Bowers & Wilkins CM1 User manual

CM1
Owner’s Manual
and Warranty

>0.5m
(19.7 in)
110o- 130o

English
Limited Warranty
Dear customer,
Welcome to B&W.
This product has been designed and manufactured to
the highest quality standards. However, if something
does go wrong with this product, B&W Loudspeakers
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,
c. for damages caused by faulty or unsuitable
ancillary equipment,
d. for damages caused by accidents, lightning, water,
fire heat, war, public disturbances or any other
cause beyond the reasonable control of B&W and
its appointed distributors,
e. for products whose serial number has been
altered, deleted, removed or made illegible,
f. if repairs or modifications have been executed by
an unauthorised person.
4 This guarantee complements any national/regional
law obligations of dealers or national distributors
and does not affect your statutory rights as a
customer.
How to claim repairs under
warranty
Should service be required, please follow the following
procedure:
1 If the equipment is being used in the country of
purchase, you should contact the B&W authorised
dealer from whom the equipment was purchased.
2 If the equipment is being used outside the country
of purchase, you should country of residence who
will advise where the equipment can be serviced.
You can call B&W in the UK or visit our web site to
get the contact details of your local distributor.
To validate your warranty, you will need to produce
this warranty booklet completed and stamped by your
dealer on the date of purchase. Alternatively, you will
need the original sales invoice or other proof of
ownership and date of purchase.
Owner’s manual
Introduction
Thank you for choosing B&W. Please read this manual
fully before unpacking and installing the product. It will
help you to optimise its performance. B&W maintains
a network of dedicated distributors in over 60 countries
who will be able to help you should you have any
problems your dealer cannot resolve.
Environmental Information
B&W products are designed to comply with
international directives on the Restriction of Hazardous
Substances (RoHS) in electrical and electronic
equipment and the disposal of Waste Electrical and
Electronic Equipment (WEEE). The crossed wheelie bin
symbol indicates compliance and that the products
must be appropriately recycled or processed in
accordance with these directives.
Carton Contents
Check in the carton for:
2 Foam plugs.
8 Self-adhesive rubber pads.
Speaker Installation
The speakers are best used mounted on rigid floor-
stands that locate the tweeters approximately at ear
level when seated. Shelf or wall bracket mounting is
an option but it provides less opportunity for
optimising the sound through adjustment of speaker
position.
The specific stand or wall mount used will affect the
sound quality of the speakers. The B&W FS-700/CM
stand is recommended.
If the speakers are to be placed on a shelf or furniture
unit, the adhesive pads supplied may be attached to
the underside of the cabinet.
Speaker Positioning
Adjustment of speaker position following initial
installation will probably further improve the sound
quality and is usually worthwhile.
In either stereo or home theatre installations try to
ensure that the immediate surroundings of each
speaker are similar in acoustic character. For example,
if one speaker is adjacent to bare walls while the other
is adjacent to soft furnishings and curtains, both the
overall sound quality and the stereo image are likely to
be compromised.
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Conventional Stereo Systems
To begin with, the speakers should be positioned
between 1.5m and 3m apart at two corners of an
equilateral triangle completed by the listening area at
the third corner. The speakers should be
approximately 0.5m away from the back wall, and at
least 0.5m away from any side walls. Figure 1a
illustrates this arrangement.
Home Theatre Systems
If the speakers are to be used for the front channels in
a home theatre system they should be placed closer
together than for 2-channel audio because the
surround channels tend to widen the image.
Positioning the speakers within approximately 0.5m of
the sides of the screen will also help keep the sound
image in scale with the visual image. The speakers’
height should be somewhere between the centre of
the screen and the height of the centre speaker. As
with conventional stereo positioning, the speakers
should ideally be approximately 0.5m away from the
back wall, and at least 0.5m away from any side walls.
If the speakers are to be used for the surround
channels in a home theatre system, position them as
illustrated in Figures 1c to 1e according to the number
of channels. To achieve even coverage over an
extended listening area it is beneficial to raise the
speakers above ear height.
Stray Magnetic Fields
The speaker drive units create stray magnetic fields
that extend beyond the boundaries of the cabinet. We
recommend you keep magnetically sensitive articles
(television and computer screens, computer discs,
audio and video tapes, swipe cards and the like) at
least 0.5m from the speaker.
Connections
All connections should be made with the equipment
switched off.
There are 2 linked pairs of terminals on the back of the
speaker. For conventional connection the terminal links
should remain in place (as delivered) and just one pair
of terminals connected to the amplifier. For bi-wire
connection the terminal links should be removed and
each pair of terminals connected to the amplifier
independently. Bi-wiring can improve the resolution of
low-frequency detail. Figures 2a and 2b illustrate
conventional and bi-wire connection.
Ensure that positive terminals on the speaker (marked
+ and coloured red) are connected to the positive
output terminal on the amplifier and that negative
terminals on the speaker (marked – and coloured
black) are connected to the negative output terminal
on the amplifier. Incorrect connection can result in
poor imaging and loss of bass.
Ask your dealer for advice when selecting speaker
cable. Keep its total impedance below the maximum
recommended in the speaker specification and use a
low inductance cable to avoid attenuation of high
frequencies.
Fine Tuning
Before fine tuning, make sure that all the connections
in the installation are correct and secure.
Moving the speakers further from the walls will
generally reduce the volume of bass. Space behind
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 are upright and firm 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
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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 surface usually only requires dusting. If
you wish to use an aerosol cleaner, remove the grille
first buy gently pulling it 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.
Avoid touching the drive units, especially the tweeter,
as damage may result.
Français
Garantie limitée
Cher Client,
Bienvenue à B&W.
Ce produit a été conçu et fabriqué en vertu des
normes de qualité les plus rigoureuses. Toutefois, en
cas de problème, B&W Loudspeakers et ses
distributeurs nationaux garantissent une main d’œuvre
(exclusions possibles) et des pièces de rechange
gratuites dans tout pays desservi par un distributeur
agréé de B&W.
Cette garantie limitée est valide pour une période de
cinq ans à compter de la date d’achat ou une période
de deux ans pour les composants électroniques, y
compris les haut-parleurs amplifiés.
Conditions
1 La garantie est limitée à la réparation de
l’équipement. Les frais de transport ou autres, les
risques associés à l’enlèvement, au transport et à
l’installation des produits ne sont pas couverts par
cette garantie.
2 La garantie est exclusivement réservée au
propriétaire d’origine et ne peut pas être
transférée.
3 Cette garantie ne s’applique qu’aux produits
faisant l’objet de vices de matériaux et/ou de
construction au moment de l’achat et ne sera pas
applicable dans les cas suivants :
a. détériorations entraînées par une installation,
connexion ou un emballage incorrect,
b. détériorations entraînées par un usage autre que
l’usage correct décrit dans le manuel de
l’utilisateur, la négligence, des modifications ou
l’usage de pièces qui ne sont pas fabriquées ou
agréées par B&W,
c. détériorations entraînées par un équipement
auxiliaire défectueux ou qui ne convient pas,
d. détériorations résultant de : accidents, foudre, eau,
chaleur, guerre, troubles de l’ordre public ou autre
cause ne relevant pas du contrôle raisonnable de
B&W ou de ses distributeurs agréés,
e. les produits dont le numéro de série a été modifié,
effacé, éliminé ou rendu illisible,
f. les produits qui ont été réparés ou modifiés par
une personne non autorisée.
4 Cette garantie vient en complément à toute
obligation juridique nationale / régionale des
revendeurs ou distributeurs nationaux et n’affecte
pas vos droits statutaires en tant que client.
Comment faire une réclamation en vertu de
la garantie
Veuillez respecter la procédure ci-dessous, si vous
souhaitez faire une réclamation sous garantie :
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40
CM1
Technical features
Description
Drive units
Frequency range
Frequency response
Dispersion
Sensitivity
Harmonic distortion
Nominal impedance
Crossover frequency
Recommended amplifier power
Max. recommended cable impedance
Net Weight
Nautilus™ tube-loaded aluminium dome tweeter
Kevlar®brand fibre cone bass/midrange
Flowport
2-way vented-box system
1x ø25mm (1 in) aluminium dome high-frequency
1x ø130mm (5 in) woven Kevlar®cone bass/midrange
-6dB at 45Hz and 50kHz
55Hz - 22kHz ±3dB on reference axis
Within 2dB of reference response
Horizontal: over 60oarc
Vertical: over 10oarc
84dB spl (2.83V, 1m)
2nd and 3rd harmonics (90dB, 1m)
<1% 110Hz - 22kHz
8
Ω (minimum 5.1 Ω )
4kHz
30W - 100W into 8
Ω on unclipped programme
0.1
Ω
6.7kg (14.7 lb)

Copyright © B&W Group Ltd. E & OE
Kevlar is a registered trademark of DuPont
Nautilus is a trademark of B&W Group Ltd.
Printed in England.
B&W Group (UK Sales)
T [phone]
E [email protected]
B&W Group North America
T [phone]
E [email protected]
B&W Group Asia Ltd
T [phone]
E [e-mail]
B&W Group Ltd
Dale Road
Worthing West Sussex
BN11 2BH England
T [phone]
F [phone]
[email protected]
www.bwspeakers.com
ll09491 Issue 1