Analog Signal Cabling - L-Acoustics LA4X User Manual

3.4.2

Analog SIGNAL cabling

The eight XLR3 connectors of the SIGNAL panel (see Figure 7) are wired according to IEC 268: pin 1= shield,
pin 2= + signal, pin 3= - signal.
The four female XLR3 input connectors ANALOG IN A to ANALOG IN D can receive up to four analog signals (when
setting the analog input mode for channel pairs AB and CD). The headroom of the input circuits is high enough to
accept the maximum output level from virtually any line level signal source (up to 22 dBu).
In a daisy-chain layout, the four male XLR3 link connectors LINK A to LINK D feed the input signals to the next
amplified controller in the signal chain (see Figure 8). Each LINK connector is passively wired in parallel on the
corresponding IN channel. The input impedance is high enough (22 kΩ, balanced) to allow multiple parallel input
connections.
Balanced cables
Symmetrical (balanced) shielded cables are highly recommended as balanced signals are less sensitive to AC hum
and radio interference.
Unbalanced lines may add noise especially over long cable runs.
LA4X_UM_EN_4.0
Figure 8: Daisy-chaining analog audio
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