On 05/03/2011 09:29 AM, Aaron Heller wrote:
2011/5/2 Jörn Nettingsmeier<[email protected]>:
those "slightly more speakers than necessary" cases are a bit tricky...
first order over a 24 hemisphere is horrible,
At the 2008 demo I wrote about, other that the anomaly at the exact
center, I thought it sounded pretty good. So did most of the 60 or so
people who came though during the evening. Definitely not horrible.
ah well, bad choice of words. "below expectations" would have been
better. the IEM cube (24 speaker hemisphere) does not work very well for
first-order, but then their standard decoders are "not ambisonic" by the
usual standards in that they don't employ shelf filtering. in 3rd order,
it sings beautifully. when you use just a subset, say six in the
horizontal, localisation is definitely improved.
There was a quite convincing sense of the space in which the
recordings were made. In the Stravinsky recording, you hear the
reverberation of the brass instruments moving around the hall, as it
actually does. In the recording of the piano recital, you can hear a
slight slap echo from the front of the balcony above and behind the
microphone. The contrast from indoors to outdoors is especially
striking. As I said earlier, the envelopment and accuracy of timbre
are the keys for me -- they draw you into the performance.
agreed. i never found anything amiss with envelopment when using more
speakers than optimal for any given order, but localisation suffers.
the most striking experience of horizontal first-order degradation over
eight speakers was in the sala bianca in parma, using virtual ambisonic
speakers on their wfs system. fons demo'ed ambi rendering, and we switched
between six and eight sources.
Could you describe what you heard? I'm genuinely curious.
from memory (it's been a while), the sound sources seemed to widen
considerably with eight speakers.
also, the timbre seemed a bit duller. i found the same on other
occasions: first-order over eight seems less bright than over four or
six. you can fix this with a bit of treble shelf boost to taste, and
that will usually get rid of any clear preference your listening
subjects might have, but it does indicate that there is more combing
going on at HF.
--
Jörn Nettingsmeier
Lortzingstr. 11, 45128 Essen, Tel. +49 177 7937487
Meister für Veranstaltungstechnik (Bühne/Studio)
Tonmeister VDT
http://stackingdwarves.net
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