Hegel H90 external DAC setup

Thanks, turnbowm. 
Let me add to the complexity... if I’m using the network function to stream over airplay,  Hegel is telling me that the analog in of the external DAC isn’t used. 
I just bought a Bluesound Node 2i, that DAC is inferior to the H90 to my ears, but I’m thinking I can route the external DAC into the Bluesound through an optical connection and then back into the Hegel through coax. This Musical Fidelity MX-DAC has balanced and rca outs, coax and optical ins. Seems like the Bluesound and the external DAC need to talk to each other directly, not both separately connected to Hegel...I think...

just picked up a Bluesound Node 2i, but not sure if I can connect an external DAC to this since it only has outputs. I imagine that analog out on the DAC to analog out on the streamer won’t work.

You got some bad advice. The Node2i is the source and plugs into the DAC. Use Bluesound S/PDIF coax out or Toslink to the DAC digital input.
Then Dac RCA analogue out to an analogue input on the Hegel amp.

Thanks, all good here now! Appreciate the help, all

Just move the SPDIF between external and onboard to compare the sound.

Ok, was able to set this up the other day. Using coax out of the Bluesound to the coax in of the MX-DAC and then analog out from the DAC to the Hegel. 
Sound is...ok. Hegel is louder at a volume match. I imagine due to the internal streamer of the integrated only going through one set of cable vs 3 for the Node 2i. 
I ordered 2 audioquest cables - 1 coax, 1 rca to try and reduce that issue. Instruments seem tighter on with the MX-DAC, greater clarity to instruments and separation, so hoping a couple of quality cables can assist with this further.