I agree with Herman. If you have a Node 2i, then you are limited to coax or optical. No USB.
I have always had better results with coax in most applications over optical. My Node is no exception. Per the review of the Node 2i by Audio Science Review, the SINAD is better with coax than optical, but that could have been an issue with the sample reviewed.
I have a Node 2i connected to a Denafrips Terminator via coax. Much better results than the internal Node DAC. In addition, I found that feeding the Node with an UpTone etherRegen added clarity and more soundstage depth. Sadly though, it still does not compare with the sound quality of my Oppo 105. I think there is limitations to the Node as a streaming device.
I have always had better results with coax in most applications over optical. My Node is no exception. Per the review of the Node 2i by Audio Science Review, the SINAD is better with coax than optical, but that could have been an issue with the sample reviewed.
I have a Node 2i connected to a Denafrips Terminator via coax. Much better results than the internal Node DAC. In addition, I found that feeding the Node with an UpTone etherRegen added clarity and more soundstage depth. Sadly though, it still does not compare with the sound quality of my Oppo 105. I think there is limitations to the Node as a streaming device.