Converting XLR to Single Ended for inputs

I am considering upgrading my Krell KRC2 to a KCT. The only problem I am having is the KRC2 has plenty of single ended inputs. I have needs for five inputs; Phono, FM, Satelite, Tape & CD player. None of mine have XLR or CAST outputs. I have a couple of Cardas XLR/RCA adapters but have never used them. I always seemed like a band aid fix. Is it OK to use these adapters with no harm or degrading of signal/sound? If so which one should I use the adapter for, or does it matter?
Thanks a lot for any input.
-John