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Yamaha S4115h blown woofer

Foxadn

Foxadn

New Member
Hi everyone,

I recently bought a pair of these for dirt cheap. One is working and the other has a broken woofer (torn paper, voice coil probably open).

I see 2 options to fix the bad one:
- buy a recone kit from the Speaker Exchange
- or remove the good one, measure its T/S then find another driver close enough (I use them for garage PA so nothing Hi-Fi)

BUT... my biggest problem is: I opened the bad one, remove the 6 screws from the inner woofer baffle... and it will absolutely not move. I went pretty hard at it, nothing. This thing is built like a tank!

Without removing this baffle no access to the woofer screws...

Has anyone ever did the same operation successfully? Is breaking the glue (or baffle) the only option here?

I would think a PA speaker should be designed for serviceability... maybe it got already repaired by someone previously who got zealous and glued the hell out of it...
 

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Welcome to AK!

You say it's voice coil is "probably open". Have you tested it with a multi-meter to make sure? If it just has a torn cone you can easily repair it.

As for removing it...

It looks like it's mounted on a thin piece of particle board. If you have to break it to get the woofer out it would be no huge loss. Just find a decent looking piece of scrap wood and cut it to size.
 
Thank you, Crazy!

Funny I didn't even take the multimeter out when I had the speaker open, but when I played it nothing at all moved on the woofer. That's why I'm suspecting an open VC. But agreed there could be an issue with the crossover inductor too.

I have to say I got so frustrated with the baffle that at some point I closed it back and called it a day ;)

Thanks for the suggestion on the particle board. It seemed savage to me at first to consider doing that but I think you're right, it makes sense. As long as I don't damage the boards that shape the front "horn" (not really a horn). I think the baffle is 3/4" thick, shouldn't be too hard to find.

I'll report back when I find some time to tackle that.
In the meantime if anybody else has an idea that doesn't involve a jack hammer or gasoline, feel free to chime in :)
 
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