Bowers & Wilkins ASW2000: инструкция

ASW2000

OWNER’S MANUAL

ASW2000 Owner’s manual

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Figure 1

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Figure 2

2

6

4

5

11

LINK

LINE

PHASE

LOW–PASS VOLUME

POWER

OUT

LINE

IN

OUT

L

ON

60

70

0 180

50

AUTO

R

80

7

10 0

OFF

14040

MIN MAX

TO SPEAKERS FROM AMPLIFIER

3

RIGHT

LEFT

RIGHT LEFT

™

ASW

2000

ACTIVE SUBWOOFER

1

1

WARNINGS:

TO PREVENT FIRE OR SHOCK HAZARD DO NOT EXPOSE THIS UNIT TO RAIN OR MOISTURE

NO USER SERVICEABLE PARTS INSIDE REFER SERVICING TO QUALIFIED PERSONNEL

ATTENTION:

POUR EVITER TOUS RISQUES DE FEU OU DE CHOC ELECTRIQUE

AUCUN COMPOSANT NE PEUT ETRE REMPLACE PAR L’UTILISATEUR

N’EXPOSEZ PAS CET APPAREIL A L’HUMIDITE

VEUILLEZ CONTACTER LE SERVICE APRES VENTE AGREE

9

ATTENTION: VOIR LE CAHIER D'INSTRUCTIONS

CAUTION: SEE OPERATING MANUAL

B&W LOUDSPEAKERS LTD

WORTHING ENGLAND

12

8

10

Figure 3

Figure 4

1

Figure 5

Figure 6

2

Figure 7

Figure 8

3

Figure 9

Figure 10

4

GB

8 Ventilation – The appliance should be

Safety Instructions

Warnings:

situated so that its location or position does

not interfere with its proper ventilation. For

To prevent fire or shock hazard, do not expose

example, the appliance should not be

this equipment to rain or moisture.

situated on a bed, sofa, rug, or similar

Observe all warnings on the equipment itself.

surface that may block the ventilation

To avoid electrical shock, do not open the

openings; or placed in a built-in installation,

enclosure or remove the amplifier from the

such as a bookcase or cabinet, that may

Caution:

rear panel. There are no user serviceable

impede the flow of air through the ventilation

parts inside. Refer all service questions to an

To reduce the risk of electric shock, do not

openings.

authorised B&W dealer.

remove the back panel. No user-serviceable

9 Heat – The appliance should be situated

parts inside. Refer servicing to qualified

To prevent electric shock, do not use this

away from heat sources such as radiators,

personnel.

(polarised) power plug with an extension cord

heat registers, stoves, or other appliances

receptacle or other outlet unless the blades can

that produce heat.

Explanation of Graphical Symbols

be fully inserted to prevent blade exposure.

10 Power Sources – The appliance should be

Ensure that the voltage indicated on the amplifier

connected to a power supply only of the

panel matches that of the power supply.

type described in the operating instructions

or as marked on the appliance.

The mains fuseholder is located on the back

panel of the amplifier module. Replacement fuse

11Grounding or Polarisation – The appliance

must be of the same type and rating as supplied.

is double insulated and should not be

The lightning flash within an equilateral triangle

grounded. When using an extension power-

The equipment should not be earthed (grounded)

is intended to alert you to the presence of unin-

supply cord or a power-supply cord other

To ensure adequate cooling of the amplifier,

sulated "dangerous voltage" within the product's

than that supplied with the appliance, it

operate the equipment only with the heatsink fins

enclosure that may be of sufficient magnitude to

should be 2-core, fitted with the appropriate

aligned vertically.

constitute an electric shock to persons.

moulded-on plugs and carry safety approval

appropriate to the country of use.

Important for UK only:

12 Power Cord Protection – Power-supply cords

The wires in this mains lead are coloured in

should be routed so that they are not likely to

accordance with the following code:

be walked on or pinched by items placed

on or against them, paying particular

blue: neutral

attention to cords at plugs, convenience

brown: live

The exclamation point within an equilateral

receptacles and the point where they exit

As the colours of the wires in the mains lead of

triangle is intended to alert you to the presence

from the appliance.

this apparatus may not correspond with the

of important operating and maintenance

13 Cleaning – The appliance should be

coloured markings identifying the terminals in

(servicing) instructions in the literature

cleaned only as recommended by the

your plug, proceed as follows:

accompanying the appliance.

manufacturer.

The terminal in the plug which is marked

14 Non-use Periods – Tthe power cord of the

with the letter E, or by the earth symbol, or

1 Read instructions – All the safety and

appliance should be unplugged from

coloured green or green and yellow must be

operating instructions should be read before

the outlet when left unused for a long

left unconnected.

the appliance is operated.

period of time.

The wire which is coloured blue must be

2 Retain instructions – The safety and operating

15 Object and Liquid Entry –- Care should be

connected to the terminal which is marked with

instructions should be retained for future

taken so that objects do not fall and liquids

the letter N or coloured black.

reference.

are not spilled into the enclosure through

The wire which is coloured brown must be

openings.

3 Heed warnings – All warnings on the

connected to the terminal which is marked with

appliance and in the operating instructions

16 Damage Requiring Service –- The appliance

the letter I or coloured red.

should be adhered to.

should be serviced by qualified personnel

The subwoofer is heavy and bulky, it should be

when:

4 Follow instructions – All operating and use

moved or lifted by at least two people.

instructions should be followed.

a The power-supply cord or the plug has

Check that there are no cables under the carpet

been damaged; or

5 Water and moisture – The appliance should

that may be damaged by the spikes.

b Objects have fallen, or liquid has been

not be used near water - for example, near

spilled into the appliance; or

Do not walk the unit on the spikes as this may

a bathtub, washbowl, kitchen sink, laundry

c The appliance has been exposed to rain; or

cause them to become detached from the

tub, in a wet basement, or near a swimming

d The appliance does not appear to operate

cabinet and cause damage.

pool and the like.

normally, or exhibits a marked change in

Take care not to spike through your own feet.

6 Carts and Stands – The appliance should be

performance; or

used only with a cart or stand that is

e The appliance has been dropped, or the

recommended by the manufacturer

enclosure damaged.

7 Wall or Ceiling Mounting – The appliance

17 Servicing – The user should not attempt to

should be mounted to a wall or ceiling only

service the appliance beyond that described

as recommended by the manufacturer.

in the operating instructions. All other

servicing should be referred to qualified

service personnel.

5

Introduction

A tour of the subwoofer (figure 2)

Electrical connections

Thank you for purchasing the B&W ASW2000

Disconnect all sound system equipment from the

1 Heatsinks

Active Subwoofer.

power supply until the signal connections have

2 Line level connectors

been made and checked. This avoids the risk of

Since its foundation in 1966, the continuing

3 Speaker level connectors

damage whilst connections are made or broken.

philosophy of B&W has been the quest for

4 Low-pass filter frequency control

perfect sound reproduction. Inspired by the

5 Volume control

The function of the subwoofer is to receive

company’s founder, the late John Bowers, this

6 Phase switch

signals from the amplification chain and, where

quest has entailed not only high investment in

7 On/Auto/Off switch

necessary split the signal into low bass and

audio technology and innovation but also an

8 Power cord

higher frequencies and feed the latter back out

abiding appreciation of music and the demands

9 Voltage rating label

to the satellite speakers. Left and right channel

of film sound to ensure that the technology is put

10 Fuseholder

inputs may be combined into a single mono low

to maximum effect.

11 Power/Standby indicator

bass feed to the subwoofer drive unit if required.

12 Toroidal mains transformer housing

The ASW2000 has been designed for home

The subwoofer will input and output both line

theatre installations and to augment the bass

level signals via the RCA Phono sockets and

Positioning the subwoofer

performance of ‘full range’ speakers in stereo

speaker level signals via the 4mm binding posts

audio use. Adding the subwoofer to your

Because the subwoofer produces only low-

located on the back panel, giving a flexible

system not only extends the bass to lower

frequency sounds, positioning is less critical in

choice of connection methods. However, you

frequencies, it improves the midrange clarity

some respects compared to full-range speakers.

must not use a mixture of line level and speaker

by reducing the low-frequency demands on

Directional information is much less precise and

level connections in the same installation. If you

your existing speakers.

you have more choice where to place the

have a choice between line level and speaker

speakers to good effect. This said, best results

level connections, choose line level.

The subwoofer is magnetically shielded for use

are obtained if the subwoofer is placed between

close to a television screen.

Use the following table to select the correct

the satellite speakers or in the vicinity of one of

wiring method for your installation:

Please read through this manual fully before

them. If you use two subwoofers, it is best to put

using the subwoofer. All sound installations

one near each satellite speaker.

Application:

require some planning and experimentation if

Placing the subwoofer behind the listeners, even

you are to get the best out of the products used

in surround sound installations, generally gives

Home Theatre:- Equipment:

and this manual will guide you in this process.

inferior imaging; but may be an acceptable

• Decoder with separate power amplifiers:

As the subwoofer is connected to the electricity

compromise if domestic considerations dictate.

power supply, it is important that you familiarise

a With subwoofer output: Connections: fig. 3

As with all speakers, the proximity of room

yourself with the safety instructions and heed

b No subwoofer output: Connections: fig. 4

boundaries affects the sound. Bass is generally

all warnings.

increased as more surfaces come into close

•

Decoder with integrated power amplifiers:

Keep this manual in a safe place for future

proximity with the speakers. Unlike full-range

a With subwoofer output: Connections: fig. 5

reference.

speakers, however, you can always restore the

b No subwoofer output: Connections: fig. 6

correct overall system balance by adjusting the

B&W loudspeakers are distributed to over 50

volume level of the subwoofer. The more boost

countries world-wide and we maintain an

Application:

you get from the room, the less hard the speaker

international network of carefully chosen and

has to work; but there is a down side. Corner

dedicated distributors. If you have a problem

Stereo Audio:- Equipment:

positions often excite more low-frequency room

which your dealer cannot resolve, our distributors

resonances, making the bass more uneven with

• Separate pre- & power amplifiers:

will be more than willing to assist you.

frequency. There is no substitute for experiment

a One or more subwoofers with output

as all rooms behave differently, so try the

Unpacking (figure 1)

combined into a single mono signal:

subwoofer in a variety of positions before

Connections: fig. 7

The easiest way to unpack the subwoofer and

making a final decision. A piece of music with

b Two subwoofers with separate left and right

avoid damage is as follows:

a bass line ascending or descending the musical

signals: Connections: fig. 8

scale is useful for assessing the smoothness of

• Open the carton flaps right back and invert

the bass response. Listen for exaggerated or

• Integrated amplifier:

the carton and contents.

quiet notes. Having a separate subwoofer does

a One or more subwoofers with output

•

Lift the carton away from the product.

enable you to optimise for room resonances

combined into a single mono signal:

independently from siting the satellite speakers

•

We recommend that you retain the packaging

Connections: fig. 9

for best imaging.

for future use.

b Two subwoofers with separate left and

If the subwoofer is to be used in a confined

right signals: Connections: fig. 10

In addition to this manual, the carton

space (eg in custom furniture), the space must be

should contain:

ventilated to allow sufficient air to circulate and

Using more than one subwoofer

•

1 Subwoofer

cool the unit. Ask your dealer for advice.

• Using more than one unit in a single

•

1 Accessory pack containing:

The subwoofer is supplied with four spike feet.

installation can improve performance in the

•4 Spikes with lock nuts

The spikes pierce through carpet pile, giving a

following ways:

•

4 Self-adhesive rubber feet

firm support directly to the floor surface without

•Maintain stereo separation to the lowest

crushing the pile. When fitting spikes, first screw

frequencies.

the lock nuts fully onto the spikes, then screw the

spikes fully onto the threaded inserts in the base

•

Cope with larger listening rooms.

of the cabinet. If the unit rocks, loosen the

•

Enable greater maximum sound output – often

relevant two opposing spikes until the support is

useful for effectively reproducing special effects

firm, then re-tighten the lock nuts to the inserts. If

in Home Theatre applications. Smooth out the

the unit is to be placed on a vulnerable surface,

effects of low-frequency room resonances.

either place a protective disc under each spike

6

or fit the four rubber pads in place of the spikes.

If you are using two subwoofers for stereo audio,

• Set the VOLUME control to the half-way

At each setting of the cut-off frequency, listen with

stereo separation is improved if each channel

(12 o’clock) position (this is a standard THX

the phase switch in both positions. The correct

has its own subwoofer, providing each one is

pre-set level)

one is that which gives the fullest bass and that

sited close to the relevant satellite speaker.

will depend on the bass characteristics of your

• Set the PHASE switch initially to 0°, then see

satellite speakers and the relative distances of

If the subwoofers cannot be ideally sited, or if

the section below on fine tuning.

the subwoofer(s) and the satellite speakers to the

you are using a dedicated subwoofer output

Ensure that the subwoofer function on the THX

listeners. When using more than one subwoofer,

from a decoder, connect the second subwoofer

controller is enabled. When so configured it

ensure that each one has its cut-off frequency

from the first. If using a decoder, use only one

incorporates all the filtering and level setting

and phase switch set the same way.

input channel. For two channel audio, both input

required for the subwoofer in all modes. For level

channels should be used.

If at any time you make changes to the

calibration, the internal test noise and channel

amplification of the system such that you change

level controls in the THX controller should be

Double check the connections

from speaker to line level connections to the

used. In all cases the levels should be set so as

subwoofer, it is worth checking the phase setting

Before auditioning the sound quality of your new

to obtain 75db spl (C-weighted) at the listening

again, as the speaker level and line level

installation and fine tuning it, double check the

position from the controller’s internal noise test

high-pass filter phase characteristics of the

connections. All too often, users complain that

signal. Refer to your controller manual for further

subwoofer are different.

they cannot get a decent sound however they set

details as to how to set the levels. Inexpensive

the controls, only to discover something has been

sound level meters are readily available from

Set the loudness of the subwoofer relative to the

wrongly connected. Make sure that:

electronics stores and should be used to

satellite systems to your liking. Use a wide

calibrate the levels.

variety of programme material to get an average

• The phasing is correct – there should be no

setting. One that sounds impressive on one piece

positive to negative connections (this applies

Use with other home theatre decoders

may sound overpowering on another. Listen at

only to speaker level interconnects). If

realistic levels as the perception of balance

something is out of phase you may get a fuzzy

•

If the decoder has a dedicated subwoofer

varies with sound level.

sound with an imprecise and floating image,

output and an internal low-pass filter for the

a lack of bass or a combination of the two.

subwoofer having a slope of 2nd-order

If you get problems with lumpy bass – if certain

(12db/octave) or greater, set the LOW-PASS

bass notes are exaggerated more than others –

• There are no left to right mix-ups – this can

filter frequency to maximum, otherwise set it

then you probably have a room interface

result, for example, in the orchestra being the

initially to 80Hz.

problem and it is worth experimenting with the

wrong way round or, more disastrously, sounds

placement of the subwoofer. What may seem

on your home theatre going in the opposite

• Set the volume control initially to the half-way

like small changes in position – 15cm (6in) or

direction to the action on the screen.

(12 o’clock) position, then see the section

so – can have a profound effect on the sound.

below on fine tuning.

Try raising the subwoofer clear of the floor as

Switching on and off

•

Set the phase switch initially to 0°, then see

well as lateral movement. The use of multiple

We recommend that you switch the subwoofer

the section below on fine tuning.

subwoofers can smooth the effects of room

on before any power amplifiers receiving signals

resonances as each subwoofer will tend to excite

Use for stereo audio

from the subwoofer. Similarly, when switching

resonances at different frequencies. If you alter

off, switch the subwoofer off last.

• Set the LOW-PASS filter initially to 80hz then

the relative distances from the subwoofer(s)

see the section below on fine tuning.

and satellite speakers to the listeners

On first switching the subwoofer on, the amplifier

appreciably, reassess the phase switch setting.

goes into standby mode and the light above the

• Set the VOLUME control initially to the half way

You should also check the level setting of the

on/auto/off switch glows red. When an input

(12 o’clock) position, then see the section

subwoofer (using either the decoder output

signal is detected, the amplifier automatically

below on fine tuning.

levels or the volume control on the subwoofer

becomes fully active and the light glows green.

• Set the PHASE switch initially to 0°, then see

amplifier as appropriate), but only after setting

After a period of about 5 minutes without an

the section below on fine tuning.

the phase correctly.

input signal, the amplifier automatically reverts

to standby mode.

Fine tuning

Taking care of the subwoofer

The optimum settings of the PHASE switch and

The cabinet of the subwoofer may be cleaned

Setting the controls

the LOW-PASS filter frequency are inter-related

by dusting with a dry cloth. If you wish to use

There are three controls to consider:

and also dependent on the low-frequency

an aerosol cleaning spray, do not spray directly

cut-off characteristic of the satellite speakers

on the cabinet; spray onto the cloth. Remove

• The LOW-PASS filter frequency

and the relative positions of all the speakers

the grille first so that the cloth does not become

• The VOLUME control

in the installation.

stained, but be careful not to disturb the drive

unit. The grille itself may be cleaned using

• The PHASE switch

Set the system up in the preferred position and

a soft brush.

play some programme with a steady bass content.

The optimum settings depend on the other

The optimum setting for the LOW-PASS cut-off

Do not use the subwoofer as a table. When

equipment used with the subwoofer. If using

frequency depends on several variables the bass

in use, objects left on top of the subwoofer are

more than one subwoofer, make sure the controls

performance and power handling of the satellite

liable to rattle. In particular, avoid the risk of

on each one are set the same.

speakers, the number of subwoofers used and

liquids being spilled (eg from drinks or vases

®

Use with THX

controllers (including THX

their position relative to the satellite speakers.

of flowers).

controllers set in non-THX mode)

The range 80-90Hz is a good starting point

If the system is taken out of use for a long period,

for the LOW-PASS frequency. Unless two

The ASW2000 is not an THX licensed

disconnect the subwoofer from the power supply.

subwoofers are used to preserve separate right

component, but may be used with a THX

and left channel information and are sited close

controller if desired.

to the relevant satellite speakers, using a higher

• Set the LOW-PASS filter frequency to

cut-off frequency may compromise the stereo

maximum.

image and should only be considered if the

bass performance of the satellite speakers is

particularly limited.

7