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Originally Posted by
avare
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??? What does that have any significance on? You use equation 1.
The end of the pdf talks about a future test with wood studs and block walls with drywall attached. Equation one is for lightweight steel framing. I've always read that all other things being equal, you will get a lower resonance with light weight metal studs vs wood studs. I didnt know if there was a different equation for the other tests.
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??? Why would you place a tuned absorber behind a broadband absorber? You know how to build a high Q (50+) absorber? Any absorber of such selectivity is fine tuned in place.
Andre
Well, i wouldnt, but isnt that what the OP is planning on? and i do not know how to design anything with that high of a Q. I was just curious if there could be any appreciable effect from having deep fiber in front of a tuned system like the invisible alpha, but with only a 2% change in frequency, i see the change would not be signifigant enough.