Tue, 1 Jul 2014 21:44:49 +0530, umashankar manthravadi <umasha...@hotmail.com> wrote :
> 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 Hi Umashankar. Since there would be no reflections behind the loudspeakers, it would make active treatment easier, but passive room treatment would still be useful to avoid reflections from other walls. Anyway, there's not many omnidirectional loudspeakers (or drivers) apart from woofers. Directive speakers are also difficult to find, and good ones are using "wave guides" (special kind of horns). Jörn once mentionned about a very $pecial directional speaker. -- Marc > > 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 > > _______________________________________________ > > Sursound mailing list > > Sursound@music.vt.edu > > https://mail.music.vt.edu/mailman/listinfo/sursound - unsubscribe > > here, edit account or options, view archives and so on. > > -------------- next part -------------- > An HTML attachment was scrubbed... > URL: > <https://mail.music.vt.edu/mailman/private/sursound/attachments/20140701/c678da4e/attachment.html> > _______________________________________________ Sursound mailing list > Sursound@music.vt.edu > https://mail.music.vt.edu/mailman/listinfo/sursound - unsubscribe > here, edit account or options, view archives and so on. > _______________________________________________ Sursound mailing list Sursound@music.vt.edu https://mail.music.vt.edu/mailman/listinfo/sursound - unsubscribe here, edit account or options, view archives and so on.
