Wiring 1 Speaker connection Amplifier board has a good piece of red and black wire welding can be accessed by a 4 8 Euro100 150W bass or full range speaker or speakers red pick horn black pick speaker is recommended to use 4 ohm8 12 inch 45 core 100 170 magnetic bass 2 Power connectionA Car has a CD player GND then negative vehicle power 12V 12V power supply connected to the car s positive REMCD 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 12Vcar 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 positivebattery simultaneouslySpecification Max Power 1000WRated Power 600WTHD 0 01 Frequency Response 30Hz 280KHzOperating Voltage 12VImpedance 4 SNR 105dBAPackage Included 1 X Car Audio Amplifier