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Re: I was hoping some technical explanation might appear....

David,

> It's ridiculous to suggest that something can't work because it doesn't operate in the same way as something else ... Sorry to come on a little strong on this one but misuse of the "laws of physics" and the implication that if something works, it can only be because they've been repealed really annoys me. The argument is logically invalid and not scientifically sound. <

I was tired yesterday when I replied, and did not give as complete an answer as I should have. I'll amend that now, and explain better why it is necessary to defy the laws of physics to do what's claimed in those waterfall graphs.

In order for those panels to have an effect as large as they show, each would need many Sabins of absorption. But they're simply not large enough! The definition of one Sabin is an opening to the outdoors one square foot in size. So it's physically impossible to get more than 1.22 Sabins from a single panel only 11 by 16 inches.

> The waterfall plots seem to show that the Cathedral sounds reduce the level and duration of reverberation within the room <

No, they really don't. If you were experienced with the ETF software you'd know why. When absorption is added to a room, the shape of the peaks changes in several ways. Specifically, the peak bandwidths are made wider (lower Q), the decay times are reduced (steeper slopes), and the peak center frequencies are also shifted down slightly. To absorb sound and not affect the peak Q and decay time and frequency is another example of "defying physics." I see none of those, only a lower volume level.

--Ethan

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