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Old 14th March 2008
Lives for gear
Hannes_F's Avatar

Originally Posted by Ydope View Post
Very intersting topic!
Those simulation are a bit contradictory to the density tests Ethan made.
If 705 has about 45 kPA and 703 has about 17 kPa, the simulation indicates that 705 should work worse in the bass range but in the tests it never works worse. Not for 3" thickness and not for 6" thickness.


Look at Bob Gold's absorption coefficients and you find:

125 Hz
1" on wall: 703 0.11 - 705 0.02
4" on wall: 803 0.84 - 705 0.75

Two of many examples I see at first sight.