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.