Originally Posted by hugohuijer
Very soon I will be building DIY acoustic panels. Unfortunately, I am only able to chose out of the following rockwool types:
Rockwool 201 (density: 35 kg/m3)
Rockwool 433 (density: 45 kg/m3)
Rockwool 204 (density: 34 kg/m3)
Rockwool 504 density (140 kg/m3) !!
I am just asking for your opinions. Please rank them from best to worst!
Rank in terms of what? There is no "opinion" involved. The appropriate Gas Flow Resistance (GFR) varies with the density of the material, all other factors being kept the same. How deep are your panels? The deeper the panel, the less GFR is optimum. I do not recommend porous absorbers less than 100 mm deep. For that, the 433 would be best. For 150 -300 mm, either 201 or 204 should be fine.