Subwoofer Spider Sagging? Do this to fix it

If you are a beginner, learning about subwoofer parts, you must be wondering what spider refers to?

To make it clear, the spider is part of a subwoofer and does not have any relevance to the presence of any insect wandering inside your sound system.

The online world rarely discusses this particular component (spider) in a subwoofer.

Let’s move forward and put some light on understanding subwoofer spiders. Additionally, you will learn what Spider sag is all about and how to fix it at home.

What is a spider in a subwoofer?

Spiders are one of the moving components in a subwoofer and speaker that is usually placed behind the cone.

It helps to maintain the linear movement of the voice coil axially during function and keeps it centered in the magnetic gap.

These lightweight components usually contribute to the overall functions of the Subwoofer’s suspension system that is responsible for producing sound.

What is a Subwoofer Spider made of?

Subwoofer spiders are made using flexible materials such as rubber, cloth such as cotton or poly-cotton blend, conex, etc., to support their movement or vibration during function.

These flexible corrugated woven materials are also coated with metal and other elements to increase their strength and rigidity.

A stiff material will produce a stiffer spider which will impact its movement and can cause distortion in sound.

Why is it called a spider in Subwoofer?

Going a little back in the history of making spiders for subwoofers and speakers, it was the design that made it resemble a spider.

The older designs are round-like disks with ridges that look like legs and if looked at from top to bottom the appearance looks like a spider.

This is where the term Spider came from and is actually called a ‘spider suspension’ in subwoofers and speakers.

Where is the spider placed in a subwoofer?

The spider is typically placed between the frame and the cone of a subwoofer and speaker.

It is fixed to the perimeter of the subwoofer’s frame and attaches to the cone or the surround on the other end.

What does the spider do in a subwoofer?

The Spider primarily keeps the cone attached to the frame and supports its movement to produce sound. It also ensures that the voice coil moves in a linear position and is dragged back to its place after the sound stops.

Furthermore, it prevents the cone from shifting left to right during linear movement which simply adds some damping to the suspension system.

What is a spider sagging in a subwoofer?

‘Spider sag or spider sagging’ simply refers to the unusual behavior of the spider inside the subwoofer.

It can be that the woven material of the spider has stretched out or worn out which is affecting the quality of sound.

It is always best to inspect and find the possible causes to fix them accordingly.

This is because the issue may also be that the surround or the cone has stretched off their edges causing the issue.

How to fix the spider sagging in a subwoofer?

Spider-sagging issues can be irritating while you are in the mood to listen to your favorite audio files.

A worn-out spider can create distortion in the sound or the music.

Repairing the spider sag is usually an easy task, however, it also depends on the complexity of your sound box.

Let us look into the standard way of inspecting and fixing spider sagging issues in a subwoofer and speaker.

Step 1: Remove the subwoofer frame from the box

To fix the sagging issues you will need to remove the subwoofer bracket or the frame from its mounting box.

Then, you will need a pair of screwdrivers to unscrew and unmount the frame.

Note: The frame is a bracket assembly that holds the subwoofer parts together.

Step 2: Locate the spider

Once the subwoofer frame is out you will be able to see the spider situated below the cone through the frame gaps 

It holds the cone from the central gap or its central hole.

Step 3: Determine the cause

Using a wooden or plastic spatula you can inspect whether the edges of the cone or the spider have come off or not.

  • Gently press or move the spatula between the edges of the spider and its assembly on either end.
  • In most cases, it may happen that the glue has ripped off from between the spider and its assembling edges.
  • If that was the case then simply move to the next step.

Note: If you find that the spider is worn out then simply get it replaced by a professional. This is because it will require disassembling several components to replace the spider.

Step 4: Clean the surface

If you find that the edges have left the glue from the surface, make sure to clean the remains of the adhesive.

  • Using a sharp knife start scratching it the glue remains carefully.
  • Avoid damaging the spider edges or the cone materials.
  • Finally, using a soft cloth, wipe the surface that was worked on.

Step 5: Prepare the repairing stuff

You can use epoxy glue to stick the edges of the spider to its assembly.

Similarly, you can use adhesives suitable for cones, spiders, and surround.

Note: A wooden spatula would be absolutely fine to be used for the application.

Step 6: Glue the ripped edges

  • Pour or add some adhesive to a bowl and using the wooden spatula start applying the glue.
  • First, apply the glue over the frame or the assembly of the spider’s outer edges.
  • Make sure to apply a thorough application and leave it for about a minute.
  • Next, using a dry spatula press the edges of the cone over the glued surface.
  • Offer a gentle pressing over the spider’s glued edges in intervals.
  • Let it dry for some time.

Step 7: Reapply glue on the edges of the spider

Once the edges seem to be firmly stuck, reapply the glue to the edges of the spider from all around.

This will ensure a firm grip and a strong bonding between the spider edges and the frame.

Step 8: Let it dry before use

Leave the application to dry for about an hour or 2 before mounting the frame back to the cabinet.

Next, mount the frame after a couple of hours and allow some more time to settle. Maybe about 6 to 8 hours at least.

Then, play trial music to ensure that the subwoofer is functioning like before.

Final Thoughts

The Spider is a part of the subwoofer’s suspension system that plays an important role in keeping other moving parts in place.

The primary requirement of all the moving components in subwoofers is that they should be flexible and strong enough to sustain the force generated from different frequencies.

Fixing minor stretches and wear-out can be done at home using the right tools and by following proper instructions, however, major damages will need the replacement of the parts (to be done by a professional).

Armed with a Diploma in electrical engineering and a remarkable 12 years of expertise, he excels in rejuvenating music systems, washing machines, dryers, and laundry-related appliances. Manish's profound insights and practical know-how establish him as a credible authority in appliance and music system repairs. Contact: manish.singh (at) subwooferblog.com. He's always ready to lend a helping hand!