Need tips to better my sound

The blue sound node seems reasonably priced. Something like a Lumin would be pushing my budget. But I guess that all depends if I get a streamer with a DAC included that will better the parasound Z DAC, and if I need a computer to use a streamer. Mainly I just want to First address the weakest link in my system which I was guessing is using the smart TV's spotify app to stream. But maybe not? I'm pretty clueless. Thanks. 

Sweet!!
 Problem solved thanks guys🙂

You guys rock! Thanks to everybody that responded. I see a recurring theme of suggestions for the next best step to take. High quality streaming with a dedicated streamer. I'm still not sure how or why that dedicated streamer makes a difference (wish I understood that) but I trust that it will. As far as Millercarbon suggestions, I'm sure in a well-established system, tweaks can customize and benefit an individual, but I'm looking to eliminate the weakest link in the chain right now, and as little as I know, I can say with relative confidence that it's not a fuse or power cord. The power cord for my integrated is built in, I don't see any fuse on it externally. My DAC is old enough that technology has probably advanced more than a power cord would change the sound, etc.  So I'll hold off on tweeks till a later time. The only other question that I have at this point would be other streamers to consider besides the bluesound node 2i. My Revel speaker dips down to 4 Ohms so don't need an amp built into the streamer because I'll require a dedicated integrated or amp. And if the streamer I purchase has a DAC, it needs to be better than the parasound Z DAC or I'm paying for a feature I won't use. If it is better than the Parasound ZDAC then I can at least sell my Zdac for a few bucks to offset the cost of upgrading the streamer / DAC combo. Thoughts?

Update:  I just purchased the node 2i, and will order a year of qobuz for $150 within the week.
Can't wait to integrate these two things and see if I still need the Zdac. Next steps of possible improvements will be room treatments (or better yet, improved integrated with room correction like Anthem STR?) Anyway, I get ahead of myself and I'm pretty broke now so that's it for this month's improvements. I'm working overtime in hopes of slowly gaining improvements. I sincerely appreciate all the wonderful input and experience shared on this post (minimal trolls and jackholes). I really hope you same guys are around to help me with the next step.
Thanks go out to soix, fuzztone, gdnrbob, lalitk, highpeakrider, mr_m, larry5729, and the other contributors that shared experience and knowledge.