| "Is the material ISOLATION material, is it yellow and a bit fluffly?
Do I need that + some form of board and put that in all 4 corners of my back wall... or do I just cover the entire wall??? If this is 90% I want to get all info on this and what to buy.. I live in Europe and we don't have 703 or 705."
It sort of "is" isolation material when used as the manufacturer intended, however it is one of the most common materials acoustical panels are made from. No foam, and no "boards". Just the material, and fabric.
You can see how it is situated in the graphic link above, and the picture I linked to also shows the material itself...
You'll want to wrap the material in breathable fabric with no wood or any thing solid on the back of the panels. I hope this helps!
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