I read that both the 39 and Model 1 have a true balanced signal pathImpossible for the 39, look at page 3 pin 11/14 it the only current output, and it’s single ended for one channel to the I/V opamp. Anything after that is going to be "pseudo xlr" made up by another opamp to create it. I would rather no have that in the signal path, so the single ended output should be better.
http://www.lampizator.eu/lampizator/LINKS%20AND%20DOWNLOADS/DATAMINING/1702%20dac.pdf
The M1 Bricasti yes, it's the other way around as it's dac chip has + and - outputs so it's balanced. Trouble is it's Delta Sigma conversion which I feel is not as good as R2R Mulitbit like the 39 for converting PCM Redbook 16/44 and 24/96.
Cheers George