Can this be done using a balun (Or vice versa - unbalanced headphones with a balanced amp) ? If so, what would be the downside, compared to just having an unbalanced setup to begin with? Is this essentially what the re-zero trs adapter does?

long time lurker's first post:   hi head-fi!   the title is the question.  i am somewhat new to the headphone world, and it came as the result of getting married and having to share my space with someone who doesn't like loud noise.   most of my music now-a-days is digital; i use...