Balanced vs unbalanced

I have recently purchased a fully balanced pre and am looking for a balanced power to partner. The question though is what is the difference between connecting the two by balanced XLRs or non balanced RCA?  Should they sound different?  I appreciate it is what sounds right to me that counts but just wondered where the differences lie between the two and whether the same applies when connecting a source to the pre. I have an Emotiva XPA-2 which has been in storage for about two years and which I was going to get around to selling, which I may drag out now and try as this is a balanced power amp. Advice welcome please.


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