The node has a pretty good sounding dac, however being that I can’t leave well enough alone, I’ve purchased the mytek liberty which should do the full unfold via toslink or spdif. And yes I’ve replaced the nodes power cord and I have a hardwired Ethernet connection using a fiber optic “ bridge”.By the time you've done all this, you've spent more money than you would on a really good streamer/DAC like the TEAC NT-505 and still don't come close to the sound quality of the TEAC.
Sell the Bluesound, put the $300 or so you get for it towards the NT-505 which is being blown out for $1200 by TEAC right now and for $900 you have a really nice sounding streamer / DAC that will do MQA, DSD, and pretty much anything you want it to, other than it doesn't support as many music services as the Bluesound. The Bluesound interface is really its best feature and hard to beat.
I hate to sound like a fanboy for the TEAC, but after having already gone down this path myself I'd like to help others keep from throwing good money after bad.
The Mytek Liberty is a very "digital" sounding DAC, very analytical. Adding it will sound a little better than the Bluesound on its own, and the little light will come on for MQA, but unless you prefer etched analytical sound over warm yet detailed "analog" like sound, you'll be replacing it before long. Of all the DACs I've owned, the Liberty was my second least favorite.
Anything you do to try to make the Bluesound sound better is a band aid. It's not a bad sounding unit, not by any means. But if you're chasing sound quality, there are much better sounding sources available. All the fancy power cords, cables, and external DACs you slap on it are only going to take it so far. And that won't be as far as replacing the whole shebang with a better streamer/DAC.