Apple Logic Pro 9 - Manual (Page 1157)

LCRS Surround Format
LCRS stands for left, center, right, and surround channel. This is the original Dolby Pro Logic
format. The surround channel (placed directly behind the listener) is a bandwidth-limited
(the treble content is reduced) monophonic channel.
–30°
0°
+30°
+180°
C
S
R L
position
Mixing
5.1 (ITU 775) Surround Format
5.1 (ITU 775) is used for a few surround standards. This is the most common of the surround
formats, and is the one you are most likely to use. The 5.1 channels are left, center, right,
left surround (left rear), right surround (right rear), and LFE.
–30°
0°
+30°
–110° +110°
Rs
C
R L
Mixing
position
Ls
1157 Chapter 39 Working with Surround