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2-10
INSTALLATION
AES/EBU Digital Input and Output
There are two AES/EBU inputs and one AES/EBU output. One input accepts program
audio; the other accepts house sync. The program input and output are both equipped
with sample rate converters and can operate at 32, 44.1, and 48kHz.
Per the AES/EBU standard, each digital input or output line carries both the
left and right stereo channels.
The digital input clip level is fixed at 0dB relative to the maximum digital
word. The maximum digital input will make the 6200 input meters display
0dB. The reference level is adjustable using the DI REF VU and DI REF
PPM level controls.
Best peak control will occur if the output is run at 48kHz. See page 1-8 for a
discussion.
Grounding
Very often, grounding is approached in a "hit or miss" manner. But with care it is possi-
ble to wire an audio studio so that it provides maximum protection from power faults
and is free from ground loops (which induce hum and can cause oscillation).
In an ideal system:
•
All units in the system should have balanced inputs. In a modern system with low
output impedances and high input impedances, a balanced input will provide com-
mon-mode rejection and prevent ground loops — regardless of whether it is driven
from a balanced or unbalanced source.
•
The 6200 has balanced inputs.
•
All equipment circuit grounds must be connected to each other; all equipment chas-
sis grounds must be connected together.
•
In a low RF field, cable shields should be connected at one end only — preferably
the source (output) end.
•
In a high RF field, audio cable shields should be connected to a solid earth ground at
both ends to achieve best shielding against RFI.
•
Whenever coaxial cable is used, shields are automatically grounded at both ends
through the terminating BNC connectors.
ORBAN Model 6200
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