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Couple of things I wanted to add:
First materials....
Owens Corning is the usual choice but that's mainly because you can get it everywhere, even Home Depot or B&Q can get it in for you (although not quite the cheapest source).
When choosing insulation material, think about what frequencies you're looking to damp/absorb/fix; 703 is decent broad spectrum insulation but if low sub bass is your main consideratio you may want to consider 705 or better still, Auralex Fibreboard, which is waaaaaay denser than 703 or even 705.
As for the burlap, you can buy specific burlap, but you can also just go and find a medium weight fabric that allows air to pass through - just out your mouth up to it and force some air though - if you get anything more than minimal resistance it's no good but if it lets air pass through then you're good.
As Anthony did, I wouldn't bother with the metal stud, unless you're doing permanent installation in a commercial environment (in which most states require metal studs rather that wood frames for construction puropses).
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