Package Included 1 X Car Audio Amplifier Board Brand new and reliable high quality mono 1000 Watts Car Audio Amplifier gives you a wonderful in-car entertainment. Current /Amperage Overload, Short Circuits, Thermal Overload,DC Offset Specifications 1. Model: PA-80D 2. Max Power: 1000W 3. Rated Power: 600W 4. THD: 0.01% 5. Frequency Response:30Hz~280KHz 6. Operating Voltage:12V 7. Impedance:4? 8. SNR: 105dBA 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 on and off ) 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 .