Manuale Bowers and Wilkins CM4 Altoparlante

Manuale

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

contact B&W national distributor in the

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.

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.

• We suggest you retain the packing for

future use.

Check in the carton for:

• 4 Spike feet with lock nuts

• 2 Foam bungs

• 1 International warranty booklet

Connections (Figure 2 & 3)

All connections should be made with the

equipment switched off.

There are 2 pairs of terminals at 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 a 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) to 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-frequency detail. Observe

the correct polarity as before. When bi-

wiring, incorrect connection can also impair

the frequency response.

The terminals accept bare wire. Always

make sure terminals are screwed down

tight as otherwise they may rattle.

Ask your dealer for advice when choosing

cable. Keep the total impedance below the

maximum recommended in specification

and use a low inductance cable to avoid

attenuation of the highest frequencies.

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 midrange and may give a

boomy quality to the sound.

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.

Fine tuning

Before fine tuning, make sure that all the

connections in the installation are correct

and secure.

If the level 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 large pieces of furniture can

have an effect.

Moving the speakers further from 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.

If you want to reduce the bass level without

moving the speakers further from the wall,

fit the foam bungs in the port tubes.

(Figure 6)

If the central image is poor, try moving the

speakers closer together or toeing them in

so they point just in front of the listeners.

(Figure 5)

If the sound is too harsh, increase the

amount of soft furnishings 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

1

Valutazione

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