On 11/18/2013 11:34 AM, Moritz Fehr wrote:
Hi All,
some time ago, there was a discussion about setting up an ambisonic
playback system differently than in a circle - i would like to pick
up on that asking if you have experience that you could share. I am
planing a sound installation in a space that limits the speaker
placement to an oval. I would place the speakers in three circles of
eight each, one circle on ear level and the other two below and
above. Is there some way to compensate the oval form for a good
spatial listening experience in the sweet spot? The space is quite
large, the longest distance of the oval is about 20 meters, the
shortest about 12-14 meters. Mostly, the setup will be used to play
back sound field recordings of a cityscape. How would an oval setup
in your opinion affect the sweet spot?
not too much. you will want to delay the each speaker relative to the
one that's the furthest away. then, the effect is pretty much the same
as a perfect circle, except for coverage issues. if your close speakers
do not have sufficiently wide dispersion at HF to cover your entire
listening spot, you will have areas where the sound is a bit duller. not
a show-stopper, though.
however, if the entire 20m diameter circle is to be the listening area,
an extremely off-center listener might encounter runtime differences for
sounds from the opposite which are so large that they won't be fused
anymore and might be perceptible as distinct echoes.
worse, the "wrong" early cues will also be significantly louder than the
correct ones because you are using point sources which will drop in
level considerably over that distance.
this is why we tried such a setting with short line arrays (less level
drop):
http://stackingdwarves.net/public_stuff/linux_audio/ambisonic_symposium_2011/AmbiSym2011-Nettingsmeier-Dohrmann_Large-scale_HOA_Systems-Slides.pdf
http://stackingdwarves.net/public_stuff/linux_audio/ambisonic_symposium_2011/AmbiSym2011-Nettingsmeier-Dohrmann_Large-scale_HOA_Systems.pdf
if your installation is going to be public, please let the list know
when it's ready and where it can be heard.
best,
jörn
--
Jörn Nettingsmeier
Lortzingstr. 11, 45128 Essen, Tel. +49 177 7937487
Meister für Veranstaltungstechnik (Bühne/Studio)
Tonmeister VDT
http://stackingdwarves.net
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