Have you ever listened to your favourite radio station and noticed that a sudden loud hum had invaded your car? If so, you may want to have a look at this article.

You may wonder why your car amplifier is producing a low frequency hum. And you may have tried to fix it yourself by looking at all possible causes, such as bad electrical connection or loose connection.

Maybe you have tried everything, and it’s driving you crazy. Well, don’t worry, just let us know. We’ll do it for you, free of charge. In this article, we will try to guide you on how to remove humming noise from car amplifiers and what are its causes.

This will help you in the future to prevent this annoying problem.


A humming noise can be caused by two notes playing simultaneously. The two notes are perfect.
Or a humming noise is a type of musical sound produced by a single note repeated quickly with a small gap between each repetition.


The interference of the electrical waves from the car’s power system should be stopped.
For your safety, please keep one important thing, don’t work with electricity if you are not sure how to work with it.

If you want to avoid electrical shock when working on the system, you should permanently remove the power from the battery.


Now we will provide you with a detailed explanation of what causes the car humming noise from amplifier and how to resolve it.

  1. Connections between wires that are loose
  2. Power corrupted
  3. A bad ground connection
  4. An overloaded wire
  5. Fluorescent lighting.
  6. Electromagnetic Interference

If you’re driving your car and suddenly hear a humming noise while playing music through the car audio system, the sound you hear could result from several factors. The good news is that if you can locate the noise source, you can eliminate it from making itself known again.

The first thing to consider is whether the humming noise comes from the amplifier itself or a speaker and whether the sound is constant or intermittent. A constant hum may indicate a problem with the amplifier itself, whereas an intermittent hum indicates a loose wire.

Also Read: Signs of Bad Car Amplifier

Connections between wires that are loose

It may seem like a no-brainer, but it’s worth checking your wiring to ensure it is connected correctly. The reason is simple – if your wiring isn’t connected correctly, the amplifier may have no power and no sound.

The wiring should have the following three connections to work:

The positive terminal should be connected to the red connector on the amplifier’s rear panel. The negative terminal should be attached to the black connector at the back of the amplifier’s rear panel. The speaker connector should be connected to the speaker terminals on the amplifier’s rear panel.

If you follow the wiring instructions and correct the wiring, the amplifier should make no sound. But if the wiring isn’t correct, there could be a problem with the amp. If the wiring is correct, there are several more things you should check.

First, ensure the speaker terminals are firmly attached to the amplifier. Second, check whether the speaker’s volume control knob is in the middle or the maximum position. This will give you more volume. Third, if the amplifier is a stereo unit, try moving the volume control knob up or down.

A Distribution Block should be installed
An easy solution to a poor connection between the battery and the system would be to install a high-quality power distribution block.

The Fit Kit’s innovatie design provides you with the ability to keep your battery cables, wires, hoses, clamps and connectors organized and protected from damage.

Big Three
When it comes to electrical upgrades for your vehicle, the “Big Three” are the most cost-effective solutions to give you more power.

You’ll need to buy and install your car audio system parts. These items can all be used while an automobile audio system is being installed, so you’ll save time and energy.

All critical electrical components on the car have a ground wire that should be connected to the car’s chassis. Some of these include the battery, the alternator, the starter, the ignition switch, the radio, and other small parts.

Connect the head unit properly

With the best installation skill, you can try to check the wire at the back of the head unit. The best way to avoid problems when installing a car stereo system is first to check if there are no loose wires inside the Loose wires are a possibility with every head unit.

Power corrupted
This is the second most common cause of a humming noise in a car amplifier, and it is often the result of dirty wiring. To test for dirty power, use a non-contact voltage tester (you can find them online) to check for voltage on the wires.
If you find voltage on the wires, the next step is to turn off the amplifier and remove the battery for about ten minutes.

If there’s no voltage, then you have a problem. The best way to clean the wiring is to strip it back to bare metal. You’ll need a wire stripper and a wire brush. Start with the power wires at the rear of the car.

These are usually located near the fuse box. Cut the bare ends off, and using the brush, brush any dirt and debris off the wires. Next, cut the wires at the front of the car. These will be located near the fuse box or in the dash. They should also be cleaned.

A bad ground connection
If that doesn’t work, and you suspect it may be a bad ground, disconnect the ground lead and run a voltage test on the other wires.

And if the wire is touching the metal frame of the car, the ground may not be properly connected. This is something you should check when replacing your car’s speakers.

How to solve a bad ground connection problem?

If it’s your ground issue, then it’s easy to solve. Add another wire to the frame and connect it to the negative and positive terminals. Make sure you connect the negative terminal to the battery and the positive terminal to the positive wire from the speaker. You’ll know it’s working when you hear the hum stopped.

Your amplifier should be fitted with an RCA cable filter

If you have a RCA line to your amp, you can put a filter on it. The noise in the system will be reduced, and you will not have to spend your time looking for a problem or figuring out where to start is very important to get a quality RCA (resistor-capacitor) filter to effectively de-noise your RCA cable.

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For the amplifier to function correctly, it needs a strong signal. You will need two RCA patch cables to get the signal from your power amp to your receiver.

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Cleaning your battery terminals will return life to an older battery. Batteries aren’t designed always to provide the same amount of power and they sometimes require a

If you want to be a more efficient cleaner, cleaning the posts with this brush will make this task very easy.
If you have no time to do it then get a new one.

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Add an AUX filter inline
You can check the wires at the back of the head unit if you want to limit the noise or install a filter at the head unit if you want to keep the noise down. If you don’t use an AUX line input, you may not be able to get your music from your phone to your speakers. You should skip this step if you are not.

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An overloaded wire

If the wire is too thick, you need to change it out. You’ll have to use a thinner wire and connect it to the frame.
If the wire is too thin, you’ll need to replace the wire.
If you find no voltage on any other wires, you’ll need to replace the amplifier.

Also Read: What are the Causes that Make a Car Amplifier Hot

Fluorescent Lighting

If you hear a humming noise that doesn’t stop once you check the wiring, it could be a problem with the fluorescent lights in your vehicle. It’s worth turning these lights off for about an hour to see if the noise goes away.

There may be a loose connection somewhere in the light fixture if it does. If you’re driving around with a loose wire, the connection may cause sparks or smoke to come out of the fuse box.

This is not normal and should be fixed immediately by replacing the faulty fuse with a new one. If you’re looking for an easy way to repair a loose wire in your car’s lighting system, the best solution is to go to a trusted automotive repair shop.

Electromagnetic Interference

If there is a loose connection or you are using an old speaker, you might be experiencing EM interference. This is when a device with a high-frequency signal picks up another device with a similar frequency. Move your power or RCA cables away from each other.

When possible, this must be done for the entire length of the car, to avoid interference from the power cables. If you haven’t laid the cables yet, you should not run the power cables on the same side of the vehicle. Separating the two cables will reduce the possibility of interference in the audio system.

RCA cables of high quality should be used

Low quality cables don’t have the proper shielding to prevent interference and noise. High-quality RCA cables ensure proper noise shielding and increased sound quality.

Power cables should be of high quality

The kit you got is buzzing after someone installed it. It’s possible that your power cables aren’t sufficiently insulated not to cause interference with your audio system.


Q.1 Why does my car make a humming noise?

You should take your vehicle to a repair shop when it has any of the following symptoms: A low-pitched humming, an engine revving, loud knocking, smoke or other signs of engine trouble.

If your car makes a humming noise it’s probably the differential needs lubricant, the transmission is failing or the universal joints or wheel bearings are wearing out.

Q.2 why does my car stereo make a buzzing sound?

The interference of the electrical waves from the car’s power systems is the most likely cause. Multiple noises can be causing an issue. It was possible for me to drill down my issue to ground loop noise.


If you have a hum, buzz or static, you should start by checking the connections and the wires. You should also check the wires for loose connections of an amplifier, head unit, battery and speakers. For bad ground connection, separate the RCA cables filter, use AUX filter inline,

To avoid electromagnetic interference, Move your power or RCA cables away from each other and use high-quality power and RCA cables. So here we have covered the topic of how to remove humming noise from car amplifier, including its reason to happen and their solutions.

We hope this will help you to resolve your problem. Please share this article with your friends to save them from this irritating problem during driving with your dearest relations.