Probably not going to do anything. I'm pretty sure that I prefer PCM to DSD. I still really like the Res. Audio Opus 21 I bought, and still have my Rotel RCD-991 (PCM63) and RCD-855 (TDA1541A) if needed. I use the 991 as a transport for the Opus as the shitty DVD drives they used back in the 2000's given most of the good mechs had been disco'd by that time leave a lot to be desired. I can't tell any difference in sound between the internal drive on the Opus vs. the Rotel -> S/PDIF -> Opus.
I did build one of Pedja Rogic's AYA DAC something or other back in the day. @morphsci has that or at least did.