Are you confusing the difference between the single-ended DAC output and single-ended output in a balanced amp? I agree you shouldn't be throwing away power from a balanced amp when most headphones only need their cables re-terminated to take advantage of balanced mode. In head to head comparisons with balanced DACs, the Concero is every bit as good. Not sure why you think the Gungnir is overrated, it holds its own against much more expensive DACs, has a good feature set, and a nice build quality. Anyway, enjoy your new DAC.
Im not confusing anything. I feel the balanced opens up my planars and makes them sound much better than they do in SE. As to the Gungnr, I had a hard time dstinguishing between the Gung and the Bifrost(which I did own). Alot of dacs hold their own against much more expensive dacs.ex. the Hegel
I'd be really surprised if there would be much difference in perceived sound quality between balanced and unbalanced from DAC to amp where the amp is fully balanced internally and outputting via XLR to headphones in both cases. I'd echo the previous question...are you really talking about balanced v SE dac, or balanced v SE amp? The latter I think is far more likely to show audible benefits running balanced.