Dear Alan,
I took a look at your beautiful set. I see you already use the XP-20. ( I have owned this one for 2 years) Why are you still using the older X-250. Because I think it was one of the weakest parts in your system. I had this one for over 2 months for a lend period. It was not a great amp. The later 0.5 series are so much better. Do yourself a favorite, and buy a 0.5 amp. It will bring your set to a much higher level. I promiss!!!