The car amplifier is one of the components of the audio system. However, due to its malfunction, various malfunctions in the operation of the audio system may occur, which often manifest themselves in the form of distorted sound, hissing and squealing. Also, as a result of the failure of the amplifier, the operation of the audio system often shows symptoms such as no sound from the speakers.


  • a The amplifier does not turn on
  • 2 When the amplifier is turned on, a grinding noise is clearly audible
  • 3 If there is no sound from the speakers
  • four The sound from the speakers is distorted and a hissing noise is heard
  • 5 Cracklings are heard from the loudspeakers

The amplifier does not turn on

To turn on the amplifier, it is necessary to supply it with a certain power, both from the remote control and from the power wires. In addition, it should be noted that these wires, through which power is supplied, must necessarily be properly grounded. In the event that the amplifier installed in the vehicle does not want to turn on, first of all you need to carry out diagnostics and check the condition of the circuit through which this device is powered.

First of all, it is recommended to check the voltage present on the cable of the remote control. The power supplied to this wire directly from the radio should be 5 V. If, after the measurements made, the voltage on the wire is less than 5 V, then it is necessary to check the integrity of the connection of all the cables directly to the mains device.

Also, when diagnosing, you need to make sure that there is no damage to the wires, in the form of tears or violations of the integrity of the insulation. Also, when checking the connection circuit, it is recommended to make sure that the fuses are working, as well as the integrity of the contacts.

Next, you need to diagnose the main thread. The operating voltage indicator on it, with the internal combustion engine off, should be 12 V, and with the engine on – 14.4 V. In the event that, after the diagnosis, deviations were found in the voltage on the main wire, the integrity of the connections must be checked, as well as the working condition of the fuses.

If the diagnostics of the connecting cables did not give any positive results, you need to check the effectiveness of the grounding. If it’s low or there’s no ground at all, the amplifier will malfunction or just won’t turn on.

In the event that after the above diagnostics no violations were found, then, most likely, the amplifier itself has failed. In this case, the device must be sent to the workshop for repair or replaced with a new one.

When the amplifier is turned on, a grinding noise is clearly audible

Squealing is one of the most common types of distortion that occurs during audio transmission. As a rule, this seems due to the fact that the amplifier during operation begins to “clip” the transmitted signal. The main reason for the squealing is that the amplifier, during operation, with the subwoofer and speakers connected, works in an overloaded state. Simply put, it is not able to supply connected devices with the amount of power needed for their normal functioning. Also, squeaks may appear due to burnt wires.

To resolve this problem, compare the power ratings of the speakers you are using, the connected subwoofer, and the amplifier. In the event that the rated power of the amplifier and the devices connected to it match, the cause of the squealing may be a malfunction of the speaker wire or an improperly organized grounding.

If there is no sound from the speakers

Such a malfunction can occur when the signals coming directly from the amplifier stop getting to the acoustics itself. Also, the lack of sound from the speakers may indicate that the car radio has stopped transmitting a signal at the time of the amplifier.

To eliminate this malfunction, it is necessary to diagnose and make sure that the amplifier is turned on and the necessary power level is supplied to it for normal and uninterrupted operation. After that, you need to make sure that the signal is sent directly to the amplifier from the main unit.

To check this you need to disconnect the RCA wires and then connect them to each individual test block. In this case, the user should ensure that the radio is turned on and that all cables are properly connected to the correct connectors. If such a test does not bring any positive result, it is recommended to use another set of RCA wires. This is due to the fact that in some cases the cause of the lack of sound in the speakers is due to faulty and faulty wires.

If, after reconnecting, sound appears on one output, but not on the other, then in this case it is likely that the radio has failed. In the event that there is no signal at the output of the car amplifier, this device must be removed and other speakers are connected to it, even those used in ordinary home audio systems. If after such a connection sound appears in the speakers, then the amplifier is working, and the reason for the lack of sound should be found in the car speakers.

The sound from the speakers is distorted and a hissing noise is heard

The reason for the appearance of various distortions and hiss in the speakers may be a faulty or insufficiently powerful amplifier for the playback devices (speakers) connected to it. In addition, the appearance of hissing or crackling in the speakers may be due to poor grounding or faulty wiring.

To solve this problem, you need to check the correct connection of the connecting cables, as well as the speaker cables. It should be noted that the cause of sound distortion from the speakers may be the close placement of the wire that connects the amplifier to the main unit and the ground cable, to the power wiring. In this case, it is recommended to lay the cable in such a way that it does not come into contact with earth cables or power cables. Also, the cause of hissing or distorted sound in the speakers may be a poorly made ground.

Cracklings are heard from the loudspeakers

There are many reasons why crackling is clearly heard from the speakers along with the music. As a rule, such problems arise due to problems with the operation of the amplifier or improperly installed acoustics. Additionally, crackling may occur as a result of impedance mismatch of low-frequency speaker systems.

In some cases, crackling music may appear due to the amplifier not being able to supply enough power to the subwoofer. To solve this problem, you just need to replace the subwoofer. As a general rule, a large enclosure in which a subwoofer is placed helps to get rid of crackling and other distortions that appear when listening to music.