OWNER'S MANUAL
C D M 1
COM2
LISTEN AND YOU'LL SEE
INTRODUCTION
Thank you- for purchasing B&W CDM
speakers.
V
Since its foundotion in 1966, the
continuing philosophy of B&W has been
the quest for perfect sound reproduction.
Inspired by the company's founder, the late
John Bowers, this quest hos entailed not
only high investment in audio technology
and innovation but also an abiding
appreciation of music to ensure that the
technology is put to maximum effect.
And it is our policy to moke sure the
odvanced features pioneered on one
product are incorporated into others we
manufocture.
UNPACKING
(figure 1)
Fold the top carton flaps right back and
invert the carton and contents.
Lift the corton clear of the contents.
Remove the inner packing from the
product.
We suggest you retain the pockaging for
future use.
Check the carton contoins In addition to
this user monuol:
• One pair of CDM speakers
• One pair of foam plugs
CDM systems have cobinels with
contoured edges for low diffraction,
incorporoting Kevlar«' cone
boss/midronge drive units for lowest
coloration and maximum definition. They
olso have olloy dome tweeters with
magnetic fluid cooling to ensure good
definition to the limits of audibility and
maintain dynamics to high sound levels.
Additionally, in the case of the COM 1, the
tweeter is free mounted to improve the
spociousness of the stereo imoge. All these
features were originally developed for the
acclaimed B&W 800 Series systems and go
towards the realisation of fine transducers.
However, no motler how good the
speoker itself, it must work well into the
listening room and time spent on the
installation process will reap the reward of
many hours listening pleasure. Pleose road
through this manual fully. It will help you
optimise the performance of your audio
system.
B&W distribute to over 50 countries
world'Wrde ond moinloin o network of
dedicoled distributors who will be able to
help should you hove any problems your
deoler cannot resolve.
POSITIONING
(figure 2o)
Some experimentotion with the position
of the speakers is wall worthwhile to
optimise the interaction between them and
the listening room. However, os on initial
guide:
• Place the speakers on firm dedicated
stands that place the tweeters at
approximolely eor level. Stands should be
considered as port of the speakers • they
affect the sound quality. Ask your dealer
for advice on the best type for your needs.
• Place the speokers ond the centre of
the listening area opproximately at
the corners of an equilateral Iriongle.
• Keep the speakers at least 1.5m (5ft|
oport to mointain left*right stereo
seporotion.
• Keep the speaker boHles at least
O.Sm (20in) cleor of wolls. Having the
speakers too close to walls increoses
the level of bass relolive to the
midrange and may give o boomy
quality to the sound.
Space behind the speokers also improves
the impression of perspective on well
recorded molerial.
CONNECTIONS
(figwre 3)
All connections should be mode with
the equipment turned off.
There ore two pairs of gold plated
terminals at the bock of each speoker (one
pair to the bass/midrange and one pair to
the tweeter) which permit bi*wiring or bi>
amplificotion if desired. On delivery, both
pairs ore connected together by high*
quality gold plated copper links for use
with o single twin cable. To remove the
links, simply loosen the terminal caps.
The use of seporote cables to the two
drive units can improve the reproduction of
low'level detail by reducing interaction in
the crossover ond allowing optimum choice
of cable for each frequency ronge. When
choosing coble, keep its total impedance
(out and bock) below the moximum
recommended in the specification. In
particular the coble to the tweeter should
have low inductance, otherwise the very
high frequencies will be ottenuated. Ask
your dealer for advice, os the optimum
cable will depend on the length required.
The terminals accept bare wires or 4mm
(0.16in) dia bonona plugs. Connect the
positive terminols on the speaker (marked
and with a red band) to the positive
+
terminal on the power amplifier ond
negotive (•, block) to negative. Foiluro to
observe correct polarity will result in poor
sound balance ond imoging. Make sure the
terminal caps are screwed down tight even
when using banano plugs, os otherwise
they may rattle.
FINE TUNING
Before fine tuning the instollation,
double check the polorily and security of
the connections.
if the level of boss is uneven with
frequency, this is usually duo to strong
excitation of resonance modes in the room.
Even small changes in the position of the
speakers within the listening room can
hove o profound effect on the perceived
sound quality by altering the excitation of
these modes. Try mounting the speakers
along o different woll. Even moving lorge
pieces of furniture obout can hove an
effect.
If the generol level of boss is too high
and you cannot move the speakers further
from the wells, reduce the port output by
inserting the foam plugs provided
(figure 4).
If the centro! image is poor, try moving
the speakers closer together or toeing
them in so they point ot or just in front of
the listening area (figure 2b).
If the sound is too harsh, increase the
amount of soft furnishing in the room. For
example, use heavier curtoins. Conversely
reduce the amount of soft furnishing if the
sound is dull and lifeless.
Test for flutter echoes by clapping your
hands and listening for rapid repetitions.
These can smear the sound, but may be
reduced by irregular shaped surfoces such
as bookshelves and large pieces of
furniture.
Ensure the speaker stands are firm on
the floor. If you have o carpet, use carpet
piercing spikes and adjust them to take up
any unevenness in the floor surface.
AFTERCARE
The real wood veneers ore locquer
finished ond normolly only require dusting.
If you wish to use on aerosol cleoner,
remove the grille first by gently pulling it
away from the cabinet. Sproy onto the
cloth, not directly onto the eobinet. The
cloth may be cleaned with o normol clothes
brush öfter removing the grille from the
cabinet.
Avoid touching the drive units,
especiolty the tweeter, as domoge moy
result.
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COM 1
DESCRtl>tlON
DRIVE UNITS
2-way 4th*ordar vonfed>box syffetn
One 165mm {6'/iin) dia boss/midrange wHh rigid die-cosl batkoi. Kevlar"
diophragm and 31mm (1V*in) dio high-power voice coil on Kaplon'' former
One free-mounted 26mm (lln) die high-frequency whh alloy dome, high-power
voice coil and magnetic fluid cooling
FREQUENCY RANGE
FREQUENCY RESPONSE 64Hz-20kHz ±2d8 on reference axis, free-field conditions
DISPERSION Within 2dB of response on reference oxis
-¿dS ot 46Hz and 25kHz
Horizontol: over 40* ore
Vertical: over 10’ ore
SENSITIVITY
HARMONIC DISTORTION
NOMINAL IMPEDANCE
CROSSOVER FREQUENCY
88dB spi (2J3V, 1m)
2nd & 3rd hormonics <1% 100Hz-20kHz |90dB spi. 1m)
812 (minimum 4 Jl2}
3kHz
If
A,
POWER HANOtINC
MAXIMUM RECOMMENDED
CABLE IMPEDANCE
DIMENSIONS
FINISHES
Suitable for amplifiers with 30-120W output eontinuous
on undipped speech ond music programme.
0.312
Height
Width
Depth
Cabinet:
Grille:
370mm (14.6in)
220mm (8.7in)
274mm (lO.Sin)
Real wood veneers of Bloch Ash or Red Ash
Black Cloth
COM 2
OESCIIFTION
DItVE UNITS
FIEOUENCY lANGf
FIEOUCNCr RESPONSE
DiSREtSION
SENSITIVITY
HARMONIC DISTORTION
NOMINAI IMREDANCE
CROSSOVER FREQUENCY
2-way 4lh-order vented-box system
One 165mm (6/tin) dio bais/midrange with Kevlor^ diaphragm and
31mm (1/•in) dio high-power voice coil on Kapton^ former
One 26mm (lin) dio high-frequency with alloy dome, high-power voice coil and
magnetic fluid cooling
-6dBot 51Hz and 25kHz
70Hz • 20kHz ±2dB on reference axis, free-field conditions
Within 2d8 of response on reference axis
Horizontol: over 40’ ore
Verticol: over 10* arc
87dB spl (2.83V, 1m)
2nd & 3rd harmonics <1% 100Hz - 20kHz (90dB spl, 1m)
8U (minimum 4.5(2)
3kHz
ROWER HANDLING
MAXIMUM RECOMMENDED
CABLE IMREOANCe
DIMENSIONS Heighi: 316mm (14.4in)
FINISHES
Suitoble for amplifiers with 30-120W output continuous
on unclipped speech and music programme.
0.3(2
Width; 220mm (8.7in)
Depth: 242mm (9.5in)
Cabinet:
Reol wood veneers of Block Ash or Red Ash
Grille: Block Cloth
Kevtor emt Kspfon or* r*9*tt*r*d trod* markt of Ouponl.
UW lewdtpeofcen Utl. r*t*rv*i Rm righi to o«n*nd d*tei1i el Ih* »podRcatSem la Ba* with Hrchnkol
devio pmonH.
CopyrlRh' C MW Uwdtp«ok*rt Ud.
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