Current Overload, Short Circuits, Thermal Overload, DC Offset.Mono 1000 Car Audio Amplifier gives you a incar entertainment., good sound quality, no distortion, give you a great hearing enjoyment.Light weight, and easy to install.Powerful bass.Wiring:1. Speaker connection: amplifier board has a good piece of red and black wire welding can be accessed by a 48 Euro 100150W bass or fullrange speaker or speakers (red pick horn , black pick speaker is recommended to use 4 ohm 812 inch 45 core 100170 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 REM CD player connected to the control line (sothe 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 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: PA80DProduct Name: Car AmplifierSubwoofer Type: Subwoofer SpeakerOperating Voltage: 12VFrequency Response: 30Hz~280KHzRated Power: 600WPower: 1000WImpedance: 48: 105dBA: less than 0.1%Size: 23.5x15.5cm (LxW)knob color: random colors, 't 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 +/ 13cm.