While researching on bass traps I came across this commercial grade rockwool at gumtree which claims to be 100kg/m3 density.
http://www.gumtree.com.au/s-ad/kewdale/art/rockwool-insulation-batts-1100x450x75/1118976211
Would this be better than the Greenstuf, Polymax, Earthwool, etc?
Also found Acoustisorb 2, 32kg/m3 density
https://www.ceilings.com.au/products/polyester-insulation/acoustisorb-2-32kgm%C2%B3/
Planning to cover all 4 corners with these from floor to ceiling.
Thanks.