I don't know which Bluesound Node 2 generation the OP has, but I can tell you the coax or toslink connections on the previous gen are a limiting factor. When I was using BS with various DACs, I was having a hard time discerning differences between a few DACs I tried. It was only after I moved to a better streamer supporting USB out that I was able to extract more out of my DACs.
I have a Terminator II in my main system and recently bought an Ares II for the home office system. Both took over 100 hours to sound good. When I first got the Ares II, I wasn't sure what the fuss was about. It sounded pretty ordinary. But after two weeks, it came alive. I'm still shocked how well a DAC costing roughly $800 USD can perform. It is certainly better than my Audio Mirror Tubadour III (non-SE version) for sure.