I used to use JBL L100-T speakers that inverted phase, so I always connected them reverse polarity from the amp and they sounded best that way.

More recently, I've been playing with Tellurium Q cables. Their primary goal is to make cables which preserve phase coherence across the audio band. My findings are ongoing and I am awaiting delivery of their Ultra Black speaker cables for evaluation, but so far their claims are upheld as the XLR cables are very good indeed.