If anyone is looking for a good XLR to RCA adaptor for use with the ZTPRE and doesn't cost an arm and a leg, I tried a few and settled on this one:

CF-601-RCA

They are either made by Acrolink or Furutech. Rhodium over silver plated tellurium copper connectors, carbon fiber housing, silver solder and internal connection. The XLR male and female versions of these are used on the EXPENSIVE VooDoo Cable interconnects I use and love the sound of so I tried them out as adaptors, and they definitely sound superior to other cheaper options, no complaint about the sound at all. I got mine from ebay and there are other sources, seem to go for about 50 dollars a pair. Worth it imo.

I sent a pair of these RCA to XLR to Steve to experiment with. If he lets me know how these shape up in comparison to others I'll post that info here. I expect they will fare favorably.