Orban OPTIMOD-FM 8700, Operating Manual

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OPTIMOD-FM DIGITAL INSTALLATION
2-39
peak limiter sound” via the M
ONITOR
D
RIVE
control. The input/output delay is ap-
proximately 5-10 milliseconds (depending on the setting of AGC C
ROSSOVER
T
YPE
) and should be comfortable for talent. See the discussion in Monitoring on
Loudspeakers and Headphones on page 1-26.
To configure any output for Low-Delay Monitoring:
A) Locate to the
I
NPUT
/
OUTPUT
>
O
UTPUT
1
screen to configure the analog or
AES1
outputs. Locate to the
I
NPUT
/
OUTPUT
> O
UTPUT
2
screen to configure the
AES2
output.
B) Choose O
UT
S
OURCE
> M
ONITOR
.
C) Set the preemphasis control to F
LAT
for the output you are using for monitor-
ing.
If you use the low-delay output to drive both your studio monitor speak-
ers and talent headphones (which may be necessary if your console has
only one monitor input for both), we recommend connecting a loss-of-
carrier alarm to one of the 8700i’s GPI inputs and programming this input
to mute the monitor output in the event that carrier is lost. This simulates
normal “off air” monitor functionality and immediately alerts the staff if
the transmitter goes off the air unexpectedly.
You can program any GPI terminal for Monitor Mute functionality from
S
YSTEM
S
ETUP
> N
ETWORK
/R
EMOTE
1
(the
R
EMOTE
screen). The
O
UT
S
OURCE
parameter located in the I
NPUT
/
OUTPUT
> O
UTPUT
1 screen needs to be set
to M
ONITOR
to make the Monitor Mute feature work.
18. Defeat the final clipper (optional).
If you are using the 8700i to drive a network with protection audio processors
(like Orban’s Optimod-FM 2300 or 5500) at each transmitter, you may wish to de-
feat the 8700i’s final clipper to prevent double clipping, which can unnecessarily
increase distortion on-air. To do this:
A) Put a non-MX preset on air. (Clipper defeat is not supported in MX presets.)
B) Locate to the I
NPUT
/
OUTPUT
> U
TILITIES
screen.
C) Set F
INAL
C
LIP
D
EFEAT
to D
EFEAT
.
This will also defeat the overshoot compensator.
Note that defeating the final clipper and overshoot compensator will in-
crease peak output levels, possibly to the point where the 8700i’s output
amplifier and/or digital output clips. It is wise to customize any presets
you are using by reducing the
F
INAL
C
LIP
D
RIVE
and O
SHOOT
C
OMP
D
RIVE
controls to their minimum values. This will greatly reduce the probability
of inadvertently clipping the 8700i’s output.
Unless defeated, the 8700i’s composite limiter will continue to control the
composite output level. However, you should not use the composite out-
put when the 8700i’s final clipper is defeated because this will remove
the advantages of the distortion cancellation in the 8700i’s final clipper.
(The composite limiter does not cancel distortion.)