[QUOTE=avare;4808186]There is no ideal air gap. It depends on what you have and what you want to do. For 703 I would not use thicker than 4" of materail. Beyond that I would have the appropriate gap up to 8" or so.
I would not use 705 if I had a choice.
No.
Quote:
lastly you suggesting that if i had layers of 703 pane
I jean the gap between the material and teh hard surface. NOT between the 703.
Andre
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thanks...i think get it.
so what you are saying it that you would use 4" of 703 and then an appropriate air gap to sort of tune the trap to deal with a rage of low frequencies.
how you do predict what the air gap should be? for a specific example i have an issue around 125hz and 140hz...i think because of the dimensions of my room 14x12x8.6 i have modes there...so is there a graph/chart or formula that would say that to dealing with these frequencies and this thickness of 703 which has these gasflow properties ishould make a panel that has this x air gap? how do you know?
or in this specific instance what would you do?
thank you and i am trying to learn as i go.
ej