Mode d’emploi Bowers and Wilkins Nautilus 801 Haut-parleur

Mode d’emploi

because you do not want to see a

multitude of cables in the room, short

cables are provided to link both positive

and both negative speaker terminals

together.

When using the links, insert the spade into

the slot in the side of one terminal and the

crimped pin into the round side hole in the

other. There is enough clearance to insert a

spade connector from the amplifier into the

same terminal as the crimped pin.

Ensure each positive terminal on the

speaker (coloured red) is connected to the

positive output terminal of the amplifier and

negative (coloured black) to negative.

Incorrect connection can result in poor

imaging and loss of bass.

When bi-wiring, do not use the linking

cables. Take extra care with the polarity of

the connections as incorrect connection

can also impair the frequency response

through the bass-midrange crossover and,

if the links are left in place, may cause

damage to the amplifier by shorting its

output terminals.

Fine tuning

Before fine tuning, double check that all the

connections in the installation are correct

and secure.

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 the 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 4)

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 bass and midrange grilles 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 15

hours of average use for the mechanical

parts to attain their intended design

characteristics.

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

the speaker. When calculating the power

handling, it is assumed that the amplifier is

not run into clipping, which distorts the

frequency power spectrum of the signal,

and that the signal is normal programme

material. Test tones from oscillators and the

like are not applicable. The lower figure is

the minimum we consider necessary to

achieve reasonable listening levels without

audible distortion in the smaller room (less

than 60 m

3

or 2000 cu ft). The higher the

power you use, the less likely you are to

experience amplifier clipping. You can often

tell how good an amplifier is at driving

complex speaker loads by looking at its

power rating into both 4Ω and 8Ω loads.

The nearer the ratio is to 2:1 the better, as

it indicates a good current capability.

In order to reduce the effect the cable has

on the frequency response of the speaker

to inaudible levels, the impedance of the

cable at all frequencies (measuring both

positive and negative conductors in series)

should be kept as low as possible and

certainly below 0.1Ω. At low frequencies,

the DC resistance of the cable is the

dominant factor and you should choose a

gauge of wire sufficient to achieve the

impedance requirements over the length of

cable you need to use. At mid and high

frequencies the inductive component of the

impedance can dominate the DC

resistance. This and other properties

influenced by the detailed construction of

the cable become important. Ask your

dealer for advice on the best cable for your

needs.

Aftercare

The bass cabinet surface usually only

requires dusting, but the gloss surface of

midrange and tweeter housings will benefit

from the use of an anti-static cleaner. If you

wish to use an aerosol cleaner, remove the

cloth covered grilles first and spray onto

the cleaning cloth, not directly onto the

cabinet. Do not attempt to remove the

tweeter grille.

Remove both cloth covered grilles by

gripping at the outer edges and gently

pulling away from the cabinet. To replace

the bass grille, locate the pegs in the holes

in the bass unit trim ring (Nautilus™801) or

the cabinet (Nautilus™802) and push into

place. To replace the midrange grille, locate

the central peg in the hole in the tip of the

bullet shaped dispersion modifier at the

centre of the drive unit and push the centre

of the grille firmly. The outer rim of the grille

is held in place by spring tension in the

spokes of the grille fret.

The grille fabric may be cleaned with the

brush provided while the grille is detached

from the cabinet.

Avoid touching the drive unit diaphragms,

especially the tweeter, as damage may

result.

2

Évaluation

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