Choice Of Speakers; Central Channel Placement; Effect Channel Speakers's Place; Magnetic Disturbance - Focal JMlab Profile 908 Manuel D'utilisation

PROFILE
U s e r m a n u a l
9

Choice of speakers

Yours loudspeakers have been engineered to work with stereo systems as well as with home theater systems. If you already
own a pair of stereo Profile loudspeakers and wish to purchase a complete home theater system, it is of the utmost
importance that you use the central and effect loudspeakers of the same product line. It is the sole possible condition to
bring to your system a perfect tonal homogeneity and a realistic and coherent reproduction of tri-dimensional effects within
the listening room.

Central channel placement

Central channel speakers should be placed close to the TV-screen to obtain a proper placement and a realistic reproduction
of the dialog. They could be placed below or above the TV-screen if your TV-unit permits (fig. F).
If a standart projection screen is used, the central channel speaker must be placed under the screen.
If an acoustically transparent projection screen is used, the central channel speaker can be placed behind and at the
bottom of the screen (fig. G).

Effect channel speakers's place

The soundtrack mix for a film or music encoded in multichannel format is very complex and allows the listener to benefit
from a wide range of special sound effects, which require the use of effect channel speakers. In order to obtain a realistic
3D soundstage, the placement of the speakers is decisive, even when confronted with a restrictive disposition of the
listening room.
For enhanced performance, the following elements should be noted.
Avoid placing the effect speakers too far from the listening area otherwise the sound perception will be altered. In
order to obtain surround effects, with great sound density we advise you to place the speakers against the sidewalls on
each side of the listening room (fig. H, I).
Place the effect speakers at a suitable height, slightly above the listener's ears (fig. J).
The SR 908 dedicated surround speaker is provided with a wall mounting kit (fig. K).
A / V amplifiers include compensation systems, which allows to set the delay applied on each channel. In certain
conditions, the distance between each speaker and the listening area may vary.
The latest high-level film soundtracks are now mixed in 6.1. This system requires the use of one or two central surround
channel speakers (depending on the amplifier) which should be placed behind the listening area. If two effect speakers
are used simultaneously, make sure that they are not too far from each other (less than one meter; 40 inches) in order to
obtain the best results.

Magnetic disturbance

In home theater systems, the magnetic radiation of the loudspeakers must be taken into consideration.
Floorstanding speakers which are fully magnetically shielded, all other 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 too close
to the TV. In case of problems, some TV screens (or computer monitor) feature a degauss control, but not systematically.