Both responses are correct. One could shut off the other-usually the XLR will shut down the RCA. (Levinson) and two signals in by accident which will happen is not good and could cause permanent damage to the amp and/or speakers. Get a preamp with CD direct if you think a more direct connection is better.
Problems using both XLR and RCA inputs?
I want to add a CD player (RA CD-55) and run it directly to my amp (Aragon 8008BB) but I have an EAD pre/pro occupying the RCA inputs on my amp. My amp also has XLR inputs. Would it be a problem to run both the pre/pro to the RCA inputs and the CDP to the XLR inputs at the same time. I'm sure I would need to make sure both are not on at the same time but wonder if anyone else does this. Marc