You have many more options now with the Node. The first thing to try is streaming a higher resolution signal than Spotify. Most have a free trial period, and none would be easily accessible without jailbreaking the Fire.
The other is the fact that I consider the Node more of a streamer and less of a DAC, not trying to be elitist here. I am streaming through Transporter to a R2R dac I bought off of MassDrop for $300, and will probably sell my Mytek as it is 90% there and in some ways better.
Unfortunately you have opened a can of worms, because as soon as you "wonder what if", you fall head first down that rabbit hole!! Good luck.
The other is the fact that I consider the Node more of a streamer and less of a DAC, not trying to be elitist here. I am streaming through Transporter to a R2R dac I bought off of MassDrop for $300, and will probably sell my Mytek as it is 90% there and in some ways better.
Unfortunately you have opened a can of worms, because as soon as you "wonder what if", you fall head first down that rabbit hole!! Good luck.