【text】
due tocarDuring driving, interference of various frequencies will be generated.Car stereoThe listening environment of the system has adverse effects, so higher requirements are put forward for the installation and wiring of car audio systems.
1. The choice of car audio wiring
Car audio wireresistanceThe smaller the power consumption on the wire, the higher the efficiency of the system. Even if the wire is 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%.
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. 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.
Choice of power insurance
The closer the fuse box of the main power cord is to the carAccumulatorThe better the connector, the insurance value can be determined according to the following formula: insurance value = (the sum of the total rated power of each power amplifier of the system × 2) / the average value of the vehicle power supply voltage
2. The wiring of the audio signal line
Use insulating tape or heat shrink tubing to wrap the audio signal cable joints tightly to ensure insulation. When the joints are in contact with the car body, noise may be generated.
Keep the audio signal cable as short as possible. The longer the audio signal cable is, the more likely it is to be interfered by signals of different frequencies in the car.
Note: If the leng
【text】
due tocarDuring driving, interference of various frequencies will be generated.Car stereoThe listening environment of the system has adverse effects, so higher requirements are put forward for the installation and wiring of car audio systems.
1. The choice of car audio wiring
Car audio wireresistanceThe smaller the power consumption on the wire, the higher the efficiency of the system. Even if the wire is 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%.
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. 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.
Choice of power insurance
The closer the fuse box of the main power cord is to the carAccumulatorThe better the connector, the insurance value can be determined according to the following formula: insurance value = (the sum of the total rated power of each power amplifier of the system × 2) / the average value of the vehicle power supply voltage
2. The wiring of the audio signal line
Use insulating tape or heat shrink tubing to wrap the audio signal cable joints tightly to ensure insulation. When the joints are in contact with the car body, noise may be generated.
Keep the audio signal cable as short as possible. The longer the audio signal cable is, the more likely it is to be interfered by signals of different frequencies 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 line should be at least 20cm away from the trip computer module circuit and the power cord of the power amplifier. If the wiring is too close, the audio signal line will pick up frequency interference 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 close to the power line and microcomputer circuit wiring, 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 recommend that they should cross at 90°.
3. Wiring of the power cord
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. The power cord may heat up and burn.
When using a power cord to power multiple amplifiers, the length of the wiring from the separation point to each amplifier should be the same as possible. 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.
Completely remove the dirt on the battery connector and tighten the connector. If the power connector is dirty or not tightened, the connector will have poor contact. The existence of blocking resistance will cause AC noise, which will seriously damage the sound quality. Use sandpaper and fine frustration to remove dirt from the joints, and apply butter at the same time.
When wiring in the car’s 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. The principles of wiring power cords and audio cords in the car body are the same.
4. Grounding method
Use fine 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 battery connector mentioned above, contact resistance will cause AC noise, which will seriously damage the sound quality.
Concentrate the grounding of various audio equipment in the audio system at one point. If they are not grounded at one point, the potential difference between the components of the audio will cause noise.
Note: The host and power amplifier should be grounded separately. When the system consumes a lot of current, the ground 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. Do not approach 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. The wires and audio cables laid in the car must be covered with a special car jacket.
