Руководство Bowers and Wilkins CCM20 Динамики

Руководство

1

INTRODUCTION

Thank you for purchasing Bowers and Wilkins

Contractor Ceiling Mount (CCM20) 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.

It is also our policy to make sure the advanced

features pioneered on one product are

incorporated into others we manufacture.

However, no matter how good the speakers

themselves, they must work well into the listening

room and time spent on planning the installation

will reap the reward of many hours listening

pleasure. Please read through this manual fully.

It will help you optimise the performance of

the system.

B&W distribute to over 60 countries worldwide

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.

Check the contents:

• 2x Baffle with drive units, crossover

• 2x Loudspeaker grille

• 1x Alignment template

• 2x Paint mask

We suggest you retain the packaging for future

use. Remove the grilles from the wall frames and,

to avoid damage, keep them in their plastic

bags (and preferably in the carton) away from

the work area until you are ready to fit them.

POSITIONING – NEW

CONSTRUCTION VERSUS RETROFIT

Check that there is no conflict with other

installations (pipe work, air conditioning, power-

cabling etc.). In existing construction, use a

stud-finding tool to map the construction

accurately and a pipe detector to scan the

proposed installation position. Avoid installing

the speakers in the same cavity as flimsy ducting,

which may be induced to rattle. The speakers

are designed to operate satisfactorily in a wide

range of cavity volumes, ideally above 15 litres

(0.5 cu ft).

The speakers are balanced for half-space

mounting (i.e. flush in a ceiling or soffit).

Placement near a wall/ceiling junction or in a

corner is to be avoided as it may give rise to too

much bass and a boomy quality to the sound.

If possible, keep the speakers more than 0.5m

(20in) from the ceiling edges.

The following sections give guidance on optimum

positioning, but this may be modified in line with

domestic constraints.

Normal Ceiling Applications

For distributed sound, mount the loudspeakers in

the ceiling. The spacing will depend on the

height of the ceiling and the level of sound

required. More speakers played at a lower level

will give better clarity.

Home Theatre Surround Speaker

Applications

The sound from surround speakers should be as

diffuse as possible. This ensures that the frontal

audio image is not distorted by changes of

listener position or head movements. The

speakers should generally be placed behind and

0.6m (2ft) or more above ear height. Ceiling

mounting often gives good results in this

application. The orientation is less important in

this application than in other cases.

WARNING: The CCM speakers produce a static

magnetic field that extends outside the cabinet

boundary. As such They 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.

DAMPING THE CEILING CAVITY

In addition, loosely fill the whole section of the

cavity with wadding. Fibreglass and mineral

wool matting supplied for heat insulation are

suitable, but not closed cell foam or expanded

polystyrene. Check that there is no debris that

may fall into the speaker (especially in ceiling

mount situations).

IMPORTANT: YOU SHOULD CHECK THAT THE

MATERIALS YOU USE MEET THE LOCAL FIRE

AND BUILDING REGULATIONS.

FITTING THE WALL FRAME

Existing Construction

Position the template on the ceiling as required

Mark around the outside of the template and cut

the aperture neatly.

All Methods

(figure 2)

Position the frame in the ceiling and screw in the

4 screws visible from the front of the frame.

These screws swing out clamping dogs that

locate behind the drywall. Ensure that they

have located properly and tighten the screws.

A certain amount of flexing of the frame is

allowed to take up unevenness in the mounting

surface, but do not over tighten the screws as

excessive distortion of the frame may occur.

CUSTOMISING

The frame has a paintable white semi-matte

finish, ready if necessary to be re-finished to

match your own decor. Fit the paint mask before

re-finishing. Do not re-finish the drive units or

baffle area behind the grille. Avoid touching the

drive units, as damage may result.

CONNECTIONS

All connections should be made with the

equipment switched off.

The terminals accept bare wires. Connect the

red (+ve) terminal to the positive terminal of

the amplifier and the black (-ve) to the negative.

Failure to observe correct polarity will result

in ill-defined panning of sounds and strange

phase effects.

When choosing cable, keep the total electrical

impedance (out and back) below the maximum

recommended in the specification. Ask your

dealer for advice, as the optimum cable will

depend on the length required. Cut off excess

length and tie down loose cable to prevent

rattles.

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