Focal CHORUS 826 W, Руководство пользователя

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installation
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.
Magnetic disturbance
In home theater systems, the magnetic
radiation of the loudspeakers must be
taken into consideration.
With the exception of the center
speakers which are fully magnetically
shielded, all other Chorus W
loudspeakers generate a magnetic
leak that can interfere with household
appliances, some of which are
sensitive to this phenomenon. It is
strongly advised not to place front
loudspeakers closer than 50cm to
your TV screen.
Frame geometry as well as colours can
be severely distorted by a magnetic
field if the loudspeaker is placed to
close to the TV. In case of problems,
some TV screens (or computer
monitor) feature a degauss control,
but not systematically
(fig. B) .
Positioning
The Chorus W 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. C) .
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. D) .
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. E) .
Optimization
For perfectionist people, we will give
an optimum positioning rule:
If
A is the determined distance
between the floor and the middle of
the two woofers (X),
C is the distance
between X and the side or back wall,
then the distance
B is found with the
equation B
2
= AC.
• Example:
The woofer center is at 50cm from
the floor (A= 50cm). We decide
that the distance between X and the
side wall will be 72cm (C = 72cm),
the loudspeaker will then have to be
placed at 60cm from the back wall.
B
2
= 50 x 72 = 3600 (fig. F).
B = √3600 = 60cm
03
Accessories
The Chorus 826 W include four
decoupling spikes (cones). The spikes
are adjustable in height with the
supplied key. This key can be reserved
for future use in a small housing
behind the grille after installation and
optimization.
Installation of spike caps