Most speakers can be made to image quite well--it is mostly a matter of placement of the speaker in the room and the placement of the listener in the space. I've heard truly massive horn systems image beautifully, even in surprisingly small rooms, because someone did a great job of setting them up. Giant horn systems may not be ideal for the "disappearing act" that is so prized, but, they can get the scale of the music to be large and realistic (with tiny monitors, even if they can fill the space, you don't get the sense that the music is coming from sources of the right size). The directivity of horns can also help to minimize the effects of reflections from nearby walls and that can help with imaging too.