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The guide describes B-format-decoding to Pentagon.
If you check the picture in Emigrator for the Pentagon-decode, you'll see that it has L-R-speakers "in front", and SL-SC-SR-speakers "in the back" (all with reference to the WXY-soundimage).
Since most of the listener's living-room configuration is such that L-C-F-speakers are "in front", and SL-SR-speakers are "in the back", you have to correct for this, i.e. rotate the sound-image as described.
If you don't, you'll hear it.
Cheers,
Ândreas
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