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Room Acoustics Forum by Rives Audio Welcome! Need support, you got it. Or share you ideas and experiences. |
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Room Acoustics Forum by Rives Audio Welcome! Need support, you got it. Or share you ideas and experiences. |
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In Reply to: RE: Hmmmmmm... posted by joamonte on July 5, 2009 at 02:32:52:
I don't have any measurements of my room, and I don't think that measurements that are not correlated to human perception are of much use. In his paper
"The detection of reflections in typical rooms", JAES 1989, p.539
the authors (Olive & Toole) present ETC of the IEC room some of the threshold experiments were conducted in, in both treated and untreated conditions. The difference is clear, but since early reflections are merged with the direct sound within a time window, the size of which depends on the signal type (50 ms for speech, 80 ms for slow music) they do not represent any danger, if you will.
Lipshitz and Vanderkooy have written a paper about ETC
http://www.aes.org/e-lib/browse.cfm?elib=5837
which is maybe interesting reading (haven't yet read it myself).
It appears that when Dick Heyser introduced his TDS technique in the late 60's, for the first time it was possible to "see" early reflections, which initiated the different concepts of a reflection free zone in studio control rooms. No psychoacoustic research, no listening tests were made to connect the measurement to human perception:
Voetmann, "50 years of control room design", AES paper 7140.
So personally, I do not read too much into a measurement, ETC or other, when human perception is not taken into account.
My room is 4.9 x 8.6 x 2.5 m, speakers are 75 x 40 x 45 cm (h x w x d).
Klaus
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