> The modification I was thinking of would be to bring the 6 speakers on stands > into a hexagon on a plane. > Why? It makes it easy > to set up--but more importantly, I'd now have two > speakers set up at +/-60deg > for stereo compatible playback. OR, > it is also possible to do a bit more rearranging (rotating and adding 2 more > speakers) to include a 5.0 array in the set-up.
I have the setup that you might be thinking of, that is a hexagon with one speaker at front center, The +- 60 degrees speakers works fine for stereo if one moves the listening position back from the "ambisonic hotspot" For stereo and surround listening. The +- 120 degree speakers maps fine into 5.1 back channels as 5.1 back speakers really are back/side speakers. The radius of the setup is probably limited by the flore to roof distance. If you place 4 speakers at +- 60 and +- 120 degrees vertically referenced to the center front speaker you will get a 10 channel ambisonic system with height, Fons has already created a decoder setup for ambdec of this layout for me. According to Fons it is not a bad setup refering to the symmetry, and for the power amp you can use 2 home teater amplifiers with external decoder inputs. You have to get the volume control/gain setting identical for this to work well. I speculate more symmetric solution would be to use 4 speakers on the floor and 4 in the roof, Placement defined by "rotating" the side speakers in the hexagon +-60 degrees with the front and back speakers as rotational axis. This will also enable construction of a symetric layout with a slighty wider radius if the radius is limited by room height. But this will require 14 channels. - Bosse -----Original Message----- From: sursound-boun...@music.vt.edu [mailto:sursound-boun...@music.vt.edu] On Behalf Of Joseph Anderson Sent: den 25 mars 2011 12:10 To: Surround Sound discussion group Subject: Re: [Sursound] Reflections from the wodden floor on an ambisonic room.. Hello David, This sounds great! Congrats in getting the resources together to make this happen. I see there have been a number of comments regarding possible set ups--I'll add a few thoughts here as I've been thinking about putting together a 2nd order system. I was thinking of something along the lines of either an icosahedron, or a modified icosahedron. http://en.wikipedia.org/wiki/Icosahedron http://en.wikipedia.org/wiki/File:Icosahedron_model.JPG Placing speakers at the vertices means you'd need 12. The 2nd link above illustrates an arrangement for a true icosahedron. You'd have 3 speakers on the floor, 3 on the ceiling, and the remaining 6 on stands. (These 6 would be by the yellow struts in the photo link above.) The modification I was thinking of would be to bring the 6 speakers on stands into a hexagon on a plane. Why? It makes it easy to set up--but more importantly, I'd now have two speakers set up at +/-60deg for stereo compatible playback. OR, it is also possible to do a bit more rearranging (rotating and adding 2 more speakers) to include a 5.0 array in the set-up. ------ Re the floor.... I'd think about throwing some carpets or rugs down. Reducing reflections can make a big difference. My best, Jo ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Joseph Anderson 27 Hungate, Pickering, North Yorkshire, YO18 7DL, UK ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ On 24 Mar 2011, at 3:15 pm, david monacchi wrote: > we're planning to build in Pesaro-Italy a small ambisonic studio with 13 > loudspeakers (full 3D - 4@-45°, 4@0°, 4@+45°, 1@90°).. We're now in the > process of moving walls, treating acoustically the room, etc.. The room will > be 5.00 x 4.60 x 3.20h and we are planning to treat it to be as more 'dead' > as possible.. > > In order to have a 'pleasant' space, we're thinking to put a wodden floor > which, to a certain degree, will also help absorbing some low frequencies.. > > My question is: > considering that the room will be semi-anechoic, is the reflection from the > wodden floor really compromizing for the correct soundfied reconstruction? > Are there studies that you know with experimental data, or simply your direct > experience on this? _______________________________________________ Sursound mailing list Sursound@music.vt.edu https://mail.music.vt.edu/mailman/listinfo/sursound _______________________________________________ Sursound mailing list Sursound@music.vt.edu https://mail.music.vt.edu/mailman/listinfo/sursound
