what kind of fabric/material is best for making a "dead space"

1. Answered: 1261 day 5 h (0) | Permalink

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   tnjsax

   Ive been going through the acoustical treating phase myself. I have some auralex foam but Its not feasible to foam the entire room. I was thinking about buying a plexiglass isolation wall but it's way more than I want to spend. Making one of my own with plexiglass is just as expensive. I'd say, if you don't mind something heavy, use plywood to make the booth. Then, you can go crazy with deadening the sound. You can foam up the plywood... Or i've found that getting a cheap memory foam matress topper would work as well. I've draped three quilts over speaker stands and got decent results with that. Ultimately, if youre making an isolation booth, make it as versatile as you can.

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2. Answered: 1260 day 23 h (0) | Permalink

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   Justin Vencel

   You need to go about building yourself a set of gobos.  There are quite a few ways you can accomplish this.

   Lets remember that any acoustic foam regardless of who manufactures it will never absorb anything efficiently below about 300hz.  So this basically makes foam panels a nice way to control reflections and absorb extra high-end.

   Remember this when creating your gobos, it's not going to stop bass waves that might average 40 feet in length a just travel right around your barrier.

   That being said, I've had great success using a simple gobo to help isolate microphones from computer noise and other similar noise sources (simple higher-pitched noise sources).

   I built a set of gobos using 2x4's as a basis for the frame with a backing of cheap sheet board.  Then I filled the gap with Owens Corning fiber-glass and finished it off with acoustic foam.  You can then flip them around depending on weather you wanted the sound more or less reflective.

   For extra effect you can throw a sleeping bag or blanket over everything for extra absorption.

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3. Answered: 1247 day 17 h (0) | Permalink

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   Tom Drinkwater

   rockwool or semi stiff fiberglass panels (higher density grades) is cheaper than foam and is more effective across the audio band, (ie absorbs to a lower freq).

   I suggest 50mm high density rockwool on a wooden backing, covered in fabric.

   you don't want the glass particles in the air, so a impervious fabric is good. Old curtains with rubberised thermal backing are excellent, but any heavy fabric will do.

   For general room wall and ceiling treatment 50mm rockwool on a heavy corrugated cardboard backing mounted with a 30-50mm airspace from the wall is one of the best most cost effective systems.

   For baffles, you may want to use a heavier wooden backing to reflect those low frequencies back that the the rockwool doesnt absorb.

   foam is pretty useless at broadband reduction unless its super thick, and it will suck out a disproportionate amount of highs, making your room sound subjectively dead, without controlling lower frequencies at all.

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