On 11/09/2012 01:05 AM, Tommaso Perego wrote:
I'm a bit concerned now, as I would not know for sure if eight
speakers and 3rd Order could provide quite accurately a soundfield
for an area of 5x5 meters.
accurately as in "don't lose any sleep over selling full-price tickets",
yes.
Accordingly to what you wrote, it doesn't really matter in Ambisonics
if I place the loudspeakers at 6, 8 or 10 meters diameter... (as long
as the loudspeakers are powerful enough). Is that correct?
not quite. like i said before, it can be useful to place the
loudspeakers further away, because that evens out the SPL across the
listening area.
basically, there are two constraints for loudspeaker distance:
a) horizontal coverage angle - even a very wide speaker will have
trouble covering more than 100° without significant coloration. so don't
move them in too close. there is an illustration of this problem in
http://stackingdwarves.net/public_stuff/linux_audio/ambisonic_symposium_2011/AmbiSym2011-Nettingsmeier-Dohrmann_Large-scale_HOA_Systems.pdf
b) room reverberation - some reverb can be nice, but if the speakers are
too far away, you will get mostly diffuse field without much localisation.
Do you have any suggestions? How differently would you do?
start with a speaker radius that is 1.5 times the speaker radius, a bit
more if the room is large enough.
--
Jörn Nettingsmeier
Lortzingstr. 11, 45128 Essen, Tel. +49 177 7937487
Meister für Veranstaltungstechnik (Bühne/Studio)
Tonmeister VDT
http://stackingdwarves.net
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