Orban OPTIMOD 8400 - Page 68

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INSTALLATION ORBAN Model 8400
f) Adjust the Digital Input Reference so that the meter reads an average of 10 dB
gain reduction.
[−30 to –10 dBFS (VU), or –22 to –2 dBFS (PPM)] in 0.5 dB steps.]
The
Digital Reference Level VU and PPM settings track each other with an
offset of 8 dB. This compensates for the typical indications with program
material of a VU meter versus the higher indications on a PPM.
If you know the reference VU or PPM level that will be presented to the
8400, set the
Digital Reference Level to this level, but do verify it with the
steps shown directly below.
If the
AGC gain reduction meter averages less than 10 dB gain reduction
(higher on the meter), re-adjust the
Digital Reference Level to a lower level.
If the
AGC gain reduction meter averages more gain reduction (lower on the
meter), re-adjust the
Digital Reference Level to a higher level.
This control has no effect on the analog inputs.
B)
Select primary Input Source
a) Switch the input to the source (analog or digital) that you will use for normal
programming.
8. Configure Output.
A) Locate to the Output Configuration screen (System Setup: Quick Setup 6).
B) Set the Analog Output Pre/Flat control to Pre-E (for pre-emphasis) or Flat.
[Skip this step if you will not be using the analog output.]
If you will use the analog output to drive a stereo encoder,
Pre-E provides
the best performance because this stereo encoder does not have to restore the
pre-emphasis. However, if you cannot defeat the pre-emphasis in your stereo
encoder, or if you will use the analog output for monitoring, set the output
Flat.
If you are sending the analog output of the 8400 through a digital link that
uses lossy compression (like MPEG, APT-X, or Dolby), set the output
Flat.
Lossy codecs cannot handle pre-emphasized signals.
C)
Set the Digital Output Pre/Flat control to Pre-E (for pre-emphasis) or Flat.
[Skip this step if you will not be using the digital output.]
(See the notes immediately above.)
D)
Set the Digital Output Sample Rate to 32, 44.1, or 48 kHz.
[Skip this step if you will not be using the digital output.]
The 8400’s fundamental sample rate is always 32 kHz, but the internal sam-
ple rate converter sets the rate at the 8400’s digital output. This adjustment
sets the output sample rate to ensure compatibility with equipment requiring
a fixed sample rate.
E)
Choose the function of the Composite 2 Output.