Bowers & Wilkins 808 Bedienungsanleitung

Instruction

Manual

Introducing

Model

808

Model

808

B&W's

response

the

demand

for

system

capable

safely

delivering

sound

pressure

levels

120dB.

The

same

basic

sophistication

BO1F/S

—

now

regarded

the

professional

standard

monitoring

loudspeaker

worldwide

—

but

incorporating

whole

range

new

design

concepts

and

techniques.

808

five-driver,

three-way

system

with

sensitivity

double

that

801F/S,

and

overall

frequency

linearity

free

from

colouration

and

distortion,

providing

both

the

professional

recording

engineer

and

the

dedicated

home

user

with

the

particular

requirements

for

producing

realistic

sound

levels

large

environment.

WARNING

Because

Model

808

capable

such

high

sound

pressure

levels,

permanent

hearing

damage

can

result

from

daily

exposure

duration

longer

than

these

examples:

120dB

seconds.

110dB

minutes.

100dB

minutes.

9098

hours,

Unpacking

avoid

damaging

the

loudspeaker

when

removing

from

the

outer

case,

itis

important

these

instructions

carefully.

Stand

the

case

its

bearers.

Remove

the

strapping,

unscrew

the

lid

and

lift

off.

Remove

the

three

foam

packing

pieces

from

loudspeaker

sides

and

bottom,

but

leave

the

packing

the

top.

Gently

ease

the

loudspeaker

from

the

case

and

remove

plastic

cover.

Electrical

Connection

Connect

the

loudspeaker

your

amplifier

means

either

the

screw

terminals

4mm

plugs.

The

red

terminal

the

loudspeaker

should

connected

the

red

terminal

the

amplifier,

the

connection

marked

positive.

Correct

phasing

stereo

loud-

speakers

extremely

important

and

incorrect

connection

will

produce

loss

bass

and

poor

stereo

image.

This

will

rectified

reversing

the

connections

one

the

loudspeakers.

itis

good

practice

keep

the

connecting

leads

between

the

power

amplifier

and

speakers

short

possible,

and

use

heavy

gauge

wire

keep

the

resistance

minimum.

will

appreciated

that

the

input

the

laudspeaker

complex

impedance,

and

when

your

system

operating

high

levels

very

high

currents

will

carried

the

inter-

connecting

cables.

Considerable

work

has

been

carried

out

recent

years

the

effect

different

cables,

and

there

fairly

conclusive

evidence

show

that,

although

subtle,

these

differences

are

apparent.

would

recom-

mend,

therefore,

that

cable

lengths

exceed

metres

care

should

taken

over

their

choice,

and

any

event

good

engineering

practice

employ

really

heavy

gauge

cables

the

highest

quality.

Bi-

and

tri-amplification

order

facilitate

bi-

tri-

amplification,

the

inputs

each

individual

filter

section

(low-

frequency,

midrange,

high-

frequency)

have

been

brought

out

three

separate

terminals.

electronic

crossover

required.

With

normal

operation

using

single

amplifier,

shorting

links

are

provided

which

parallel

the

input

terminals,

and

the

ampli-

fier

may

therefore

connected

any

these

terminals.

Obviously

with

tri-amplification

separate

amplihers

will

used

for

each

section,

but

the

usual

and

recommended

sys-

tem

would

bi-amplification

where

the

larger

the

two

amplifiers

used

for

the

bass

section,

and

the

smaller

ampli-

fier

for

the

midrange

and

treble

sections

which

are

then

con-

nected

parallel

with

one

pair

the

shorting

links

provided.

The

Listening

Room

and

Positioning

Your

Loudspeakers

Environmental

Controls

professional

applications

the

acoustics

will

well

controlled.

Domestic

listening

rooms

however

vary

widely

both

their

acoustics

and

the

positioning

preferred

operate

the

loudspeakers.

For

this

reason,

control

has

been

provided

for

both

the

midrange

and

high-frequency

sections

with

precision-switched

attenuators.

The

resulting

characteristics

are

shown

the

plots

below

(fig.

1).

terms

professional

application,

Model

808

provides

linear

extension

free-field

response

30Hz,

this

characteristic

ideal

for

controlled

environment

with

particular

reference

digitally

recorded

material.

less

well

controlled

domestic

environ-

ments,

however,

some

attenuation

the

bass

extension

may

desirable,

and

electronic

bass

contour

control

unit

the

process

development,

The

driver

configuration

Model

808

has

been

deliber-

ately

conceived

mirror-

image

pair,

with

the

midrange/

high-frequency

assernblies

offset

from

the

vertical

centre

line

the

cabinet.

This

con-

figuration

gives

asymmetrical

polar

characteristic

relative

the

centre

axis

the

loud-

speaker

and

can

help

improving

stereo

imagery.

perfectly

acceptable

position

the

loudspeakers

that

these

assemblies

are

closely

widely

spaced.

general

rule,

the

loud-

speaker

placing

relatively

wide

then

the

pairing

should

such

that

the

assemblies

are

adjacent

(fig.

2).

Conversely,

closely

spaced,

they

can

further

apart

(fig.

3).

Both

the

listening

room

and

positioning

your

loudspeakers

within

the

room

will

widely

influence

the

tonal

balance

and

stereo

information

you

receive.

Choice

listening

room

often

restricted

but

you

are

able

choose,

the

following

points

may

helpful.

All

enclosed

volumes

exhibit

resonances

which,

the

case

the

listening

room,

will

essentially

determined

the

distance

between

parallel

surfaces.

The

strongest

res-

onances

will

lie

between

30Hz

and

180Hz

average

domestic

room

sizes.

The

most

unsuitable

listening

room

would

one

where

all

dimensions

(wall

spacing

and

ceiling

height)

are

similar,

since

all

resonances

occur

over

narrow

band

frequencies

Rooms

where

all

dimensions

are

different

give

the

most

even

and

natural

bass

response.

Protuberances

and

larger

items

furniture

tend

break

these

resonances

and,

where

practical,

varying

the

position

such

items

can

often

favourably

influence

sound

reproduction.

Soft

furnishings,

wall

coverings

and

even

pictures

influence

middle

and

high

frequencies.

ideally

you

should

aim

avoid

discrete

resonances

ring-

ing’,

and

easy

test

for

this

problem

simple

hand-clap.

resonances

exist

there

will

distinct

'overhang'

sustain-

ing

the

response

which

could

last

between

0.5

and

second.

bookcase,

placed

wall

opposite

reflective

surface

such

window,

will

often

help

alleviate

the

problem

outlined

above.

Alternatively,

panel

acoustic

tiles

placed

wall

can

produce

remarkable

improvement.

all

B&W

designs

the

config-

uration

the

drive

units

and

the

characteristic

the

crossover

network

are

designed

that

the

horizontal

dispersion

the

sound

broader

than

the

vertical

dispersion,

thus

ensuring

wider

freedom

seating

with

accurate

stereo

information.

Figs.

The

actual

position

your

loudspeakers

within

the

listen-

ing

room

can

widely

influence

sound

reproduction.

Two

typical

positions

are

shown

figs.

647.

The

environmental

measure-

ments,

fig.

show

the

wide

variation

which

can

achieved

loudspeaker

positioning.

cannot

emphasise

too

strongly

that

time

spent

experimenting

with

the

position

your

loudspeakers

invariably

worthwhile.

tpt

ites

Sao

Фьла

ёғ

eee

иШ

Switch

position:

Midrange

0’.

High

frequency

+1",

0%,

'—

Switch

position:

High-

frequency

'0".

Midrange

'—1'.

PAS

RES

—

„=

imo

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Быр

Overload

Protection

B&W

were

the

first

major

loud-

speaker

manufacturer

the

word

introduce

full

electronic

protection

against

damage

and

overload

their

loudspeakers.

APOC

(audio

powered

over-

load

circuit).

Model

808,

this

protection

fitted

individually

the

midrange

and

high-frequency

drivers.

Should

thermal

transient

overload

condition

occur,

drive

will

automatically

removed

from

the

appropriate

unit

and

the

LED

will

show

until

the

fault

condition

removed.

The

loudspeaker

will

then

automatically

retum

normal

operation.

The

voice

coils

808

have

been

designed

withstand

temperatures

excess

250°С.

Mechanical

clearances

also

ensure

that

peak

excursions

cannot

damage

the

bass

driver

voice

coils.

Therefore,

reduce

insertion

loss

APOC

omitted

from

the

bass

section.

However,

some

caution

should

observed

with

amplifiers

over

600

watts

per

channel.

Ancillary

Equipment

discriminating

listener,

you

will

not

have

chosen

your

808

loudspeakers

without

thorough

preliminary

listening

tests.

You

will

have

discovered

that

far

from

being

the

weakest

link

the

chain

—

loud-

speakers

are

often

described

—

the

performance

the

808

warrants

the

best

ancillary

equipment

available

order

realise

its

full

potential.

While

cannot

course

recommend

specific

equipment

manufacturers,

there

wide

range

top-quality

components

available.

Since

you

have

already

invested

one

the

world's

finest

speakers,

you

should

therefore

pay

equal

attention

your

choice

pickup

arm,

cartridge,

amplifier,

tuner,

tape

recorder

player.

Differences

between

them

may

subtle

but

they

exist,

and

your

own

listening

experience

invaluable

quide.

Because

its

high

power

handling

capability

and

protection

circuits,

damage

can

result

your

808

system

using

adequately

high-powered

amplifier.

This

preferred

allows

sufficient

headroom

for

the

high

level

transient

information

available,

and

our

minimum

amplifier

power

recommendation

200

rms

per

channel

into

ohms.

Reliable

advice

always

avail-

able

irom

reputable

hi-fi

specialist,

and

our

own

specially-appointed

B&W

dealer

will

pleased

give

you

expert

assistance.

Natu-

rally,

itis

possible

carry

out

listening

test

your

home,

using

familiar

recordings,

this

the

best

way

ensure

lasting

satisfaction.

Free-field

Frequency

Response

E E

WON

BOE

8 À

OH OE

W W

BON

NON EON

EON

HON

NON

WOW

ыы

ев

ЦЕ

ка

hang,

^um

Taken

Europe's

largest

anechoic

chamber

Garston,

Fault

Finding

Service

Model

808

has

been

specifi-

Throughout

the

world

BAW

cally

designed

withstand

Loudspeakers

have

appointed

high

power

levels.

With

the

distributors

who

are

respon-

combination

APOC,

ferro-

sible

for

service.

Should

you

fluid

tweeter,

high

temperature

experience

any

difficulty,

Kapton

coils

and

polyester

please

contact

the

dealer

from

capacitors

perhaps

the

whom

you

purchased

the

loud-

world's

most

reliable

loud-

speakers.

speaker

and

should

give

years

trouble-free

service.

Polar

Response

—

loudspeaker

р—_а

8) dd

cea

eet

4 4

4—1

1—1

eier

4-4

414

—34

4-4

Fit?

е.

uae

TIN

ala

AAA

net

Urna

Kant

Honzontal

response,

asymme#ncal

1kHz

characteristic

enhance

stereo

imagery.

Specification

Frequency

Response

30Hz

20kHz

2d8

Low

Frequency

Bass

rellex

employing

Two

300mm

drive

units

Helmholtz

box

resonance

22H».

Midrange

System

Acoustic

line

taading

employing

two

100mm

units

Bass

Drivers:

BT300

Ckaphragm

270mm

thermoplastic

cone

wih

PVA

compound

coating

Ultra

long

throw

suspension

voice

cod

Sor

dia.

high

temperature

Kapton

magnet

system

4.5kg

ceramic.

Thus

unl

i-a

high

power

handling

development

the

bass

unit

used

801

Midrange

Drivers:

MT100

Diaphragm

100mm

aromatic

polyamide

Fibre

matre

cone,

cntically

lormed

and

PVA

impregnated

following

laser

interleromeiny

computer-iinked

pattem

Voice

cod

26mm

high

temperature

Kapton

This

unit

high

power

handling

version

the

midrange

unit

used

ВОЯ

Harmonic

Distortion

pear

Marga

mida

bmc

жапар

len

фа

зане

ГЕ

ЕТ

Ма.

aperi

aeu

Ыы

High

Frequency

Driver:

TX32

Diaphragm

32mm

polyamide

formed

critical

contour

determined

computer-linked

laser

inlerlerometny

Coil,

aluminium

former

with

high

power

Ipead-out

terninahons

and

immersed

ferra

fluid

state-otHne-artr

performance

Magnet

system,

lernte

employing

reversed

held

technology

for

increased

flux

Vertical

+0,

=1.5

over

10*

arc,

Hornzantak

+0,

-2dB

over

AC"

arc

ZO0Hz

—

15847

Distortion:

20Hz

100Hz

20kHz

2nd

Harmon

1.00%

140%

10008

а!

Harmonic

1.00%

0.79%

¿nd

Harmonie

0.50%

0,64%

9600

3rd

Harmonic

0.70%

050%

"Maxımum

figuras

each

teve!

Impedance

Bohms

nominal,

not

ess

than

4ohme

amy

(гедиегиу

Sensitivity

;

Wall

into

&ohms

load

lora

sp.

tdg.

Tm.

Sinewave

input

1kHz

Power

Handling

upper

limit

midrange

and

tweeter

due

automalic

protection

cifctats

Bass

continuous

sinewave

polw

400Hz

Crossover

ath-order

Bulterworth

squared

cantiguratian

with

crossover

hequéncos

400Hz

and

ЗЕН.

with

line

delay

correción

between

midrange

and

tweeter

means

огап

all-pass

network

and

tri

ampinc

made

easy

separate

terminals

for

each

unit

electrolytic

capacilors

are

used

Dimensions

Height:

1050mm

(АЛ

Van];

113mm

(43un)

with

ninth

22mm

(44

Vain)

with

wheels

and

pnt

Width:

samm

(25%.

Depth

510mm

(20m)

without

gre;

542mm

[21

in)

with

grille.

Weight!

7Bkg

(1801b)

MSN

Peme

fies

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