Thiel speakers can be really revealing of the source, maybe more than any speakers I've heard yet. In my system they sounded good with my digital source, but a little like you described with my analog source. Too bright. I think your issue probably has more to do with your speakers and electronics than the Node.
Just got a new Bluesound Node. Very disappointed!
I got the BSN to run to my NAD M51 DAC and everything sound like the treble has been turned up +10db. The bass is also weak. I use Qobuz and Tidal and both sound the exact same way. I can listen to cd’s is my Oppo of the same music with no problem.
what gives, is it really this bad?