Subwoofers

How to Replace a Subwoofer Fuse and Top Reasons Why They Blow Out


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Of all the problems that can pop up concerning subwoofers, you never think that you would be dealing with a blown subwoofer fuse. Some of you may not be aware that a subwoofer had fuses. However, they do, and you should know how to change it and the reasons it may have blown out.

The purpose of a fuse is to protect equipment from over-current conditions. Taking care of a blown subwoofer fuse is not very involved, but preventing a fuse from blowing in the first place is the best policy. Several things can cause a subwoofer fuse to blow.

Top Reasons Why Subwoofer Fuses Blow Out

  • Sustained maximum volume over a long period of time
  • Dead short in the subwoofer
  • Surge reaching the subwoofer possibly at system power-up or down
  • The amplifier being used could be over or under voltage
  • Component in the amp failed
  • Short in the output section of the amp
  • Short in the voice coil of the subwoofer
  • Short in the wires leading to the subwoofer
  • Defective fuse  
  • Fuse of a lesser value than recommended was installed

There are two types of fuses that could be used. One type is the slow blow fuse, which will enable the device to withstand an over-current condition over a very short period, and the second is a fast acting fuse, which would blow more quickly in an over-currant situation. So, before you install a new fuse into your subwoofer, investigate the cause of the fuse failure.

Step 1: Locate the Fuse

In order to replace the fuse, you must first locate it. Fuses for subwoofers can be located in-line with the subwoofer wires, within the speaker enclosure, and if there is an amp dedicated to the subwoofer, the fuse could be located there. In-line fuses can have different looks. One type of in-line fuse is in a tube located on the wire, or rather at a junction between one end of the wire and the other. The fuse would be contained in a spring-loaded holder. The holder could be black, white, or opaque. You would either unscrew it or pull it apart to access the fuse. Another type would be in a similar location, but it would be square with an ATM or plug-in type fuse.

Step 2: Replace the Fuse

Now that you have located the fuse, you can proceed to replace it. Ensure that the vehicle is not running and the stereo is off. Safety first. You would not want to cause damage to other equipment or to yourself. Remove the old fuse and replace it in the reverse order you removed it. Make sure the replacement fuse is the recommended amperage and type. Never use a higher amperage fuse, or the subwoofer will suffer severe and permanent damage.  

Replacing your subwoofer fuse is a simple task, after you find it. However, the best practice is to investigate the reason for the fuse failure and to make sure to replace the fuse with the correct size and type.

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