Emre, I am currently driving my Amati's with the Pass X-600's and an Audio Research Ref II mk I preamp. I have found the Amati's to like a tube in the signal path, however not so much in the amp, but more so in the Preamp. I tried a pair of Cary V-12i mono's, but they just couldn't bring the speaker to life like the Pass gear does. I hope this helps.
Darrin
Darrin