Lexicon CP-1 PLUS V2.0 Owner's Manual page 36

CP-1 Digital Audio Environment Processor
rear channels are rolled off above 7 kHz until the logic circuits steer a sound
effect to the rear speakers, whereupon the bandwidth opens up to beyond
15 kHz. This will enhance the realism of some effects that move from front
to rear or vice-versa.
BASS SPLIT takes the low bass from the center, where it is in many film and
music mixes, and distributes it instead to the left and right front-channels
and the subwoofer. This is valuable because in many video installations the
center speaker is smaller than the two main stereo speakers and is, therefore,
less capable of handling the lowest frequencies.
(dB)
+3.000
0.0
-3.000
-6.000
-9.000
-12.00
-15.00
-18.00
-21.00
-24.00
The AUTO AZIMUTH/BAL parameter should be set to ON for films, OFF
for music. When it is on, special digital circuits continually monitor the
dialog and adjust both the relative level and time offset of the two channels
to keep the dialog properly centered. This automatic feature is why the CP-
1 does not have or need a front-panel input balance control for Dolby
Surround decoding.
REAR DELAY in Stereo Logic is adjustable. Generally, the correct delay is
about 20 milliseconds but the setting depends on speaker set-up and source
material. In general, the delay should not be so great that the rear sound
becomes identifiable as a distinct source.
Dolby Surround decoding specifications call for a special form of Dolby B-
type noise reduction. Because Stereo Logic is also meant for music, the rear-
channel sound has more flexibility, including REAR NOISE CHIP, a pa-
rameter that allows you to turn this Dolby NR circuit off.
The SIDE SPEAKERS control turns the side speaker output on or off,
widening, or reducing the apparent stereo spread.
The procedures for naming a new version of the program (SET PROGRAM
NAME) and storing it in one of the User registers (MEMORIZE PROGRAM)
are described on page 36.
10 100 1k
(Hz)
10k
The Modes:
Music Surround
Bass Split
BASS SPLIT rolls off frequencies at 6dB
per octave. The values given are at the -
3dB point of attenuation from the center
speaker.
Auto Azimuth/
Balance
Rear Delay
Rear Noise Chip
Side Speakers
Set Program Name/
Memorize Program
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