How to Unfreeze a Subwoofer- The Ultimate Solution

A subwoofer is an essential component of a sound system, especially for music or home theater enthusiasts who want to enjoy high-quality audio with deep, powerful bass. However, it can be frustrating when your subwoofer becomes frozen or has stopped working for no apparent reason.

Oftentimes, subwoofers can stop working or freeze due to various reasons, such as electrical faults, damaged components, or incorrect installation. In some cases, the issue may be a simple fix, such as a blown fuse or disconnected wire. However, in other cases, it may require professional assistance to diagnose and repair the issue.

What Causes a Subwoofer to Freeze?

If a subwoofer is used within its design parameters, receives proper ventilation, and is not overdriven, it can last for many years without any issues. On the other hand, if the subwoofer is used beyond its design limits, exposed to moisture, or placed in an area with poor ventilation, it may have a shorter lifespan and may be more prone to malfunctions or failure.

Some of the common issues that can cause a subwoofer to freeze and stop working include;

How to Unfreeze a Subwoofer

Blown fuse

A subwoofer has a fuse that protects it from power surges or overloading. If the fuse blows, the subwoofer will stop working. In addition, a blown fuse would prevent the subwoofer from receiving power, which makes it become stiff or not function at all.

Damaged voice coil

The voice coil in a subwoofer is responsible for converting electrical signals into sound waves. If the voice coil is damaged or burnt, it can cause the subwoofer to become stiff or locked in place, preventing it from moving freely and producing sound. This can also result in distorted or muffled sound quality or a complete loss of sound output.


Subwoofers can overheat if they are driven too hard or placed in an enclosed space with poor ventilation. When a subwoofer is pushed too hard and overheats, the materials in the speaker driver, such as the adhesive holding the voice coil or spider in place, can become soft or melt, causing the speaker driver to become misaligned or locked up. This can also make the subwoofer become stiff or frozen and unable to produce sound.

Faulty amplifier

If the amplifier is sending a distorted or incorrect signal to the subwoofer, it can cause the subwoofer to produce abnormal or uneven movements, leading to misalignment or locking of the speaker driver. A faulty amplifier can also send too much power or too little power to the subwoofer, causing it to overheat, become damaged, or become locked up.

Additionally, if the amplifier is not properly matched to the subwoofer’s power handling capability, it can cause damage to the subwoofer or lead to reduced sound quality. Ideally, using a faulty amplifier can cause damage to your subwoofer and lead to more costly repairs.

How to Unfreeze a Subwoofer

Inspect the wiring

If the wiring is damaged, it could cause a decrease in power to the subwoofer, which could lead to it feeling stiff. Additionally, if the wiring is not properly connected or grounded, it could cause interference or other issues that could affect the performance of the subwoofer.

As such, ensure that the wiring connections between the amplifier and subwoofer are secure and that there are no loose connections or damaged wires. This is especially important if the stiffness is sudden and rampant.

Adjust the settings on your amplifier

Check the settings on your amplifier to ensure that they are properly configured for your subwoofer. If your subwoofer is overpowered, it can cause the cone to become stiff. In addition, ensure to keep an eye on the subwoofer while it’s in use. If you notice any distortion, clipping, or other signs of overpowered signals, turn down the volume or adjust the settings on the amplifier to prevent damage.

Check for physical damage

Physical damage can cause a subwoofer to become stiff or freeze. Subwoofers are delicate and complex pieces of equipment and even minor damage can affect their performance. Visually inspect the subwoofer for any physical damage, such as cracks or tears in the cone or suspension system.

If you find any physical damage, it is best to get it repaired before the issue gets out of hand. Repairing a subwoofer is often complex and requires the subwoofer to be disassembled. As such, it is always a good idea to take it to a professional for repair.

Repair torn components

A tear on a subwoofer can cause the surrounding material to become misaligned, which can result in a change in the subwoofer’s suspension system. This, in turn, can cause the subwoofer to become stiff and unable to move freely.

The tear can also allow air to leak out of the subwoofer’s enclosure, which can affect the subwoofer’s performance and cause it to become less responsive or less efficient. Additionally, the tear can cause the subwoofer to produce distorted or muffled sound due to the misalignment of the surrounding material.

Any damage to a subwoofer’s components can affect its performance, and as such, tears should be repaired as soon as possible to prevent further damage. If the tear is too large, it may be necessary to replace the subwoofer or the affected component to restore its function.

Consider re-conning the subwoofer

Re-conning involves replacing the speaker cone and other components of the subwoofer that may have been damaged or worn out. If the subwoofer is frozen due to damage to these components, re-conning might help to restore its functionality.

However, if the subwoofer is frozen due to a different issue, such as a problem with the amplifier or a wiring issue, reconning will not solve the problem. In this case, it is important to identify and address the root cause of the problem before attempting to re-cone your subwoofer.

Replace the foam surround

Replacing the foam surround of a subwoofer may also help to fix a frozen subwoofer to some extent. The foam surround is the flexible ring that connects the speaker cone to the frame of the subwoofer. Over time, the foam surround can dry out, become brittle, and crack, causing the subwoofer to freeze or stop working altogether. If the subwoofer is frozen due to a damaged or deteriorated foam surround, the best thing you can do is to replace it.

Frequently Asked Questions

How do I tell if a car subwoofer is blown?

The most common causes of a blown subwoofer are over-powering, under-powering, or playing music at high volumes for an extended period. Over-powering can cause the voice coil to overheat and burn out, while under-powering can cause the subwoofer to operate at a higher temperature than it’s designed for, leading to damage.

To determine if a car subwoofer is blown, you can look for some common signs, such as distorted or muffled sound, no sound output, or unusual vibrations. Additionally, if you notice a burning smell coming from the subwoofer or see visible damage, such as a torn or damaged cone, these are also indicators that the subwoofer may be blown.

Can you Repair a Seized Subwoofer?

It is possible to repair a seized subwoofer, but the specific method on how to fix a seized subwoofer depends on the cause and extent of the damage. A seized subwoofer can be caused by several factors, including a damaged voice coil, a misaligned cone, or a faulty suspension system.

To repair a seized subwoofer, you will need to disassemble it and inspect internal components for any sign of damage. If the voice coil or spider is damaged, it may need to be replaced. In some cases, it may be possible to repair the damaged components by re-gluing them or repositioning them.

Parting Shot!

A frozen or seized subwoofer can cause distortion or reduce the overall sound quality of the system. Additionally, if the stiffness is due to physical damage, such as a cracked or warped cone, then it could lead to more serious problems over time.

If you are experiencing stiffness with your subwoofer, it is important to consult with a professional to determine the cause and the best course of action. In some cases, however, it may be more cost-effective to replace the subwoofer rather than attempt to repair it, especially if it is an older or lower-end model.

Avatar for Jamie K. Martin

Jamie K. Martin holds a degree in Audio engineering from Husson University, Bangor. Martin spends most of his time testing and trying the technology he writes about to ensure that he provides first-hand information to our customers from all walks of life.

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