Recommendations for high quality Streaming Audio:

I have the original Node 2. I use it to stream Tidal MQA. The dac inside the Node 2 is adequate, but I have found that running it through my Cambridge 851C's DAC sounds much better. 

I ran a CAT6 cable to the Node 2. I then moved my stereo to a different location and had to use the wifi feature of the Node 2. Music was lifeless. I couldn't believe the difference. I then ran a 50' cord across two rooms so it could have a wired connection. The change was immediate. All the warmth, imaging and listening pleasure returned. I now have to tear up walls and the ceiling to run the wire. Deep sigh.

On another note. I was running a AQ Coffee Coax cable from the Node2 into the 851C. I upgraded to the AQ Diamond and the change was there. Just for fun, I used the Doug Schroeder method and used two Y splitters and ran both the Diamond and the Coffee. The music opened up again. I then went back to just the Coffee and the music sounded flatter. 

But if I had to make just one change, hardwire the internet connection.

As I previously stated, Hardwiring makes a huge difference. Last night I just switched routers. My internet speeds are over 100MB most of the time. To check the sound quality between wireless and hardwired, we placed the router 3 feet away from the Node2. I did a quick speed test on the wireless and came up at 110MB so I know it had a good wireless signal. We then proceeded to listen. We then hardwired the Node2 and listened again. The results were immediately noticeable. The wireless connected Tidal MQA sounded much flatter. Much less stage presence. 

We listened to the same song through the Node2 wirelessly and then through my Cambridge 851C CD player, and then finally through the Node2 hardwired. The hardwired Node2 and Tidal MQA was the clear winner. It sounded better than my CD player.