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In Reply to: RE: Did you bother to check all of those references… posted by David Aiken on December 25, 2007 at 12:38:51
What Everest means is that if you want to manipulate lateral reflections you have to get rid of the other ones first, nothing more. The less reflections you have in a room the more the remaining reflections are audible. So interfering here means interfering with a possibly beneficial manipulation.
When you apply reflection treatment you are changing the spectrum of the sound at the listening position, and maybe the spatial impression. If you like a different spectrum, that's ok but what does that prove? If you like a different spatial impression, that's ok but what does it prove? Did you read Toole's paper "Loudspeakers and rooms for sound reproduction – a scientific review"? The central sentence of this paper is “The inevitable conclusion is that, in natural listening, room reflections are not problems.”
I add a short passage of my writeup:
"It has been found that normal reflections in typical living rooms do not interfere with perception of the recorded space (Olive et al. 1989) and that for music enjoyment reflective walls have better effect (Kishinaga 1979)."
Olive et al. (1989), “The detection of reflections in typical rooms”, J. of the Audio Engineering Society, p.539
Kishinaga et al. (1979), “On the room acoustic design of listening rooms”, Audio Engineering Society preprint 1524
Everest is basing his book on available research. I'm afraid that he has not read everything known in the field. His recommendation for reflection treatment is based on Olive's findings exclusively, as far as I remember. Olive investigates single reflections, not a complex sound field, he does not investigate what happens when the reflection is attenuated by x dB, and he certainly does not qualify the reflection as detrimental just because it is above the image shift threshold.
Klaus
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