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USER’S MANUAL
The analog audio inputs have the following characteristics:
•
Active balanced
•
Line level: A menu selection Level In, in the AUDIO menu, allows selection
for Consumer or Pro levels. The nominal input level is jumper settable on
the audio board (See section 12.1) to allow the following nominal levels:
JUMPER SETTING
Menu Setting:
Menu Setting:
(JP5&6)
Professional
Consumer
*Right Pins
+4 dBu nom. (+22 clip)
- 11 dBu nom. (+7 clip)
Left Pins
0 dBu nom. (+18 clip)
- 15 dBu nom. (+3 clip)
* Factory default setting
•
Headroom: 18dB above nominal
•
Bridging ≥ 10 K ohm impedance
An analog soft clipper is included to allow maximum dynamic range, while still
protecting the user from over loading the A/D converter if input signal exceed these
values.
The inputs are designed to be sourced from balanced, line level, signals. Older
equipment, with a transformer output stage, may need a terminating resistor
(usually 600 ohms) across pins 2 and 3, consult the manual for your equipment for
how to use it with high impedance inputs.
Unbalanced sources may be used by connecting pins 1 & 3 to the source ground
while the signal high is connected to pin 2. Inserting an unbalanced (2 conductor)
1/4" connector will automatically make the right connections.
HOT TIP!
Xstreams with Stereo Audio boards prior to Rev G (1401- 0000- 007) can handle
unbalanced signals at - 10dBu or - 15dBu only (see jumper settings, above).
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The Level In selection in the AUDIO menu should be set to PRO in this case. The Gain
Trim selection in the AUDIO menu should be increased until proper levels are
observed on the Send meters.
Later version mother boards allow - 10/15dBu (Consumer setting) or 0/+4dBu (Pro
setting)
HOT TIP!
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The signal fed to these inputs should normally be a mix- minus or those monitoring
from the far end will here a delayed version of their own audio coming back to them
(i.e. an echo).
See section 9.3 for details on dealing with delay and mix- minus.
Section 3 GUIDED TOUR of the HARDWARE