As unpleasant as it sounds, toetapfactor is right about fitting any quality speakers in a square room.
C5 works well close to the back wall, you might want to play with speaker placement more or go as far out as having them firing diagonally. If nothing worked, I do suggest you try Usher BE-718 which is front ported, very detail and sweet, and has very good bass for the size.
C5 works well close to the back wall, you might want to play with speaker placement more or go as far out as having them firing diagonally. If nothing worked, I do suggest you try Usher BE-718 which is front ported, very detail and sweet, and has very good bass for the size.