Dyaudio Confidence C4 room size requirement

Hello all, 

I'm interested in getting a pair of Dynaudio Confidence C4 but not sure whether my listening room is big enough for them or not. My room is 14'x20' and the ceiling is about 10' high. Your feedback would be greatly appreciated!  
I used them in a smaller room you have and they sounded great. The only problem you need beefy amps to make them really sing
Thank you very much for the advice! I secured a pair of C4 Platinum about 200 miles away from me. Going to pick them up this weekend. Will be shopping for an amp after that. Amp advice is welcome.