Sorry for this. I'm just trying to find out what would be the better buy. I only know that one is 6.5 and the other 8 inches.
Price wise I can get the Polk new for 113 each, the cs80 second hand for $50 for two.

Not quite sure on specs, and weather worth paying extra for new but smaller speaker
(To either go in wall as rears, or ceiling for Atmos)

Thanks