XLRs are quieter and certain products are at their very best when part of fully balanced systems. The Lumin X1 May be one of those. I would talk to the importer for Lumin and get his POV.
Some dacs and/or servers optimize balanced output. While single ended only may be ok in short run, what if you change out equipment, I want both SE and balanced ins on my pre. And then there is issue of pre being true balanced design, preferable to SE IMO.
I would use xlr if possible, especially if the manufacturer says so. Maybe not a big deal - it depends - but in my experience, balanced usually sounds better.
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