enclosure material question

OK, I've decided to build a new enclosure out of wood... Any tips? Also, I need to know what type of wood (and depth) to purchase. Thanks!

enclosure.... FOR WHAT?!

be specific with what you are trying to build so that people can help you out.

most people use 3/4" MDF to build audio enclosures in

LOL... it's for a subwoofer...

i take it you want to build a sealed box for it then?

3/4" mdf,wood screws, and some silicon sealer or liquid nails should do the trick. just make sure you match up the volume with what the sub recommends

if you use silicon, make sure it's dry before you throw your subs in. The gases they give off can screw up your surround.

Here' is my diagram: i end up like .8 cu inches short of 1 cu foot, do you think that's sufficient? Thanks...http://files.automotiveforums.com/gallery/watermark.php?file=502/57832sub_encolsure-med.JPG

it doesnt sound too bad but here is some advice. I would make the box bigger if at all possible. One thing i have a feeling u are forgetting is the thickness of the wood you are going your use 3/4 of an inch may not seem like much now but when its on all sides you are really gunna loose some volume. to everyone ALWAYS ALWAYS FIND VOLUME INCLUDE MATERIAL THICKNESS. However if you have already thought of that an u are only .8in short that is relativly insignificant but most subwoofers recommend a minimum of 1 cubic foot, so you are a lil short of the minimum, like i said if at all possible go bigger

the other thing people forget to do is subtract the volume of the woofer basket.

i had my subs in a 4.6 cu ft box and then i made 2 new boxes that were about 1 cu ft a peice and my subs sounded so much better. now they are louder and have better sq.

I have included the thickness of the wood, but I didn't think about the depth of the subwoofer... Will that make much of a difference?

well, a subwoofer basket is pretty big, you may be able to compensate by using polyfill though.

How much polyfill should I use? Where do I get this stuff?

you can get it at a fabric shop. It's just the filling they use for stuffed animals and such. It's just polyester fibers I believe. Hence the name POLYfill, I think lol. Anyhow, general rule of thumb is about 1lb for every 1 cubic feet.

most subs have their basket displacement on their spec sheet

What exactly does the polyfill do? If I use a full pound, will that increase my sq dramatically? Or should i use less than a full pound... more if my box is too small? I guess my real question is, if my box falls shorter than expected (EG I cut something wrong) will the polyfill help the sq enough to make it sound like I have a full cu foot?

polyfill tricks the speaker into thinking it's in a bigger box

But that doesnt answer his question. I guess it would depend on how much ur short, so let me rephrase your question, How much volume does 1pound of poly fill "add" to your box volume

thats up in the air and for the speaker to decide.