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Old 3rd November 2013, 04:47 AM   #1
dklk is offline dklk  United States
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Default Why Does It Matter.....

If you use MDF or birch ply if you use damping material to damp the inside any way?.......
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Old 3rd November 2013, 09:13 AM   #2
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Stuffing doesn't stop panel resonances.
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Old 3rd November 2013, 10:55 AM   #3
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Plywood is stiffer than MDF and this helps lower the amount of damping material needed. Plywood is also lighter, takes screws better than MDF (especially over multiple uses), and is generally more durable.

MDF has it's own virtues, but stiffness is not one of them.
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Old 3rd November 2013, 04:14 PM   #4
sippy is offline sippy  United Kingdom
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Using the 'search' option will bring you a few results dklk - Plywood v MDF might be a starting point.
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Old 4th November 2013, 03:08 PM   #5
chrisb is offline chrisb  Canada
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Take a snack, and bathroom break before you sit down to research this one - no shortage of "discussion"

The easiest way to answer the question for yourself might be to build two pairs of the same enclosure design from both - not a desk top mini-monitor, but a full sized MLTL or BLH for example. As I believe I've posted on this topic within only the last week or so, I did exactly that about 10 yrs ago, and have stuck with BB or superior grades of "high density" multi-ply since. And oh yes, not all "multi-plys" are created equal.
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Old 5th November 2013, 08:32 AM   #6
ODougbo is offline ODougbo  United States
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What about a Hybrid box?

1st: Make the interior panels out of 1/2" ply (with internal bracing)

2nd: Laminate 1/2" mdf over the entire box, all 6 sides

Advantages: easy build, can router edges with ease, no end grain and 1" solid walls; certain to pass the knuckle test.
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Old 5th November 2013, 07:47 PM   #7
chrisb is offline chrisb  Canada
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certainly a valid approach, depending on your personal goal for the "knuckle test", but no end/edge "grain" on routed MDF? well, maybe not after several coats of high solid primer /sealer
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Old 5th November 2013, 08:09 PM   #8
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The best solution for this is BRACING the cabinets no matter what material you use MDF or Plywood, stuffing cabinets will help for sure, but will not solve problem.
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Old 5th November 2013, 08:13 PM   #9
sreten is offline sreten  United Kingdom
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Hi,

FWIW if ply is superior to MDF due to mass versus stiffness
then low grade low density ply used in thicker sections of
less weight will be superior to higher grade plywood.

It won't be as strong, but due to the extra thickness, stiffer.

rgds, sreten.
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Old 5th November 2013, 08:38 PM   #10
ODougbo is offline ODougbo  United States
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One more thought about a mix of both; wish I had done this on a few projects. The dowel in the side of mdf ploy doesn't carry very far.

The outside box in sketch is mdf, can build-in plywood "bar -bells" with a few steps, and will help take the ring out of the box.
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