Not sure what you mean by similar power ratings.
8006 spec'd at 70w/ch@8ohms, 100w/ch@4ohms
851A spec'd at 120w/ch@8ohms, 200w/ch@4ohms
Now the CA 651A does have similar specs at 75w/ch@8ohms.
With that said I find CA to be spot on neutral without any coloration, at least with my Klipsch Reference and Heritage speakers. I currently have a CA 640A v2 driving a pair of Heresy IIs in my bedroom.
Bill
8006 spec'd at 70w/ch@8ohms, 100w/ch@4ohms
851A spec'd at 120w/ch@8ohms, 200w/ch@4ohms
Now the CA 651A does have similar specs at 75w/ch@8ohms.
With that said I find CA to be spot on neutral without any coloration, at least with my Klipsch Reference and Heritage speakers. I currently have a CA 640A v2 driving a pair of Heresy IIs in my bedroom.
Bill