It's quite usual to use balanced at one end and phono-single ended at t'other. My way is to connect screen and negative together at the phono plug and not connect the screen at the XLR end, but this depends where the best earth is, as on the ATC actives, the earth pin (pin 1?) is coupled to chassis ground via a 47 Ohm resistor to prevent hum loops, whereas my preamp has the chassis and screen of the phono plugs coupled together. I believe the convention may be to connect the screen at the male (far) end...
Other equipment has their grounding done differently and I found that each case needs to be looked at carefully, otherwise subtle bits of reverb and atmosphere can be affected.
Apologies if I'm confusing you.
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