Stereo minijack to mono XLR

[Spino]

I built a few of these passive resistors-only summing cables a long time ago, now I need to build a couple more but I totally forgot. For my remembering it should be something like I've drawn, but I'd love to have the holy opinion (even on the values of the resistors) of groupdiy in case I'm messing up badly. Thanks.

 

[Spino]

See I was going to mess up? Of course the XLR is 1-3 ground and 2 hot.

 

[JohnRoberts]

#2=audio +
#3=audio -
#1=system ground

JR

 

[Spino]

#2=audio +
#3=audio -
#1=system ground

JR

Yeah I obviously missed that badly thanks.
In this case it's going to be unbalanced, so 3 is shorted to ground. Values make sense?