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10 Car Subwoofer Troubleshooting

If you’re reading this blog post, chances are you’ve got a subwoofer that just isn’t as loud and punchy as it used to be. This article will teach you how to the car subwoofer troubleshooting.


A car subwoofer is a speaker that reproduces low-frequency sound. It’s usually about the size of a small refrigerator and mounted somewhere in the trunk or under the back seat. It’s not only responsible for producing high-quality bass, but it also helps to balance out the frequencies from other speakers on your stereo system.

Here we are discussing some solutions for Car Subwoofer Troubleshooting:

1.Subwoofer transformer hum:

A transformer hum is usually caused by electrical interference that’s present in the occupant of the car.The most common reason for a transformer hum to develop is when extraneous electrical signals get coupled into the power lines that feed the speaker system, and then amplified by its speakers because it’s time-sensitive to those 600 or 1,200 Hz power line cycles.

If your subwoofer transformer hums, but the light on your amp is solid and you have no static, it’s most likely a grounding issue. Check all of your connections and make sure that the screws aren’t loose. If there’s still a problem, try flipping the cables around backward or sideways – it might fix it. If not, contact an audio professional to find out what to do next.

2. Subwoofer buzzing at high volume:

When your subwoofer’s buzzing, it means one of the following problems.

Check the in-dash for loose or broken connections of wires and grounding wires by examining with an inspection light.

Loose items behind the dashboard may also be creating a buzz sound when they vibrate. Remove the loose items, and then tight them back to their original positions if possible.

Tighten all screws near ground points which have not been loosened enough to cause any ill effects on electrical ground paths.

The voltage is too high for your system and you have to set the amplifier gain at a lower level.

Your speakers are wired in series and need to go through a 3-to-1 impedance matching transformer (either before or after the amp).

Your audio system should now be free of buzzing sounds at high volume levels. If you don’t have the tools and knowledge for installing your own subwoofer then call Grant Exteriors Solutions who are experts in automotive audio retrofitting.

3.why does my subwoofer cut in and out soundbar:

In this Car Subwoofer Troubleshooting, there are a few possible reasons that your subwoofer is cutting in and out soundbar.

Immediately check the connections of the speaker to the soundbar. It’s possible a wire is loose, broken, or improperly connected. unplug the power cord from the outlet for about five minutes and then turn the power back on. This should fix any short circuit problem you have with your power supply.

Check the inputs on your soundbar with other items you have plugged in such as video game consoles or laptops to make sure they are coming through clearly.

if your cables are too long or pulling against one another (or other things) too hard
to fix them so they’re not causing problems by pulling hard enough to break whatever connections they’re plugged into.

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4.subwoofer cuts out randomly

The first thing you should do is check your fuses and make sure they are not blown. If the fuse is good, then you need to test for power and ground at the speaker’s connection point(s).

You can either unplug each wire of the connector from it’s respective terminal bolt or remove the bolts from their terminals by loosening them with an Allen wrench and using a multi-meter to test for voltage drop (AC volts).

If there is no voltage present, replace that wire. Please make sure this measurement does not come across as threatening; checking wires will produce about 3 volts of electricity in any given system.
You also have an option of replacing your alternator that may be causing issues with power supply.

5.subwoofer making noise when turned on:

The noise might be the result of turning the subwoofer on while there are objects close to it. The reason for this is that a speaker vibrates when turned on, and most find it annoying at first. There are two possible solutions to this:
(1) put your feet at a speaker’s base and see if the problem lessens and
(2) move away from any nearby objects so they don’t dampen the sound waves.
If you’re satisfied with these options, then discuss the issue with your favorite brand’s customer service representative to make necessary changes.

6.subwoofer stopped working while driving

The vast majority of the time, it’s not an issue with your subwoofer(s).If it’s an electrical issue with the car such as an alternator or battery then the diodes that power the subwoofer could have been damaged. Subwoofers don’t have brains, and they aren’t really designed to be “smart” enough to know the difference between a good set of signals, and a bad or intermittent one. There are a few common possibilities for this happening:

  1. Footwell or dashboard where you’re installing the sub already has something in it that interferes with the signal/power supply line (like battery power converters)
  2. An amp fuse has blown in the amplifier itself (this is usually an easy fix)
  3. You might be getting electrical interference in your system somewhere else.

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