The olive has seperate analog RCA L & R outputs and also seperate pure digital outputs using optical and coaxial connections. A new Opus 4 is coming out. The old Opus 3 and Musica had a decent dac in them and the benefit of being able to back up your music on a hard drive.
Most DACS can be used with it. Just be sure the DAC handles the format that you put on the disk, as the output is pure digital and not converted back from how it is stored.