Orban Optimod-PC 1101, Operating Manual

Page: 99 / 258

OPTIMOD-PC INSTALLATION
2-43
The D
IALNORM
R
EFERENCE CONTROL
is located in the C
ONFIGURATION
tab of the
I/O mixer .
The controls to which the following procedure refers are described later in Section 3.
A) Make sure that the processor mixer’s output is peaking around –15 dB for
normal program (see
Input Setup Procedure on page 2-35).
B) Make sure that the 1101’s active
D
IALNORM
value is the same as the Dialnorm
value you are transmitting to consumers’ receivers.
For U.S. program providers, this ensures that the 1101-processed trans-
mission will meet the requirements of the CALM Act.
C) If the AGC is turned on in the preset, adjust the
AGC D
RIVE
control so that the
AGC is producing the desired amount of compression. We recommend 10 dB
or less with normal levels.
D) If the AGC’s idle gain (i.e. the gain reduction produced by the AGC when its si-
lence gate is on) is inappropriate, adjust it with the
AGC I
DLE
G
AIN
control.
If you are using a factory processing preset and you have adjusted the in-
put reference level correctly, there is no need to adjust the
AGC D
RIVE
or AGC I
DLE
G
AIN
controls.
E) Adjust the M
ULTIBAND
D
RIVE
or 2-B
AND
D
RIVE
control (depending on whether
the five-band or two-band structure is active) to produce the desired amount
of multiband gain reduction. We recommend about 5 dB for dialog at normal
levels.
F) If you wish to use the CBS Loudness Controller: Set the L
OUDNESS
T
HRESHOLD
control to 0 dB, which matches the CBS Loudness Controller’s threshold to the
8685’s active
D
IALNORM
value. (Starting in software version 3.1, this was
changed from –10 dB to 0 dB to make the setting more intuitive.) Then set the
MB L
IMIT
D
RIVE
control so that the CBS segment of the L
OUDNESS
GR meter
indicates 3 dB of gain reduction with dialog at normal levels. (The CBS Loud-
ness Controller’s gain reduction appears in blue on the
L
OUDNESS
GR meter.)
You should see the L
OUDNESS
L
EVEL
meter peaking around 0 dB when the
L
OUDNESS
GR meter shows that gain reduction is occurring
G) If you wish to use the BS.1770 Safety Limiter: Set the BS.1770 T
HRESHOLD
con-
trol to your preferred level. 0 LK provides the tightest control as indicated on
a BS.1770 meter, but this is likely to cause program material with an usually
low peak to RMS ratio to sound too quiet. Most natural sound is produced
when the
BS.1770 T
HRESHOLD
control is set to +2 LK or higher.
H) If you do not wish to use the Loudness Controller: S et the
L
OUDNESS
T
HRESHOLD
and
BS.1770 L
IMIT
T
HRESHOLD
controls to
O
FF
. Then adjust the
MB
L
IMITER
D
RIVE
control to produce 0 dB peak indications on the CBS loudness
meter with dialog at normal levels.
Presets with the loudness controller off will produce wider source-to-
source loudness variation (as indicated on the L
OUDNESS
L
EVEL
meter) than
presets with the loudness controller on. When the loudness controller is
off, the five-band structure will control loudness better than the two-