Non inverting polarity?

A signal with a (half-cycle) pulse of positive (or 'noninverted') polarity creates a positive push of a speaker cone--TOWARDS you, the listener. A negative- (or 'inverted-')polarity signal will cause the speaker cone to pull away from you.

I don't know anything about XLR-terminated interconnect (except I have none).
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If you are worried about inverting polarity in your system, the easiest place to fix it (if your pre doesn't have an invert polarity feature) is by changing your speaker cables... Wire + to - and - to +. Since each two polarity inversions will restore absolute polarity, you just need to correct once. Doing it at your speaker terminals is probably the least intrusive way of fixing the problem.

Then again, most people can't tell the difference. Including recording engineers, who can invert phase on recordings. Search for "woods effect" in the archives.

Jeffreybehr...I just found out that all JBL loudspeaker drivers have polarity opposite to other brands. A positive voltage applied to the + terminal causes the cone to pull in (not push out). So, if you think absolute polarity matters, and you have JBL speakers, hook them up backwards.