[PD] 6 speakers in a circle, ambi? vbap?

Thomas Grill gr at grrrr.org
Mon Oct 6 12:23:19 CEST 2008

I would say it depends mainly on where the audience is situated. If  
they are supposed to wander around off-center 6 speakers might not be  
enough in a larger room.
It also depends very much on the speakers, whether they have a narrow  
or wide diffusion angle and on other characteristics (e.g. whether  
they are horn-loaded etc.). Depending on the sounds material, your  
speaker type and the room you might also want to have one or two  
I'm not an expert on ambisonics but i had the experience that it  
doesn't work well in rooms which are not acoustically dry in which  
case you get a lot of ugly phase cancellations due to wall  
reflections. VBAP doesn't seem to be that sensitive in that respect.  
I guess that for the small number of speakers VBAP is the better  
choice - you might want to experience with the spread factor there to  
avoid too much focusing on one speaker.
I'm curious about the opinion of the IEM and SARC experts.
all the best, Thomas

Am 06.10.2008 um 06:39 schrieb Hans-Christoph Steiner:

> So I am working on sound for a permanent installation involving 6
> speakers in a large circular room.  Are 6 speakers enough to do
> anything useful using ambisonics?  Or am I better off using the
> simpler vbap?
> I am just starting to understand the basics of ambisonics, thanks to
> Florian's intro.  I will be programmatically controlling the position
> of the samples, since it will be synced up with a video.  So I don't
> think I really need the GUIs like cubemixer.
> Are there any simple, working demos of the IEM ambi stuff?
> .hc
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