What are the basic requirements for car audio wiring?

Unlike harness arrangements for other functions, car stereo wiring has higher requirements. This article Home of Wiring Harness Engineers will walk you through the basics of car audio wiring. Because the car will produce various frequency interference during driving, it will adversely affect the hearing environment of the car audio system, which puts forward higher requirements for the installation and wiring of the car audio system. 1. Power cord wiring: The current capacity value of the selected power cord should be equal to or greater than the fuse connected to the power amplifier. If a sub-standard wire is used as the power cord, it will produce AC noise and seriously damage the ring sound quality. The power cord may heat up and burn. When a power cord is separated to multiple power amplifiers, the length from the separation point to each power amplifier should be as same as possible. When the power lines are bridged, a potential difference will occur between the power amplifiers, resulting in AC noise and seriously damaging the sound quality. The picture below shows the lamp beam, heater, etc. When the main unit is powered directly from the power supply, it will reduce the noise and improve the sound quality. Thoroughly remove the swag from the battery connector and tighten the connector. If the power connector is dirty or not tightened, the connector will have poor contact. The presence of blocking resistors can cause AC noise and seriously damage the sound quality. Remove the dirt at the joints with sandpaper and fine setbacks while wiping down the butter. When wiring in the automobile power system, wiring near the generator and ignition device should be avoided. Generator noise and ignition noise can be radiated to the power line. When the original factory-installed spark plugs and spark plug cables are replaced with high-performance types, the ignition spark is stronger and it is easier to produce ignition noise. The principles of power cords and audio cords are consistent.

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2. Grounding method: Use fine sandpaper to remove the paint at the grounding point of the car body and fix the grounding wire. If there is residual paint between the vehicle body and the ground terminal, the ground point will develop contact resistance. Similar to dirty battery connectors described above, contact resistors can cause AC noise that seriously damages sound quality. Concentrate the grounding of various sound devices in your sound system at one point. Potential differences between acoustic components can cause noise if they are not centrally grounded. 3. Selection of car audio wiring: The smaller the resistance of the car audio cable, the less power is consumed on the line, and the higher the system efficiency. Even if the wires are thick, due to the horn itself, a certain amount of power will be lost and will not make the entire system 100% efficient. The smaller the wire resistance, the greater the damping coefficient; The greater the damping coefficient, the greater the excess vibration of the horn. The larger the cross-sectional area (thicker) of the wire, the smaller the resistance, the larger the wire capacity current value, and the greater the power allowed to be output. Power insurance selection The closer the safe of the main power cord is to the car battery connector, the insurance value can be determined according to the following formula: insurance value = (sum of the total rated power of each power amplifier in the system 2)/average value of the car power supply voltage. 4. Audio signal wire wiring: Wrap the audio signal wire connector with insulating tape or heat shrinkable tube to ensure insulation. When the joint comes into contact with the vehicle body, it makes noise. Keep the audio signal line as short as possible. The longer the audio signal line, the more susceptible it is to interference from various frequency signals in the car. Note: If the length of the audio signal cable cannot be shortened, the extra-long part should be folded instead of rolled up. The wiring of the audio signal cable should be at least 20 cm away from the driving computer module circuit and the power cord of the power amplifier. If the wiring is too close, the audio signal line will emit noise with frequency interference. It is best to distribute the audio signal and power cords on both sides of the driver's and passenger's seats. Note that when approaching the power cord. When wiring the microcomputer circuit, the audio signal line must be more than 20 cm away. If the audio signal and power cords need to be crossed with each other, we recommend doing so preferably within 90 degrees.

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