I agree with Amater -- you don't need a big room for these speakers. The C1s will sound best when placed away from side and back walls, but so will every other ported speaker. And yet most people seem to put their speakers right against the wall behind them, in the corners and with a big audio rack in between.
My room is 22' x 14' x 8', so I can bring my C1s out into the room where they sound best (about 3' from side walls, 4' from rear wall and 9' from listener). But I had them in a smaller room before and they sounded great there too.
My room is 22' x 14' x 8', so I can bring my C1s out into the room where they sound best (about 3' from side walls, 4' from rear wall and 9' from listener). But I had them in a smaller room before and they sounded great there too.