I had earlier polk rti a7 driven by Marantz 7025 power amp from using marantz 6011 preouts.I have used the RTiA speakers with a Marantz, it pairs quite well......
You audition the RTiA series speakers at ProFx........it would be possibly paired with Denon AVRs......
https://www.profx.com/product_categ...ti-series&really_curr_tax=48-product_category
For subs ...they have the DSW Pro 550 / 660......also Look at the HTS 10 and HTS 12........
https://www.profx.com/product_category/powered-subwoofers/
I had never found sound to be open.
Always felt that sound is somewhat restricted and constrained.
Upgraded my sub to Svs pb 2000 from polk dswpro 660. But not much difference.
Speakers bi-wired by chord clear way cable.
Now i changed my LCR to Fyne audio 501 and fyne 500c.
The sound quality is now much better, open very musical equally good for movies.
Imaging is excellent.
Polk goes very with denon for movies