Denon Subwoofer Not Working (Causes And Fixes)

The Denon Home Subwoofer is a wireless subwoofer that can be paired with any wireless speaker to improve the low-frequency response of your audio system for movies and music at home.

However, it is possible for it to malfunction at any time, just like any other electrical appliance. In such a case, what steps would you take, and for what reason do you think that would be happening?

If your Denon subwoofer isn’t functioning correctly, the first step is to determine the cause. Investigate the power supply, the fuse, and the driver magnet to determine which component is the source of the problem.

Power failures, broken sockets and cables, blown fuses, short circuits, malfunctioning driver magnets, and failed cone seals are some of the main issues that might result in the Denon sub not functioning properly.

This article will give you detailed instructions regarding the malfunctioning of your Denon subwoofers and how to fix it.

Why Is My Denon Subwoofer Not Working?

Subwoofer’s cable connection

The reasons why your Denon subwoofer fails to function could be the following:

  • Power Failure
  • Damaged Socket
  • Damaged power cord
  • Blown Fuse
  • Subwoofer’s cable connection
  • Short Circuit
  • Damaged Driver Magnet
  • Conical Seal Failure
  • The entire Denon Sub is damaged.
  • Problems with Connectivity
  • Subwoofer On Standby
  • AV Settings Are Not Properly Configurated

1- Power Failure

First, make sure there is a power source to the subwoofer, and then make sure that the cables are hooked to the port in a secure manner. If the problem persists, the subwoofer may not be receiving power.

If there is an unforeseen power interruption, a subwoofer may stop working if you haven’t made preparations for a backup power supply.

Your Denon subwoofer will not function properly if its power supply is disrupted, as this can be caused by the failure of a power cord. If the power line wires are loose, you should check them and then attempt to tighten them.

2- Damaged Socket

Your Denon subwoofer may not be functioning properly for a number of reasons, one of which is a broken socket.

Perform a complete examination of each of the connectors. And switches that you utilized to supply electricity to your subwoofer. In the event that each of the connections is functioning as it should, the issue may lie with the socket.

Replace the plug in the subwoofer with one from a different socket, and then wait for it to restart. Enjoy the low end by turning up the volume to the maximum.

3- Damaged Power Cord

First, examine your power cord to see if it has been damaged. A faulty power cord will prevent power from reaching your Denon subwoofer, which will limit the device’s ability to function properly.

If the power cord is properly plugged in, then examine the cables to ensure that they are not loose and attempt to adjust them if necessary.

After that, reconnect the audio system and ensure that the volume is turned on before checking to see whether the problem still exists. To ensure that the subwoofer is functioning properly, play music that contains a lot of basses.

4- Blown Fuse

If the fuse in your subwoofer blows, it is possible that the device will not function properly. The following are the factors that lead to the conclusion that the fuse in your Denon subwoofer is blown:

  • When the subwoofer is played at an excessively high volume.
  • When the power level of your subwoofer is turned up.
  • The subwoofer receives power at a low voltage, which can cause some of its components to become damaged.
  • There are irregular power outages when using the subwoofer.

If, after trying all of these procedures and conducting all of these investigations, the Denon subwoofer still does not work, then the fuse has blown. When the fuse has blown, you will not hear any sound at all.

Test both the cable and the audio source before proceeding. Before drawing any conclusions, you should check that these are operating normally.

5- Short Circuit

Your subwoofer probably stopped working properly due to a short circuit. When your sub is left unused for an extended time, it increases the risk of a short circuit occurring.

It inhibits the electric stimulus, preventing current from reaching the subwoofer and making it dysfunctional. When there is a short circuit, the electromagnet does not provide the correct amount of power that is in the wires, and that power is unable to generate current in the cone of the subwoofer because it cannot drive in the cone.

6- Driver Magnet Failure

At the very bottom of the subwoofer, close to the coil, there is a permanent magnet that also functions as an electromagnet. This electromagnet receives voltage and current from the stimulus thanks to the way it is configured.

The electromagnet drives the cone, improving the sound quality by collapsing this permanent magnet.

Therefore, if the permanent magnet were to fail for any reason, the electromagnetic pole would immediately stop functioning, and the instrument would no longer be able to produce any sound in the correct manner.

7- Conical Seal Failure

The conical seal, which also functions as a ventilator, must be present in a Denon subwoofer in order for the device to produce an accurate reproduction of sound.

It ensures that the air can move through the subwoofer at the appropriate frequency.

When the air moves into the cone of the speaker, it begins to move, which in turn generates a pulling and pushing motion inside of the subwoofer.

If, for some reason, the cone gets broken, then air movement inside the subwoofer will not be able to take place as it should, and if the seal gets damaged or breaks afterward, the subwoofer won’t be able to work.

8- Lack Of Power

Subwoofers require a significant amount of power to generate the robust low tones that have come to be associated with them. It is possible that you will not have sufficient power to turn on your subwoofer if your power cables or wall outlets have been broken.

9- Problems With Connectivity

Your subwoofer may not function correctly if it has cords that are malfunctioning or have been damaged. Another potential source of the problem is connections that are either too loose or too tight.

10- Subwoofer On Standby 

However, there is a possibility that subwoofers do not have these indicator lights, and the device will not function at all if the volume is not turned up high enough.

11- AV Settings Are Not Properly Configurated 

Your home theatre system will have a lot of different components linked to it. Specific configurations will prevent your subwoofer from going on if it is not set up properly and correctly configured.

These are some of the potential issues that could arise with your Denon subwoofer. In the event that you are having difficulty getting it to switch on. It’s most likely due to these factors.

Let’s get to work on fixing it right now.

How To Troubleshoot My Damaged Denon Subwoofer?

Before you do anything further, we strongly suggest that you power off both the Denon receiver and the speakers.

Before turning it back on, disconnect it from the power source for at least two minutes. You’ll spend less time and effort as a result if the issue can be resolved by briefly switching the power on and off.

If your subwoofer continues to be troublesome, we can now go on to more technical ways to fix the problem:

Method#1- Check Connections Between Speakers And Subwoofer

In order to connect the subwoofers, speakers, and other devices, AV receivers such as Denon rely on the use of physical connectors.

Keeping track of all of these wires may be difficult and cables due to their abundance. Even the act of cleaning or moving the speakers can be used to knock some of these off the list.

If you haven’t recently checked the connections again, do so now. It’s about time you do. It’s possible that this is the answer you’ve been seeking for.

  1. Checking the connections on your Denon receiver can be done in the following manner:
  2. Give the connections on your subwoofer one extra twist of the wrench.
  3. Check to see that the input and output wires of the subwoofer are plugged into the appropriate connectors.
  4. Conduct a quality control check on the wires and cables.
  5. Be on the lookout for clear indicators of damage, wear, and tear.
  6. Replace any wires that are broken.

Method#2- Make Sure The Power Outlet And Cables Are In Working Order

The inability of your subwoofer to produce sound could be the result of faulty power connections, wall outlets, or even power strips.

In most cases, subwoofers demand a respectable quantity of electrical power. If the power components in your system are not adequate, your subwoofer will not function at all.

  1. Checking the power installation of your Denon receiver and subwoofer can be done in the following manner:
  2. Check to be that the power cable for your subwoofer is plugged into a live outlet.
  3. Connect your subwoofer to a different working wall outlet than the one it was previously connected to.
  4. Ensure that the fuse for your subwoofers has not been blown.
  5. Examining the standby LED light on your subwoofer to check whether it is receiving power is a helpful piece of advice.

Method#3- Slowly Turn Up The Volume Subwoofers Can Come With A Standby Feature

If you aren’t using your subwoofer, this intelligent function will turn it off for you.

It is possible for it to reduce the amount of power you use and increase the longevity of your components. This time around. Your subwoofer won’t begin producing sound until it has been supplied with a signal from the receiver that is sufficiently robust.

In the event that the signal does not reach the predetermined level, your subwoofer will remain silent.

You need to boost that signal and get it to go beyond that threshold in order for your receiver to switch your subwoofer over to its active mode.

Follow these steps to get your subwoofer going:

  1. Determine whether or not your subwoofer is powered adequately.
  2. Start playing audio from your receiver, which is connected to your subwoofer, in order for the subwoofer to work.
  3. Raise the level once you’ve established that sound is emanating from other speakers.
  4. Raise the volume until you can hear the sound coming from your subwoofer, then keep it at that level.

Method#4- Configure Your Denon Receiver To Adjust Output

It’s possible that the threshold you’ve set for your subwoofer is too high.

You must lower it if this is the case so that the sound can go there and trigger the subwoofer to start working.

The steps listed below explain how to change your subwoofer’s output:

  1. On your remote, select the Options button.
  2. Make your selection using the Receiver options, then hit the Enter key.
  3. Select Subwoofer from the available options on the menu.
  4. Activate the option to output to the subwoofer.
  5. Adjust the level of the subwoofer channel such that it ranges from -12.0 dB to +12.0 dB.

Note: The default value is 0.0 dB. Bringing the output level down assures that your subwoofer will work regardless of the music or audio that is playing through your system.

Method#5- Set The Volume On The Speakers To A Low Level 

Adjusting the settings on your speakers is another potential solution to the problem of your subwoofer not functioning properly due to the fact that receivers allow for the connection of a variety of speakers. You have a wide variety of options for how to set it up.

Consider this: If your system doesn’t have a subwoofer installed, you can configure your receiver to bypass the output.

The issue started when a subwoofer was connected, and you were using the same settings as before. It will not play the subwoofer in your system.

Providing that this is the case. You will need to make some adjustments to the speaker settings in order to direct the low-frequency sounds to the subwoofer rather than the conventional speakers.

How to change the speaker settings on your Denon receiver is described below:

  1. Navigate to the settings menu on your receiver.
  2. Select the configuration of the Speakers.
  3. Turn down the volume on your speakers.
  4. To determine whether or not your subwoofer is functioning correctly, play some music or other audio.

Caution: Because of the compact speaker configuration, one of your speakers will send the low-frequency audio to your subwoofer rather than directly to itself.

When it is large, it indicates that the particular speaker will receive some bass tones.

Method#6- Adjust The Settings On Your AVR So That LFE And Main Are Selected

It’s possible that your Denon receiver’s settings, in addition to your speaker arrangement, are preventing your subwoofer from functioning properly.

The specific configuration that we are going to look at is called LFE, which stands for low-frequency effects. It is responsible for controlling the signals that are sent to your subwoofer.

It’s possible that you’ll consider it to be the same as Solution No. 5. However, it is independent of it.

The LFE + Main mode can be activated on your subwoofer by following these steps:

1. Navigate to the Settings menu on your receiver.

2. Change the mode to a subwoofer.

3. Make sure that the LFE + Main option is selected.

4. While you are checking the bass, play some music or audio that has a strong bass.

Please take note that there are certain settings that, when combined, will prevent your subwoofer from functioning. For instance, the LFE setting for Subwoofer Mode will be chosen if your speakers are set to Large.

These potential fixes will assist you in determining the cause of the problem with your Denon subwoofer not functioning properly. However. There is still the possibility that none of these solutions will succeed.

Providing that this is the case. You should think about potential hardware issues, as well as the fact that your machinery will require maintenance. Get in touch with Denon’s support staff for additional in-depth assistance.

Why Did My Denon Subwoofer Start Humming?

Denon subwoofer may experience humming

Your Denon subwoofer may experience humming, which is one of the most irritating problems that can occur.

Either an irregular current flow in the audio cable or a voltage mismatch between the sub-electrical ground and the equipment ground could be to blame for this issue. Both of these factors could also contribute to the issue.

Another common reason for buzzing speakers is when the volume or bass is turned up too high, resulting in an excessive amount of pressure being placed on the speaker.

In order to resolve the problem with the Denon subwoofer humming:

  1. Check your audio cable port.
  2. Update your audio drivers
  3. Make sure the transformer is working.
  4. Cut the grounding loop in the electrical circuit.
  5. Avoid creating frequency interference at all costs.
  6. The volume can be adjusted.

The presence of a ground loop problem causes a low-frequency hum to be produced whenever any TV or audio component, including the subwoofers, is plugged into an electrical outlet.

Variations in ground voltage, components of the system, audio/video connectors, and power cords all contribute to the hum that can be heard.

Despite the fact that some people attempt to eliminate subwoofer hum with a power conditioner, this strategy is not very successful very often. Instead, you should give the strategies described earlier a go to get rid of the subwoofer hum.

Why Is Denon Sub Not Pairing?

The technique of matching your subwoofer and sound bar is often completed at the plant where the products were manufactured.

In the event that the communication is interrupted, however, the pairing can be repeated by following a few simple steps. If the pairing does not take place successfully, there may be an issue with the electrical connection.

When your Denon subwoofer isn’t pairing, check to see if there’s a problem with the electrical connection.

To do this, start by unplugging all of the wires leading from the subwoofer to the socket. Next, unhook the power cord and the subwoofer. It is essential that the subwoofer is plugged in first, followed by the bar.

Also, tighten the ones that are only weakly linked. Also, check to see if all of the cables are attached to the appropriate locations; if any of them aren’t, reattach them to the appropriate plugs.

After you have ensured that these connections are secure, you should power on your subwoofer, push the pairing button located on the sub, and then evaluate the volume level.

If you begin at a low volume and progressively increase it, you will be able to determine whether or not the subwoofer is functioning.

How Do I Connect My Denon Subwoofer To The Sound Bar?

  • You may connect your Denon subwoofer to your soundbar by turning it on and pressing the PAIR button on the device.
  • The LED indicator will start flashing blue after a moment. Pay close attention to the back of your soundbar now and locate the button labeled “PAIR.” That brings us to an end!
  • When the pairing has been successfully completed, the color of the LED indication on the subwoofer will remain blue.

Why Does My Wireless Sub Cut Out?

Even though subwoofers are an excellent method to enhance the audio experience, it can be annoying when they suddenly stop working properly.

This may occur if there is a sudden disruption on your Denon receiver, which may shut out the sound from the Denon subwoofer. Additionally, this may occur if the subwoofer is not receiving enough power or if there is a problem with the wiring.

The lack of the subwoofer to receive a signal may be the result of difficulties such as improper wire connections, cables that have blown out, an energy-saving mode, overheating, or an inappropriate speaker size setting.

This disturbance needs to be repaired as soon as possible in order to prevent these actions from harming the system.

  • Check to see if the connections on your receiver are faulty in any way, and make sure that your gadget is plugged into a power outlet that is operational.
  • Repair the ground connection, then screw the nut as tightly as possible.
  • Check to see that the speaker cable is securely fastened to the sub box.
  • If you want to make sure that the speaker wire is properly attached to your receiver, A possible solution is to unplug it and then plug it back in.

Bottom Line

Now that you are aware of the potential causes and solutions, the subwoofer on your Denon receiver may not be functioning properly. You should take action right away and put these answers into action.

These are easy methods that don’t require any kind of specialized technological knowledge at all.

In the event that you read this and are still having issues, please do not hesitate to get in touch with Denon.

Your problem should now be fixed if you follow the troubleshooting procedures outlined above.

If you have gone through all of the procedures and the problem still hasn’t been fixed, or if the subwoofer isn’t turning on at all, your subwoofer may need to be looked at by an electrician, or it may need to be replaced with a subwoofer of a higher quality.


At the conclusion of our conversation, it is my sincere hope that this post will be of assistance to you in accumulating all of the straightforward and uncomplicated steps necessary to repair your defective Denon subwoofers at home without having to call an electrician.

By carefully analyzing the issues and carrying out the procedures outlined above, you will have no trouble solving any of the problems.

If your subwoofer does not operate at all, A specialist should be considered as soon as you can so they can further diagnose the issue or replace it.

Leave a Comment