I have a completely untested theory that if the loudspeakers are mounted flush
to room boundaries, reflections will not be an issue. a 1st order system might
then work with Omni (in this case hemispherical) speaker directivity.
umashankar
> Date: Tue, 1 Jul 2014 11:41:58 -0400
> From: m...@hacklava.net
> To: sursound@music.vt.edu
> Subject: Re: [Sursound] Ambisonics rig - loudspeakers directivity
>
> Tue, 1 Jul 2014 09:28:47 -0500, Sero <bassi...@gmail.com> wrote :
>
> > Hello All,
>
> Hello Serafino.
>
> > First, thank you very much for this amazing and very useful mailing
> > list.
> >
> > I have a query that might look like it is very newbie but it has
> > created a big confusion in my head when someone asked that to me
> > recently.
>
> I have a quick answer that hopefully is correct.
>
> > What is the best loudspeaker directivity (polar pattern) for an
> > ambisonics listening rig?
>
> I suspect that is should very directive.
>
> > I am very confused about this because I cannot find any reference on
> > this on any pubblication or discussion on the net.
> > My feeling is that the larger directivity angle the best (up to
> > omnidirectional) but I am still not sure about this.
>
> Because Ambisonics is a technique to create a sound field in a small
> sweet spot, interaction with the room should be avoided, especially
> at low frequencies. So the omnidirectional pattern is probably the
> worst.
>
> > We have a lot of discussion on decoding coefficient, decoding
> > directivities (in phase, max Re etc) but not on the best solution for
> > the transducer directivity.
>
> Or room treatment (passive and active); directivity is one way to avoid
> problems with the room.
>
> > I hope you can solve my uncertainty.
> >
> > Thanks
> > Serafino
>
> I think it's a matter of finding a trade-off; even with directive
> speakers, room treatment is important to avoid at least first
> reflections. And in a large room, where no treatment is possible,
> directive speakers should minimize problems.
> --
> Marc
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