Because it is in the specs. And I do like the sound signature when hqplayer does the upsampling work instead of dac internal filters.
Adi-2 with 4493 have the potential to do DSD512, BUT RME didn’t put it in specs. My old dac 2014 N-70A spec DSD 128,but it can play DSD 256 flawlessly. SMSL need...