2-30
INSTALLATION ORBAN Model 8400
Analog and Digital I/O Setup
For the following I/O calibration parameters, use the Locate joystick to highlight in-
put/output parameters. When the desired parameter is highlighted, turn the front panel
control knob to adjust the parameter settings, as desired.
Analog and digital parameters appear on the same screen. If you are not using a given
input or output, ignore the parameters associated with it.
1. Temporarily set the studio chassis mode to “No.”
A) Navigate to the Input/Output: Utilities screen and set Studio Chassis to No.
If you are using a studio chassis like the Orban 8200ST, you will restore this
setting to
Yes after the setup procedure is complete.
2. Adjust Input selector.
A) Navigate back to the Input/Output: Input screen.
B) Set the Input to Analog.
The 8400 will automatically switch to analog input if signal lock is unavailable
at the AES/EBU input.
3. Adjust Clip Level control.
[0 dBu to +27 dBu] in 0.5 dB steps
This step matches the level at which the 8400’s A-D (Analog-to-Digital) con-
verter clips to the absolute maximum peak level that your installation supplies
to the 8400’s analog input.
This setup maximizes the 8400’s signal-to-noise ratio. If the clip level is set
too low, the 8400’s analog-to-digital converters will overload and distort on
program peaks. If the clip level is set too high, the signal-to-noise ratio will
suffer. Use care and attention in setting this adjustment.
We have found that the single most common reason for distorted sound on-
air in other Orban digital processors is misadjustment of the
Clip Level con-
trol, such that the A/D converter is clipping and distorting. This will always
be obviously indicated by the
Input meters’ going into the red part of their
scale.
If you are adjusting the 8400 during normal programming, and cannot inter-
rupt or distort the program to play program material from your studio at a
much higher level than normal, follow the directions to:
• Calibrate while on air with normal programming, step (A) on page 2-31.
If you are able to interrupt or distort normal programming, you can achieve
calibration that is more precise. Follow the directions to:
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