Gearslutz Pro Audio Community - View Single Post - UK equivalents to 703 and 705 and density Q
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Old 15th November 2009
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Several things are getting discussed here. Rockwool is broady equivalent at slightly denser at around 48 kg/m^3 fiberglas at 64 kg/m^3. the relationship acoustically is not linear.

For thick bass traps, lighter is actually better. 48 or less kg/m#.