Error in the automotive acoustics, caused by a malfunction of the amplifier

Sometimes, the driver notices that his car audio system is not working as it should. For example, marked squeaks, pops, distortions or even complete loss of sound. Of course, the reasons for this may be many, and one option is to avtousilitelya fault. Although usually I think of him as a last resort, but in vain.

Possible problems with audio playback associated with disturbances in the car amplifier

The list of possible problems in the sound system caused by malfunctions of the amplifier is quite high. Let's look at the ones that are the most common, as well as options for their elimination.

It does not work the subwoofer, but the power is supplied

If the subwoofer is turned on, but the sound can not be seen, then check the connection and any other external devices are correct: radio and speakers.

At first look, whether if the signal at the output of the radio. The car owner can do this in any way available to him. Please note that normally the signal from the recorder to an amplifier via a cable with connector type «tulip». However, there are some models equipped with special socket for connecting low frequency channels. Check the signal output can be connected to the device in any headphones.

The next step is checked whether there is a terminal of the amplifier to the input signal. If subwoofer plays, but the signal on the corresponding side of the radio is input, the most probable cause — the problem is car amplifier. This may be due to failure of transistors at the output or a broken pin on the integrated circuit. Independently eliminate such a defect is difficult, requires special knowledge, it is best to contact the service center.

The subwoofer is silent, and the speakers play

If the speakers are connected and working fine, and the unit may not play a sound, it is likely that the defect must be sought in the amplifier circuit. For example, this can happen due to the burnout of the semiconductor elements on the output stage.

You can also run into a situation that the subwoofer is in the worker himself, but can not play. In this case, when you touch the input terminals of the amplifier is heard a distinctive hum. In this situation necessarily checked whether the audio signal with car radio channel arrives at LF. The problem may be broken wires, poor contact or an amplifier fault. If faulty amplifier, contacts are normal, but the subwoofer does not work, please check the subwoofer

.

When work refuses a passive system, this may result in breakage of the voice coil of the loudspeaker, or the malfunction or recorder amp. The automobile bass are fairly common case of a system where the voice coils are burned. This occurs when the passive woofer with the amplifier is supplied peak power, significantly more than the limit permitted by the manufacturer values.

From the speaker can be heard wheezing and other interference

A similar anomaly when sound transmission often occurs due to the fact that a signal like «trimmed» amplifier. The cause may be an overload from the subwoofer or other speakers. That is, the amplifier is not able to provide all acoustic components necessary amount of energy. In addition, car audio systems to creak can cause blown or loose wires.

To pinpoint the cause, first we must compare the amplifier rated power and the connected speakers. If the amplifier is weak, it is necessary to replace no more powerful model, while distortion will not. If the power matches the needs of the acoustics, it is necessary to look for a problem in the wiring or grounding amplifier.

The amplifier does not work, does not even include

must submit to it a certain capacity and to provide a device for grounding of the amplifier. Therefore, as soon as the problems with the inclusion of the first step is to check the power supply. First is to see the state of the remote connection wire, if there is voltage on it. This wire is powered by the radio, and it should not be less than 5 V. If the voltage is below this noted, it is necessary to evaluate the condition of the fuses. Maybe some of them burned. Then it should be replaced.

If the remote wire is normal, go to the power supply. Here the voltage indicator should be higher than is generally required for the amplifier 12B with the engine stopped and running at about 14.4V. If the power cord has shown the voltage is below this level, it is necessary to assess the state of the connection locations, and fuses.

If both voltage wires has a normal value, it is necessary to check the grounding. If it is weak or non-existent, this may cause a malfunction of the amplifier.

If fuses with wires and everything is good, grounding is also available, and the amplifier stopped working, most likely the case in the device itself. That is, it is necessary to buy a new amplifier to replace.

Installation and setup of amplifiers

To avoid potential problems is necessary at the stage of your amp all prepare carefully and think. It is particularly important to everything correctly installed and configured.

The hazards of improper installation of the amplifier?

Failure to comply with the rules and requirements for the installation and connection of the amplifier — this is one of the most common causes of problems. Proper installation — the deposit is not only a quality of sound transmission, but also the long-term operation of all components. When you install the speakers and connect them to the amplifier is important to answer several questions:

• Where and how best to place the device?
• How to connect an amplifier?
• How to arrange the wiring, so the wires do not interfere?
• How to connect a subwoofer?
• What should be the resistance of the coils in speakers?

If at any stage of the installation to make a mistake, it can negatively affect the quality of sound, or even withdraw individual system components fail. In some case can even happen wiring fire, so do not ignore the rule's installation work must be carried out strictly in accordance with the established rules.

How to configure the amplifier?

Errors in sensitivity fielding, incorrect use of filters or bassboost — All this can lead not only to a reduction in sound quality and the appearance of interference, but even to the speaker output of the system.

When you set up any sophisticated acoustic equipment, power is not an exception, it is important to correctly set all the main operating parameters of the device, in particular? it concerns the settings, such as:

• Gain (gain) — adjusts the input sensitivity of the amplifier, it is this parameter is important in accordance with the radio. Said the regulator value in volts, that they measure the sensitivity, can be misleading. The lower the B, the higher the sensitivity, and consequently, the dynamics will play louder, and vice versa.
• LPF — is a low pass filter (LPF), which is used to limit the tweeter, leaving only the lower range. Subwoofer recommended value of 50-80 Hz, to remove the frequency for which the woofer is not intended. For midrange speakers is recommended to set a limit on the level of 1400-1600 Hz.
• Subsonic — is a high pass filter (HPF), it is used to limit the infrasound. The default value is recommended to be set at 20-25 Hz. An experienced user can adjust this setting on their own, often with the help provided by reducing the load and prevents excessive stroke of the diffuser. Easily select the desired value, this should in turn involve the sinuses below the frequency of the subwoofer enclosure, and at this time to monitor the size of the diffuser turn. Thus, you can quickly determine the best value.
• Bassboost — This option, which allows you to increase the volume on the set frequency, usually around 40-45 Hz. Only here we must be very attentive and careful, because the use of bassboost may lead to the fact that the woofer burn, if you choose the wrong settings. Therefore, beginners are advised not to touch bassboost settings. Experienced he music lover can use it to increase the shelf frequency response, eliminating failures at certain frequencies, but there is still a risk, we have to act very carefully.
• Phase Control — element-depth settings, it can be used to change the phase of the speaker.
• Master/Slave — A switch, which is required in the construction of a bridge amplifier into a single system. Master — main amplifier, connect it to the wires from the car stereo. Slave — dependent amplifier that is connected to the second principal.

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