You can lead the horse to water but not make it drink...
Polks are nice, they tend to be on the more Damped midrange and tweet side, so they can take a healthier dose of a Brighter more Brittle sounding amp like a Crown in comparison to some more revealing speakers... DENON is one of the best matches around for Polk on the lower level, this is documented well. Onkyo is decent, maybe get a crown for the bottom end and BIAMP with the onkyo on the top, I believe those polks you have are Biwired with 4 binding posts on the back. However beyond that I agree with above that a crown amp is designed for absolute abuse and reliability on stage, and best used at home for subwoofer applications, They DO Pop LOUD when turned on and off, unless a Soft circuit is installed, and they Hum, hiss, and Crackle quite a bit for most consumer home settings, not to mention absolute annoying Fan noise.
Polks are nice, they tend to be on the more Damped midrange and tweet side, so they can take a healthier dose of a Brighter more Brittle sounding amp like a Crown in comparison to some more revealing speakers... DENON is one of the best matches around for Polk on the lower level, this is documented well. Onkyo is decent, maybe get a crown for the bottom end and BIAMP with the onkyo on the top, I believe those polks you have are Biwired with 4 binding posts on the back. However beyond that I agree with above that a crown amp is designed for absolute abuse and reliability on stage, and best used at home for subwoofer applications, They DO Pop LOUD when turned on and off, unless a Soft circuit is installed, and they Hum, hiss, and Crackle quite a bit for most consumer home settings, not to mention absolute annoying Fan noise.