@suboost I think what @mceljo and I are saying is you'd be better off with an upgrade of some other components with Aria vs. going Kanta and staying with what you have. Looking at your room Kanta will be huge and stick out a bunch, definitely not WAF friendly if that's an issue.
I think you answered my specific question but let me share where I was headed. You have "everything into the Marantz" so I'm deducing that's an AVR and the Parasound is simply a power amp. Ideally what @mceljo and are saying is dedicated integrated amp will have a much better preamp section (make your source material sound better). And it's easlly assembled via the HT bypass function he referenced. Again without knowing all other components my gut says Aria + some other tweaks are likely to yield a better overall result.