Len, I stated before that one of the reasons for the purchase of my X260.8's was I felt like I was getting the best of both worlds. A powerful Class A/B amp with large amount of initial bias into Class A. The highest of any Pass amp save the mighty X650.
I started with an XP-10 Pass preamp and the XA 30.8 amp driving my CLX speakers. While I was pretty happy with the sound I felt the XP-10 was a bit “fat” sounding in the bass. Maybe a little too rounded. After exploring the idea of an upgrade to the XP-32, I was persuaded that for the same cost upgrading to the XP-22 preamp and X250.8 amp would be the better move. So far I am happy with the upgrade - it sounds more natural.