Try over in the cables forum...
I have Classe prepro and amps, and I heard essentially no difference between reasonably equal RCA and XLR - until the amp moved 25 feet away to the front of the room, between the speakers. I have Cardas interconnects, rather than Nordost.
My best guess its that short-run XLRs of similar quality to your Nordosts would sound about the same, especially given the Ref50.
I have Classe prepro and amps, and I heard essentially no difference between reasonably equal RCA and XLR - until the amp moved 25 feet away to the front of the room, between the speakers. I have Cardas interconnects, rather than Nordost.
My best guess its that short-run XLRs of similar quality to your Nordosts would sound about the same, especially given the Ref50.