Focal Chrorus 700 Série Manuel D'utilisation page 7

CHORUS 700® SERIE
U s e r m a n u a l
7
Connections
The Chorus input sockets ensure reliable multipurpose connections for stripped cables as well as for plugs.
The "banana" terminals are obstructed in order to comply with electrical standards currently in force in
several countries. Make sure not to remove the plastic safety lids.
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. A). Stereo image, soundstaging and bass perception would be
seriously compromised if these conditions were not respected.
Positioning
The Chorus 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. B).
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. C).
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. D).
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 B =AC determines the ideal position of the speakers.
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• Example 1:
If the boomer centre is 50cm (20") away from the rear wall (A) and 60cm (24") above the floor (B), then
the side wall will be ideally 72cm (28") (C=B ⁄ A =72cm) (fig. E).
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User instructions
The sound performance of the Chorus loudspeaker depends strongly upon the listening room's 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 imprecise 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 carpet, 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 be
ideally 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").