Ok. I understand. So the key difference is that you're NOT connecting phantom 0V to the chassis bolt at the supply like HT. You're running phantom 0V out to the XLR pin 1s directly. And I guess you have a bit of buss wire touching each of multiple pin 1's or is phantom 0V and chassis connected in the backplane?No, I DO connect pin 1 directly to the chassis. I also connect the phantom 0V to pin1 (not to the analogue 0V).
Attached is my approach documented.
Are you not concerned with RF being radiated into the enclosure on that phantom 0V line? I must admit RF is not my wheelhouse but even with pin 1 connected to the chassis at entry, that phantom 0V is still potentially an antenna. No?