@chemarcelo
You didn’t state which Bluesound Node you have. Apparently, there have been significant improvements with the model upgrades, and even the original was rated Class B by Stereophile. I have the Node 130 and the Ares II, and I think they sound great. I’ve compared a hi-res Qobuz stream to an original vinyl pressing of the same well-recorded rock album, and heard no differences. (If you look at my system, you’ll see I run vintage Classé Audio electronics into updated Apogee Duetta II speakers--a very transparent, revealing system; and although I’m in my sixties, I am a highly trained listener and have been able to discriminate differences between some cables, especially interconnects, AC cables and speaker cables.)
I would suggest that the DAC upgrade might be worth considering, but certainly you should be sure that other issues like your room acoustics aren’t more significant weak links in your system. Also, the BlueOS app let’s you check how strong your wi-fi signal to the Node is--mine is excellent, and that may make a difference, especially if you’re streaming hi-res. If you’re just streaming CD-quality files or worse, that’s a weak link right there. Basic Amazon sound files may be more the problem than your gear.