Bowers & Wilkins ASW 10CM: English

7276 10 CM manual revised.qxd 27/3/09 10:11 Page 4

1

8. When replacement parts are required, be sure the

English

service technician has used replacement parts

s

pecified by the manufacturer or have the same

Owner’s manual

characteristics as the original part. Unauthorised

s

ubstitutions may result in fire, electric shock or

o

ther hazards.

Important Safety Instructions

1. Read these instructions.

1

9. Check that there are no cables under the carpet

that may be damaged by the spike feet. Do not

2. Keep these instructions.

w

alk the product on the spike feet as this may

3. Heed all warnings.

cause them to become detached from the cabinet

and cause damage. Take care not to impale

4. Follow all instructions.

y

ourself with the spike feet.

5. Do not use this apparatus near water.

20. For continued protection against fire hazard, use

6. Clean only with dry cloth.

fuses only of the correct type and rating. Mains

7. Do not block any ventilation openings. Install in

f

uses are located inside the appliance as well as

accordance with the manufacturer’s instructions.

on its back panel. Replacement of the internal

fuse should be entrusted to an authorised

8. Do not install near any heat sources such as

operative. User-replaceable fuse types are shown

radiators, heat registers, stoves, or other

in the specification.

apparatus (including amplifiers) that produce heat.

21. Isolation of the appliance from the power supply is

9. Do not defeat the safety purpose of the polarized

by means of removal of the power cord from the

or grounding-type plug. A polarized plug has two

rear of the appliance or removal of the power cord

blades with one wider than the other. A grounding

from the wall power outlet. Either the wall outlet or

type plug has two blades and a third grounding

the rear of the appliance must remain freely

prong. The wide blade or the third prong are

accessible at all times while the apparatus is in use.

provided for your safety. If the provided plug does

not fit into your outlet, consult an electrician for

22. This product should be operated only from the

replacement of the obsolete outlet.

type of power source indicated by the marking

adjacent to the power cord entry. If you are not

10. Protect the power cord from being walked on or

sure of the type of power supply to your home,

pinched particularly at plugs, convenience

consult your product dealer or local power

receptacles, and the point where they exit from

company.

the apparatus.

23. Do not overload wall outlets, extension cords or

11. Only use attachments/accessories specified by the

integral convenience receptacles, as this can

manufacturer.

result in a risk of fire or electric shock.

12. Use only with the cart, stand, tripod,

24. Magnetic fields – The product creates a stray

bracket, or table specified by the

static magnetic field. Do not place any object that

manufacturer, or sold with the

may be damaged by this magnetic field (eg

apparatus. When a cart is used, use

cathode ray tube televisions or computer

caution when moving the

monitors, audio and video tapes and swipe cards)

cart/apparatus combination to avoid injury from

within 0.5m (2 feet) of the appliance. The

tip-over.

appliance may cause distortion of cathode ray

13. Unplug this apparatus during lightning storms or

tube images beyond this distance. LCD and

when unused for long periods of time.

Plasma screens are not affected.

14. Refer all servicing to qualified service personnel.

25. Mounting – Do not place this product on an

Servicing is required when the apparatus has been

unstable stand, tripod, bracket or table. The

damaged in any way, such as power-supply cord

product may fall causing serious injury and serious

or plug is damaged, liquid has been spilled or

damage. Any mounting of the product should

objects have fallen into the apparatus, the

follow the manufacturer’s instructions.

apparatus has been exposed to rain or moisture,

does not operate normally

, or has been dr

opped.

CAUTION

15. Do not expose this apparatus to dripping or

RISK OF ELECTRIC SHOCK

splashing and ensure that no objects filled with

DO NOT OPEN

liquids, such as vases, are placed on the

apparatus.

A

VIS:

RISQUE DE CHOC ELECTRIQUE – NE P

AS OUVRIR

16. To completely disconnect this apparatus from the

AC Mains, disconnect the power supply cord plug

The presence of this symbol on the product warns the

fr

om the AC r

eceptacle.

user that ther

e is a risk of danger

ous electrical shock if

17. The mains plug of the power supply cord shall

the product is opened beyond the point at which the

remain readily operable.

symbol appears. There are no user serviceable parts

inside. Leave servicing to qualified personnel.

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7276 10 CM manual revised.qxd 27/3/09 10:11 Page 5

T

he lightning flash with arrowhead

t

hought in installation if they are to reach their full

symbol within an equilateral triangle, is

performance potential and this manual will guide you

i

ntended to alert the user to the

t

hrough the process.

presence of uninsulated “dangerous

T

he subwoofer requires connection to the mains

v

oltage” within the product's enclosure

power supply, so it is important that you familiarise

t

hat may be of sufficient magnitude to

y

ourself with the safety instructions and heed all the

constitute a risk of electric shock to

w

arnings. Keep this manual in a safe place for future

p

ersons.

reference.

T

he exclamation point within an

The Subwoofer Connection and Control

equilateral triangle is intended to alert

Panel

(Figure 1)

the user to the presence of important

1. Status indicator.

o

perating and maintenance (servicing)

instructions in the literature

2. On, Auto, Stand-by switch.

accompanying the product.

3. Line-level input volume.

W

ARNING: To reduce the risk of fire or electric

4. Speaker level input volume.

shock, do not expose this apparatus to rain or

moisture.

5. Low-pass filter frequency.

Do not expose the device to rain, use it near water or

6. Low-pass filter selection switch.

in damp or wet conditions, or place containers on it

7. Bass extension switch.

containing liquids which might spill into any openings.

8. Equalisation switch.

When setting up the device, make sure that the AC

9. Phase reverse switch.

outlet you are using is easily accessible. If some

trouble or malfunction occurs, immediately turn off the

10. 12V trigger input.

power switch and disconnect the plug from the outlet.

11. Line level input sockets (left and right).

Even when the power switch is turned off, electricity is

still flowing to the product at the minimum level. When

12. Speaker level input binding posts (left and right).

you are not using the device for a long time, make

13. Mains input.

sure to unplug the power cord from the wall AC outlet.

14. External fuse holder.

Introduction

Subwoofer Applications

Dear customer,

The primary function of a subwoofer is to reproduce

Thank you for choosing Bowers & Wilkins. Please read

signals from an audio-visual processor Low Frequency

this manual fully before unpacking and installing the

Effects (LFE) channel. In addition, the processor may

product. It will help you to optimise its performance.

be configured to divert the low bass portion from

B&W maintains a network of dedicated distributors in

some or all of the other channels and add it to the LFE

over 60 countries who will be able to help you should

information. This is usually done by selecting “small”

you have any problems your dealer cannot resolve.

loudspeakers in the processor set-up procedure.

Environmental Information

In 2-channel audio applications a subwoofer is used to

All B&W products are designed to comply

extend the bass response lower than that provided by

with international directives on the

the satellite speakers. The subwoofer low-pass filter

Restriction of Hazardous Substances

should be set so that the subwoofer takes over as the

(RoHS) in electrical and electronic equipment and the

output of the satellite speakers falls.

disposal of Waste Electrical and Electronic Equipment

Subwoofer Positioning and Installation

(WEEE). These symbols indicate compliance and that

the products must be appropriately recycled or

The ear poorly perceives the source location of low

processed in accordance with these directives. Consult

frequency sound so the position of subwoofers in the

your local waste disposal authority for guidance.

listening room is generally less critical compared to

full-range speakers. However, best results are usually

Carton Contents

obtained if the subwoofer is placed between the left

Check in the carton for:

and right speakers or in the vicinity of one of them. If

two subwoofers are used, it is best to put one near

1 Mains cable

the left and one near the right speaker

. Placing a

1 Accessory pack containing:

subwoofer behind the listening position, even in multi-

4 M6 spike feet

channel surround sound installations, generally results

4 M6 rubber feet

in inferior imaging, but may be an acceptable

4 Lock nuts (10mm acr

oss flats)

compr

omise if domestic considerations dictate.

Installation

As with all speakers, the proximity of room boundaries

The subwoofer has been designed both for Home

affects the sound of a subwoofer. Bass volume

Theatre installations and to augment the bass

incr

eases as mor

e surfaces come into close pr

oximity

performance of ‘full range’ speakers in 2-channel

with the speaker

. Unlike full-range speakers, however,

audio systems. All audio installations require some

the overall system balance can be corrected by

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7276 10 CM manual revised.qxd 27/3/09 10:11 Page 6

a

djusting the volume level of the subwoofer. The more

a

ccept both line level signals via the RCA Phono

boost gained from the room, the lower the volume can

sockets (Item 11 in Figure 1) and speaker level signals

b

e set and the less hard the subwoofer has to work;

v

ia the binding posts (Item 12 in Figure 1). Use the

but there is a down side. Subwoofers positioned near

following guide to select the appropriate connection

c

orners often generate more low-frequency room

m

ethod for your installation:

r

esonances, making the bass more uneven with

A

pplication: Home Theatre

frequency. There is no substitute for experiment as all

r

ooms behave differently, so the subwoofer should be

S

ubwoofer connected to AV Processor with separate

t

ried in a variety of positions before a final decision is

power amplifiers: Figure 2

made. A piece of music with a bass line ascending or

S

ubwoofer connected to AV Processor with integrated

d

escending the musical scale is useful for assessing

power amplifiers:

the smoothness of the bass response. Listen for

• using line-level inputs: Figure 3

e

xaggerated or quiet notes.

• using speaker level inputs: Figure 4

If the subwoofer is to be used in a confined space

(e.g. built into furn

iture), the space must be ventilated

N

ote:

T

he subwoofer is always better connected via

t

o allow sufficient air to circulate and cool the unit. Ask

i

ts line level inputs in home theatre applications.

your dealer for advice.

Application: 2-channel audio

The subwoofer is intended to be floor mounted only. It

Subwoofer connected to Integrated Amplifier:

is important to ensure the subwoofer stands firmly on

the floor using the spike feet supplied whenever

• using line-level inputs: Figure 5

possible. The spike feet are designed to pierce carpet

• using speaker level inputs: Figure 6

and rest on the floor surface. Initially, screw the lock

Two Subwoofers connected to Integrated Amplifier:

nuts onto the spikes enough to leave the nuts floating

just above the carpet when the spikes are resting on

• using line-level inputs: Figure 7

the floor beneath. Screw the spikes fully into the

• using speaker level inputs: Figure 8

threaded inserts in the base of the cabinet. If the

cabinet rocks when placed on the floor, unscrew the

Subwoofer connected to Pre/Power Amplifier:

two spikes that do not touch the floor until the cabinet

• using line-level input: Figure 9

rests firmly without r

ocking. Finally, lock the nuts

against the cabinet. It may be more convenient to fit

• using speaker level inputs: Figure 10

and adjust the spike feet after speaker positioning has

Two Subwoofers connected to Pre/Power Amplifier:

been optimised.

• using line-level inputs: Figure 11

If there is no carpet and you wish to avoid scratching

• using speaker level inputs: Figure 12

the floor surface, use either a protective metal disc (a

coin perhaps) between the spike and the floor or use

Before Auditioning

the supplied rubber feet. Fit the rubber feet by

Before auditioning your new subwoofer installation and

screwing one into each of the holes in the underside

fine-tuning it, double check the connections. Make

of the cabinet.

sure in particular that:

The grille fitted to the front of the subwoofer may be

1. The phasing is correct. If the speaker level inputs

removed if desired. Take care however not to touch

are used, ensure that the positive terminals on the

the moving parts of the drive unit as damage may

subwoofer (marked + and coloured red) are

result.

connected to the positive output terminals on the

Using Multiple Subwoofers

amplifier and that the negative terminals on the

subwoofer (marked – and coloured black) are

Using multiple subwoofers in a single installation can

connected to the negative output terminals on the

improve performance in the following ways:

amplifier. Incorrect connection can result a

• Maintain stereo separation to the lowest

confused sound with poor bass.

frequencies.

2. Left to right channels are not confused. Left/right

• Smooth out the effects of low frequency room

confusion can result for example in orchestral

resonances.

elements appearing in the wr

ong place in the

• Enable a higher maximum sound output.

stereo image, or Home Theatre sound effects not

matching the action on scr

een.

In the case of two subwoofers used in a

2-channel audio system, stereo separation will only be

Switching On and Of

f

improved if each channel has its own subwoofer

Subwoofers ar

e best switched on after any other item

located close to the appr

opriate satellite speaker

.

and switched off first. The On/Auto/Standby switch

(Item 2 in Figure 1) and Status Indicator (Item 1 in

Electrical Connections

Figur

e 1) operate as follows:

Disconnect all audio system equipment from the mains

until the signal connections have been made and

On: W

ith the switch to On, the subwoofer will r

emain

checked. This avoids the risk of damage whilst

fully active and the indicator will glow green.

connections are made or broken. The subwoofer can

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