Repair Your Speaker with Black CA Glue – A Step by Step Guide

Speaker repair is inevitable. Even with the new and improved technologies in audio enhancement, there will always come a time when the foam material that holds the cone of the speaker to the basket is going to get worn out and eventually crumble. This is what brings about the annoying and screeching sounds from the speaker. When most people are faced with such a situation, they just throw them away or buy a new set of speakers. What they don’t know is that their speaker could be easily restored to its former brand new-like condition from the very comfort of your home.

For you to tell if the foam of your speaker is deteriorating, you will have to take the grill off from the speaker and look for cracks or tears in the foam. If the condition is far much worse, you are going to see holes where the material has deteriorated away. Do not worry, it can still be repaired.

This article is going to take you through a step by step guide of how you can easily repair your speaker with cyanoacrylate or CA glue when the foam starts to get worn out.

Materials Needed

super glue

  • Starbond KBL-500 Impact Resistant Black Medium CA Glue
  • Screwdriver (Phillips preferably)
  • Flat head screwdriver
  • Acetone
  • Pair of rubber gloves
  • Small towel
  • Putty knife
  • New speaker foam
  • Painter’s masking tape
  • Waxed paper backing
  • Step 1 - Removing the Speaker from the Cabinet

    Use the screwdriver to carefully remove the screws holding the speaker in place. The Phillips screwdriver works with most speakers but some will require a flat head screwdriver. The speaker is usually tightly fitted, so this will require some effort.

    When you are finally done with removing the screws, mark the wires and where they connect before dismantling them. Remove the speaker and carefully place it on your work table.

    Step 2 - Removing the Old Foam

    This is a messy stage, so you will need to put on your pair of rubber gloves.

    Wet the small towel with acetone and use it to rub the foam residue from the speaker cone. You should be careful not to use a lot of pressure as it might tear it apart.

    In most speakers, there is usually a plastic or cardboard ring around the rim of the basket just over the foam edge, use the screwdriver to gently pull it out.

    Once it is out, pour a few drops of acetone around the foam edge residue and let it soak for a couple of seconds before scraping it away with your putty knife until all the foam residue is removed.

    Remember, you don’t need to get every last bit of the foam residue. The new foam has thickness to it and bits of residue that are no larger than a grain of sand will not pose a problem.

    Step 3 - Cover the Voice Coil

    The cover of the voice coil needs to be something that is perfectly of uniform thickness but very thin. Its surface must be slick so that it can be positioned perfectly between the magnet and the voice coil. I would recommend waxed paper backing (shim). Have two pieces of the paper that are each about two inches wide and long enough to wrap around the magnet. Use the first strip of paper and wrap it around between the magnet and the voice coil and the second strip between the magnet and the first strip so that the voice coil is absolutely surrounded.

    The voice is covered to prevent the glue from sticking to it when the foam is put back.

    Step 4 - Laying the CA Glue around the Perimeter of the Speaker Cone

    The speaker glue, black medium ca glue, is a specially formulated rubber toughened CA glue that dries jet black in color. Do not skimp on the glue, buy two bottles if necessary. You need the new foam to stick firmly.

    Step 5 - Securing the Foam to the Speaker Cone

    After you have put the glue around the perimeter of the speaker cone, you should then proceed to drop the new foam carefully into place. Make sure you have it perfectly in a uniform circle. Once you have centered it perfectly, tap lightly all the way around the perimeter in order to get the glue to soak into the foam.

    Now, cut around 12-20 two-inch strips of the painters masking tape. Apply the first piece of tape gently to overlap the inner edge of the foam. Follow up by making a crease in the tape along the inner edge of the foam. You should then proceed and press the tape down to the speaker cone. Finally, work your way around the cone, overlap each piece of masking tape with the previous one making sure the tape creases along the edge of the foam, making a nice tight bond.

    Note that the number of strips of tape will depend on the size of your speaker, the larger the speaker the more strips of tape you will need.

    Wait for several hours (about 3-4 hours).

    Step 6 - Removing the Tape

    Do not attempt to yank off the tape, carefully remove them by peeling them off from the outer corners. The tapes should come off without disturbing the glue or the foam.

    Step 7 - Replacing the Outer Ring

    Lay a bead of the speaker glue around the inner edge of the speaker basket rim. For you to do this, you will have to lift up the outer edge of the foam. After you are done, tap the foam back into place and place the outer ring down into place. Make sure that the holes line up with the screw holes in the basket.

    After this step, let the speakers dry out overnight.

    Step 8 - Removing the Shim

    Gently pull straight up on the shims to get them out. Press down on the speaker cone with your fingers lightly as you pull the shims out.

    Step 9 - Reinstall the Speaker

    Place the speaker back and hook the wires back into place. Do not forget where each of the wire goes. Proceed to then line up the screw holes and screw them back down. Make sure you tighten all of the screws.

    This process is not easy. It requires a great deal of patience and steady hands. But if you follow this guide carefully you can get the job done and save a good amount of money taking the action into your own hands.

    Article notes- To begin fixing the speaker you must first unscrew the speaker and mark the wires in order to know how to put it back.