Current Overload, Short Circuits, Thermal Overload, DC Offset.Mono 1000 Watts Car Audio Amplifier gives you a wonderful in-car entertainment.High , good sound quality, no distortion, give you a great hearing enjoyment.Light weight, handy and easy to install.Powerful .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 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 )2. connectionA. Car has a CD player : GND then negative vehicle 12V 12V supply connected to the car s positive REM CD player connected to the control line (sothe CD player can directly control the subwoofer amplifier on and off )B. Car no CD player : GND connected to the negative of the car , + 12V and REM connected together in positive 12V car ( + 12V can also be an indirectone 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.Specification:Model: PA-80DProduct Name: Car AmplifierSubwoofer Type: Subwoofer SpeakerOperating Voltage: 12VFrequency Response: 30Hz~280KHzRated : 600W-: 1000WImpedance: 4-8SNR: 105dBATHD: less than 01%Size: 235x155cm (LxW)knob color: random colors, dont accept the specified colorcolour: blackMaterial: metalPackage Contents:1 x Car Audio Amplifier BoardOnly the above package content, other products are not included.Note: Light 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.