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The making of: The Two Towers (a 25 driver Full Range line array)
The making of: The Two Towers (a 25 driver Full Range line array)
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Old 13th November 2013, 11:04 AM   #111
evanc is offline evanc  United States
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The making of: The Two Towers (a 25 driver Full Range line array)
Oh sh!t...After the amount of work that's gone into these this must be heartbreaking.

There are metal rods running vertically. When the wood wanted to shrink even a tiny amount per layer the metal wouldn't let the tower get shorter.

If it were me I would fill the crack with colored epoxy and keep going.
Evan

I just saw your edit...I've said nothing you didn't know.
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Old 13th November 2013, 11:09 AM   #112
Scottmoose is offline Scottmoose  United Kingdom
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Sorry to see this. Seconded re filling the crack, assuming it's not totally snapped the enclosure.

I'm afraid translam construction is notorious for this sort of thing happening; either delamination on glue-lines, or cracks through supporting inserts etc.
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Old 13th November 2013, 11:11 AM   #113
wesayso is offline wesayso  Netherlands
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It was a sudden change in weather over here, from a damp rainy day to clear conditions (frost outside). I observed my wooden floor and noticed the change over the past couple of days, you can see the seems in the floor opening up (oak floor, glued but it still moves) after more than a week of being very even and closed up.
I had been eyeing my enclosures to observe but didn't expect (or hope) this to happen.
It was the ultimate test I guess.
Now I regret not packing them in fiberglass matt and epoxy as I originally planned. Don't know if that would have helped though. The diffenece in expansion from the wood and the threaded rods might still have been an issue.

I'll attempt to rescue the broken enclosure. No way of knowing it will work.
A sad day after half a year of work .
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Old 13th November 2013, 11:15 AM   #114
wesayso is offline wesayso  Netherlands
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Quote:
Originally Posted by Scottmoose View Post
Sorry to see this. Seconded re filling the crack, assuming it's not totally snapped the enclosure.

I'm afraid translam construction is notorious for this sort of thing happening; either delamination on glue-lines, or cracks through supporting inserts etc.
The crack is all around, but not at a seam I glued... it's the multiplex part that cracked over 2 different seams.
A re-run of the pictures for the new page:
Click the image to open in full size.
Click the image to open in full size.

I found out sitting behind my desk, turning around towards the towers and suddenly realizing a streak of light coming trough. I wasn't even shocked. As this had been on my mind. You don't want to know how long I was in doubt to use wooden dowels or threaded rods. Not to say it couldn't have happened if I had used dowels.

Last edited by wesayso; 13th November 2013 at 11:20 AM.
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Old 13th November 2013, 11:24 AM   #115
Xerxes75 is offline Xerxes75  Netherlands
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Oh my .... This is a awfull. So sorry to see your excellent build like this. I hope that there is still a way to fix them.
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Old 13th November 2013, 11:25 AM   #116
KLBIrd is offline KLBIrd  United States
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The making of: The Two Towers (a 25 driver Full Range line array)
Unfortunately there are always risks in building exotic systems.
I am truly sorry for you situation. You may be able to salvage them using some type of filler and then refinish the affected area.
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Old 13th November 2013, 11:35 AM   #117
wesayso is offline wesayso  Netherlands
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Quote:
Originally Posted by evanc View Post
Oh sh!t...After the amount of work that's gone into these this must be heartbreaking.
There is a very similar crack in my heart right now .

One more picture inside the chamber, you can see it wasn't a glue line between my layers:
Click the image to open in full size.

If I can't fix the crack another way I'll probably wrap the entire speaker with cloth and epoxy. I do hope not to have to do that though.

Last edited by wesayso; 13th November 2013 at 11:44 AM.
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Old 13th November 2013, 12:17 PM   #118
Rullknufs is offline Rullknufs  Sweden
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The making of: The Two Towers (a 25 driver Full Range line array)
Well, the enclosures aren't useless. You might just have to go with another finish. They may still sound really good though.
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Old 13th November 2013, 12:34 PM   #119
thoglette is offline thoglette  Australia
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The making of: The Two Towers (a 25 driver Full Range line array)
Default Mon dieu! Merde! Ce n'est pas bien!

Quote:
Originally Posted by wesayso View Post
...I'll probably wrap the entire speaker with cloth and epoxy. I do hope not to have to do that though.
Before you rush in, do ensure that you understand what caused the crack.

I am suprised as the rods are compressing the stack, not stretching it.

I'm confused how this happened - as it has delaminated the plywood there must have been substantial forces at work.
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Old 13th November 2013, 12:41 PM   #120
Overkill Audio is offline Overkill Audio  United Kingdom
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Default So sorry to see this...

Really feel for you here....

Just one thought before I offer some ideas.
You already have a fabulous pair of speakers that will still sound and look amazing....I bet 99.9% of the speaker guys on here would love to own your speakers as they are right now.
You still have so much good stuff here!

Damage limitation:
(1) Can you loosen the bolts or even remove the rods? This might avoid further damage.
(2) Is it possible to have each speaker as a two piece...A la Triangle Magellan I think?
(3) Would it be easier to clad your plywood stack in thin curved ply wood? ( See photo's)
This worked really great...We shipped from Norway to the Arizona and never had any climate related issues.
(4) Each Encore bass cabinet weighed over 135Kg and the two pack glue was stronger than the ply itself so we never needed rods even at such extreme weights.

Hope some of this helps and all the best
Derek.
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