At 21:06 08-04-14, David Pickett wrote:
><http://www.stereophile.com/content/upward-mobility-2-channels-surr
ound-page-2>
There are also ways of Matrixing LR stereo to LCR described by
Gerzon in "Hierarchical Transmission System for Multispeaker
Stereo", JAES, Vol.40, No.9, Sep 1992 (and another article that
gives somewhat different coefficients that I cannot find at
present). I have played with the recommendations of these articles
with excellent results -- the coefficients are easy to set up with
RME's TotalMix. In such a case, the LR speakers need to be at +/-
45 degrees rather than the usual +/- 30.
I found the other article. It is "Optimal Reproduction Matrices for
Multispeaker Stereo", AES Preprint 3180 (91st Convention, NY 4-8 Oct.
1991). Figure 16 is identical with that in the Stereophile article
given above. This is a more sophisticated approach, which I have not
tried, though I found that matrixing without "frequency compensation"
was pretty impressive on some recordings.
David
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