Or replace the use of car audio sound, the sound will have a variety of noise, the noise can affect the quality and reduce the target sound, and even can not listen to the entire sound system for the noise problem, the author based on years of experience in dealing with the noise introduced of noise sources and basic troubleshooting. Related Reading: Audio not to "ring" Analysis of car audio stereo sound field and localization routine maintenance tips and four troubleshooting.


Car audio noise source and the exclusion

First, the source of the noise

Noise intrusion from the car audio system the following ways.

1, invasive power line (through the host and the amplifier power cord into the system).

2, the current through the ground (by the antenna of the ground and the amplifier ground).

3, induction by other wire harness (through the antenna and the original vehicle wiring harness induction).

4, interference with electrical appliances (electric horn, electric motors, etc.).

1,2,3 item is to be relevant.

Second, measures to cope with noise

Generally used to deal with noise, spare parts, auto car capacitors or coaxial capacitor (to high frequency noise is particularly effective), Ecuador flow loop (inductance), LC filter, grounding wire, and diodes.

1, to deal with the noise generated by the ignition system

Check the ignition coil to the capacitor positive electrode is installed on, such as the installation of check volume is reduced, if the reduced capacity of platinum contacts easily ablation, resulting in interference spark, need to replace the electrical capacity of 0,5 UF/400V nonpolarized capacitors . Check whether the use of high voltage ignition

carbon line, if you use wire-type prone to interference by some radio interference is serious, it must be replaced.

Can use to increase the damping resistance on the noise suppression spark, with 1 megohm resistor is connected in the ignition coil output into the main power lines, reducing the interference.

2, motor noise exclusion

First audio equipment and signal lines away from the motor and the motor line, can a non-polarized capacitors in parallel across the motor can also be the first series with two inductors are in the motor line is negative, then 2 The Promise of capacitor motors are connected to the positive and negative lines, the other end to form a filter circuit, is to absorb the carbon brush motor spark to the noise reduction.

3, the absence of noise generated by electric horn relay, remove methods include the following:

In one of the speaker terminals on the ground and then a capacitor.

- In one of the speaker terminals of a first series inductor, and then on the ground and then a capacitor.

Speaker terminals on the two methods were used -.

the speaker button in the steering wheel of a capacitor in parallel between the contacts.

4, on a relay electric horn noise, exclusion methods are the following:

Electric horn bracket with the body to be a good contact.

- At both ends of relay contacts, a capacitor in parallel, or contact the respective ends of a capacitor in parallel to the ground.

Using 3, the? And methods.

5, ground noise will be bad.

If the bonnet can not firmly grounded, the bonnet will become an antenna, the radiation noise generated by vehicles to ministries around the space, and the circuit from the antenna and the introduction of sound system. Bonnet with the body when installing cable, the contact point on the need to paint, traces of oil, dirt, etc. eliminated.

Engine (engine) and the body, or front-wheel suspension, body, between the exhaust pipe and the body should have a good connection between.

6. Power Line Noise Rejection:

For the effective elimination of power line noise, should be close to the power amplifier installed Eritrea flow loop. If multiple power amplifiers, each amplifier should be installed near a stream lap Ecuador, because the noise from a power amplifier spread to another one, so a single failure of Ecuador flow loop.

7, on the signal line (RCA) incoming noise suppression:

Signal line should stay away from power lines and power lines were installed on both sides of the body, so to avoid the potential for interference. If the signal line layer shielding mesh, the outer shield should be connected to the chassis on the network.

In practice, many problems will be encountered, it is important to first find the source of interference, and then prescribe the right medicine to solve it, make car sound system for each program are clear and pure and perfect.

Car audio noise problem is failure, the causes and the most difficult to exclude, as a vehicle structure and more complex circuits, where the noise more easily, it should have some auto electrical and car audio knowledge, excluding Failure to handy. Remedy: First, according to the noise situation, through theory analysis and determine where to find fault location, and then take a different exclusion methods. Simple shooting method, first listen to the sound of radio, tape and CD are all part of the noise, there should be checked if the power cord, ground, signal line traces the location is reasonable, signal the availability of loose skin is broken bond strap , power amplifier and the body should be insulated. True to the different noise sources, different measures to deal with, if the noise can not be excluded, the best area to find professional car audio shop with strong troubleshooting, in short, the best way to deal with noise is to get rid of the noise source , and then take noise abatement measures, this way to solve the noise.