[bpape]

I was responding kind of to the whole thread - sorry. The idea that the air is doing something is just not correct. Seriously, 4" of 703 on the wall vs 2" with a 2" gap, the 4" will win all day long. But, the leading edge is in the same place. 4" with a 2" gap behind (leading edge at 6" from the wall) is even better.

Daniel,

It won't make it absorb more, it will make it absorb better, deeper down into the bass. However, there is a point of diminishing returns. General rule of thumb is that the max benefit you'll get and stay broadband instead of narrower filtering is for the gap behind to be the same as the thickness of the absorbtion.

Corners are a completely different animal. But the thoughts are the same. 4" straddling the corner is not as efficient as a solid chunk down in the lower frequencies. This is where the rub is. 4" straddling (assuming the same face width) will actually have it's leading edge farther from the corner. However, there is SO much more absorbtion behind it with a solid chunk that it ovecomes this limitation (not to mention that a solid 2' wide chunk face is approx 12" from the corner at 45 degrees and 17" from the corner along the wall edges).

Bryan