Again I haven’t seen all the 3400 specs,but I definitely know my 2170 will accept any digital format that I’ve feed it.
Most definitely will accept and respond to the sound of Dsd512 and or 32/384 pcm that’s upsampled with HQ player.I upsample all my Redbook and or Tidal to 32/384 and have also used Dsd,but I like pcm better.
Roon as a player has a long way to go to catch up with HQ players upsampling,filtering and noise shaping features.
If you are thinking about Dsd 512 upsampling and some of the advanced filtering your going to need some serious computer horsepower.
I only use Roon as my library interface,music database and Tidal streaming integration,works flawlessly.
Kenny.