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Figure 4. RCA unbalanced line to XLR balanced line wiring diagram
Figure 5. High level amplifier output to XLR balanced line input wiring diagram
NOTE: For 100 W amplifiers, double the resistor wattage values shown in the diagram
made otherwise there could be a loss of input signal level (e.g. XLR pin 3 left floating will result in a
thin and weak sound) or induced hum (e.g. chassis ground and audio ground connected together)
due to ground loops. Note: do not connect the XLR chassis to XLR pin 1, as this will compromise
the RF immunity of the loudspeaker's electronics. It is preferable to make the pin 3 to pin 1 con-
nection at the RCA end so that noise immunity is maximized. Use the wiring conventions shown in
Figure 4.
It is possible to find pre-made RCA-XLR cables but be sure to identify if the tip of the RCA end is
connected to pin 2 at the XLR end and that pin 3 is connected to pin 1. Some cables are wired dif-
ferently: the RCA tip is connected to XLR pin 3. Although both types work, mixing them in an instal-
lation will cause some loudspeakers to be out of phase compared to others. The logical choice is to
select the type where the RCA tip is connected to XLR pin 2 as this wiring configuration does not
invert the phase. This is then compatible with conventional XLR-XLR connections. Also, the XLR
chassis to XLR pin 1 connection should be checked to see that it has not be made.
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