How to Test a Subwoofer? (Step-by-Step Guide)

To test a subwoofer, you can use a multimeter. You have to hook up the positive and the negative leads of the multimeter to the positive and negative terminals of the subwoofer to get an accurate reading. The values will help you to determine whether the subwoofer is working properly.

If you are still confused, then let’s get to the step-by-step process to help you test a subwoofer using a multimeter.

What is a Subwoofer?

A subwoofer is basically a type of speaker that is manufactured to produce low-frequency sound, usually around 20 Hertz. The regular or normal speakers are unable to produce accurate quality enriched low-frequency sounds so subwoofers are used.

How to Test a Subwoofer With a Multimeter?

A multimeter is a device that measures voltage, current, and resistance, which are electrical properties. So, while using a multimeter to test a subwoofer, you need to remember that the core objective is to hook the correct lead of the multimeter with the correct terminal of the subwoofer to get a perfect reading of the sub impedance.

Here are the steps you need to follow:

  • First, turn on the multimeter and set the correct settings. You have to set the multimeter to the ohm settings if you are going to test the impedance.
  • Now, locate the positive terminal of the multimeter and hook it with the positive terminal of the subwoofer.
  • The same goes with the negative lead of the multimeter, by hooking it with the negative terminal of the subwoofer.
  • Go through the multimeter display and check the reading, it will show the impedance of the subwoofer.

If you find the reading is within the normal range, then the subwoofer is working properly. But if you find it outside the normal range, then there must be something wrong or a functional issue with the subwoofer.

How to Test a Subwoofer at Home?

If you are trying to test a subwoofer at home without the use of a multimeter, then here are some DIYs that you can try.

  • Try to play some music with a strong base and notice how the subwoofer reproduces them. If you find the base sound is weak or distorted, then there is a functional error within the subwoofer.
  • You can also use a special test tone CD or you can download a test tone file from online. Usually, these testing tones are specifically designed for testing the subwoofers, so when you play the file through the subwoofer, you will notice how the sound is produced.

If you are unable to hear anything when you play a sound, or if you detect that the subwoofer is not functioning properly you can either take it to a professional audio shop to diagnose and fix the issue or you can go for a replacement.

What are the Conditions for a Bad Subwoofer?

There are signs that indicate the subwoofer is non-functional, such as producing strange noise, decreasing the volume or bass response, or noticing physically damaged units.

How Can You Identify a Blown Subwoofer? 

There are specific signs that help you to indicate that a subwoofer is blown, such as:

  • There are visible signs of damage on the subwoofer cone.
  • The subwoofer suddenly starts making noise.
  • You find the presence of holes in the surroundings.
  • The presence of a voice coil which is coming out through the magnet assembly.
  • You may find burning or melting conditions around the edges of the cone.

If you continue to use the blown subwoofer, it can lead to further damage. So, immediately stop using the subwoofer and take it to a professional for repair.

How to Troubleshoot a Problem With the Subwoofer?

If you want to troubleshoot any subwoofer problem, then make sure that all the connections are secure and check them repeatedly. Also, check whether the fuse is blown, and if it is then replace it with the new one immediately. If the problem persists, you need to contact a qualified technician to fix it.

What Type of Impedance Does a Multimeter Measure?

There are two types of impedance: AC and DC. Most of the multimeter is equipped to measure the DC impedance. So, if you are trying to measure AC impedance, then you have to get a multimeter that is capable of determining the accurate measurement. Next, all you have to do is connect the negative terminals of the speaker to the negative terminal of the multimeter and the positive terminal of the speaker to the positive terminal of the subwoofer. You will find the reading is in ohms which indicates the impedance.

Parag Banerjee
Parag Banerjee

Parag Banerjee is an experienced Search Engine Optimizer. He has a wide knowledge of Google Updates, Analytics, and many others. He studied Computer Application from Techno India.

Articles: 276