Bowers & Wilkins DM 309 User manual

DM 307
Owner's Manual
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Owner's manual
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Figure 2
Figure 4

ENGLISH
INTRODUCTION
Thank you for choosing Bowers & Wilkins.
We are contident that you will enjoy many years
of listening pleasure from your speakers, but
please read this manual fully before installing
them. It will help you optimise their 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.
UNPACKING
(figure 1)
e Fold the carton flaps right back and invert
the carton and contents.
€ Lift the carton clear of the contents.
е Remove ihe inner packing from the product.
We suggest you retain the packing
for future use.
Check in the carton for:
е? foam plugs.
ө 4 spike feet with lock nuts.
POSITIONING
(ligure 2]
Do not fit the spike feet until you have found
the best position for your speakers.
As an initia! guide:
* Position the speakers and the centre of the
listening area approximately at the corners
of an equilateral triangle.
е Keep the speakers at least 1. 5m apart
fo maintain leftright separation.
e Keep the speaker Байез at least O. 5m clear
of walls.
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 O.5m from the
speaker.
CONNECTIONS
(figure 3)
All connections should be made with the
equipment
switched
ой.
There are 2 pairs of terminals а! the back of
the speaker which permit bi-wiring if desired.
On delivery, the separate pairs are connected
together with high-quality links for use with а
single 2-core cable. For single cable connection,
leave the links in place and use either pair of
terminals on the speaker.
Ensure the positive terminal on the speaker
{marked + and coloured red) is connected
to the positive output terminal of the amplifier
and negative [marked - and coloured black]
ю negative. Incorrect connection can result in
poor imaging and loss of bass.
To bi wire, remove the links by loosening the
terminal caps and use a separate 2-core cable
from the amplifier to each pair of terminals. This
can improve the resolution of low-level detail.
Observe the correct polarity as before. When
bi-wiring, incorrect connection can also impair
the frequency response.
The terminals accept 5mm еп) spades,
bared wire ends or round pins up to 5mm
diameter and 4mm banana plugs. When using
spades, fit them under the sliding collar.
Important safety notice:
In certain countries, notably those in Europe, the
use of 4mm banana plugs is considered a
potential safety hazard, because they may be
inserted into the holes of unshuttered mains
supply sockets. In order to comply with European
CENELEC salety regulations, the 4mm holes in
the ends of the terminals are blocked by piastic
pins. Do not remove the pins if you are using the
product where these conditions apply.
Always screw the terminal caps down tightly to
optimise the connection and prevent rattles.
Ask your dealer Юг advice when choosing
cable. Keep the total impedance below the
maximum recommended in the specification and
use a low inductance cable to avoid attenuation
of the highest frequencies.
FINE TUNING
Before fine tuning, double check that all the
connections in the installation are correct and
secure,
Moving the speakers further Нот the walls will
reduce the general level of bass. Space behind
the speakers also helps to create an impression
of depth. Conversely, moving the speakers closer
to the walls will increase the level of bass.
Е you want to reduce the bass level without
moving the speakers further from the wall, fit
the foam plugs in the port tubes (figure 4).
If ihe bass is uneven with frequency it is usually
due to the excitation of resonance modes in the
room. Even small changes in the position of the
speakers or the listeners can have a profound
effect on how these resonances affect the sound.
Try mounting the speakers along a different wall.
Even moving large pieces of furniture can have
an effect.
If the central image is poor, try moving the
speakers closer together or toeing them in
so they point at or just in front of the listeners
(figure 2].
If the sound is too harsh, іпсгесзе the amount
of soft furnishing in the room (for example use
heavier curtains], or reduce it if the sound is
dull and lifeless.
Test for flutter echoes by clapping your hands
and listening for rapid repetitions. Reduce them
by the use of irregular shaped surfaces such as
bookshelves and large pieces of furniture.
Ensure the speakers stand firmly on the floor.
Whenever possible fit the spike feet supplied
alter you have optimised the positioning. They
are designed fo pierce through carpeting to the
floor surface. Initially, screw the lock nuts fully
onto the spikes and screw the spikes fully into
the threaded inserts in the base of the speaker.
If the cabinet rocks, unscrew the appropriate
spikes until the speaker stands firmly on the floor
and lock them in place by tightening the lock
nuts against the base. If you do not have a
carpet, use a protective disc under the spikes
to protect the floor surface.
AFTERCARE
The cabinet surface usually only requires dusting.
IF you wish to use an aerosol cleaner, remove
the grille first by 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 unit diaphragms,
especiolly the tweeter, as damage moy result.

Technical features
Description
Drive units
Frequency range
Frequency response,
Dispersion
Sensitivity
Harmonic distortion
Nominal impedance
Crossover frequency
Recommended
amplifier power
Max. recommended
cable impedance
Dimensions
Net weight
шә?
DM"309
Nautilus” tweeter
Fiowport™
2/ғууау vented-box system
ix e25mm (1 іп) alloy dome high-frequency
1х el 30mm |(0.Оп) woven fibreglass cone bass/midrange
1x ei 30mm (Ө.біп| woven fibreglass cone bass
-6dB at 4ОНг and 42kH
60Hz ~ 22kHz «ЗаВ on reference axis
Within 2dB of reference response
Horizontal: over 40° arc
Vertical: over 10° arc
88dB spl (2.83V, 1m]
2nd and 3rd harmonics (9OdB, ini
«126 90Hz - 20kHz
ВО (minimum 3.09)
1 50Hz, 4kHz
25W — 120W into 8Q on unclipped programme
2,442
Height: 9 1 Omm 135.8іп)
Width: 201mm (7.9in}
Depth: 305mm [12in]
LISTER AND YOULL ЗЕЕ
B&W Loudspeakers Ша. reserves the right
Г; нЕ nd еі ще
i the specification without notice
; Н › ij ! i
кеге ttd. Printed in England. Е & OE.
>
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ВАМУ Loudspeakers Ltd, Meadow Road, Worthing, BNI 1 2RX, England
Me Те: +44 i01 1903 524801 Fax: +44 Ю 1903 52427925 www hwsnenkers cam
in line with technical developments.
E
| 915$} 058801