The importance of cables in car audio modification

When it comes to car audio modification, in addition to the four main subjects of the sound of source, pre-amp, power amp, and speaker, the most important thing is to decide the sound and the bad of the sound system is the wiring of the audio. Many people have a better understanding of the products of the four major pieces when they modify the sound.

However, the main features of the wiring were neglected, and as a result, the sound system could not achieve the desired effect. The number of wires required for a complete car audio system is also relatively large. Therefore, the interference of various frequencies generated during the driving process of the vehicle has a serious impact on the auditory environment of the car audio system. Therefore, high requirements are placed on the installation and wiring of the car audio system.

 

 
The choice of car audio cables

We started with the choice of wiring at the beginning. When we went to school, we learned the characteristics of the wires physically. The smaller the resistance, the less power we consume on the wire, which means the higher the efficiency of the system. The larger the cross-sectional area of the wire, the thicker the wire is, the smaller the resistance is, so the larger the tolerance current value of the wire. This knowledge tells us that choosing a thicker wire as much as possible when choosing a cable will have a positive effect on reducing power loss.

To pick out the power cable, the current capacity of the chosen power cable should be greater than or equal to the value of the amplifier fuse. Because if the current capacity of the wire used as the power line is lower than the standard, it is easy to generate large AC noise and seriously degrade the sound quality. The power cable may also generate heat or even burn, which may also cause hidden dangers to the safety of the vehicle.



All kinds of car cables skills

There are two types of wires that need to be clothed, one is a power cable, and the other is an RCA cable. Let's talk about the wiring skills of the power cable. When powering multiple amplifiers separately with one power line, the length from the separation point to each power amplifier wiring should be as much as possible. When the power line is bridged, a potential difference will appear between each power amplifier. This potential difference will cause AC noise, which will seriously damage the sound quality. When the host is powered directly from the power supply, it reduces noise and improves sound quality. First of all, before wiring, you should first remove the dirt at the battery joint with high-grade fine sandpaper or fine-tough, and then wipe some butter for maintenance. After that, tighten the joint. If the power connector is dirty or not tightened, it will cause poor contact and generate a choke resistor. This leads to the appearance of AC noise and severely degrades the sound quality.

The choice of power insurance is as close as possible 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 of the system × 2) / average value of vehicle power supply voltage.



The manner of the ground cable

Remove the paint at the grounding point of the car body with fine sandpaper and fix the ground cable tightly. If the paint remains between the body and the ground, the grounding point will have a contact resistance. Similar to the dirty battery connector described above, contact resistance can cause AC noise, which can seriously damage the sound quality.


Focus the grounding of the various audio equipment in the audio system at one point. If you do not focus them a little on the ground, the potential difference between the components of the audio will cause noise.

Note: The host and amplifier should be grounded separately. When the system consumes a large amount of current, the battery ground must be secure. The method of improving the grounding performance of the power supply is to use a thick-diameter wire, such as a strand, between the power supply and the ground. This enhances the connection, effectively suppressing noise and improving sound quality. Do not approach the wiring of the computer. Keep in mind that driving computer noise can occur when the host ground point is close to the ground or fixed point of the driving computer. The wire and audio cables laid in the car must be combined with the special sheath sleeve for the car.

Arrangement of the power cable

The current capacity value of the chosen power line should be equal to or greater than the value of the fuse connected to the amplifier. If a lower-standard wire is used as the power cord, AC noise is generated and the sound quality is severely broken. The power cord may heat up and burn.

When powering multiple amplifiers separately with one power line, the length from the separation point to each power amplifier wiring should be as much as possible. When the power line is bridged, a potential difference will appear between each power amplifier. This potential difference will cause AC noise, which will seriously damage the sound quality. When the host is powered directly from the power supply, it reduces noise and improves sound quality.
 
Thoroughly remove the dirt from the battery connector and tighten the connector. If the power connector is dirty or not tightened, the connector will be in poor contact. The presence of a choke resistor can cause AC noise, which can seriously damage the sound quality. Use sandpaper and fine flakes to remove dirt from the joints while wiping the butter.
 
When wiring in a car's powertrain, avoid routing wires near the generator and ignition, and generator noise and ignition noise can radiate into the power line. When the originally installed spark plug and spark plug cable are replaced with a high-performance type, the ignition spark is stronger and the ignition noise is more likely to occur. The principles followed by the power cord and the audio cable in the body are the same.



Arrangement of the RCA cable

 
Use insulating tape or heat-shrink tubing to tighten the audio signal cable connector to ensure insulation. When the connector is in contact with the vehicle body, noise can be generated.
 
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 you can't shorten the length of the audio signal cable, the extra-length will be folded instead of rolled up.

The wiring of the audio signal line should be at least 20cm away from the power supply line of the driving computer module circuit and the power amplifier. If the wiring is too close, the audio signal line picks up the noise of the frequency interference. It is best to route the audio signal cable and the power cable separately on both sides of the driver's seat and the passenger's seat.
 
Note that when wiring close to the power line and microcomputer circuit, the audio signal lines must be more than 20cm away from them. If the audio signal lines and power lines need to cross each other, we recommend intersecting at 90°.
 
When the car is driving, it will generate various frequency interferences, which will adversely affect the listening environment of the car audio system. Therefore, higher requirements are placed on the installation and wiring of the car audio system.



Car audio wiring selection:

 
The smaller the resistance of the car audio cable, the less power is consumed on the wire, and the higher the efficiency of the system. Even if the wire is very thick, a certain amount of power is lost due to the speaker itself, and the efficiency of the entire system is not 100%. The smaller the resistance of the wire, the larger the damping coefficient; the larger the damping coefficient, the greater the residual 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 power allowed to be output.