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Old 07-04-2016, 11:06 PM
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I understand using 3/4 MDF for the majority of box construction, but why couldn't you use 5/8 for the less important stuff like vents? Wouldn't that allow you to increase bracing without affecting the internal volume so much?
I have even toyed with the idea of a 5/8 box with one layer of fiberglass on the inside to seal it up and make it stronger. In my body shop days we used balsa wood and fiberglass for boat hull repairs. Just sayin'
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Old 07-05-2016, 04:56 AM
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A single layer of glass on a flat surface is too elastic to control any panel resonance. It's great for non-flat surfaces if you can build up a few layers, but otherwise won't do much.

The pressure differential between the compression and rarefaction swings in a vented enclosure is higher than that of a sealed enclosure, so typically a vented enclosure will need to be stronger to hold up to those oscillations. That being said, 5/8" is perfectly acceptable for most enclosures that are less than a few cubic feet, especially with low-power situations. Bracing can really reduce the need for thick walls; if two parallel sides of an enclosure that measure 1/2" thick have a perpendicular brace running between them, it increases the stiffness to about the same level as if they were 1" thick material with no brace. So if you want to use 5/8" but add a few braces it should be a really strong box.
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Old 07-05-2016, 08:22 AM
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got cha!! I have never been an all out BASS Beast chasing numbers. I have built a few boxes for myself and find the 5/8 to be acceptable for my applications. However I still like to cut dado joints where inner panels travel through the box just to get a little extra glue surface. Now, riddle me this, when someone gives the cubic displacement of a box, why do they give the port displacement in square inches?? do you just follow the path of the port and that's the magic number, or what?
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Old 07-05-2016, 08:38 AM
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LOL just did a Youtube video lessonnow I understand. More often than not I was at the mercy of manufactures suggested box dimensions because I didn't get the method behind the madness
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Old 07-05-2016, 01:11 PM
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For general purposes, (systems less than 1,000 watts), you can use any thickness really. Just depends how crazy you want to get with bracing, power, weight of sub, tuning, etc. You truly have to attack each scenario differently.
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