Mode d’emploi Bowers and Wilkins DM305 Haut-parleur

Mode d’emploi

1

INTRODUCTION

Thank you for purchasing B&W DM300 Series

speakers.

Since its foundation 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 has 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.

The rear panel of the DM™305 cabinet is

formed into a wedge pattern similar to the

interior of an anechoic chamber. This greatly

helps to break up the regular internal cabinet

volume that would otherwise encourage

coloration from internal standing waves.

Homogeneous fibre cone bass/midrange

drive units are used for minimum coloration

and maximum definition. The DM™305 also

features a soft dome tweeter with magnetic

fluid cooling to ensure good definition to the

limits of audibility and maintain dynamics to

high sound levels.

However, no matter how good the speakers

themselves, they must work well into the listening

room and time spent on the installation process

will reap the reward of many hours listening

pleasure. Please read through this manual fully.

It will help you optimise the performance of your

audio system.

B&W distribute to over 50 countries world-wide

and maintain a network of dedicated distributors

who will be able to help should you have any

problems your dealer cannot resolve.

UNPACKING

(figure 1)

• Fold the top carton flaps right back and invert

the carton and contents.

• Lift the carton clear of the contents.

• Remove the inner packing from the product.

• 4 spike feet and 4 lock nuts are taped in

recesses in one polystyrene end tray.

We suggest you retain the packaging for future

use.

CONNECTIONS

(figure 2)

All connections should be made with the

equipment turned off.

There are two pairs of terminals at the back of

each speaker, one pair to the bass unit and one

pair to the tweeter which permit bi-wiring or bi-

amplification if desired. On delivery, both pairs

are connected together by plated copper links

for use with a single twin cable.

Connect the positive terminal on the speaker

(marked + and coloured red) to the positive

terminal on the power amplifier and negative

(-, black) to negative (figure 2). Failure to

observe correct polarity will result in poor

sound balance and image focusing.

When bi-wiring the speakers, loosen the terminal

caps and remove the links. Use a separate twin

cable from the amplifier terminals to each pair of

speaker terminals (figure 3). Correct polarity

connection is even more critical in this case to

maintain the frequency response of each speaker

as well as the correct balance between left and

right speakers. The use of separate cables can

improve the reproduction of low-level detail by

reducing interaction in the crossover and

allowing optimum choice of cable for each

frequency range.

Always make sure all the terminal caps are

screwed down tight, as otherwise they may

rattle.

When choosing cable, keep the total electrical

impedance (out and back) below the maximum

recommended in the specification. In particular,

the cable to the tweeter should have low

inductance, otherwise the very high frequencies

will be attenuated. Ask your dealer for advice,

as the optimum cable will depend on the length

required.

POSITIONING

(figure 4)

Some experimentation with the position of the

speakers is well worthwhile to optimise the

interaction between them and the listening room.

However, as an initial guide:

Do not fit the spike feet until you have found the

best position for the speakers.

Place the speakers and the centre of the listening

area approximately at the corners of an

equilateral triangle.

Keep the speakers at least 1.5m (5ft) apart to

maintain left-right stereo separation.

Keep the speaker baffles at least 0.5m (20in)

clear of walls. Having the speakers too close

to walls increases the level of bass relative to

the midrange and may give a boomy quality

to the sound.

WARNING: The DM™305 produces a static

magnetic field that extends outside the cabinet

boundary. As such The DM™305 should not be

placed within 0.5m (20in) of equipment that

may be affected by such a field, e.g. Cathode

Ray Tubes in TVs and Personal Computers.

FINE TUNING

Before fine tuning the installation, double check

the polarity and security of the connections.

If the level of bass is uneven with frequency, this

is usually due to strong excitation of resonance

modes in the room.

Even small changes in the position of the

speakers within the listening room can have a

profound effect on the perceived sound quality

by altering the excitation of these modes. Try

mounting the speakers along a different wall.

Even moving large pieces of furniture about can

have an effect.

If the general level of bass is too high, try

moving the speakers further away from the

walls. Conversely, if you need more bass,

move the speakers closer to the walls.

Space behind the speakers also improves

the impression of perspective on well recorded

material.

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 listening

area (figure 5).

If the sound is too harsh, increase the amount

of soft furnishing in the room. For example, use

heavier curtains. 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 surfaces such as bookshelves

and large pieces of furniture.

Ensure the speakers stand firmly on the floor.

Whenever possible fit the spike feet supplied

after you have optimised the positioning. These

are designed to 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 cabinet. If

the cabinet rocks, unscrew the two spikes that do

not touch the floor equally until the cabinet sits

firmly on the floor, and lock them in place by

tightening the lock nuts against the cabinet. If

there is no carpet and you wish to avoid

scratching the floor surface, use a protective disc

between the spike and the floor.

AFTERCARE

The vinyl veneers normally only require 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 after

removing the grille from the cabinet.

Avoid touching the drive units, especially the

tweeter, as damage may result.

Évaluation

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