Bose 901 Series IV Owner's guide - Page 18

Technical

Information

B.

110.220

VAC

VOLTAGE

CONVERSION

The

BOSE

Series

IV

Equalizer

is

designed

to

operate

on

one

power

line

voltage

only.

Equalizers

manufactured

for

120

VAC

operation

are

not

con-

vertable

to

240

volt

operation

except

by

factory

modification.

Equalizers

manufactured

for

240

VAC

operation

may

be

con-

verted

to

120

VAC

operation

by

BOSE

Authorized

Factory

Ser-

vice

Agencies.

(The

speakers

require

no

voltage

conversion.)

C.

IN

CASE

OF

DIFFICULTY

If

you

suspect

that

there

is

a

problem

with

your

901

system,

it

is

worth

a

few

minutes

of

your

time

to

determine

whether

your

901s

are

defective,

and

if

so.

what

part

of

the

system

is

defec-

tive.

If

one

speaker

sounds

defective,

DO

NOT

switch

the

speaker

cables,

as

this

may

damage

the

speaker

operating

correctly.

Instead,

disconnect

the

wire

of

the

speaker

sus-

pected

of

being

defective

at

the

amplifier

output

and

reconnect

to

the

amplifier

channel

operating

correctly.

(This

can

generally

be

done

without

disconnecting

the

correctly

functioning

speaker.)

If

the

speaker

system

that

sounded

defective

now

plays

correctly,

the

difficulty

is

not

in

the

speakers

or

in

the

speaker

wiring.

If

bass

and

high

frequencies

seem

weak,

check

to

assure

that

the

equalizer

is

in

the

circuit.

If

you

hear

distortion

when

both

speakers

are

operating

at

high

sound

levels

that

disappears

when

you

turn

the

volume

down

or

push

the

Low

Filter

switch

"In,"

you

are

probably

overloading

the

amplifier.

If

the

trouble

seems

to

be

in

the

equalizer,

be

sure

that

the

system

operates

properly

with

the

equalizer

out

of

the

circuit.

This

can

be

determined

by

disconnecting

the

equalizer

from

the

circuit.

Be

certain

that

all

cables

are

connected

properly

and

that

the

cables

are

not

defective.

18

If

the

trouble

still

persists,

contact

your

dealer.

He

will

arrange

for

service

or

have

the

unit

checked

for

proper

operation.

The

complete

procedure

for

obtaining

service

is

outlined

in

the

warranty

found

in

SECTION

VII

of

this

manual.

D.

CARE

AND

MAINTENANCE

Your

901

speaker

cabinets

and

equalizer

are

made

with

an

oil

-

rubbed

walnut

veneer

finish.

Any

good

grade

of

furniture

polish

used

for

wood

finishes

can

be

used

in

normal

dusting

and

cleaning:

however,

to

maintain

the

beautiful

appearance

of

your

901s,

we

suggest

occasionally

rubbing

the

cabinet

with

linseed

oil.

After

rubbing,

use

a

dry

cloth

and

polish

off

any

excess

oil.

Grille

cloths

generally

require

no

care,

although

they

may

be

carefully

vacuumed

if

necessary.

Bose 901 Series IV Owner's guide - Page 18

Authorized

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