CABASSE MT30 Notice D'installation page 10

e n g l i s h
Speakers are delivered with a front grille to protect drivers. It is
possible to use them without this front grille, by gently pulling
its top end in order to cut off its magnetic link with the magnets
to the front panel. To get the grill back in place, position it in
front of the speaker and approach it to the front panel until the
magnetic link is effective. These operations must be carried
out very smoothly in order not to damage prematurely the
veneer covering the magnets on the front panel of the speaker.
We recommend this protection to be kept on to prevent acci-
3
dental damage to the drivers
Powerful drivers generate magnetic fields that can extend
beyond the boundaries of the speaker cabinet. We recom-
mend you keep magnetically sensitive articles (TV, computer
screen, computer discs, audio and video tapes, swipe cards...)
at least 1.5 ft (50 cm) away from the speaker. Cabasse centre
speakers or the ones marked «TV» are not concerned with
this, being magnetically shielded.
Positioning speakers in a room
In addition to vertical position of the speakers themselves,
their location in the listening room, as well as the acoustical cha-
racteristics of the room, are also very important. As it is impos-
sible to indicate a typical location of speaker systems without
a few tests, we suggest several general rules that are impor-
tant to apply in order to obtain the best listening results.
Optimal positioning for a 2.0 or stereo system
For the ideal positioning of your speakers follow diagram.
■
If «d» is the distance between the two speakers, this distance
must be higher than 5 ft (1.5 m) and the two speakers must be
at equal distance from the listening area which forms with
them an equilateral triangle.
The drivers must be directed towards the listening area.
■
The speakers should be located so that their diffusion follows
■
the longest dimension of the room.
Generally speaking it is better to avoid putting the speakers
■
in the corners of a room as this amplifies the low frequencies
and tends to enhance the room resonances. If possible it is
better to place the speakers at least 8 inches (20 cm) from
the walls.
Moreover, in order to obtain a more accurate frequency res-
■
ponse, it is recommended to raise a compact speaker from
12 to 16 inches (30 to 40 cm) above the floor by placing them
on stands. The tweeters of the speakers must be roughly at
the same height of the listener's ear when the listener is in sit-
ting position.
No solid object or piece of furniture should be placed between
■
the speakers and the listener. An effect of mask, even partial dis-
turbs completely the sound reproduction as it attenuates the
high frequencies and also, in most cases, the midrange fre-
quencies.
Placing the speakers in niches is not recommended. Unless
■
designed for this application, bookshelf placement will alter the
frequency response of the speaker, especially in the low fre-
quencies. If a bookshelf location cannot be avoid, the speaker
should be set up to minimize various resonance, and the visible
part of the grille must be outside the niche.
Optimal positioning for a 2.1
or stereo with a subwoofer system
For a stereo listening with 2 speakers or 2 satellites and 1 sub-
woofer, we recommend you to place the subwoofer in the
front listening area. The placement of the subwoofer against
a wall reinforces the low frequencies and limit the reflections
from 80 to 200 Hz. However to obtain the best results, it is
always necessary to carry out tests according to the acoustic
of the room.
.
4
5
Optimal positioning for a 5.1
6
or home theatre system
Setting up a multi-channel Audio-Video
care when positioning the specific AV speakers.
■ The centre speaker should be placed as close as possible to
the screen and where it sounds best from your listening spot
while offering the optimal picture/dialogues cohesion. Theo-
retically, the screen should be located within a virtual triangle
formed by the acoustical centres of the main speakers and the
centre speaker. Practically speaking, this means that the prin-
cipal speaker should be placed above the screen if the main
speakers are below it, and below the screen if the main spea-
kers are above. The centre speaker should also, if possible, be
set slightly back from the others, so that it is located at the same
distance from the listener as the main speakers.
■ The rear speakers or surround should be placed against the
side walls, at listening height. They should not be positioned
far behind the listening zone.
■ The subwoofer should be placed in the front listening area,
its position against a wall reinforces the extreme low register and
limits the reflections between 80 and 200 Hz. However to
obtain the best result, it is always necessary to carry out tests
according to the acoustics of the room.
Your AV processor enables the adjustment in level and delay of
each of the 5/6/7 channels of your system. Fine-tuning is neces-
sary to obtain a perfect sound stage.
Turn off all the amplifiers before interconnecting them to the
loudspeakers. In order to connect loudspeakers properly, it is
most important to keep in mind the following two factors:
cable section and phase.
CONNECTION
Cable section
To get the full sonic potential of Cabasse loudspeakers and
avoid power losses, the cables connecting the speakers to the
power amplifier must
Lenght
have the lowest pos- amplifier and loudspeakers
sible electrical resis-
tance. To help you in
choosing the correct
cable gauge, follow
diagram.
Phase
In order to maintain the phase relationship and frequency balan-
ce of the loudspeaker system, both loudspeakers must be pro-
perly connected to the power amplifier. When properly connec-
ted, the cones of the drivers of both loudspeakers will move in
the same direction when driven by identical speakers will move
in the same signals. If the cones move in opposite directions, the
resulting out of phase signals will create a perceptible power
loss, particularly in the low frequencies. The stereophonic mes-
sage will also be degraded. Amplifier and speaker manufacturers
typically indicate connection polarity in one of two ways: red
and black or plus and minus. In
either case, always connect red or
plus to red or plus and black or
minus to black or minus. Connec-
Attention,
tions should be identical for both
before operating the unit,
channels. To check that the spea-
be sure that the
kers are in correct phase, switch
operating voltage
the system to mono while music
of your unit is identical
is being played. if the amplifier
with that of your local
power voltage. does not have a phase inversion
switch, it will be necessary to chan-
system requires great
between recommanded
section
4.5 m 1.5 mm 2
6 m 2 mm 2
7.5 m 2.5 mm 2
9 m 3 mm 2
12 m 4 mm 2