Introduction: Dent Repair - Speaker's Dust Cap

Picture of Dent Repair - Speaker's Dust Cap
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

Picture of 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

Picture of 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

Picture of 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

Picture of 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!

Picture of You're Done!

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


poikilotherm (author)2012-01-01

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.

JayNL (author)poikilotherm2014-07-05

Because there are easier ways :)

It's really easy, takes about 10 seconds and you don't have to make a hole!

beehard44 (author)2012-03-05

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

ASCAS (author)beehard442012-03-06

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.

Jazzajon (author)2012-01-01

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.

ASCAS (author)Jazzajon2012-01-01

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.

ASCAS (author)2011-12-31

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

itsmanofpopsicle (author)2011-12-31

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.

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

ASCAS (author)itsmanofpopsicle2011-12-31

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

awais mughal (author)2011-12-31

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

emerson.john (author)2011-12-30

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: .

zenderon (author)2011-12-29

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

AdamVigneaux (author)2011-12-28

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.

ASCAS (author)AdamVigneaux2011-12-29

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.

schumi23 (author)AdamVigneaux2011-12-28

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.

ASCAS (author)schumi232011-12-29

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

AdamVigneaux (author)schumi232011-12-28

That's clever!

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.

mrmetallica (author)2015-09-26

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.

SGT. Desert (author)2012-09-28

Nice tanks but my stupid neighbor used a knife N has cut a hole in my gigantic speaker and its sound it dose not have any noise any more :( aghhhh . know how to fix that ?

Yonatan24 (author)SGT. Desert2015-09-25

He probably ruined the speaker... Time to buy a new one...

JCC5 (author)2015-06-20

Lets see.. the simplest way to repair that dent is to cut a pet bottle fitting the size of your speaker. Then using your mouth to sip it in.

PhillipM2 (author)2015-02-15


PhillipM2 (author)PhillipM22015-02-15

Fantastic!! it worked perfectly!!

Johnlewisdesign (author)2014-10-08

I just stick a bit of duck tape to it and quickly snatch it back off. Job done, no holes.

joaqi823 (author)2014-07-28

Yes! I can fix my dad's 30 year old speakers :D salamat

JayNL (author)2014-07-05

Damn dude, this is so much work, why not try this:

It's really easy, takes about 10 seconds and you don't have to make a hole!

iadam3 (author)2014-01-15

Tiny 1inch speaker whole cone alloy replacement

iadam3 (author)2014-01-15

Bigger one same idea and free

iadam3 (author)2014-01-15

Two small speakers. Tin can base for centre cap

iadam3 (author)2014-01-15

If you want/ need to replace the dust cap I have used the base of a tin can for many repairs just cut the concave base out with scissors and glue the dish in ether way I tend to glue them in concave so the speaker is like a dish but they work just as good both ways and are surprisingly strong and can be easily polished to make a nice looking hard to Dent dust cap for free??

ITGeekMonkeys (author)2013-09-01

That's a neat trick. I discovered my own unique solution for fixing dented dust caps while cleaning one day. I was using the vacuum cleaner tools to get at some dust and stuck the end of the hose on a dust cap that had been mocking me for years. Well, to my surprise, the 20 year old, 14" Klipsch woofer, looked as good as new!

ASCAS (author)ITGeekMonkeys2013-09-02

Yeah, I tried it too and it works ;)

timitrisanto (author)2013-01-25

thanx for your tips....

johnnyjcap (author)2012-12-05

putting a pin sized hole in a figgin dust cap don't affect diddly squat in performance or other wise. If you guys are that paranoid regarding a hole in the precious dust cap, leave the friggin dent in it. or better yet tell your little buggers not to touch the expensive equipment or you'll break their little fingers. What happens to your vacuum theory when the dust cap is made of aluminum? Bet no-one thought that one through did they. pin & marker ain't gonna fix that one. Duct tape? glue? Hmmm, leave the dent? Stop bustin on the kid, he's twice as smart as all you were at his age.

Tovamon (author)2012-09-11

i usually just use my mouth as a vacuum haha this works too

rudolphdiesel (author)2012-08-04

I lived in worst case environment, kids pets etc. I have fixed this problem and after doing it twice I built some sort of cover (skies the limit) and this issue has not come up in the past twenty years. I have better things to do with my time.

ivanjacob (author)2012-05-07

where did you get that speaker??

frozenkamote (author)2012-04-17

I just used chewed bubblegum on the end of a stick :)

solomonhorses (author)2012-02-09

nice Instructable! Excellent pictures! I will add this to my bag of tricks. One way I have done this in the past was with a small vacuum nozzle on a pretty weak vacuum cleaner. It pops it out in 1 microsecond. And if the vacuum is really strong, you will be removed of the whole dustcap problem!

OverclockersHQ (author)2011-12-29

Never puncture your dust cap that defeats the whole purpose all you need to do is grab gaffers or masking tape stick it to the dust cap and pull it off the dustcap naturally goes back to its original position on its own.

sujaydp (author)OverclockersHQ2012-01-30

Me too Agree with you, but that can be fixed.. Use a small drop / film of synthetic rubber based adhesive (used as an adhesive for soles of shoes and slippers.. in fact it is used for fixing of spiders inside the speaker for its acoustic properties..) now you can do the touch up with the marker to conceal if required (most of the times the glue is transparent/ translucent.

sabr686 (author)OverclockersHQ2011-12-29

I am in total agreement with you, my friend. Any direct air passage through the speaker will result in reduced performance. One should not be deliberately afflicting damage upon one's sound system so carelessly. I'm sure he meant well, trying to "fill in" the holes with a black felt pen (??). You can even attain good results with a straw, if it's not too far gone. Just carefully place it on the cap and suck in gently. But tape is definitely the easiest way to go, if you can.

iamdarkyoshi (author)sabr6862012-01-07

some dust caps are sealed, to push air in or out of the speaker to further cool its voice-coil. some are NOT sealed, and are more of an air filter. i have some speakers of both, for anyone who wants to see, i will post pix if needed.

geekyoldlman (author)2012-01-03

Shop Vac ... one step. 1 min. Done.

Crimson-Deity (author)2011-12-29

An easier way is to take the vacuum cleaner and pop it out on the lowest powersetting. Did this with some Hertz SPL's, still works fine with no visible damage

thegeeke (author)2011-12-29

The dust cap does move with the rest of the speaker, however, it doesn't move as much as the diaphragm. By poking holes in it, you are defeating the whole purpose of having the dust cap in the first place. Poking holes should be a last resort, and if you do it, you should use something that will actually fill it. Personally, I would rather have the eye sore than decreased performance.

Mr911S (author)2011-12-29

I've used a vacuum cleaner worked well. So highly recommend to do it that way.

moebuspcgold (author)2011-12-29

Use a Vacuum cleaner. Set it to lowest suction. Id the cone is small (tweeter) use a length of garden hose attached with tape to the vacuum cleaner hose.

About This Instructable




Bio: Hi I'm Angelo! I am a 18 y/o college sophomore taking my majors in BS-ECE at the DLSU. I use my course as ... More »
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