AUDIO I/O AND SERIAL PORT WIRING
ENG
Page 32
15 AUDIO I/O AND SERIAL PORT WIRING
Where possible use balanced connections for the audio inputs and outputs to minimise noise pick-up. Avoid
running audio cables near to mains or lighting cables or thyristor dimmer units, power supplies etc. These
may cause audible hum and buzz.
The use of low impedance sources significantly reduces interference pick-up. Check the cables for correct
wiring to avoid problems with phase reversal and unreliable connection.
15.1
ANALOG AUDIO INPUT
The processor features electronically balanced XLR female inputs.
Input
L
R
1
3
2
1
3
2
Pin 1
Gnd
Pin 2
Signal
Pin 3
Return
An hardware bypass directly connect the two input XLRs to the output ones in the
event of power failure or processor switched off.
In case of unbalanced connections, please connect the cold pole (Pin 3) to the ground (Pin 1).
Factory preset input impedance is 10 kOhm. This impedance may also be set to 600Ohm by moving the two
internal jumpers on the analog I/O board (see last chapter on hardware settings).
The input level – factory preset to 0 dB – can be adjusted via menu within the +/- 6 dB range (see chapter
19.2).
We recommend using high quality wires, well protected, and balanced connections to avoid external
disturbances.
Make sure that the earth connection is good and that earth and audio ground are separated.
Attention: while enabled, the digital input excludes the analog one.
NOTE: in the case of connection to MONO sources, we recommend injecting the same signal on both
channels (FM version) or setting the processing mode to mono (ST version).
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