Interesting topic. I own Dynaudios (not C1s) and other make speakers and run them concurrently of the same source system in different rooms, so I have taken some notice of how my Dyns do voices compared to others.
What's feeding the Dyn's? SOurce, preamp, amp, ICs? These can all make a difference. What other speakers you have heard better voices on aare you comparing the Dyns to?
What's feeding the Dyn's? SOurce, preamp, amp, ICs? These can all make a difference. What other speakers you have heard better voices on aare you comparing the Dyns to?