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

> two people neither of whom have listened to the effect of the product being discussed. <

I heard them in the lab room at my company's factory, so I know for certain that the Cathedral panels do not do anything useful.

> everyone who has used any of these products and heard a meaningful difference is deluded <

Deluded is a strong word, and I prefer to say "mistaken." But you're correct - some people think they hear a change even when there was no change. This happens all the time, and anyone who truly understands audio and how we hear knows this.

> 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. <

Even if that were true, which I doubt, the net effect would be improved peaks and nulls and ringing. As David said, "Either the claim is wrong or the plots are wrong. They made the claim and they provided the plots. The plots do not support the claim."

I don't think much more can be said! :->)

--Ethan

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