Check the specs on the Lumin D2 and make sure the output impedance is the same from the XLR and RCA outs. If there is a difference then that could mean using the RCA outs limit the DAC’s potential.
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?