Picture of How to Repair a Cracked Speaker Cone.
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I got inspired to make this indestructible a couple of days ago when I stumbled across a set of really nice set of audiobahn subwoofers at a yard sale. The only problem was that the speaker cones were badly cracked from the previous owner pushing to many watts through them.  I bought them, took them home, and discovered a cool trick to fixing the cracks which you are about to learn about.

Don't blame me if you break your broken speaker cones lol.
This wont properly work on metal or plastic cones.
This fix will likely not make your speakers sound better than they did before they cracked. It should however sound better than they did when they were cracked.
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Step 1: Required Tools

Picture of Required Tools
Here is what you will need to fix your speaker.
Elmer's glue, gorilla glue (this stuff also works great for fixing cracks in speaker dust covers), or another type of semi flexible wood glue
A regular coffee filter.
A paint brush. I recommend a semi stiff bristled brush as it helps to rub the glue into the speaker cone
A plate
and last but not least a broken speaker...Duh

Step 2: Mixing the glue.

Your first step is to water down the glue so it will properly soak into the speaker cone.  Mix the glue with one part water to three parts glue. I wouldn't recommend adding any more water as it could cause the glue not to stick or make the speaker cone all soggy.
GillyJames2 months ago

Thank you so much for this. One of our Mission speakers started buzzing and vibrating, especially on bass lines. It ruined all our music and my husband was looking at getting new speakers. Didn't really want to do that. Then he discovered that the speaker cone was loose half way round the edge. He looked online for help and found your instructable ( I did say to him where else would you get that kind of help :-) ). He used your white glue method and the speaker is good as new. Thank you - we are really happy to have our music back with no buzzing and vibrating!

kwfinley1 year ago

Paint can be brittle. Try a water based stain instead. Sinks right in.

xrobevansx3 years ago
Don't Elmers (AKA "school glue" or "white" glue) and Gorilla glue get pretty brittle when they dry? You think a more flexible when dry glue may be better suited for all the vibration it will encounter?
coolpizzadude (author)  xrobevansx3 years ago
Well elmers seems to work pretty well, I wouldn't recommend something like epoxy because that will crack. I also wouldn't recommend something super flexible like silicone sealant as it will damage the sound quality. Basically any semi flexible wood glue works well.
Ah...I see. Good! Just wondering.
hi & geat instructable - thanks !

Just foor for thought, but have you tried Plasti-Dip for the outside rubber cracked part of the speaker ???

i have two 8-inch tornado's and they both have had extensive repair work done with clear plastidip (can also be thinned)
there is copydex or other latex glues
whulbert3 years ago
hi i have a 12 in subwoofer with a crack less then 1 inch can any one help
rimar20003 years ago
Good work!

At step 3 photo 5 you say "There is no fix for this kind of crack...": I fixed a badly broken speaker's rubber suspension, using silicone sealant and an old light fabric strip. It does not look pretty, but it is operational.

coolpizzadude (author)  rimar20003 years ago
Cool! I figured that someone would probably call me on that :). I've tried it myself too. Yes it works but I don't think they sound the same when your done. Maybe I just did it wrong, I don't know.
Thanks for you support :)
Obviously, the solution is to change the cone, done by somebody that knows the trade. My work was over a relatively cheap speaker, without ambitions.