Audioman58,
I don't know how you found a thread that seemingly died 6 years ago, but I am glad you brought it back from the dead.
I own the XPs (not XPS) and also a center. These speakers have never sounded as good in my system as the guy I brought them from. They have always sounded a little too hot for me and bass-shy.
That being said, I am guessing those short-comings have more to do with synergy, or lack thereof in my system, than with the speakers themselves.
I am currently using a Butler amp (5150) but I think I need to go solid state with these and also high-current. I definitely did not think things through when I purchased the speakers. They have been a mismatch for my room and the equipment I used. I mean, they were $15K retail at the time I bought them and I am certain I have never give them a chance with the equipment I bought (could afford).
I am going to try them in a different configuration in the room (along the short wall) and also move them downstairs to a room much larger in size. So, suggestions for amps? I am considering Class D such as Hypex Ncore. As much as I would like to try Pass, or even PBN's own amps - they are just too far out of my budget range, even used.