Craig, how long are your runs ... can’t imagine XLR vs RCA would be noticeable unless you have grounding issues or some EMI source near by. I’m assuming with the 7703 (think that is what you have).

Now on the XMC ... I know Emotive’s claim to fame is a full differential path which might be better but in complete silence I have to put my ear with in inches of the speaker to hear the noise floor (and that’s with a 2nd rate amp) ... when the music is playing and I’m sitting 8 feet away I can’t imagine it would make a difference ...