AVS Special Member
Join Date: Sep 2007
Location: Give a monkey a brain...
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What's the purpose of the insulation? If thermal, put fiberglass outside of the box. If acoustic insulation, I'd put it outside the box, and possibly line the inside with something specific (duckboard/other).
+1, the speaker manufacturer can give you the ideal volume of the back box.
I used scrap plywood for in-ceiling speaker backboxes, in the attic.
TheSoundProofingCompany.com has lots of educational material on their website, if you're looking for acoustic insulation.
Believe nothing, no matter where you read it, or who said it, no matter if I have said it, unless it agrees with your own reason and your own common sense. -Buddha
Give a monkey a brain and he'll swear he's the center of the universe. -Fishbone