Hi, While I owned the Bluesound Node 2 (not 2i), I too was interested in comparing the internal DAC with my new Stellar Gain Pre / DAC from PS.
I first used the internal Bluesound DAC, then compared with both Coax and Optical connections into the Stellar Gain. To be clear, I did use cheap RCA connectors for the analoge out of the Node. The difference was impressive, with the Stellar Gain DAC sounding much better. I have since ordered the Direct Stream Junior. Can't believe the 2i will outperform what I heard, and am excited to hear the DSJ. Also the DSJ is Roon / MQA.
I first used the internal Bluesound DAC, then compared with both Coax and Optical connections into the Stellar Gain. To be clear, I did use cheap RCA connectors for the analoge out of the Node. The difference was impressive, with the Stellar Gain DAC sounding much better. I have since ordered the Direct Stream Junior. Can't believe the 2i will outperform what I heard, and am excited to hear the DSJ. Also the DSJ is Roon / MQA.