Help on the filling please?

[fouchagalaga]

I've just finished building the enclosure for my 12'' Dayton sub :http://daytonaudio.com/files/specs/S..._specsheet.pdf
I know that I will fill with polyfill... but should I put some of that black foamy thing on the walls (I don't know it's name) or will it not be necessary? If I do need to put some.. where? My enclosure is 70 L and ported if that's of any help. Any suggestions appreciated! thanks!
Edit: I can buy polyfill at any fabric store right? I don't need anything special?

[Cokewithlime]

Since it is ported you really don't need to stuff it, I would suggest just go to the bedding dept of your local WalMart(yes, there are WalMarts in Canada, lol) and purchase some inexpensive eggcrate bed topper foam.

Then just line the back and perhaps the sides of your enclosure - you can stick the foam on using 3M 77 spray glue which you can get at Home Depot. Spray just one surface at a time of enclosure and one piece of foam at a time - let them dry a little until they get tacky and then carefully place the foam on the sprayed surface of the enclosure.

You might want to just start with the back wall and then have a listen - if it sounds good then no need to add more.

[fouchagalaga]

No polyfill?

[MaVo]

Not every enclosure is designed to be filled. You have to check this with the manufacturer.

[Cokewithlime]

Originally Posted by fouchagalaga

No polyfill?

With sealed subs almost always yes.

With ported subs - sometimes - but stuffing with fiberfill can have a detrimental effect on tuning and overall performance. In a ported sub the fibrefill will not do anything to reduce LF reflections inside the enclosure but can help with controlling harmonic frequencies

Usually just start with the foam eggcrate I suggested earlier and then start listening to the sub with lots of different program material and your ears will tell you if you may need to add any fiberfill.

[fouchagalaga]

Thanks! Can I use mineral wool? I have alot of that laying around in my garage.... if not I'll go get some eggcrate foaming.

[Cal Weldon]

Mineral wool is good.

[fouchagalaga]

thanks alot I hope to be able to finish this before tonight

[Village Plank]

What finish are you going for?

[Cokewithlime]

Originally Posted by fouchagalaga

Thanks! Can I use mineral wool? I have alot of that laying around in my garage.... if not I'll go get some eggcrate foaming.

You can use it, but the thing I would caution you is that with a ported enclosure you take the chance of continuously having small fibers of the mineral wool being blown out of the port and into your living environment - they can be irritating to people and pets.

btw - these small fibers are also potentially not so good for your expensive sub driver in the enclosure, which is why I recommended the egg crate foam.