If the component with XLRs is IEC-compliant use pin 2 for all signal wires and send two ground wires each to pins 1/3.
RCA to XLR interconnect wiring diagram
Building my own interconnects and looking for a wiring diagram to go from male RCA to male XLR. I am using non-shielded cable. The wire is Homegrown Audio's SC-8 silver braid which uses 8 strands of silver wire. 4 signal and 4 ground when used for RCA to RCA termination. Thanks, Brian