Denon Subwoofer Not Working – How to Troubleshoot?

Disclaimer: “As an Amazon Associate, I earn from qualifying purchases. Without Any Extra Cost to You!”

Denon subwoofers come in various types and are usually designed to produce low-frequency sounds when playing music. When the subwoofer fails to function, first understand how to solve the problem before visiting an electrician. Most important, follow the manufacturer’s instructions and precautions to avoid damaging your Denon subwoofer further.

Denon subwoofers may fail to function for various reasons, such as blown Denon subwoofers. You can fix your Denon subwoofer by following the recommended steps but before troubleshooting the subwoofer, figure out the causes of your subwoofer not functioning at all. See how long the problems can take when fixing them.

Table of Contents

Reasons why the Denon subwoofer is not working and how to troubleshoot them

Once your subwoofer fails to function, follow the following steps carefully and try fixing the problems.

1. Power outages

Once your Denon subwoofer fails to function as required, first check if there is any power supply to the subwoofer. Power shortages can result in a subwoofer not functioning unless you have a power supply backup plan.

Try connecting your Denon subwoofer into the power supply source, and once it fails to function, scrutinize your Denon subwoofer to identify any problem that may result in your subwoofer not functioning.

Hook up a Subwoofer

2. Damaged power sockets

Check the socket you have connected to your Denon subwoofer carefully if it is in good condition. Once you find any damages, try fixing the socket and connect your subwoofer to see if it functions. Ensure you turn on the socket.

If the speaker fails to function, try changing the socket and plug your subwoofer power cable into another socket that functions well. Try turning on your Denon subwoofer to see if it functions. After fixing your socket, but the subwoofer still fails to function, the problem does not involve the socket alone. Therefore, try examining your subwoofer for any problems.

3. Damaged power cable

First, examine your power cable and identify any damages. Power cable failure prevents the power supply to your Denon subwoofer, hindering your subwoofer from functioning. Therefore, check the power cable wires and try tightening them if they are loose. Test wires to check that they are working correctly or they need replacements.

Further, replace the wires if they are damaged before trying to test your subwoofer again. Moreover, replace your power cable if the cable is completely damaged. Test your subwoofer to see if it functions well. Ensure you connect the power cable to the socket, and don’t forget to turn on the socket.

4. Blow subwoofer fuse

Check the subwoofer fuse to see if it is in good condition or blown out. When your fuse blows out, you will require a replacement. Consult the manufacturer’s manual and identify the best fuse that suits your Denon subwoofer. Also, you can try fixing your fuse if it is fixable.

5. Connections of the subwoofer wires

Check all wires starting from the socket to the subwoofer. Identify any problems, for example, if all the wires are firmly connected. If they are loosely connected, try tightening them using the stated tool in the manufacturer’s manual.

Check the wires if they are connected and plugged into the correct spots, and if not, try reattaching the wires and install them into their correct spots. Test your subwoofer if it starts to function as required.

6. Short circuit

The most common cause of subwoofers not functioning is short-circuiting. The problem occurs when you have not used your subwoofer for a long time. The short-circuit hinders the signal produced by the wires from reaching your subwoofer, therefore, affecting your subwoofer system’s powering on.

Further, the short-circuit decreases the amount of power produced by the electromagnet, limiting the power supply to the subwoofer. The limited power supply fails to power on your subwoofer, therefore, preventing it from working.

7. Damaged driver magnet

Each Denon subwoofer has a magnet attached to the cone. If the magnet is damaged, magnetic poles connected to the electromagnet prevent the subwoofer from producing sound at all or result in the subwoofer producing less sound. Thus, your Denon subwoofer fails to function normally.

8. Cone seal failure

For the Denon subwoofers to produce the sound correctly, a cone seal is required to allow air to circulate at the correct frequency within the subwoofer. When the cone seal fails, the air inside the subwoofer fails to move correctly in all parts of the subwoofer, thus causing many collisions. Collision damages other subwoofer parts and stops them from functioning.

9. The whole Denon subwoofer was damaged

When your whole Denon subwoofer is blown out, it will automatically fail to function. Visit an electrician to help you determine the problem with your subwoofer. Once it is confirmed that the damage is beyond repair, consider replacing your Denon subwoofer.

Replace your subwoofer with a high-quality one that can last for a long time and is strong enough to at least withstand any damages.

Frequently asked questions

How can I fix my blown Denon subwoofer?

Your subwoofer maybe blows out due to the following reasons:

  1. Too much volume.
  2. Too much power in your subwoofer.
  3. Less power in your subwoofer which can tear some parts.
  4. Irregular power supply, for example, supplying more and less power to your subwoofer simultaneously.

You can fix your blown subwoofer by following the steps below.

  1. Ensure that you have the appropriate tools required, such as screwdriver glue, multimeter, etc.
  2. Check your voice coil for any damages. Check the voice coil using a multimeter, and if the voice coil resists, the voice coil is in good condition, but if no resistance on the multimeter, the subwoofer voice coil is damaged.
  3. Examine the speaker cone. Test the subwoofer speaker cone by pushing it along the sides, and If it sinks back, your subwoofer speaker cone is in good condition, but if it remains unmovable, the speaker cone needs fixation or replacement.
  4. Disengage the subwoofer speaker from its enclosure and scrutinize it for any damages.
  5. Remove the speaker surround carefully to avoid damaging frame edges.
  6. Replace all damaged parts, for instance, the speaker coil.
  7. Return speaker frame.
  8. Reinstall all the moved and replaced parts into their correct positions and test your subwoofer. If it fails to function, try visiting an electrician.


The steps involving repairing your subwoofer are simple and easy to apply instead of going direct to the electrician. Finally, ensure you follow the manufacturer’s instructions carefully to avoid damaging the whole Denon subwoofer.

Leave a Comment