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Originally Posted by DanDan  I note that I have never gotten reliable, repeatable EDT numbers in small rooms. We know that RT is not really defined in such small spaces. |
Yes and No. I'm often the one to point out that small rooms don't have "real reverb" but rather a series of individually decaying reflections. However, even a small room has real reverb when totally empty.
A few weeks ago we did a similar test, which I used as the basis of this article:
Hearing is Believing
That article has no data though I did make measurements. Then I decided to make it into a video and retested again more carefully. Anyway, I just loaded up the original files and they show nearly identical changes in RT60. And it's the change that matters almost more than anything. I've never gotten reliable (read: repeatable or sensible) RT60 data from the ETF software, but REW is not only reasonable but repeatable. The main difference between my last test and the one posted above is the first test had no bass traps in the ceiling corners. But the RT60 differences are visually about the same as for this second test. The attached screen-cap is from our first test. It's not labeled, but the green is bass traps and bare walls, and the orange is after adding diffusors over the bare walls.
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Does REW create these RT graphs using multiple measurement locations?
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Well, you can measure in multiple places and view the results.
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Did you drive both speakers? I get better Waterfalls and Decay readings with double drive.
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Yes, I do most testing with both speakers fed the same source in mono.
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I am intrigued by the decrease in HF RT caused by the Diffusors. Could those HF figures have been flutter or other rings or pings?
How many Traps, and of what type? Ditto Diffusors.
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Rather than spend time to describe it all here, you'll see the setup in the video soon enough. But it makes sense that diffusors would not only even out the times but also lower them due to losses within the wells.
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I am thinking the room described would sound very bright, a great vocal room, but I would be a very wary of mixing in it. Can you show the Frequency response and Waterfall plse?
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The room as fully treated is incredibly clear and
neutral, and fantastic for mixing. Again, you'll see not only all the data and photos of the setup, but be able to hear music recorded through microphones. And not only in the front of the room where RFZ reflections are absorbed, but in the rear too where you can compare diffusors versus bare walls.
--Ethan