Oppo 205 and external DAC?

I just added an MHDT Stockholm v2 DAC to the Oppo 203:  Do I need to change any settings on the Oppo to bypass the internal DAC on the Oppo to go through the MHDT DAC?

The 205 has a great DAC. Send the unit to Modwright for the tube mods to improve the output stage and you’re set.

Oppo 205 XLR line out is good enough. if you just need listen  to streaming music using Tidal or Qobuz, get a Mac Mini M1 and Topping D90 DAC. 

ASR compared the analog outputs of the 205 found the differences between RCA and XLR negligible, except for voltage output of course. If using the 205 direct to amp, in most cases (depending on the amp) the RCA outputs might provide greater range of volume control with less potential for bit stripping. The XLR outputs should be less noisier, probably more of a concern if using long interconnects.

How do u connect oppo 205 to external Dac ? If u use Mac Air as a source?
Mac Air to usb input then coaxial output to external Dac ? I do t get any sound. 
Thanks