John Sayers' Recording Studio Design Forum Archive

Hi guys! I need your help (yes, again)...
It´s impossible to buy 703 here in Argentina, so i´m trying to find the best mineral wool for my project...
I can´t find the density of this product (Acustiver P from Isover), but i found this table...
I´m planning to buy the 75mm model...
Is that good insolation?
My walls are basically 2"x4" pine studs, spaced 100mm from my hollow brick wall, fill with wool and finished with 2 layers of 5/8 gypsum.
Should i go with this stuff or look for anything else?
Thanks!

From the low frequency data, it sounds like it's kind of light compared to 703; but for inside of walls, you won't see noticeable difference so it should be fine. If you use that for traps, stay with thicker than usual by an inch or two for better low frequency absorption... Steve