From the research that I have done so far, it seems that OC 703/705 is the popular/prefer material to use for bass traps and acoustical treatments, why? When looking at http://www.bobgolds.com/AbsorptionCoefficients.htm :
OC 703 3"
3.0 pcf (48 kg/m3) 0.53 1.19 1.21 1.08 1.01 1.04 1.10
Safe n Sound 3"
2.5 pcf (40 kg/m3) 0.52 0.96 1.18 1.07 1.05 1.05 1.05
Both materials acoustical absorption properties are very similar. I know that OC 703/705 are rigid vs Roxul semi-rigid, but if one builds a frame for it, isn't that a wash? The OC is very hard to find locally vs easy to find Roxul at Lowes or HD. Cost wise, Roxul is a 1/3 the cost of OC.
Is rigidity the deciding factor?
OC 703 3"
3.0 pcf (48 kg/m3) 0.53 1.19 1.21 1.08 1.01 1.04 1.10
Safe n Sound 3"
2.5 pcf (40 kg/m3) 0.52 0.96 1.18 1.07 1.05 1.05 1.05
Both materials acoustical absorption properties are very similar. I know that OC 703/705 are rigid vs Roxul semi-rigid, but if one builds a frame for it, isn't that a wash? The OC is very hard to find locally vs easy to find Roxul at Lowes or HD. Cost wise, Roxul is a 1/3 the cost of OC.
Is rigidity the deciding factor?