First, Keep volume control on tv where it is and let superior controls on your Moon Audio unit handle this, as well as the DA conversion. To that point, it is Very unlikely that the DAC on a Node will be even as good as your Moon Audio's.
To optimize audio out from video streams to TV, suggest HDMI to Moon DAC/amp if connector is available, otherwise TOSLink out instead (opto-isolated and supports 24/192).
For streaming/serving audio, You'll very likely notice a big improvement with a dedicated server/streamer, over current setup. I think the Node allows you to bypass its own DAC and send digital stream directly to your Moon DAC. Might be a good option if used this way.
Good luck.