AMX Modero NXD-700Vi Operation/Reference Manual page 22

When connecting the MIC OUT connector to a balanced audio input (FIG. 9), 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.
Ground signal
GND
Return signal
Balanced OUT
OUT-
Line signal
OUT+
FIG. 9