Wiring The Nxa-Avb/Ethernet For Balanced Audio - AMX NXD-1200V Operation/Reference Manual

Touch Panel Accessories
GND
IN-
IN+
GND
IN-
IN+
AUDIO IN
MIC OUT
GND
OUT-
OUT+
FIG. 7 Wiring the rear AUDIO IN and MIC OUT for use with Unbalanced Audio
When using unbalanced audio for the AUDIO IN connector (FIG. 7), the "-" and the "GND" terminals should be
connected together and then connected to the GND of the unbalance audio signal. When connecting to an unbalanced
audio input from the MIC OUT connector (FIG. 7), wire the "+" terminal to the signal input, and the "GND" terminal to
the signal ground.

Wiring the NXA-AVB/ETHERNET for Balanced Audio

Professional audio equipment will often use balanced audio inputs and outputs, usually on 3-pin "XLR" connectors. A
balanced audio signal consists of a pair of wires carrying the audio signal in anti-phase with each other (if one wire
carries a positive voltage, the other carries an equal and opposite negative voltage).
The advantage of balanced audio over unbalanced audio is its ability to reject external interference added as the signal is
carried over the wire. The receiving equipment takes the voltage difference between the two wires as the input signal.
Interference will usually get added to both wires equally, and so gets cancelled by the receiving equipment.
The 3 wires used in a typical XLR lead are often referred to as Ground, Live (Hot) and Return (Cold). "Live" and
"Return" carry the "in-phase" and "out-of-phase" versions of the audio respectively. The pins of the XLR plug/socket are
as follows:
• X = Ground
• L = Live (Hot)
• R = Return (Cold)
When connecting the MIC OUT connector to a balanced audio input (FIG. 8), use all three audio terminals (+, -, and
GND), then connect the "+" terminal to the "live" signal, the "-" terminal to the "return" signal, and the "GND" terminal
to the ground signal.
GND
OUT-
OUT+
FIG. 8 Wiring the rear MIC OUT connector for use with Balanced Audio
8
Unbalanced IN
Left Channel
(Jumper IN- to GND)
Unbalanced IN
Right Channel
(Jumper IN- to GND)
Unbalanced OUT
Microphone
Ground signal
Return signal
Balanced OUT
Line signal
NXD/T-1200V Wall/Flush Mount Touch Panel