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Old 7th January 2013, 01:28 PM   #131
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Last week I was listening to a 2-> 3 matrix with coeff 0.5 in Reaper (I'll upgrade to Markus' script, thanks for posting that). For the afternoon I'm using Dolby PLIIx from my soundcard (Xonar) output.

What exactly does it do frequency wise? It cuts up processing band by band, but how? The Wikipedia article doesn't really say. Or am I totally mistaken and it is just a sqrt(2) center if I'm using 3 speakers.
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Old 7th January 2013, 02:39 PM   #132
Elias is offline Elias  Finland
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Quote:
Originally Posted by lolo View Post
What about directivity? I finally had 2 hours for myself last night and experimented with three quickly made pipe speakers, matrix from my old denon receiver and dayton RS100. It works!
I also started with cardboard tubes (diam about 12cm, length about 40cm) and FRS8 full range elements I lifted the tubes so that elements are on ear height. First listened with elements aimed to the listener, then aimed the elements towards the ceiling. This was with passive matrix wiring with coefficient of 0.5. So they were kind of omnis.

Then I placed a large (60*80cm) baffles just behind each tube to make them 2pi radiators, and it was much better !

Omni midrange ? I don't like it very much. It sounds too ambigouos and not very clear. Half space midrange is better, also with matrix.


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Old 7th January 2013, 02:43 PM   #133
Elias is offline Elias  Finland
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Quote:
Originally Posted by lolo View Post
maybe?
Is it anywhere like this you made ?
Click the image to open in full size.
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Old 7th January 2013, 02:49 PM   #134
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Quote:
Originally Posted by Elias View Post
Omni midrange ? I don't like it very much. It sounds too ambigouos and not very clear. Half space midrange is better, also with matrix.
I currently have cardioid mids. Much better and more clarity than with narrow boxes or dipoles too close to the wall.
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Old 7th January 2013, 04:37 PM   #135
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Originally Posted by SEdwards View Post
I'll upgrade to Markus' script, thanks for posting that
If you use the energy-preserving code then remove the 3dB attenuation for the center. Simply replace
Code:
c_out = 0.7071*m_c;
with
Code:
c_out = m_c;
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Old 8th January 2013, 07:58 AM   #136
lolo is offline lolo  France
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Yep, something like that, but with three separate pipes and a 90 deg angle so they come out as three flowers. I really have to redo it there is just too much omni leakage in the mids, will report back.


Quote:
Originally Posted by Elias View Post
Is it anywhere like this you made ?
Click the image to open in full size.
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Old 19th February 2013, 10:54 AM   #137
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Just for the sake of completeness here's the "final" Reaper code for a energy-preserving matrix decoder after Gerzon:
http://mehlau.net/audio/matrix_decoder/
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Old 11th March 2013, 08:45 AM   #138
Elias is offline Elias  Finland
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I found some more confirmation on Trinaural matrix coefficients from here

http://www.nubert-forum.de/nuforum/v...42a5023fc0a493


And the matrix coefficients according to them are:
Quote:
L -> L - R/2
R -> R - L/2
C -> (L+R)/2
Which are the same as referenced earlier from another source.


The thing I don't know is how they know it


- Elias
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Old 11th March 2013, 09:15 AM   #139
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That's TriSonic (AES Preprint: "An Optimum Linear-Matrix Stereo Imaging System") with a matrix factor of 0.5.
Just a sub-version of Gerzon's energy-preserving decoder.
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Old 11th March 2013, 10:20 AM   #140
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A post by Elias just got lost?
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