As a Dynaudio dealer and owner of the C1's myself, I feel they are more than capable of filling that room. My room is 14'x20'x11'.
I have no real-world experience with your amplifiers, but I highly recommend that you give consideration to giving the C1's a fair amount of power. I'm using the Halo JC1's.
I have no real-world experience with your amplifiers, but I highly recommend that you give consideration to giving the C1's a fair amount of power. I'm using the Halo JC1's.