From what I read and experienced myself, the implementation of digital volume in RME is excellent, especially in combination with auto-ref which sets the ref-voltage based on volume and sensitivity of amplifier automatically to maximize dynamic range.
Another excellent feature: I often listen when wife is sleeping, so have to listen at low volume. And I absolutely love the configurable loudness function, toggling it on/off at low volume is like going from music over a telephone line to real music.
Here is how it works:
- Set lowest level you listen to music, in my case its -57 dB
- Set modification to bass and treble at this level, I set +8dB on bass and +5dB to treble
- The range of modifications is 20 db, so in this case from -37dB to -57dB
So now when I play at -57dB I get +8dB bass and +5dB treble, and that lowers gradually as I raise volume to -37dB at which point its 0/0. No reason to ever fiddle with it, I leave it on at all time and let it do its magic.
Surprising that not more DAC has this feature, its a total game changer for listening at low volume. But it does require a good display and proper build in DPS, so maybe not so strange.