10.6

Table Of Contents
907Logic Pro User Guide
Table key
L = (Front) Left
Lc = Left Center
C = Center
Rc = Right Center
R = (Front) Right
Lm = Left Mid
Rm = Right Mid
Ls = Left Surround (Rear Left)
S = Surround (Rear Center)
Rs = Right Surround (Rear Right)
LFE = Low Frequency Effects
Encode surround bounce files made in Logic Pro
Surround mixes bounced in Logic Pro are not encoded. Surround bounce files can be
encoded in the Compressor app, available in the Mac App Store, or with dedicated
hardware devices and other software.
Common surround encoded formats include:
Dolby Digital: Dolby Digital (also known as AC3) includes the LFE channel. It is a
compressed format, commonly used for DVDs and digital terrestrial or satellite TV
broadcasts. It is also widely used for computer game soundtracks.
Dolby Digital True HD: An uncompressed (or minimally compressed) high bit-rate
format, commonly used for Blu-ray discs and high definition digital terrestrial or satellite
TV broadcasts.
SACD:Super Audio Compact Disc: The Sony-Philips version of DVD-A. SACD audio
is stored in a format called Direct Stream Digital, which has a sampling rate of
2.8224MHz. SACD discs must contain a stereo mix, but usually also offer a 5.1 mix
(although this is optional).
ProLogicII: ProLogicII uses two full-range rear channels, unlike the original ProLogic
(LCRS) format. It does not, however, use the LFE channel. In other words, this is a
5.0format, so simply disable the LFE channel if you want to deliver a ProLogicII
soundtrack.
DTS (Digital Theater Systems): Soundtracks generally sound better than Dolby Digital
EX equivalents because they use a 3:1 compression ratio, whereas Dolby uses a 12:1
ratio. Less compression means more storage space is required on the delivery medium.
DTS HD Master Audio: An uncompressed (or minimally compressed) high bit-rate
format, commonly used for Blu-ray discs and high definition digital terrestrial or satellite
TV broadcasts.