+1 @soix this was going to be my recommendation as well in addition to utilizing the preouts which had already been suggested by @deep_333.
Many years ago I also had the Polk Rti8s, Rti4s, Csi5 center, and PSW 505. I then purchased the Ascend Sierra -1s (first generation with SEAS tweeter), which steadily took time away from my Polk 5.1 system. The Sierras were not only in a different ballpark, but a different time zone compared to the Rti8s.
I still consider Ascend Acoustics “boutique” in terms of being an almost one-man operation, or perhaps now a family owned operation, which I strongly value.
If I wasn’t regulated to the mains being on the wall by the spouse, I would definitely be eying those Ascend towers and center speaker.
Still regret selling the Sierras - they were phenomenal for the price, while also helping me lean into 2-channel listening.

