I tried the C1s with a pair of VTL MB-450 tube amps and I really liked the combo. The bass was deep, tight, definitely not lacking, but then again I'm not sure what you're used to. It doesn't have the impact of bigger speakers, but in the medium sized room I listened in I could feel the bass.
I have the same issue as you in that I don't know if the Pass x250.5 (or 350.5) would be a better choice. I liked the VTL, but a lot of people seem to be praising the Pass, which I can't audition.
I have the same issue as you in that I don't know if the Pass x250.5 (or 350.5) would be a better choice. I liked the VTL, but a lot of people seem to be praising the Pass, which I can't audition.