Apologies if this has been posted previously but I couldn't find it.
I needed to cross-check a wiring diagram for a stereo jack to a pair of XLR mono's earlier, and came across this excellent guide (with brilliant diagrams) for all kinds of audio interconnects from those nice folks at Rane.
http://www.rane.com/note110.html
https://www.ranecommercial.com/kb_ar...p?article=2107