7
The POSITION switch has three settings: 
free, 
wall and 
corner.
free
Use this setting if the loudspeaker is placed more than 15 cm (6") from the wall, and no closer to a corner than 50 cm (20") – shown by the large light grey area in the illustration.
wall
Use this setting if the loudspeaker is placed less than 15 cm (6") from the wall, and no closer to a corner than 50 cm (20") – shown by the grey areas along the walls in the illustration.
If the loudspeaker is mounted on a wall bracket, use this setting.
corner
Use this setting if the loudspeaker is placed in a corner – shown by the dark grey areas in the illustration.
Position zones: The three settings (free, wall and corner) correspond to the position zones marked in different shades of grey.
How to measure? The distances referred to are measured as shown here (the loudspeaker seen from above).