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There are no firm rules regarding placement, as acoustics will vary from room to room. A degree of experimentation is necessary for optimum placement but a starting point of 20-30cm from rear walls is suggested, with a toe-in of 10-15 degrees. Generally, bass output increases as distance from the rear wall, or room corner, decreases. Stereo depth improves as the speaker is brought away from room boundaries. Move the loudspeaker in small increments (2-3 cm at a time) and assess the changes until satisfied with the in-room balance. (Often, very small changes of the loudspeaker position can result in a huge improvement in performance.)