Limited Warranty - Bowers & Wilkins CM Serie Manuel D'utilisation

the speakers will also help to create an aural
impression of depth. Conversely, moving the speakers
closer to the walls will increase the volume of bass. If
you want to reduce the volume of bass without
moving the speakers further from the wall, fit the foam
plugs in the port tubes as illustrated in Figure 3.
If the bass seems uneven with frequency this will most
probably be due to resonance modes in the listening
room. Even small changes in the position of the
speakers or the listening position can have a profound
effect on how these resonances affect the sound. Try
moving the listening position or locating the speakers
along a different wall. The presence and position of
large pieces of furniture can also influence resonance
modes.
If the central image lacks focus, try moving the
speakers closer together or angling them inward so
that they point at a location just in front of the listening
position. Figure 1b illustrates speakers angled inwards.
If the sound is too bright, increasing the amount of
soft furnishing in the room (heavier curtains for
example) may help balance the sound. Conversely,
reducing the amount of soft furnishing may help
brighten a dull sound.
Some rooms suffer from "flutter echoes" – echoes that
"bounce" between parallel room boundaries. Flutter
echoes can colour the sound of the speakers in the
room. Test for flutter echoes by standing in the middle
of the room and clapping your hands. Flutter echoes
can be reduced by placing irregular shaped items or
non-reflective surfaces, bookshelves, rugs or pictures
for example, on one of the offending walls or floor.
Ensure that the speaker stands firmly on the floor. Use
carpet piercing spikes if appropriate and adjust them
to take up any unevenness.
Running-in Period
The performance of the speaker will change subtly
during the initial listening period. If the speaker has
been stored in a cold environment, the damping
compounds and suspension materials of the drive
units will take some time to recover their correct
mechanical properties. The drive unit suspensions will
also loosen up during the first hours of use. The time
taken for the speaker to achieve its intended
performance will vary depending on previous storage
conditions and how it is used. As a guide, allow up to
a week for the temperature effects to stabilise and
15 hours of average use for the mechanical parts to
attain their intended design characteristics.
However, longer run-in periods (as long as a month)
have been reported and there is evidence to suggest
that this has little to do with the speaker changing and
more to do with the listener getting used to the new
sound. This is especially so with highly revealing
speakers such as these, where there may be a
significant increase in the amount of detail compared
with what the listener has previously been used to; the
sound may at first appear too "up front" and perhaps
a little hard. After an extended period of time, the
sound will seem to mellow, but without losing clarity
and detail.
Aftercare
The cabinet surfaces usually only require dusting. If
you wish to use an aerosol or other cleaner, remove
the grille first by gently pulling it away from the
cabinet. Spray aerosols onto the cleaning cloth, not
directly onto the product. Test a small area first, as
some cleaning products may damage some of the
surfaces. Avoid products that are abrasive, or contain
acid, alkali or anti-bacterial agents. Do not use
cleaning agents on the drive units. The grille fabric
may be cleaned with a normal clothes brush whilst the
grille is detached from the cabinet. Avoid touching the
drive units, especially the tweeter, as damage may
result.
We have chosen the finest wood veneers for the
surface of the cabinet, but please be aware that, like
all natural materials, the veneer will respond to its
environment. Keep the product away from sources of
direct heat such as radiators and warm air vents to
avoid the risk of cracking. The wood is treated with an
ultra-violet resistant lacquer to minimise changes in
colour over time, but a degree of change is to be
expected. This effect may be particularly noticeable
where the area covered by the grille, or areas kept in
shadow, change more slowly than other areas. Colour
differences may be rectified by exposing all the veneer
surfaces equally and evenly to sunlight until the colour
is uniform. This process can take several days or even
weeks, but may be accelerated by careful use of an
ultra-violet lamp.

Limited Warranty

This product has been designed and manufactured to
the highest quality standards. However, if something
does go wrong with this product, B&W Group Ltd. and
its national distributors warrant free of charge labour
(exclusion may apply) and replacement parts in any
country served by an official B&W distributor.
This limited warranty is valid for a period of five years
from the date of purchase or two years for electronics
including amplified loudspeakers.
Terms and Conditions
1 The warranty is limited to the repair of the
equipment. Neither transportation, nor any other
costs, nor any risk for removal, transportation and
installation of products is covered by this warranty.
2 This warranty is only valid for the original owner. It
is not transferable.
3 This warranty will not be applicable in cases other
than defects in materials and/or workmanship at
the time of purchase and will not be applicable:
a. for damages caused by incorrect installation,
connection or packing,
b. for damages caused by any use other than correct
use described in the user manual, negligence,
modifications, or use of parts that are not made or
authorised by B&W,
3