just to pitch in - I've never liked running multiple subs from the W channel (leads to "in head" bass)
in a large area, I once ran a dome of 32xmid'n'tops, which displayed 1st, 2nd and 3rd order periphonic material, along with 8 XSubs around the periphery, 1st order decoded from wxy - worked very well and no horrible nodes. Actually, the (1st order) crossover point was about 110Hz (I seem to remember) and there was no sense of the subs pulling localisation downwards cheers Dr. Peter Lennox Senior Fellow of the Higher Education Academy Senior Lecturer in Perception College of Arts University of Derby Tel: 01332 593155 ________________________________________ From: Sursound [sursound-boun...@music.vt.edu] On Behalf Of Jörn Nettingsmeier [netti...@stackingdwarves.net] Sent: 20 April 2015 10:10 To: sursound@music.vt.edu Subject: Re: [Sursound] ENVELOP - 3D Sound, on Kickstarter.com On 04/20/2015 12:07 AM, Stefan Schreiber wrote: > All valid points. > > But how would you build a good Ambisonics rig for home use, then? > > You might need three or four subs if the range of your speakers doesn't > go down far enough... If you don't have space, I would (still) go for > good speakers, at least down to about 40 hz. > > And maybe we should distinguish between a large area rig (Jörn) and a > home system, for further and more accurate discussion. The large area PA > system will be cheaper if you use subs. In home systems you will have > the typical space restrictions. Fair point, although even at home it might be easier to hide one or more subs and keep the rest of the speakers as compact as possible. > You could use one sub of your 5.1 system, as long as you have one. > Typical Ambisonics software decoders for 4.0 or 5.0 layout won't support > the .1 subwoofer. (Or are there some?) Just hook it up to the W channel. That assumes matched gains and crossover, which should be provided by most if not all home theatre sets. > Jörn: With which software and measures are you actually driving your > system? You could filter the channels and (basically) drive two decoders > for 3rd order (main PA speakers) and 1st order (for the 4 subs). (?) It's usually ambdec. And yes, that's indeed what I do. During testing, there will be two instances of ambdec for subs and tops, and for production, I usually fold their configurations into a single matrix for ease of use. > A normal "sound processor" style filtering can't be applied in this > case, because of the mixed 8 speakers/4subs PA system. So aren't you > using a "mixed-order decoder" in the 1st place? (Quotation marks > intentional, as the source is TOA. You still have 8 + 4 speakers/subs. > to drive.) I don't understand what you mean by "sound processor". Yes, a system made of, for example, 16 tops and 4 subs like this one [1] would be mixed-order, but even then, the area of good-enough reconstruction is way larger for the first-order bass than for the third-order treble range. [1] http://stackingdwarves.net/public_stuff/ardour_photos/Ardour-Klanglabor-2.jpg -- Jörn Nettingsmeier Lortzingstr. 11, 45128 Essen, Tel. +49 177 7937487 Meister für Veranstaltungstechnik (Bühne/Studio) Tonmeister VDT http://stackingdwarves.net _______________________________________________ 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. The University of Derby has a published policy regarding email and reserves the right to monitor email traffic. If you believe this was sent to you in error, please select unsubscribe. Unsubscribe and Security information contact: info...@derby.ac.uk For all FOI requests please contact: f...@derby.ac.uk All other Contacts are at http://www.derby.ac.uk/its/contacts/ _______________________________________________ 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.
