On Mon, Sep 23, 2013 at 3:55 PM, Andy Furniss <adf.li...@gmail.com> wrote:
>

>
> I don't quite understand the "in phase" though, are you saying that they
> artificially adjust phase for the same sound that comes out of more than
> one speaker to affect the mixdown?


The Recording Academy recommendations for surround sound say (sec 4.3)

One potential problem that can arise from routing a signal into two or more
speakers is the danger of increased, and increasingly complex, comb
filtering. This problem multiplies as more speakers are engaged and can
become critical if downmixing is ever employed by the playback system.
Therefore, many experienced surround mixers selectively turn off channels
when bringing a sound "inside" the surround bubble or when dynamically
panning a sound from one area in the surround space to another.

It is recommended that whenever signal is placed into three, four, or five
speakers, it be decorrelated.



http://www2.grammy.com/PDFs/Recording_Academy/Producers_And_Engineers/SurroundRecommendations.pdf


--
Aaron (hel...@ai.sri.com)
Menlo Park, CA  US
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