How to Repair a Subwoofer?

Do you want to know How to repair a subwoofer then read this blog? A subwoofer can be a great addition to your car’s audio system. Many people like the extra bass that comes from a subwoofer and having one can make your car sound like a concert hall.

However, it is not uncommon for the subwoofer to break down. If you own a car and it has a subwoofer installed in it, then the chances are that you will at some point in time need to repair it.

It is a very frustrating and time-consuming job. The good news is, it’s not hard to repair a subwoofer. In this blog post, I will be giving you all of the tips and tricks that you will need in order to repair your damaged subwoofer.

Steps Involved to Repair a Subwoofer

There are certain steps that explain how to repair your subwoofer?

Related Post: The 4 Best 12-inch Subwoofer

Assess the Voice Coil

When you decide it’s time to get your subwoofer, you will want to make sure that everything is in working order. You can start by checking your speaker voice coil, which helps to increase the current running through the speaker when amplified.

This is the trickiest part of the process, but armed with a basic knowledge of electronics and some diagnostic equipment like a multimeter, you will be able to figure out if there are any issues present.

It is better to use a multimeter to measure the speaker impedance by setting the meter to read ohms or resistance. The internal resistance of a speaker coil is lowered when an electric current moves through it.

This change in value should show up on the multimeter dial which will be called a measurement of voice coil working condition. However, if your meter shows no movement, then there may be a problem because the meter doesn’t show resistance or a result means that you have got a broken or burnt voice coil.

Check the Speaker Cone

If the voice coil is still in good shape, move on to the next component, which is the speaker cone. The trick to assessing this part of the speaker is that you have to gently push it across its circumference.

It should return into shape, but if it remains rigid, then this is a sure sign that your speaker cone has been damaged and needs replacement.

Detach the Speaker from its Frame

Once you have identified where the problem is, being able to identify the issue will be easier from here. If a quick test using a multimeter reveals a shorted voice coil, don’t hesitate to replace the voice coil.

Once you have removed your speaker from its enclosure let’s get started with what you’ll need to complete this process. Other things you’ll need include an adjustable wrench and protective eyewear if necessary.

Now that we’ve gathered our tools together as well as any replacement parts, we may need for this job let’s begin by assembling all of your supplies on a work surface.

Remove the Speaker Surround

Before taking out the speaker, remove at least one of the screws that fasten the material to its base. To do this we recommend using a Phillips-type screwdriver. Once you have taken out one or all of the screws.

You will not need any tools or knives to take off and expose the woofer and the front-facing wire. It should be noted that before you begin your repair, you might want to take off any plastic covering from around it so as to unplug everything properly. This will prevent further complicating matters during your repair.

Related Post: The 4 Best Soundbar Under 300

Remove the Voice Coil and Speaker Cone

The next step is to remove the voice coil and speaker cone. This is done with the help of a sharp instrument like the putty knife or tester edge; but it can also be achieved by using your hand carefully, too.

Gently remove the speaker cone, spider, and voice coil carefully from each other while keeping all components in place separately.

Replacing the Voice Coil

The voice coil is just as important as any other part of the subwoofer. Without it, you won’t be able to project sound easily, so this part should really be prioritized.

The voice coil usually sits at the center of the subwoofer, but if it isn’t located in that way then it shouldn’t be a problem. One tip for this is to check if there are any loose parts on the subwoofer itself because these could interfere with placing the new voice coil where it would best fit.

Fix the Speaker Frame

Now that the new coil is in place, the next thing you’ll need to do is put back the speaker’s enclosure. First, you will have to position it so that it perfectly fits over the cone and speaker frame.

Next step – glue! Apply glue around the edges of where your surround will be in contact with the speaker’s sides which in our case is about half an inch in height in order to both holds down your surround in place while also strengthening these sections of material.

Once again, you need to wait for another 24 hours before applying some pressure to test if everything went correctly.

Reassemble and Fix Other Parts

The last step is to put the things back to their original place. The first thing you’ll need to do is actually reattach the wires. Take the terminal wires on the new voice coil and attach them to where the old terminals were.

Try pushing the cone gently along your side, and do this across its entire circumference. If it sinks in and back into place, then congratulations. If not, there’s a good chance it’s time for you to put this project on hold for now.

If the new cone doesn’t come with wires attached, try attaching it with shorter wires to the terminal wires and punch some small holes into the new cone.

Push the wires through the holes you’ve created to the new cone while using your soldering iron to hold them in place. Connect all of your components back together again.

Fit your subwoofer into its enclosure and tighten it firmly together with mounting screws. Connect your newly fixed subwoofer to the radio and enjoy quality audio.


This article will give you one of the best ways to repair a subwoofer. By knowing exactly what to do and what to look for, you should be able to repair any problems you might end up running into.

There’s no sense in paying someone to do a job you can do yourself. If you own a subwoofer and it seems to be having problems with its sound, one of the first steps you should take is to examine the amplifier.

If the amp is malfunctioning, it can cause a variety of problems with your subwoofer. The best way to avoid damaging a speaker is to always use a crossover and amplifier to drive the speaker.

Never use the speaker without a crossover and amplifier and most important of all, use a speaker that is designed for use in a car and is not a home speaker.  I hope that you will understand that how to repair a subwoofer.

For more information about woofers visit other blog posts on our website.

Leave a Comment