaker - is recommended to use 4 ohm 8-12 inch 45 core 100-170 magnetic bass ) 2. Power connection A. Car has a CD player : GND then negative vehicle power 12V 12V power supply connected to the car s positive REM CD player connected to the control line (so the CD player can directly control the subwoofer amplifier ) B. Car no CD player : GND connected to the negative power of the car , + 12V and REM connected together in positive 12V car power ( + 12V can also be an indirect one with REM switch control amplifier switching function ) C. Directly with the battery (battery) connection : GND connect the battery negative , + 12V and 12V REM then the positive battery simultaneously . Colour:black Material:Aluminum alloy Size:25.5x15.5cm Package Contents: 1 x Car Audio Amplifier Board Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.