Quote:
funky_waves wrote:
 Egg crate foam is best for vented box, it absorbes sound and stays in the box, a vented box with fiberglass insulation will be shooting glass fibers into your room for a long time.. |
Uhm, no...it doesn't work like that. Well, maybe if you tear the fibers loose into individual strands and place them in the port tube. Take a look at interior photos of any SVS and you'll find good old pink fiberglass insulation.
When purchasing egg crate foam, especially if you go the local craft store route, you might not know if you're getting closed cell or open cell. I'm pretty sure the closed cell has nearly zero impact and behaves closer to a solid body, actually taking some net volume away from your enclosure.
Either way, the purpose of the lining in most cases is to reduce unwanted frequencies and harmonics that make it through the crossover or are generated by the driver/port producing the fundamental. Fill, such as fiberglass, also has the similar volume increasing properties in a ported box as it does in a sealed.
I personally say go with R-13. Faced batting would make it a little easier to use your choice of adhesive to stick it to the walls. I used Loctite's PowerGrab in my last build to adhere R-19 faced (had it on hand from actually doing some work in the attic) to MDF.
-Brent