Dolfan, A couple of reasons actually, before I bought it, the reviews that I read said it sounded a little better XLR over RCA. Second, I use the same amp for 2 CH & Home Theater, so for connector ease, I use CD with the XLR inputs, and HT with the RCAs. I would have keep changing the RCAs. Also, now that I have heard the CD2.2 both ways, it's subtle but I think it's a little more dynamic sounding with the XLRs. Sonny