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BB Ply vs MDF vs Corian
BB Ply vs MDF vs Corian
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Old 13th October 2019, 03:36 PM   #1
bobberner is offline bobberner  United States
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BB Ply vs MDF vs Corian
Default BB Ply vs MDF vs Corian

Any disadvantage to using MDF as interior bracing for BB cabinets? Bracing is just to stiffen the cabinets, correct? Would the bracing material affect the sound of the finished speaker? I've got no plans, but am just curious.

Also, Ive seen an Austrian manufacturer using Corian for their baffles. Is there any reason for this other than just marketing and foo-foo dust?
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Old 13th October 2019, 03:54 PM   #2
mordikai is offline mordikai  United States
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It probably doesn’t matter what the bracing is. The corian is very inert and machines well. I typically use birch ply for cabinet and bracing and mdf for the baffles because it machines better than plywood. I would think the corian would be a nice upgrade to the mdf.
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Old 13th October 2019, 04:00 PM   #3
vinylkid58 is offline vinylkid58  Canada
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BB Ply vs MDF vs Corian
Quote:
Originally Posted by bobberner View Post
Any disadvantage to using MDF as interior bracing for BB cabinets? Bracing is just to stiffen the cabinets, correct? Would the bracing material affect the sound of the finished speaker? I've got no plans, but am just curious.
Other than you would need thicker mat'l to equal the same strength as BB. And then there's the fact that you can't breath in the MDF dust. You're already using BB for the cabinet, then use it for the bracing as well.

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Originally Posted by bobberner View Post
Also, Ive seen an Austrian manufacturer using Corian for their baffles. Is there any reason for this other than just marketing and foo-foo dust?
Pretty colors/textures?

jeff
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Old 13th October 2019, 10:19 PM   #4
bobberner is offline bobberner  United States
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BB Ply vs MDF vs Corian
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Originally Posted by vinylkid58 View Post


Pretty colors/textures?

jeff
It was just plain black from what I could tell. And they didn't really make any claims...
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Old Yesterday, 11:32 AM   #5
Charles Darwin is offline Charles Darwin  United Kingdom
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From what I gather making the bracing from another material than the box creates a mechanical impedance mismatch which impedes the transmission of vibrations.

Something Tannoy (DMT) and KEF came across during their research in the 80s/90s.

For price and convenience I would go for ply cabs with MDF bracing.
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Old Yesterday, 01:02 PM   #6
DPH is online now DPH  United States
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In all honesty: the greatest mechanical load (this is a laugh for anything but the most hearty of subwoofers) is the baffle then the bracing, if you've gotten it remotely close to nodes.

In all practicality, use whichever scraps you have laying around but make sure the mechanical tie is very good (dowels, mortice/tenon, sliding dovetail, rabbet)
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Old Yesterday, 01:23 PM   #7
tsmith1315 is offline tsmith1315  United States
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It will certainly affect the sound to some degree.

Plywood is definitely stiffer, MDF tends to flex. You can flex a 1"x4" strip of MDF by hand pretty easily. If your goal is to drive the resonance(s) of your cabinet up in frequency, then MDF wouldn't be as helpful as plywood. Just keep that in mind when designing your brace.

For long, skinny side-to-side braces, (like 1x2 style) don't waste your time with MDF.
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Old Yesterday, 01:58 PM   #8
puppet is offline puppet  United States
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Let's see, ground paper used for internal bracing. If you're interested in a quality build, choose lumber for braces. You will no doubt have a lot of effort into the boxes. Saving a couple bucks now might come back on you later.
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Old Today, 05:57 AM   #9
DPH is online now DPH  United States
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So you've done the structural analysis to make those kinds of sweeping absolute statements? Would love to see them, especially when the presumption is that MDF is merely cardboard. Funny, I thought the adhesive was important.

The implementation of the brace is way more important than the material. Use old dry dimensional lumber for all it matters!

Think about carbon fiber cloth versus a cured layup as an analogy.
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Last edited by DPH; Today at 06:04 AM.
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