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In Reply to: RE: What is your question? posted by KlausR. on February 15, 2013 at 04:34:39
I dont find that surprising.
Have you found a method that is trust worthy based on flow resistivity?
Have you found any value to any online calculators such as : http://www.stanleyhallstudios.co.uk/pacalc/pacalc.php?s11=2&d11=52&v11=27000&s12=1&d12=153
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Well, this issue has been never mentioned in acoustics forums, so when I discovered it a few weeks ago it came as a surprise to me.
Apart from an acoustic ceiling I don't have any absorbers, and since I did not read any technical papers on this issue other than relating to ISO 354, I don't have enough knowledge to have an opinion on flow resistivity based methods or simulators.
Bosmans, "Sound absorption of stretched ceilings with an impervious synthetic membrane", J. Acoust. Soc. Am. 106, 233 (1999)
Klaus
I would acknowledge that I havent ever seen the burden of proof illustrated as you have presented it in acoustic forums, no. Good job by the way :) But those of us that treat rooms and have used different materials have made room measurements and compared our results to manufacturers claims and found them to be inconsistent. At least I have.
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