What does the amp's manual say? Is there complete switching between its two inputs? If not, one will shunt the other even if only one source is on.
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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.