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In Reply to: Re: Cathedral Sound Acoustic Panel Lab Tests posted by Ethan Winer on February 26, 2007 at 14:53:16:
I think you meant "turned down 16dB"(instead of "6dB) and thanks for pointing that out, I didn't notice. But, damned if everything isn't exactly the same except that(just as you said).The only difference is the decay times from 20-56Hz. Is that simply an affect of lower volume?
Seems a little fishy without more explanation of extensive test information.
Follow Ups:
> Seems a little fishy without more explanation of extensive test information. <Even more fishy, today I find no mention of Rives on that data page. Am I hallucinating, or was there a section there just two days ago attributing this data to Rives?
Since I am seriously considering ordering 8 of these (~$700) if they are anywhere near as effective as the Waterfall plots imply, I figured it would be nice to get input from the actual testers as to the circumstances and results before spending a dime.
HowdyPerhaps you are remembering the next to last paragraph in http://www.audioasylum.com/audio/tweaks/messages/141762.html
Or perhaps this snapshot at fatwyre is the old info you are referring to http://www.fatwyre.com/email%2010_18_06.html where they say "For before and after plots prepared by Rives Audio and placement diagrams click here for technical information." with a link to the page above.
-Ted
> I think you meant "turned down 16dB"(instead of "6dB) <No, I meant 6 dB, though it's difficult to read the legends. Each vertical division is 3 dB, and the After graph is exactly the same as the Before graph except everything was slid down two divisions.
> The only difference is the decay times from 20-56Hz. Is that simply an affect of lower volume? <
No, the decay times are the same at all frequencies. If you look at the slopes you'll see they're exactly the same shape. It's just that the ringing trails have been pushed off the bottom of the graph. If the After graph were changed to display to a lower dB level, you'd then be able to see that the decays are in fact identical.
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