RCA to XLR trouble

[rcstevensonaz]

Then Wiki needs to read Audio Engineering Society Standard AES48, or some of Bill Whitlock's papers.
But then 'chassis ground' is not 'circuit ground'.

But should Pin 1 be connected to the XLR connector's metal tab for an Unbalanced to Balanced cable (as shown in that diagram)?

 

[Speedskater]

For a pro audio portable extension interconnect cable, no. (AES 54)
But for a component to component interconnect, sure in can be and it will give slightly better shielding.