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Also... WHAT is the difference between 703 and 705??? Which one is preferred for general sound absorption? Is one "better" than the other in terms of absorption? Does each have a different "favorite" absorption frequency range?
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Preferred is kind of a hard question to answer. The best bang for the buck is going to be 703, but the best is going to be 705. I will say though that 6" of 703 will work better then 4" or 705 and cost less, but will take up more room. See everything is a trade off.
Glenn