Руководство Bowers and Wilkins Signature SCM Динамики

Руководство

precise imaging to the sides and rear. More

modern 5.1 channel recordings of both

movies and audio have discrete left and

right surround channels, which can convey

more precise imaging. However, images to

the sides and rear are not generally as

precise as can be obtained at the front.

Sustained tones can be more readily

positioned between the speakers than

percussive sounds, which have a tendency

to collapse towards the speakers. It is also

difficult to maintain image position for all

listeners if the listening area is a significant

proportion of the area between the five

speakers. Image stability depends on

getting the right balance between all five

speakers and the ‘hot spot’ effect is even

more marked than for 2-channel audio.

With this in mind, your success in

recreating the producer’s intentions for the

surround field will depend to a great extent

on domestic constraints – how free you are

to position the speakers in an ideal position

and how large an audience you want to

cater for, relative to the size of the room.

There is no industry standard for the angle

subtended by the surround speakers at the

listening position, but most recordings are

made with the surround speakers

positioned between 110° and 130° from

front centre. Place the speakers against the

wall within this range of angles, initially on a

temporary support that raises the tweeters

approximately to ear height. This will define

whether you position the speakers on the

side or rear wall. Point the speakers

towards the centre of the listening area.

(figure 4) The wall bracket will allow the

speaker to be rotated horizontally up to

45°. If you listen in high-backed chairs, or if

the speakers are otherwise obscured, it

may be advantageous to raise them higher.

Satisfactory results can be obtained with

them up to approximately 60cm (2 feet)

above ear height.

With all speakers positioned for initial

listening tests, listen to a wide variety of

programme material – 5.1 channel audio,

action and small scale movies – and sit in

all likely listening positions. Pay particular

attention to the surround information and

the stability of the images.

If the imaging is unsatisfactory, for example

if it becomes too one sided at the extremes

of the listening area, or if you cannot place

the speakers within the preferred range,

you may be better off aiming for a more

diffuse sound field. This can give more

acceptable results in difficult situations. Try

changing the angle of the speakers so they

point away from the listening area. It may

also be advantageous to raise the speakers

well above ear height. (figure 5)

Once you have found the optimum position,

fix the speaker permanently in position (see

below).

As a front centre speaker:

If using a projection television with an

acoustically transparent screen, place the

speaker behind the centre of the screen.

Otherwise position it directly above or

below the screen, whichever is closest to

ear level.

As a front left and right speaker:

Space the speaker between 0.5m (20 in)

and 1m (40 in) from the side of the screen.

If the centre speaker is behind an

acoustically transparent screen, position

the left and right front speaker as nearly as

possible at the same height. If the centre

speaker is above or below the screen, the

height of the left and right speaker should

be between the height of the centre

speaker and the centre of the screen.

Adjust the angle of the speakers to achieve

the most realistic and stable image.

For greatest realism in home theatre

installations it is important to balance the

speakers and adjust the acoustic image to

match the size of the screen. With smaller

screens it may be more realistic to have the

left and right speakers closer together than

you might for audio alone.

Adjust the levels of the three front speakers

to get a smooth transition of sounds as

they pan across the screen. Adjust the level

of the surround speakers so that, except

for special effects, your attention is not

unduly attracted to them.

Sit in all likely listening positions when

deciding on the optimum levels.

Consult your decoder manual for further

information on how to set the levels.

2-Channel Audio

Mount the speakers so that the tweeters

are approximately at ear level.

As an initial guide: (figure 6)

• Position the speakers and the centre of

the listening area approximately at the

corners of an equilateral triangle.

• Keep the speakers at least 1.5m apart

to maintain left-right separation.

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 7)

Fine Tuning

Before fine tuning, double check that all the

connections in the installation are correct

and secure.

If the sound is too harsh, increase 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.

For the most discerning listening, remove

the cloth covered grille as described below

in the section ‘Aftercare’. The tweeter is

very delicate and its grille should be left in

position for protection. For this reason the

grille retaining ring is designed to provide

the optimum acoustic environment for the

unit and the response is less smooth with

the grille removed.

Running-in period

The performance of the speaker will change

subtly during the initial listening period. If

the speaker has been stored in a cold

environment, the damping compounds and

suspension materials of the drive units will

take some time to recover their correct

mechanical properties. The drive unit

suspensions will also loosen up during the

first hours of use. The time taken for the

speaker to achieve its intended

performance will vary depending on

previous storage conditions and how it is

used. As a guide, allow up to a week for

the temperature effects to stabilise and

60 hours of average use for the mechanical

parts to attain their intended design

characteristics.

Assembling and fixing the

bracket

Screws and plugs for fitting to the wall are

not supplied. Use round head screws with

a maximum body diameter of 5.0mm (0.20

in) and a maximum head diameter of 11mm

(0.4 in).

Drill and plug two holes in the wall, 150mm

(5.9 in) above where the bottom of the

speaker cabinet will be and horizontally

spaced by 44mm (1.73 in). (figure 8a) Take

special care, especially if fitting into drywall

panels, that the screws and plugs can

support the combined weight of the

speaker and bracket. Insert the screws into

the wall leaving the head 16mm (0.6 in)

clear of the surface. (figure 8b)

Assemble the support plate to the wall

plate using the four M5 screws and the

4mm Allen key. (figure 9a)

Feed the M8 screw through the slot in the

support plate into the threaded insert in the

bottom panel of the enclosure, using the

6mm Allen key. (figure 9b) Initially, position

the screw at the end of the slot furthest

from the wall plate so that the keyhole slots

are clearly visible.

Connect the cables to the speaker and

hook the wall plate over the screws in the

wall.

Adjust the speaker to be as close to the

wall as possible, commensurate with the

angle of rotation.

Should you need to adjust the vertical

angle of the speaker, we recommend you

use an OmniMount 30.0 Series wall bracket

in place of the one supplied. It may be

fitted to the additional 4 threaded inserts in

the base of the speaker.

Ancillary equipment

Speakers of this ability deserve signals of

the highest quality. Choose your electronic

equipment and interconnecting cables with

care. We can give guidance on what to

look for when choosing ancillary

equipment, but cannot recommend specific

items. The standards of such products are

improving all the time and your dealer will

be able to demonstrate a variety of suitable

up-to-date products.

In the specification we recommend a range

of amplifier powers. The higher figure is

defined by the power handling capability of

3

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