New ELX Ribbons - Phase error?

[malaplace]

Hello all. I am working through the weekend to dial in and calibrate the new ELX speakers (which are beautiful by the way). After I performed sub calibration, I re-ran Audyssey for the mains. Audyssey xt32 tells me there is a phase error. I've checked my wiring and things are positive / negative to the receiver in the way setup as I had with the Towers just replaced. Could this be due to the new crossover design? I can't fathom the terminals were reversed when they were built, but I suppose it is a possibility? Should I try reversing the positive/negative just to check? If it matters, with my ear to the tweeters, I notice a slight bit of a hiss or buzz when no sound is playing through them. This could also be noise in my system, but I have not heard this with the original towers I just replaced. Open to ideas!