First Ever Fusion-8 Alchemy MTM Build Thread, Piano Black Finish - Page 5 - AVS Forum
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Old 04-30-2014, 06:49 AM - Thread Starter
 
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Originally Posted by UA_Iron View Post

Some other thoughts:

1. Glue/adhesive and chemical compatibility of it and the paints - it's possible that it could lead to a witness mark like that.

2. It has something to do with the expansion and contraction of MDF - the two panels could be expanding/contracting opposite each other and causing a sheering motion, or some kind of moment is created where the panels pull apart from each other.
http://www.koetterwoodworking.com/controlling-wood-movement-part-ii-mdf-and-new-product-announcement-2/

I'm betting it has to do with humidity conditions more than anything else. If the outside of the box is properly treated sealing out any moisture, you might look to coating/treating the inside of the box to create the same moisture barrier.

Yeah I think you're right about treating the inside. Is it a common thing to treat the inside I don't think I've ever seen a build thread where someone did it?
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Old 04-30-2014, 07:44 AM
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Originally Posted by JWagstaff View Post

Yeah I think you're right about treating the inside. Is it a common thing to treat the inside I don't think I've ever seen a build thread where someone did it?

It was a thought - it doesn't look like its super common but it is definitely a topic that has been mentioned on other forums.

Expansion/contraction is hurting the finish, sealing the inside might help mitigate that but not fully solve the problem. It's something at the interface that's probably causing it.
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Old 05-08-2014, 10:55 AM - Thread Starter
 
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Ok I grabbed some bondo today to try on my next build - I hope I bought the right one. There was just "body filler" in medium to large size cans, with 2 separate materials you have to mix, and then they had a tube of bondo spot putty which was just one paste and no mixing required. I bought the body filler as it seems stronger and better value, was that the right choice?
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Old 05-08-2014, 12:29 PM
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Yes

Easy to use. Hardens great and sands great. Just follow the instructions it should work great.

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"Too much is almost enough. Anything in life worth doing is worth overdoing. Moderation is for cowards."
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Old 05-08-2014, 02:27 PM
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It looks like in your build pictures that you dont have inner braces?

That could be another element to this puzzle. The speaker is like a pressure vessel at high SPLs, the wood will want to expand everywhere outward. Inner bracing would keep the entire thing more rigid.

Just some more thoughts lol...
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Old 05-08-2014, 02:56 PM - Thread Starter
 
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Quote:
Originally Posted by UA_Iron View Post

It looks like in your build pictures that you dont have inner braces?

That could be another element to this puzzle. The speaker is like a pressure vessel at high SPLs, the wood will want to expand everywhere outward. Inner bracing would keep the entire thing more rigid.

Just some more thoughts lol...

Correct.. I didn't think they were needed on something this small. It's ported though so would it have that much pressure inside?
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Old 05-08-2014, 04:10 PM
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Yes you need braces. I put one on either side of waveguide.
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Old 05-08-2014, 06:42 PM - Thread Starter
 
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Yes you need braces. I put one on either side of waveguide.

should i take the drivers out and add some in?
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Old 05-08-2014, 06:44 PM
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Quote:
Originally Posted by JWagstaff View Post

Quote:
Originally Posted by chalugadp View Post

Yes you need braces. I put one on either side of waveguide.

should i take the drivers out and add some in?

Yes. I have mine crossed over at 90hz and if you play it loud put your hand on the box. Those woofers are moving, not like a sub, but will reasonate.
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Old 05-08-2014, 07:09 PM - Thread Starter
 
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yea makes sense, I'm actually not sure why I didn't brace it now that I think about it
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Old 09-23-2014, 03:15 PM
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You didn't use any braces ?
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Old 10-19-2014, 09:54 AM
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Nice Job

Nice work but what I'm curious about is how do they sound and do you have any testing specs on them yet?
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