As others have said, just use the RCA connection. If you ever get a pre with balanced input, you can try using balanced and see if it is an improvement to your ears. (Even if not, you might find, as I do, that XLR connectors are better designed and less likely to come unplugged or cause hum.)
Balanced Streamer/DAC to Unbalanced Preamp
My streamer/DAC (Lumin D2) can output both balanced and unbalanced, preamp (LTA MZ3) is RCA only. Is there anything to be gained sound-wise by using the balanced outputs of the streamer/DAC via a specialized cable or adapter? Or just stick with unbalanced from source to preamp?