Basic knowledge of car audio wiring

due toCar stereoThe listening environment of the system has a lot of adverse effects on the listening effect, so thecarThe installation and wiring of the sound system puts forward higher requirements.
1. The choice of car audio wiring.
(1) Car audio cableresistanceThe smaller the power consumption on the wire, the higher the efficiency of the system. Even if the wire is very thick, a certain amount of power will be lost due to the speaker itself, and the efficiency of the entire system will not reach 100%.
(2) The smaller the resistance of the wire, the larger the damping coefficient; the larger the damping coefficient, the greater the redundant vibration of the horn.
(3) The larger the cross-sectional area of ​​the wire (the thicker), the smaller the resistance, and the larger the tolerance current value of the wire, the greater the allowable output power.
(4) The choice of power supply insurance.The closer the fuse box of the main power cord is to the carAccumulatorThe better, the insurance value can be determined according to the following formula:
Insurance value = (the sum of the total rated power of the power amplifiers of the system × 2) / the average value of the car power supply voltage G?
2. The wiring of the audio signal line
(1) Wrap the audio signal cable joints tightly with insulating tape to ensure insulation. When the joints are in contact with the car body, noise may be generated.
(2) Keep the audio signal line as short as possible. The longer the audio signal line, the more susceptible to interference from noise signals. Note: If the length of the audio signal cable cannot be shortened, the extra-long part should be folded instead of rolled up.
(3) The wiring of the audio signal line should be at least 20cm away from the power line of the trip computer unit and the power amplifier. If the wiring is too close, the audio signal line will pick up induced noise. It is best to separate the audio signal cable and the power cable on both sides of the driver's seat and the passenger's seat. Note that when wiring close to the power line and the microcomputer unit, the audio signal line must be more than 20cm away from them. If the audio signal line and the power line need to cross each other, we suggest that it is best to cross at 90°.
3. Wiring of the power cord
(1) The current capacity value of the selected power cord should be equal to or greater than the value of the fuse connected to the power amplifier. If lower than standard wire is used as the power cord, AC noise will be generated and the sound quality will be seriously damaged.
(2) When a power cord is used to separate multiple power amplifiers, the length and structure of the wiring from the separation point to each power amplifier should be the same. When the power line is bridged, there will be a potential difference between the power amplifiers. This potential difference will cause AC noise, which will seriously damage the sound quality. When the host is powered directly from the power source, it will reduce noise and improve sound quality.
(3) Completely remove the dirt on the power supply (battery) connector, and tighten the connector. If the power connector is dirty or not tightened, there will be contact resistance at the connector. The presence of contact resistance will cause AC noise, which will seriously damage the sound quality. Use sandpaper and a fine file to remove dirt from the joints.
(4) When wiring in the automotive power system, avoidDynamoRoute the line near the ignition device, generator noise and ignition noise can radiate into the power line.When the original factory installedSpark plugWhen the spark plug cable is replaced with a high-performance type, the ignition spark will be stronger, and ignition noise will be more likely to be generated at this time.
(5) The principles for wiring power cords and audio cords in the car body are the same.
4. Grounding method
(1) Use sandpaper to remove the paint at the grounding point of the car body, and fix the grounding wire tightly. If the paint remains between the car body and the grounding terminal, contact resistance will be generated at the grounding point. Similar to the dirty-colored power connector described above, contact resistance will cause AC noise, which will seriously damage the sound quality.
(2) Concentrate the grounding of each module in the audio system in one place. If they are not grounded in one place, the potential difference between the components of the audio will cause noise. Note: The host and power amplifier should be grounded separately.
(3) When the system consumes a lot of current, the grounding terminal of the battery must be firm. The way to improve the grounding performance of the power supply is to use thick-diameter wires, such as stranded wires, between the power supply and the ground. Doing so can strengthen the connection, effectively suppress noise and improve sound quality.
(4) Do not close the wiring of the trip computer. Please keep in mind that when the grounding point of the host computer is close to the grounding point or fixed point of the trip computer, the trip computer noise will be generated.