How to Wire an XLR to a 1/4" Jack - mediacollege XLR to 1/4" Mono Plug. The most comon way to wire a 3-pin XLR to a 1/4 inch (6) mono plug (sometimes called a jack plug), is to join the negative and shield together. This can be done by either soldering the shield and negative wires of the XLR to the sleeve of the plug... Or by soldering a Audio Tutorials · Video Tutorials How do I wire an XLR to 1/4" adapter cable? - shure There are many different configurations that can be made between an XLR to 1/4" adapter. The XLR connector is pretty straight forward. It has 3 wire terminals and is standard. The 1/4" connector, on the other hand, can have 2 or 3 wire terminals and is not standard.