On 02/17/2012 12:21 PM, Iain Mott wrote:
Here is an extract from the ambdec config file showing distances and
angles:
/speakers/{
add_spkr 1 1.297 54.0 0.0 system:playback_1
add_spkr 2 2.721 111.0 0.0 system:playback_2
add_spkr 3 3.290 156.0 0.0 system:playback_3
add_spkr 4 3.290 -156.0 0.0 system:playback_4
add_spkr 5 2.721 -111.0 0.0 system:playback_5
add_spkr 6 1.297 -54.0 0.0 system:playback_6
/}
do i understand correctly that the listener will be sitting on this very
off-center chair for most or all of the performance? i'm asking because
ambisonics won't perform at its best so far out from the sweet spot.
you seem to have adjusted the delays already to this position, right?
if possible, move the speakers to the correct angles relative to the
chair as well. they won't have to leave the walls, only the side
speakers should go forward a bit, and the rear pair spread out more. you
might get into trouble with corner reflections and might need to apply
some eq, but it should be possible to make it sound ok.
As order goes up AMB panning will concentrate more energy in the
nearest speakers and the two systems converge, the main difference
being that AMB will never use just one speaker, and this results in
smoother movement. The difference between the two systems becomes
smaller, and the advantage moves towards AMB.
VBAP does have a spread value - which i have set to 10 (out of 100)
presently. Does help smooth the movement - but yes, I need to test with
full system (it's not been easy to arrange this).
iirc, matthias frank of iem graz did some research a while ago, and he
found that if you add enough spread to make movements perfectly smooth,
you end up no better than ambisonics.
if your listener is staying in the chair, second order should be fine.
tweaking the angles should help.
if you end up having phasiness problems due to the dead room, maybe a
height speaker or two could fix that...
best,
jörn
ps: where can i listen to this?
--
Jörn Nettingsmeier
Lortzingstr. 11, 45128 Essen, Tel. +49 177 7937487
Meister für Veranstaltungstechnik (Bühne/Studio)
Tonmeister (VDT)
http://stackingdwarves.net
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