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RE: "their size is the equivilent of the size of the opening when a standard door is open one inch."

You gotta love this forum. Pages of commentary on how and why something works or doesn't work, primarily between two people neither of whom have listened to the effect of the product being discussed.

Actually I guess it is "products" being discussed, because anything small in the acoustics realm is being dismissed at the same time (or at best given a probability of actually having value that is "vanishingly small, as close to zero as I can make it."). Which means that everyone who has used any of these products and heard a meaningful difference is deluded, including of course anyone else who dares to post.

Ask any carpenter what he thinks of engineers:-)

Now that is off my chest, let me respond to a few specifics:

1. Unless the RPG perforated product also uses the Venturi effect, I doubt there is much similarity in the functioning. Venturi, by the way you engineers, has been in use in many other realms for a very long time making things like carburators function and (via a related principal) airplanes fly. Your comment on the RPG panels that "...we can assume that the mechanism of operation is similar" is an unwarranted leap. So is "...the Cathedral Panels are a passive acoustic treatment in the same way that my RealTrap panels are..."

2. You keep reverting to concepts of absorption. My understanding is that the Cathedral Panels do not absorb. They use the Venturi effect to create negative pressure to offset high pressure room nodes caused eg. by standing waves.

3. Since most of what we humans can hear is above 40hz, it makes sense that most of the changes from the introduction of acoustic treatment into a room will be apparent at above 40hz, even if the acoustic product is working primarily on standing waves below 40hz.

4. It is a good thing to have a product that is particularly effective at very low frequencies. A lot goes wrong at deep bass (standing waves again) and precious few acoustic products have their primary effect at these very low frequencies, especially anything that isn't bigger than a ... cow.

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