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Author Topic: Cracked jbl 2380 horn - any good fixes till replacement arrives?  (Read 2404 times)

Gary Weller

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A friend of mine had a mishap (cab fell off dolly) and discovered a crack and a small piece came out of his jbl 2380 horn near the flange where the driver mounts.

Is there a way to fix this somewhat till his replacement arrives? He's got the piece and it fits tightly. What would you suggest to "glue" it back in place for the time being?
« Last Edit: April 13, 2011, 02:32:57 pm by Gary Weller »
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Dave Neale

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Re: Cracked jbl 2380 horn - any good fixes till replacement arrives?
« Reply #1 on: April 13, 2011, 09:31:33 pm »

A friend of mine had a mishap (cab fell off dolly) and discovered a crack and a small piece came out of his jbl 2380 horn near the flange where the driver mounts.

Is there a way to fix this somewhat till his replacement arrives? He's got the piece and it fits tightly. What would you suggest to "glue" it back in place for the time being?

JB Weld.
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Matthew Knischewsky

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Re: Cracked jbl 2380 horn - any good fixes till replacement arrives?
« Reply #2 on: April 13, 2011, 11:58:16 pm »

A friend of mine had a mishap (cab fell off dolly) and discovered a crack and a small piece came out of his jbl 2380 horn near the flange where the driver mounts.

Is there a way to fix this somewhat till his replacement arrives? He's got the piece and it fits tightly. What would you suggest to "glue" it back in place for the time being?

Epoxy.
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Tim McCulloch

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Re: Cracked jbl 2380 horn - any good fixes till replacement arrives?
« Reply #3 on: April 14, 2011, 03:25:39 am »

A friend of mine had a mishap (cab fell off dolly) and discovered a crack and a small piece came out of his jbl 2380 horn near the flange where the driver mounts.

Is there a way to fix this somewhat till his replacement arrives? He's got the piece and it fits tightly. What would you suggest to "glue" it back in place for the time being?

Your adhesive repair should not introduce and seams, puddles, or flashing inside the throat or walls of the horn.  It must be smooth and follow the original contours or it will sound different (and probably sound inferior) when compared to undamaged horns.

Have fun, good luck.

Tim Mc

p.s. JBL's plastic horns are not robust.  You should find a way to support the driver independently of the horn.  Look at JBL 2509A for inspiration.  You can see it in use in the JBL Cinema Series 4670D.
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"Practicing an art, no matter how well or badly, is a way to make your soul grow, for heaven's sake. Sing in the shower. Dance to the radio. Tell stories. Write a poem to a friend, even a lousy poem. Do it as well as you possible can. You will get an enormous reward. You will have created something."  - Kurt Vonnegut

Grant Anderson

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Re: Cracked jbl 2380 horn - any good fixes till replacement arrives?
« Reply #4 on: April 19, 2011, 04:07:12 pm »

A friend of mine had a mishap (cab fell off dolly) and discovered a crack and a small piece came out of his jbl 2380 horn near the flange where the driver mounts.

Is there a way to fix this somewhat till his replacement arrives? He's got the piece and it fits tightly. What would you suggest to "glue" it back in place for the time being?

Epoxy or JB Weld may result in a mechanical bond only, which is unreliable. What you're looking for is a chemical bond. When gluing plastic, make sure to use the proper solvent-based glue for the type of plastic being glued.  When done properly, the pieces will be essentially "melted" together, and be roughly as strong as the original part.

I don't know what the JBL horns are made of (ABS is likely), but you can probably find out with a little research.  It's easy to test a particular glue by putting a small amount on a hidden part, and see if it softens the plastic. If it does, then you're on your way. By the way, Methyl Ethyl Ketone makes a fine glue for ABS plastic.  Or just buy the stuff for ABS pipe in the plumbing department of your local hardware store.

Good luck!
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Gary Weller

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Re: Cracked jbl 2380 horn - any good fixes till replacement arrives?
« Reply #5 on: April 19, 2011, 10:35:11 pm »

From the jbl pdf, it says it's made of "molded structural foam".
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Chris Gruber

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Re: Cracked jbl 2380 horn - any good fixes till replacement arrives?
« Reply #6 on: April 19, 2011, 11:21:35 pm »

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Re: Cracked jbl 2380 horn - any good fixes till replacement arrives?
« Reply #6 on: April 19, 2011, 11:21:35 pm »


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