Since sound from the speaker radiates around the edges of the speaker then you inevitably get edge diffraction which interferes with imaging.
There are two ways to deal with this:
1) Small narrow baffle so that the edge diffraction occurs very early in time and does not interfere with our ability to determine the precise source of the sound. A small box like a Bose Acoustimass achieves this and so do triangular and narrow baffle speakers to a lesser degree. Generally most speakers do not image well at certain frequencies due to the interference of the baffle dimensions.
2) Infinite baffle. This requires building the speakers into a wall or technically a "half space solution". In this case there is no longer an edge diffraction problem and the imaging should be unimpeded or as good as theoretically possible. (Of course an infinte wall is impossible so ultimately the imaging may be impeded by the side walls, ceiling and floor - in practice if you can keep about 4 feet away from the walls then imaging will be about as good as it gets)
There are two ways to deal with this:
1) Small narrow baffle so that the edge diffraction occurs very early in time and does not interfere with our ability to determine the precise source of the sound. A small box like a Bose Acoustimass achieves this and so do triangular and narrow baffle speakers to a lesser degree. Generally most speakers do not image well at certain frequencies due to the interference of the baffle dimensions.
2) Infinite baffle. This requires building the speakers into a wall or technically a "half space solution". In this case there is no longer an edge diffraction problem and the imaging should be unimpeded or as good as theoretically possible. (Of course an infinte wall is impossible so ultimately the imaging may be impeded by the side walls, ceiling and floor - in practice if you can keep about 4 feet away from the walls then imaging will be about as good as it gets)