I would like to carry 3x balanced line level (not mic level) signals to another part of my living room and I found that the cable space in the skirting boards would not allow 3x balanced cables (XLR connectors at the ends).
I think I can safely carry the (analog) signals using an unmodified Cat5 cable using custom converters at the ends, each twisted pair of the cable carrying a balanced signal.
How should I handle the remaining twisted pair? I think I don't have high frequency interferences in the room, but I want to ensure the best protection against ground loops and 50 Hz interferences.
Should I use both wires for signal ground and ignore the shielding of the XLR connectors? this would allow me to use cheaper plastic XLR connectors. Should I rather use one wire for the shield (connected to the metallic XLR connectors, at one side only of the cable) and one wire for signal ground? Or should I use a STP Cat5 and use both wires for signal ground, and connect the cable shield to the metallic XLR connectors at one side only?
I guess that stranded vs solid copper wires make no difference.
Related but not same: Analog Audio Signal over dedicated Ethernet/Twisted Pair Cable
Edit: it is worth mentioning that the source device is the same one for all 3x signals, therefore the signal ground of the sources is actually the same.