Interesting thread as I decided to go with a similar combination.I recently heard the Pass XA 30.5 with the Dynaudio Anniversary 25, which have similar specs to C1s and C2s. They sounded wonderful together. The Pass easily handled the Dynaudios even at loud listening levels. I was so taken by the combination that I ordered the XA 30.5 on the spot to run my Dynaudio Confidence C2 IIs. The dealer assured me the XA 30.5 would be sufficient. I had come into the store inquiring about the X350.5, which is more expensive, but the dealer suggested I give the XA 30.5 a listen first. He obviously could have sold me either. Pass is shipping the amp next week, so I will be able to assess in my own room with the C2s soon, but based on what I heard, I am optimistic that the XA30.5 will be able to handle the Dynaudios.