2. Prepare materials. Audio users need a regulated power supply from 220VAC to 12VDC, and the current is greater than 3A. Car CD is a multifunctional combination of CD+ radio+power amplifier. It is enough to buy two speakers. In order to pursue better results, you can buy four speakers. Of course, the channels supported by car CD should also be considered comprehensively. The low-end car CD only supports two speakers. Buy a 4 ohm horn, which is the most common horn impedance of car stereo. You can also use a 6 ohm 8 ohm speaker, but the effect is not good and it is easy to burn out the machine. Generally, there is a complicated socket behind the car stereo. Without such a corresponding plug, it is time-consuming and laborious to connect the power supply and the speaker output. It is suggested to buy the corresponding socket on Taobao according to the audio model, which is more convenient for wiring. Finally, for the sake of beauty, it is suggested to prepare a shell for the sound.
3. International standard of wire harness color. For the new mainframe on the market, the color of the tail wire harness will be defined according to international standards. Yellow: 12V power supply, connected to normal live wire. Red: Turn on the power cord and connect the ACC power cord controlled by the key. Black: grounding, grounding or grounding wire. Blue: the starting line of the radio antenna is connected with the starting line of the electric antenna or the power supply of the antenna amplifier. White strip: the power-on control line of the remote controller is connected to the next-level power amplifier, processor and other equipment. Orange: small light line, a small line connecting the original car. Pink: mute line, connected to the mute control terminal of other electrical equipment. White: positive pole of left front horn wire. White strip: negative pole of left front corner line. Gray: positive electrode of right front corner line. Gray system: negative electrode of right front corner line. Purple: Right rear horn wire positive pole. Purple system: right rear horn wire positive pole. Green: positive pole of left rear horn wire. Green system: negative pole of left rear horn wire.