Aaron91RS

iTrader: (2)

My cheap self is not buying MDF to build my next sub box. I am using plywood since I already have it. What if I took that rubberized undercoating you can get from Wal-mart and sprayed it on the inside of the box. This should create a real nice air tight seal. Would the rubber absorb/lower/distort/change the sound in any way? Would it help?

Justins86bird

The reason to use MDF is because of its strength and density. I would not recommend using plywood.

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-Justin-
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JP84Z430HP

If you absolutely must compromise, I would go with no less than standard particle board, or sometimes refered to as underlayment. I have built a few boxes with 5/8" particleboard with good results. I'm sure the MDF would be better, but at half the cost.....

Regular plywood probably wouldn't be a good idea, though.

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Working on:
'84 Z28 LG4 305
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deadbird

You can use plywood,,,, if you really must. If you do though,, use pleanty of bracing, line the box with carpet pad or use the cotton batting from a pillow and tub & tile caulk seals joints nicely & actually makes a real strong adhesive.

I'd still rather come off a few $'s for the good stuff

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Jim85IROC

iTrader: (2)

For the sake of a $15 sheet of particle board (hell, in some areas MDF is that cheap) I really wouldn't **** around with plywood. BUT, regardless of what you use, the precision of your cuts is extremely important to ensure a proper fit in the joints. You also want to be sure to silicone all of the interior joints, and after that dries you can spray rubberized undercoating all over the inside. Not only will this help to plug any small holes that you might have missed with the silicone, but it will add mass to the wood and help damp it.

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Ehelmsin

I have a friend that uses partical board, and all though it isnt the right thing to do. (I agree with not using plywood!) After he cuts the wood he basicly soaks it in all sorts of wood treatments to seal it and make it more soild. It doesn't come out bad. He did this when he picked up some cheapo subs and wanted to add them to his surround sound for his tv. It didn't sound bad, didnt sound great either, but it did help fill in the low end.

Jason E

Spend the $$ and get the MDF, or at least particle board. It ain't gonna be right otherwise.

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Jason E
'89 Camaro RS 2.8
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