[bpape]

Believe what you want. You're welcome to your opinion.

Differences of less than .10 should probably be taken with a grain of salt - especially as you approach 1.0. However, when I see 2 materials and one is DOUBLE the other at 125Hz (and I've confirmed this in real world appciations, not in a test chamber) then I pay attention.

You are correct in that numbers over 1 are not applicable when covring an entire surface. Once again I'll state that the numbers should not be taken as absolutes, but as relative values for purpose of comparison. In addition, you make the basis of your argument on these being 'thick' materials. I hardly consider 2" 'thick'.

Lastly, In a typical design, there are a lot of edges of absorbtion exposed - not just fronts. So, don't be so quick to dismiss the benefit that the measurement anomoly shows. I use this to my benefit all the time in doing soffit based bass absorbers. Take 12" of material 24" wide. Build a false soffit. With your theory, I'd only consider the 12" of thickness over the 24" width. However, I also get a 12" high by 24" thick absorber on the SIDE of the soffit.

I'll agree that where you put treatment and how much of what kind and thickness is critical to proper treatment of a room. I was merely taking exception to your statement that 'they're all the same - doesn't matter' - it does.

Bryan