Unless your system is absolute phase consistent from input to output, you shouldn't be concerned about the swapping of pins on the XLR connector. If you preamp or digital components has a phase switch, you could experiment to see if there is a discernable difference between settings. Any given component may or maynot maintain absolute phase. You really have to dig the information out of the manufacturers. A few weeks ago there was a post on the effects of phase. I suggest you search and read.
