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Originally Posted by Millo 3.1  EXCELLENT! I was thinking of doing something like this! I plan to stack two of each front corner of my room and cover the whole 8' height. Do you guys think this will work well? In terms of the absorptive material, can it be ULTRAtouch or Safe N Sound, or should it really be OC703? I'm just kinda unsure because of the itchiness issues w/ fiberglass, didn't want to have to cut all that much. Also, do the wooden bars on the back affect anything acoustically? Was planing on using facing, glued to the front fabric.
Like Ryuben, I also want my superchunks to NOT be permanent. |
Ultratouch should be good at the 3.5" thickness, but dont go for anything thicker, as the absorption properties seem to indicate that it might start to reflect at greater thicknesses.
I myself decided to take a big gamble and buy some unproven Isonat hemp/cotton stuff. I knew the 100% hemp was good acoustically, but I couldn't find any in stock at thickness I wanted so went for half hemp half cotton. Still waiting for proper figures on the hemp/cotton mixture (specifically waiting for gas flow resistance values.)
The stuff was an absolute bitch to cut, tried saws, blads, scissors, nightmare. Easy to use with hands, no protective gloves needed. I have very sensitive skin, rashes easily and I didn't get anything from man handling this stuff.
I still decided to wear mask whilst cutting though just to be on safe side.
Initial testing of just single panel on back wall didn't show much change in problem bass frequencies, but it did seem to improve the general soundstage quite a bit. Instruments sounded a tad more clear and could slightly better identify their pan position. This was with insulation just sitting loosely in frame. Hopefully once fabric goes on it'll still be as effective.
Once I get the air flow resistance figure I'll have a better idea of whether to stick with 100mm thickness or go 200mm for the other panels...
P.S. The insulation absolutely STANK when I first got it. Almost like a vinegary smell, must be the kind of salt they use, ammonium salt maybe?. Gonna let it air for few more days before I move it permanently into the studio.