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15th November 2009
Old 15th November 2009
Lives for gear
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Joined: May 2004
Location: Hamilton, On Canada
Posts: 4,834

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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#.

Good studio building is 90% design and 10% construction.