How to Determine if a Subwoofer Is Damaged

The subwoofer plays a crucial function in enhancing the bass in a stereo system and producing full sound when listening to music. Unfortunately, after some time, it begins to malfunction, and it no longer sounds the same. This article discusses how to identify a blown subwoofer. I will explain how to determine whether a subwoofer is blown, how to test whether it is blown, and how to repair a blown subwoofer.

Why does my subwoofer generate a feeble and distorted sound?

1. excessive authority

This can occur when the subwoofer is played too loudly or too softly. It is not intended that the highest rating of power be enforced for an extended period of time. Even if you bought the subwoofer because it was advertised as being able to withstand extended durations of high volume. It is intended to be played intermittently, not continuously.

The voice coils’ overwhelming tears separate them from the spider. This produces little or no sound.

You might potentially harm the subwoofer by underpowering the speakers. This causes the voice coils to jam due to overheating. And at that point, you realize your subwoofer is busted.

2. Signal deformation

Please do not increase the volume when there is a distorted signal, as this might easily destroy the subwoofer. Typically, it is made worse by the fact that you may not be able to hear the garbled signal until you have turned it up to a damaging level.

It is vital to evaluate the subwoofer in order to ascertain the extent of the damage. When a subwoofer blows, various forms of damage might occur. You can learn to do the tests without further damaging the defective subwoofer.

How to determine whether a subwoofer has failed

1. Hear the sounds.

The sound you hear will directly correspond to the amount of damage done. Play some audio at a low volume, and then gradually increase both the loudness and the bass. Keep an ear out for any audio quality issues. Check for the presence of crackles, pops, and general static. Different sounds have distinct meanings. If there is no sound at all, the subwoofer may be entirely blown. If your subwoofer is getting the audio signal via a cable, check before assuming anything is wrong.

Partial sound with distortion – if you hear a faint and distorted sound at any volume, then you have a subwoofer that has partially failed.

2. Examine the speaker’s cone

As the speaker cone is supported by a suspension system, it should be flexible and easily torn. Checking the speaker cone is the simplest test because it only involves your hands, however it does take concentration. First, remove the cover to gain access to the cone. Then, slowly move the cone with both hands while avoiding the application of force.

This may be the result of a broken or jammed voice coil. It indicates that it is blown.

Unstable/shaky cone – if the cone rolls around unsteadily, the suspension system may interfere.

Rough/scratchy sounds indicate that the cone has already been damaged and should be replaced.

3. Test the voice coil of the subwoofer

Typically, a voice coil is linked to the cone of a subwoofer and has both negative and positive terminals. It enhances the current running through the speakers. This test requires the use of a multimeter, which measures electrical resistance. How to use a multimeter to examine a voice coil

Disconnect the subwoofer from the power.

Unplug the input audio cables.

Take the sub out of its container.

Connect both evidences to the multimeter.

Engage the multimeter to measure ohms.

Insert the black probe into the negative lead and the red probe into the positive lead.

The multimeter should now be capable of measuring the resistance. Round the resistance to the next whole number for accuracy.

The results should be viewed as follows:

  • No resistance/infinite resistance – damaged voice coils.
  • Shifting readings – voice coil is completely broken.
  • A reading greater than one ohm indicates a working voice coil..

After determining that your subwoofer has failed, the first step is to disconnect it from your vehicle. The duration of your stay accelerates the deterioration of the audio equipment. Next, you can verify the validity of your warranty and request a replacement, or the manufacturer can repair the product. Perform this prior to opening. Then, a technician can be contacted.

How to repair a damaged subwoofer

If the blown subwoofer is an older model, you may decide to purchase a replacement after testing. If you do not wish to purchase a new one, you can repair the old one. The procedure of fixing a blown-up subwoofer is by trying to correct numerous faults like;

1. Subwoofer cone and coil

  • Remove the speaker.
  • Cut out the spider.
  • Remove the voice coil and the gasket and clean any debris.
  • Remove solder and wires.
  • Line up the new coil with the terminals.
  • Glue the spider to its original location.
  • Where the gasket was placed glue.
  • The speaker cone is supposed to be set in a correct location
  • The lead-out wires must be affixed to the cone.
  • Solder and thread the lead wires.
  • Reattach the dust and cone cover.
  • Solder the lead wires to the terminals of the basket.
  • After replacing a driver, you must conduct a test.

2. Foam encasement

  • Disconnect the gasket from the frame.
  • Remove the damaged component from the subwoofer.
  • Remove any residue with alcohol.
  • Connect the new foam perimeter.
  • Allow the adhesive time to dry before installing the new foam ring.
  • Install the gasket again.

3. Tear

  • Obtain a paper towel and adhesive for the speaker dust cap.
  • Cover the hole in the paper towel with glue.
  • To avoid a dirty job, the paper towel should be smooth and seamless.

4. Stuck voice coil

  • Search for a flashlight or other cylindrical object.
  • Push the coil back into position.
  • Verify that it works.


Before concluding that a subwoofer is blown, you should first test it and then determine which component is damaged. You can then choose to make a rapid repair with easily available components, to call a technician, or to purchase everything at once. Obviously, it would be cheapest to fix it following the steps and techniques outlined above.

By choosing the greatest subwoofer on the market, you may alleviate a great deal of stress and enjoy fantastic music in your car for a longer period of time. Below are our top three subwoofer products that I strongly endorse.