How big a room for Dunlavy SC-V?

Thinking of potentially upgrading my speakers from Snell C/V. Dunlavy seems to be a similar design, at least looking at the shape of the box and the driver configurations. I've heard them in the past, and liked the sound. However, that was in a large room at a high end audio shop. I'm concerned I don't have the space to do them justice. The room is about 21 feet long, 12 to 14 feet wide, with two large open doorways I can't do anything about. I sit about 14 feet from the TV and front speakers. Are the Dunlavys just too big for the room? The rest of the sysem is Theta Carmen / IIIA DAC, Adcom GFP-750, Bryston 4B-NRB. It's a combo HT system with a Sunfire processor, more Bryston amps, and Snell speakers all around, with a Rel Storm-III sub. Any suggestions are welcome. Thanks to everyone. -Dave