Dent Repair - Speaker's Dust Cap





Introduction: Dent Repair - Speaker's Dust Cap

About: Hi I'm Angelo! I am a college student taking my majors in BS-ECE at the DLSU. I use my course as an inspiration for making my current projects! I've been posting projects here ever since I was 10. I also run...
Today I am going to show you how to repair a dent on a speaker's dust cap. When it comes to speakers without grills, people usually punch or push a small dent on a speaker's dust cap. The dent doesn't actually affect the speaker's performance but rather it becomes eyesore, dents make speakers look ugly. I found a fast and easy way to restore the original shape of a speaker's dust cap.

What Is A Dust Cap?

A dust cap is the semicircular dome found in a speaker's cone. From its name, the dustcap prevents the speaker's coil form collecting and storing dust from the outside.

Here's A Video:

Step 1: Tools and Materials

For this project you will only need 3 tools to fix the dent dusted cap. The tools can be found in every household. The three of them are very common and can be found everywhere.

Tools An Materials:
(click on item where to buy)

- Black Marker
- Long Nose Pliers
- 2 Thin Needles

Step 2: Making a Hooked Needle

Get your pliers and slowly bend the needle at a 45 degree angle. Be sure to bend it slowly or else the needle might break, needles break easily.

Step 3: Puncture the Dust Cap

Puncture the dust cap with the needle you just bent, then pull it in a slanting position. The hooked end should grip on the dust cap. Repeat the procedure until it goes back into its original shape.

Step 4: Using a Marker to Hide the Tiny Holes

Use a marker that matches the color of your dust cap. Shade it until you are done.

Step 5: You're Done!

Your done! You're speaker should look like the picture below.



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    This is such a great idea! I don't see why everyone hates it so much. Just cover the hole with glue, and the dust will stay out and the hole will not get larger.

    1 reply

    nice idea with the black marker!
    unrelated question: where did you get the speaker?

    1 reply

    I know that you live in the Philippines, I am a Filipino too! You can buy one in raon, or in deeco muntinlupa. It is a 50W Crown Woofer that costs P250/ pc.

    No No No No! Making holes in the speaker cone is not what you want to do. It will compromise the strength of the speaker material and one slip means you could tear it. Use a vacuum cleaner on low power to suck out the dent. If your vacuum cleaner only has one setting, try attaching a a toilet paper inner cardboard tube to the end of your vacuum hose. Then make a few holes in the card board sides to reduce the power of the suction. Other wise stick some sellotape to the cone and pull it off and out will come the dent.

    1 reply

    try to look for audiophile speakers, like bowers and wilkins, PSB. Their dust caps are in a shape of a bullet, you will notice that the bullet is not attached to the cone but in the magnet, thus leaving a c
    gap from the cone to the coil.

    Let's face it, you do not need electricity to fix the den't, unlike the vacuum.

    I am really surprised that most people don't give a rip about your method and say, "USE A VACUUM, GOSHHH." I personally think that having a bent pin like this around allows you to pretty much immediatly fix the problem.

    I thought the Instructables community would be a little more accepting, but after reading comments like,


    I'm really not sure anymore. Good 'ible besides.

    2 replies

    Oh, and one more question : If it gets dented again, is it a really bad idea to try to re-use your holes again?

    Reusing the hole is fine, that's the beauty of it, you only need to use 1 hole.

    cool man
    great job......!!!!!!!!!!!!!!!!!!!!

    I have used the needle, tape, and vacume cleaner trick to repair dustcaps professionally. When using a needle I always sealed the tiny hole with wood glue - not because the hole will enlarge, it will not - to keep dust out of the voice coil gap. That is why they put the cap on it in the first place. I prefer the needle method.

    If you need to replace the cap, replacements are available. Here is a source Google just returned: .

    that's good and inventive
    like it
    but try a vac......
    looking at the comments
    that's what was on my mind
    just suck the thing out
    no holes no repairs

    This is a superb tutorial. The pictures are very clear, the writing is easy to understand, and the end result is exactly what the reader would expect.

    As some other users have mentioned, there are other ways to repair a dent on a speaker's dust cap:
    • use a vacuum to suck the dent out
    • use your mouth suction to suck the dent out (only on large dust caps)
    • use duct tape to pull the dent out

    Some users have mentioned that the two pinholes created with this method could become bigger with extended use of the speaker. This is inaccurate because the dust cap itself doesn't move when the speaker is used; those users were probably thinking of the speaker's diaphragm itself, which would create large rips if any holes were punched in it.

    5 replies

    I usually use the vacuum method If can't pull them back anymore I use the pin method. You wouldn't see people use the pin method often, I only thought of it because, sometimes the vacuum method won't work anymore.

    I have also used a dab of hot glue, pulled a "string" off while it was still warm, and then, once it cooled down, pulled it up, then once the cap was round again, pulled it off.

    The problem with hot glue is that when it cools down specially in polypropylene cones, the Hot glue becomes hard to remove

    The dust cap DOES move with the rest of the diaphragm, but I agree that it's not likely to worsen over time. The bigger issue is that dust caps are either porous or completely solid and is part of a conscious design decision by the manufacturer. If the dust cap wasn't breathable BEFORE, it shouldn't be after, either. If the driver has a solid dust cap, I would recommend sealing the hole with a small dab of glue. Something like Aileen's Tacky Glue would be perfect.

    I would also try the vacuum method first.

    i had this problem today with a tweeter and a light went on in my head.i got a piece of pipe bigger then the cover and sucked and it popped out not make holes in them.