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?
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