Extron electronics SSP 7.1 User Manual page 74

Dolby Pro Logic II/IIx Movie or Music
Dolby Pro Logic II builds on Dolby Pro Logic by breaking the mono surround channel into a
pair of stereo surround channels for playback in a 5.1 surround sound setup. This is achieved
by a matrix surround decoder.
Dolby Pro Logic II works only with two-channel source formats that are used in a 5.1
configuration. It is available as Dolby Pro Logic II Movie and Dolby Pro Logic II Music.
Dolby Pro Logic II Movie is used for VCRs, TV broadcasts, and all programs encoded in Dolby
Surround. Dolby Pro Logic II Music is used for any stereo music recordings.
Dolby Pro Logic IIx Movie and Music extend the Dolby Pro Logic II matrix decoding
technology to derive up to seven channels from two-channel or multichannel sources, which
provides additional outputs for surround back channel effects.
Both the Movie and Music modes produce up to seven full bandwidth matrixed channels.
Music mode has hard back effects (shared across all surround speakers) instead of just the
back speakers, which the Movie mode has.
Dolby Pro Logic II/IIx Music mode provides an additional set of commands to tailor the sound
to individual listening tastes.
Dimension control
This alters the ratio of L+R to L-R for two-channel input signals. This has the effect of
adjusting the sound field towards the front or towards the back, making the sound more or
less spacious.
Center Width control
Pro Logic decoding produces a single center signal that comes from the center speaker. If
there is no center speaker, a "phantom" center image is produced that is split between the
right and left speakers. Center Width control allows variable adjustment of the center image
so it is heard only from the center speaker, only from the right and left speakers, or from all
three speakers in varying degrees.
Panorama control
This extends the Center Width control, so that all or part of the center image can be heard
from the surround speakers for a "wraparound" effect.
Dolby Digital Pro Logic IIx Movie or Music
Both Dolby Digital Pro Logic IIx Movie mode and Dolby Digital Pro Logic IIx Music mode
build on the Dolby Pro Logic IIx matrix mixing technology to create two additional surround
back channels (right and left back) from the original Dolby Digital 5.1 channel information.
The Dolby Digital Pro Logic IIx Movie mode (applied to multichannel sources) uses the same
Dimension, Center Width, and Panorama controls that are available for Dolby Pro Logic IIx
Music mode (applied to stereo sources). For more information, see the section above.
NOTES: This listening mode is only available when the SSP 7.1 is set up for 6.0 to 7.1
channel outputs and a multichannel Dolby Digital source format is present.
Dolby Pro Logic IIx Movie and Dolby Digital EX are electronically equivalent when
the system is set up for 6.1.
SSP 7.1 • Reference Material 68