Here you go, quoted from the manufacturer.
Anthony Gallo
Depending on décor considerations you may wish to position your Nucleus Reference3’s within a just a few inches of the wall behind them, but the sound will be more "open" when the speakers are 12 to 36 inches out into the room. The Nucleus Reference3’s can fire straight ahead, OR angled in, towards the listening position. Stereo imaging will be more specific when angled in, and upper bass will be more prominent and "faster sounding.
Focal
The loudspeakers should be positioned symmetrically, facing the listening area, ideally forming an equilateral triangle with it. It is, however, possible to change these distances to reach the ideal compromise for any particular conditions (fig. C). The loudspeakers should be positioned at the same height, in the same horizontal plane. Ideally, the tweeter should be positioned at the same height as the listener's ear when listening normally (fig. D).
Do not position your loudspeakers too close to a corner of the room and do not place them too close to a wall. If they are positioned close to a wall or a corner this has the effect of exciting certain resonances within the room and artificially increasing the bass. Conversely, if the bass level is judged to be insufficient, you could try moving the loudspeakers nearer a wall to re-balance the bass level (fig. E).
Anthony Gallo
Depending on décor considerations you may wish to position your Nucleus Reference3’s within a just a few inches of the wall behind them, but the sound will be more "open" when the speakers are 12 to 36 inches out into the room. The Nucleus Reference3’s can fire straight ahead, OR angled in, towards the listening position. Stereo imaging will be more specific when angled in, and upper bass will be more prominent and "faster sounding.
Focal
The loudspeakers should be positioned symmetrically, facing the listening area, ideally forming an equilateral triangle with it. It is, however, possible to change these distances to reach the ideal compromise for any particular conditions (fig. C). The loudspeakers should be positioned at the same height, in the same horizontal plane. Ideally, the tweeter should be positioned at the same height as the listener's ear when listening normally (fig. D).
Do not position your loudspeakers too close to a corner of the room and do not place them too close to a wall. If they are positioned close to a wall or a corner this has the effect of exciting certain resonances within the room and artificially increasing the bass. Conversely, if the bass level is judged to be insufficient, you could try moving the loudspeakers nearer a wall to re-balance the bass level (fig. E).