I think you would be happier with the X600s. I am a Pass dealer and I would be glad to talk to you about it.
Pass Labs X-600's vs. XA-160's
I recently purchased a pair of Dali Euphonia MS5's. Sensitivity is 89db. I know these amps are of different power ratings and class, but does anybody have any experience with either or both of them. Which would be better suited for these speakers. I am also considering the Electrocompaniet Nemo monoblocks. I use a Pass X-1 pre-amp. I listen to classic rock, jazz, and classical music.