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SDP-2 Effects
JBL
Logic 7
Logic 7 Parameters
This film sound mode reproduces musical material with maximum separa-
tion at all times, whether or not directional material is being steered. In
addition, Logic 7 uses intelligent steering to extract wide bandwidth stereo
surround channels. If both side and rear speaker pairs are available, signals
may be steered between the left side and left rear, or between the right side
and right rear. It is also possible for a signal to be steered fully to the rear
speakers, with the side surround speakers 6dB lower than the rears to
provide subjective rear imaging.
Logic 7 contains the re-equalizer feature of the THX Cinema effect, as well
as Lexicon's proprietary dialog enhancement feature. The combination of
stereo surround information during music and decorrelated effects, with
discrete steering to the sides and rears, gives Logic 7 unrivaled performance
on surround encoded films.
Initial Value
AUTO AZIMUTH
ON
DIALOG ENHANCE
0.0dB
REAR ROLLOFF
20.0kHz2
REAR DELAY OFFSET
ON/OFF
0.008, +3.00B, +6.00B
453Hz-20.0kHz
15-35ms
ON/OFF
Front/Side, Front/Rear*
-5 to +5dB
710 to +1008
-30 to +05dB
ENABLED
ENABLED, DISABLED
* Dependent on speaker configuration
RE-EQUALIZER
SIDE ASSIGN
SURROUND LEVEL
SUBWOOFER LVL
EFFECT LEVEL
CUSTOM/TRIGGER
AUTO AZIMUTH is short for auto azimuth error correction/ automatic
input balance. Auto Azimuth should be set to ON for films, and OFF for
music. When ON, special patented algorithms continually monitor the
input signal and adjust both the relative level and time offset of the two
channels to keep the dialog properly centered and special effects properly
localized. This automatic feature is the reason the unit does not need an
input balance control for Dolby Surround decoding.
DIALOG ENHANCE boosts dialog in the center channel. By targeting
specific frequencies, it can boost only dialog, without raising the entire
center channel level (which would alter the output balance achieved during
calibration).
REAR ROLLOFF sets the cutoff frequency of a low pass filter in the rear-
channel. Frequencies above this setting are attenuated. This control should
be set high enough to give presence and airiness to the rear sound without
placing distracting instrumental overtones or other sounds behind you. In
systems configured without rear speakers, the settings affect the side out-
puts.
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