Focal DIABLO UTOPIA Manuel D'utilisation page 20

DIABLO UTOPIA
U s e r m a n u a l
20
Positioning
The loudspeakers have been engineered to deliver the most faithful sound reproduction, whether they are used for music or home
cinema. In order to enhance their performance, to guarantee a high quality of listening, sound image and tone balance, it is important
to note the following basic rules.
The listening area must be located at the summit of an equilateral triangle whose two other points of insertion are determined by the
position of each speaker. Nevertheless it is possible to modify these distances to find an ideal compromise according to the particular
disposition of the room (fig. A).
Each loudspeaker must be placed at the same height and on the same floor plan. The tweeter should be at the same height as the
listener's ear, when the listener is in their usual listening area (fig. B).
Avoid placing the loudspeakers too close to the room's corners or walls. This will induce some unwanted room resonance and
artificially increase bass response. On the contrary, if the bass level proves to be insufficient, it is possible to move the speakers closer
to the walls to adjust the bass level (fig. C).
Optimization
To please the perfectionists, we shall give an optimum positioning formula :if A is the distance from the boomer centre to the closest
wall (floor or wall), B the intermediate distance and C the longest distance (A<B<C), the relation B2=AC determines the ideal position
of the speakers (fig. D)
.
• Example 1:
The boomer centre is 60cm (24") from the floor (B=60cm) (mini speaker on a foot), standing 50cm (20") from the back wall (A=50cm),
the side wall will be ideally 72cm (28") (C=B2 ⁄ A=72cm).
• Example 2:
The boomer centre is 30cm (12") from the floor (column speaker) (A=30cm), 1m (39") from the back wall (C=1m), the clearance with
respect to the side walls will be B=√AC=54.7cm (22").
Connections
Input sockets ensure reliable multipurpose connections for stripped cables as well as for plugs.
It is imperative to respect the connector polarity of both the loudspeaker and amplifier. The positive terminal "+" must be
connected to the corresponding (matching) amplifier's terminal and the negative terminal "-" to the negative terminal (fig. E).
Stereo image, soundstaging and bass perception would be seriously compromised if these conditions were not respected.
User instructions
The sound rendition of the loudspeaker strongly depends upon the listening room acoustics, the place of the loudspeakers and the
listening area. These factors can be modified in order to correct or enhance a desired effect.
Should the soundstage be im-precise or not centred, try to move the loudspeakers closer to each other.
Harsh or aggressive sound means that your listening room is probably too reflective. Try to use any absorbing materials (such as
tapestries, sofa, wall coverings, curtains...) combined with reflective materials to absorb or diffuse resonances.
Should the sound be "flat" or muffled, there are too many absorbing materials in the listening room. The sound appears to be closed-
in, with a narrow stereophonic image. Try to find a better compromise between absorbing and reflective materials within your listening
room.
Generally the wall to the rear of the speakers should be made up of reflective materials so that the sound image exhibits satisfying
volume and width. On the contrary the wall on the rear of the listener should be absorbing in order to avoid reflections damaging
the perception of the stereo soundstage. These reflections may limit the impression of depth of the sound image. Furniture, such as
bookshelves should ideally be placed along the side walls in order to diffuse sound waves and to prevent some frequencies from being
amplified, especially in vocal range (it removes "flutter echo").