Bowers & Wilkins CT800 Manuel Du Propriétaire page 5

output level of that channel's CT8 XO in order to
restore the correct tonal balance.) The LFE channel is
then distributed to all the main channels that have a
subwoofer assigned by the simple action of
configuring the surround processor as if there were no
subwoofer present and specifying where the LFE
signal should be routed. Strictly speaking, the phrase
"no subwoofer" here means "no subwoofer dedicated
to the LFE channel".
Safety Warning!
A CT800 system is capable of producing
very high sound pressure levels.
Prolonged exposure to high sound levels
can lead first to temporary and later
permanent hearing damage. Do not exceed
recommended Leq (equivalent sound level) exposure
levels, for example, those specified in ISO 1999:1990.
Running In and Ancillary Equipment
Ancillary Equipment
Speakers of this ability deserve signals of the highest
quality. Choose your electronic equipment and
interconnecting cables with care. We can give
guidance on what to look for when choosing ancillary
equipment, but cannot recommend specific items. The
standards of such products are improving all the time
and your dealer will be able to demonstrate a variety
of suitable up-to-date products.
In the specification we recommend a range of amplifier
powers. The higher figure is defined by the power
handling capability of the speaker. When calculating
the power handling, it is assumed that the amplifier is
not run into clipping, which distorts the frequency
power spectrum of the signal, and that the signal is
normal programme material. Test tones from
oscillators and the like are not applicable. The lower
figure is the minimum we consider necessary to
achieve reasonable listening levels without audible
distortion in the smaller room (less than 60 m
2000 cu ft). The higher the power you use, the less
likely you are to experience amplifier clipping.
You can often tell how good an amplifier is at driving
complex speaker loads by looking at its power rating
into both 4Ω and 8Ω loads. The nearer the ratio is to
2:1 the better, as it indicates a good current capability.
In order to reduce the effect the cable has on the
frequency response of the speaker to inaudible levels,
the impedance of the cable at all frequencies
(measuring both positive and negative conductors in
series) should be kept as low as possible and certainly
below 0.1Ω. At low frequencies, the DC resistance of
the cable is the dominant factor and you should
choose a gauge of wire sufficient to achieve the
impedance requirements over the length of cable you
need to use. At mid and high frequencies the inductive
component of the impedance can dominate the DC
resistance. This and other properties influenced by the
detailed construction of the cable become important.
4
All manuals and user guides at all-guides.com
Running In
The performance of the speakers will change subtly
during the initial listening period. If they have been
stored in a cold environment, the damping compounds
and suspension materials 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 speakers to
achieve their intended performance will vary
depending on previous storage conditions and how
they are 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 a new
sound. It is especially so with highly revealing
speakers such as these, where there may be a
significant increase in the amount of detail portrayed
compared to 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 speaker cabinet surfaces and the casing of the
CT8 XO usually only require dusting. If you wish to use
an aerosol cleaner, remove any speaker grilles first by
gripping round the edges and gently pulling them
away from the cabinet. Spray onto the cleaning cloth,
not directly onto the cabinet. The grille fabric may be
cleaned with a normal clothes brush whilst the grille is
detached from the cabinet.
When replacing grilles, ensure that the pegs are
correctly aligned with the receptacles in the cabinet
before pushing into place.
3 or
Avoid touching the drive unit diaphragms, especially
the tweeter, as damage may result.
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.