Apple Logic Pro 9 - Manual (Page 1158)

6.1 (ES/EX) Surround Format
The 6.1 (ES/EX) format is used for Dolby Digital EX or DTS ES. The 6.1 channels are left,
center, right, left surround, surround (rear center), right surround, and LFE.
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Mixing
position
7.1 (3/4.1) Surround Format
7.1 (3/4.1) uses the same speaker configuration as 5.1, but adds two additional side
channels (left mid and right mid), placed directly to the left and right of the listening
position. It is designed for a big cinema, in other words.
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Mixing
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LFE
Lm
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1158 Chapter 39 Working with Surround