XLR to 1/4" Mono Jack

The most comon way to wire a 3-pin XLR to a 1/4 inch mono jack (or 6.5mm jack), is to join the -ve and shield together.

This can be done by either soldering the shield and -ve wires to the sleeve of the jack......

Or by soldering a jumper on the XLR.....

Either way gives you the same result: An unbalanced audio cable.