I have heard (purple monkey dishwasher) kidding aside that they really are not a true balanced system anyhow. XLR I think is really over rated, I could be wrong but if you dont have noise coming through then how much quieter can it get? I dont know I have mixed and matched found no difference saved the money and stayed with RCA'S. Peter explained once how XLR and RCA worked and said there is no advantage to XLR.
Parasound JC2 Pre/Parasound A21 Power
Cyrus 8SE/PSX
Rega P5/Moon LP3 Phono Dynavector Karot
Cardas golden cross/reference
Proac D28's