How to Repair a Subwoofer

Written by dianne christensen-herman
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How to Repair a Subwoofer
Speaker subwoofers can be repaired yourself when there are minor problems. (car audio speakers image by Alexander Zhiltsov from

Subwoofers are outfitted with one speaker, although they come in various sizes. Low-end frequencies for amateur and professional audio systems are contained within the speaker. Since subwoofers are equipped with only one cone, this confines the number of issues the speaker can have. Finding a solution to subwoofer problems can be simpler than with some other types of speakers. Some electronic knowledge is helpful and repairs should take several minutes to complete.

Skill level:


  1. 1

    Exchange the polarity on the subwoofer speakers if it is experiencing low bass output. The speaker and subwoofer may use opposite polarities, which would cancel out frequencies and reduce the bass sound. Find the "Reverse" button on the back of the speaker case. Press the button to switch the subwoofer's polarity. The two speakers should now have the same polarity and the bass sound should increase.

  2. 2

    Inspect the equalisation of the input source. The input signal may have little bass in it and may not be putting out a strong bass frequency. Study the sound mixer or audio receiver connected to the subwoofer. Twist the dial up on the "Bass" knobs on the mixer channels equipped with sound inputs and see if your bass response increases.

  3. 3

    Locate the bass lever or knob on the back of the speaker and move it up. If this does not work, move the bass level up on the subwoofer. Look at the equalisation knobs on the back of the subwoofer speaker. Turn the "Level" knob further to the right and listen. Continue turning the level up until there is adequate bass presence. Twist the "Crossover Frequency" knob in either direction and note the sound as you move the knob and stop when the bass sound is acceptable.

  1. 1

    Examine the input signal indicator on the backside of the subwoofer. There should be blinking lights if the subwoofer is receiving the proper audio signal. If you do not see blinking lights, there may be a problem with the audio source. Turn the knob on the volume on the input source attached to the subwoofer. The issue could be the mixer, amplifier or stereo receiver. Play the sound through the subwoofer and listen.

  2. 2

    Inspect the cable connections on the backside of the subwoofer. Look for any possible dents, nicks or scratches in the input cable jacks. Remove all cables and unscrew the metal jackets. Replace any worn or damaged cables.

  3. 3

    Take off the subwoofer's back panel and look at the wiring. Any worn or damaged wiring with will prevent sound. Ready the subwoofer's user manual, since the process on opening the case can vary by model. Any loose wires should be soldered either by you or the subwoofer's manufacturer. Unless you have experience, you should leave the job to a professional.

Tips and warnings

  • Attempting any repairs yourself could dissolve any warranty regarding the subwoofer.

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