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OWNERSIMANUAINEO)

SOnSERIESM

DinE

GWAR

Egle

CMING

SP

EMWERIS

SIEM

MTUI

Sz.

VI

VIL

VIH.

901

SERIES

TILT

OWNER’S

MANUAL

TABLE

OF

CONTENTS

A.

Speaker

Placement

B.

Connecting

The

Speakers

1.

Selecting

The

Speaker

Wire

2.

Phasing

Your

901

Speakers

3.

Fusing

Your

901

Speakers

C.

Connecting

The

Equalizer

1.

Preferred

Method

(Using

The

Tape

Monitor

Circuit)

2.

Alternate

Method

|

(Using

PRE-AMP

OUT

and

MAIN

IN

Connections

with

Receiver

or

Integrated

Amplifier)

3.

Alternate

Method

I!

(Using

separate

PREAMPLIFIER

and

POWER

AMPLIFIER)

4.

Alternate

Method

II!

(Using

FOUR-CHANNEL

DECODER)

D.

Connecting

A

Tape

Recorder

E.

Connecting

Headphones

or

Conventional

Speakers

Getting

The

Most

Out

of

Your

901

Speakers

Adjusting

Speaker

Placement

Adjusting

The

Equalizer

Controls

Improving

Room

Acoustics

Selecting

The

Right

Amplifier

The

Qnty

non

Better

Than

A

Pair

of

901s

mopper

l.

INTRODUCTION

Thank

you

for

purchasing

the

BOSE

901

Series

II

Direct/Reflecting®

speaker

system.

The

listening

enjoyment

ex-

perienced

with

your

BOSE

901s

culminates

many

years

of

research

and

dedication

to

the

art

of

bringing

the

finest

musical

reproduction

into

your

home.

THE

BOSE

901

with

its

unique

shape,

9

drivers,

and

Active

Equalizer

incorporates

a

number

of

major

advances

in

speaker

technology.

It

is

designed,

installed,

and

connected

differently

from

conventional

loudspeakers.

These

major

differences

contribute

directly

to

the

new

level

of

realism

of

music

reproduction

provided

by

the

901

speaker

system.

The

detailed

installation

and

placement

instructions

are

important.

PLEASE

TAKE

THE

TIME

TO

READ

THIS

MANUAL,

as

this

is

the

only

way

you

will

obtain

the

full

benefits

of

the

901’s

unique

design.

You

will

be

amply

rewarded

by

the

listening

pleasure

which

your

901s

provide,

when

properly

installed.

Il.

UNPACKING

YOUR

901s

The

901

speaker

system

is

packed

in

two

cartons

marked

“Part

1”

and

“Part

2.”

THE

ACTIVE

EQUALIZER

IS

CONTAINED

IN

A

CARDBOARD

WEDGE

FOUND

IN

PART

1.

Unpack

both

cartons

carefully.

(Save

the

cartons

{v

and

packing

materials

for

possible

use

later.)

If

either

the

speakers

or

the

Equalizer

are

visibly

damaged

when

you

un-

pack

them,

do

not

place

the

system

in

operation.

Repack

the

speakers

and

the

Equalizer

in

the

original

cartons

and

notify

your

dealer

immediately.

(See

Section

V.)

Ill.

INSTALLATION

OF

YOUR

901s

A.

SPEAKER

PLACEMENT

One

of

the

most

important

advantages

of

the

BOSE

901

speaker

system

is

that

it is

designed

to

operate

properly

in

most

listening

rooms,

not

in

anechoic

test

chambers.

The

superior

dispersion

characteristics

of

the

901

allow

considerable

freedom

of

placement

and

an

unusually

large

“best

listening

area.”

To

obtain

the

full

performance

of

the

901,

you

must

follow

the

placement

guidelines

in

this

section.

The

angled

(vee

shaped)

grille

cloth

panels

are

the

back

of

the

901.

Point

the

vee

toward

the

wall.

The

distance

of

the

speakers

from

the

wall

is

very

important.

The

point

of

the

vee

should

be

12

inches

from

the

wall.

20

Cc

(Although

the

901

was

designed

to

be

placed

12

inches

from

a

reflecting

wall,

satisfactory

performance

can

be

;

obtained

anywhere

within

the

range

from

8

to

24

inches.)

The

point

of

the

speaker

should

be

aimed

directly

at

the

reflecting

wall,

and

NOT

directly

into

a

corner

(See

Fig.

1).

+18"-36'

46

-

FA

~_

DO

NOT

PLACE

HERE

(Half-way

point

between

ceiling

and

floor)

É

18”-36”

Ke

-4

FIG.

1

The

reflecting

wall

ideally

should

be

made

of

a

dense,

solid

substance

such

as

wood,

brick,

cement

block,

plaster,

or

sheetrock.

Substances

like

glass,

pegboard,

cork,

or

acoustic

tile

make

ineffective

reflecting

walls.

(The

Equalizer

is

designed

to

accommodate

surfaces

which

might

otherwise

present

problems.

[See

Section

IV

B.]

)

The

following

guidelines

should

be

followed

in

placing

the

speakers

relative

to

other

surfaces

in

the

room.

The

basic

idea

is

to

provide

space

around

the

speakers

to

allow

sound

waves

coming

from

the

rear

of

the

speaker

to

properly

disperse.

.

1.

2.

The

speakers

should

be

placed

18

to

36

inches

from

the

floor,

LC-

34

If

you

are

hanging

the

speakers

from

the

ceiling,

they

should

be

Positioned

18

to

36

inches

from

the

ceiling.

DO

NOT

place

your

speakers

exactly

half-way

between

the

floor

and

the

ceiling.

(See

Fig.

1.)

EG-

JA

The

speakers

should

be 18

to

36

inches

from

the

side

walls

or

from

openings

into

adjacent

rooms.

The

speakers

should

be

at

least

18

inches

from

nearby

massive

objects

such

as

bookcases,

cabinets,

or

other

large

pieces

of

furniture.

The

separation

between

the

speakers

should

be

between

4

and

15

feet.

(Best

results

will

be

obtained

with

a

separation

of

6

to

12

feet.)

A?

2-

In

general,

you

should

use

common

sense

and

be

sure

to

select

an

arrangement

which

does

not

appear

to

block

the

radiation

and

reflection

of

the

sound

into

the

room.

The

901s

can

be

placed

on

pedestals

or

tables,

on

top

of

cabinets,

or

on

shelves,

as

long

as

the

preceding

guidelines

are

followed.

If

the

speakers

are

in

a

room

with

a

color

television,

DO

NOT

place

the

speakers

closer

than

3

feet

to

the

television.

All

loudspeakers

are

equipped

with

powerful

magnets

which

may

disturb

the

delicate

adjust-

ments

of

your

color

TV.

CONNECTING

THE

SPEAKERS

1.

SELECTING

THE

SPEAKER

WIRE

If

the

wire

chosen

for

connecting

the

speakers

to

your

amplifier

has

too

much

resistance,

audible

colora-

tion

of

the

sound

and

loss

of

power

can

result.

The

table

below

summarizes

the

permissible

wire

lengths

for

18,

16,

and

14

gauge

two-conductor

copper

wire

for

one

or

two

pairs

of

BOSE

901

speaker

system(s).

Copper

zipcord

wire

is

readily

available

at

most

electrical

and

hardware

stores.

This

wire

usually

has

a

ribbed

line

running

along

one

of

the

two

conductors

so

that

the

conductor

can

be

identified

at

each

end

for

obtaining

the

proper

phasing

of

your

BOSE

901

speakers.

TABLE

1

—

WIRE

LENGTHS

FOR

EACH

SPEAKER

Type

of

Speaker

One

Pair

Two

Pairs

Hook-up

Wire

of

901s

of

901s

18

gauge

zipcord

33

feet

14

feet

(or

two-conductor

wire)

16

gauge

two-conductor

54

feet

23

feet

wire

14

gauge

two-conductor

86

feet

36

feet

wire

PHASING

YOUR

901

SPEAKER

It

is

important

that

the

connections

to

the

speakers

and

the

receiver

or

amplifier

be

the

same

for

both

channels

so

that

the

two

speakers

are

in

phase

with each

other.

The

two

terminals

on

the

bottom

of

the

901

are

marked

“8

OHMS”

and

“COM.”

RECEIVER

COM.

8OHMS

COM.

8-OHMS

FIG.

2

Start

with

the

Part

1

portion

of

your

901

system.

Place

it

on

the

left

side

of

your

room.

Connect

this

left

speaker

to

the

left

channel

speaker

output

terminals

of

your

amplifier

or

receiver.

(If

there

is

a

choice

of

impedances

on

the

amplifier

output,

use

the

terminal

marked

““8Q2”

or

“8

OHMS”)

*

Connect

the

“COM”

terminal

on

the

left

speaker

to

the

“COM”

terminal

on

the

left

channel

output

of

your

receiver

or

amplifier

output.

Connect

the

“8

OHMS”

terminal

on

the

left

speaker

to

the

“8

OHMS”

ter-

minal

on

the

left

channel

amplifier

output.

Connect

the

right

speaker

(Part

2)

in

the

same

manner

to

the

right

channel

amplifier

outputs

(See

Fig.

2).

Because

of

the

differing

terminology

which

various

manufacturers

use

on

their

receivers

and

amplifiers,

we

have

provided

the

chart

below

to

assist

you

in

identifying

the

proper

connection

points.

STANDARD

RECEIVER/AMPLIFIER

TERMINAL

MARKINGS

“COMMON”

Terminal

“COM”

“8

OHMS”

Terminal

"BQ"

also

known

as

so”

also

known

as

“Hot”

or

“Ground”

or

“Positive”

(+)

“Negative”

(—)

If

stranded

wire

is

used,

be

sure

that

the

loose

strands

do

not

touch

or

short-out

the

speaker

or

amplifier

terminals.

Also

make

certain

that

all

amplifier

and

speaker

terminals

are

tightened

securely.

*

If

two

pairs

of

901s

are

being

connected

in

parallel,

the

terminal

marked

“492”

or

“4

ohms”

on

the

receiver

or

amplifier

should

be

used.

(See

Section

IV

E.)

3.

FUSING

YOUR

901

SPEAKERS

Any

loudspeaker

is

subject

to

damage

if

the

amplifier

powering

it

should

fail.

The

use

of

a

fast-acting

fuse

in

series

with each

speaker

will

minimize

the

possibility

of

serious

damage

to

your

speakers.

BOSE

Corpo-

ration

recommends

the

use

of

a

3-ampere

fuse,

such

as

a

BUSS

AGC

3

or

a

LITTELFUSE

3

AG

(3

amp).

The

fuse

should

be

connected

in

series

with

either

of

the

two

wires

in

the

cable

to

each

speaker.

A

fuse

holder,

like

a

BUSS

3833-1

or

a

LITTELFUSE

356001

,

may

be

used

for

convenience.

(For

two

pairs

of

BOSE

901s,

use

two

6-ampere

fuses.)

CONNECTING

THE

EQUALIZER

THIS

PART

OF

THE

INSTALLATION

DIFFERS

FROM

THAT

OF

CONVENTIONAL

SPEAKER

SYSTEMS.

BE

CERTAIN

TO

FOLLOW

THE

INSTRUCTIONS

GIVEN

BELOW,

STEP

BY

STEP.

1.

PREFERRED

METHOD

(Using

The

Tape

Monitor

Circuit)

To

provide

the

proper

balance

at

all

frequencies,

the

901

Active

Equalizer

must

be

connected

in

your

sound

system

before

the

final

stage

of

amplification.

The

connection

method

described

in

this

section

can

be

used

with

virtually

all

integrated

amplifiers,

preamplifiers,

and

receivers.

For

the

sake

of

simplicity,

we

will

call

these

various

components

the

“control

amplifier.”

The

901

Equalizer

is

normally

connected

to

your

control

amplifier

as

if

it

were

a

tape

recorder.

It

utilizes

the

TAPE

MONITOR

function

and

connections

of

your

control

amplifier.

CAUTION

TO

PREVENT

ELECTRICAL

‘SH

Series

I

TO

QUALIFIED

PERSONNEL.

TAPE

RECORDER

CONNECTIONS:

|

Corps

COMMERTIONS

RECEIVER

FIG.

3

Referring

to

Figure

3,

connect

the

Equalizer

according

to

the

instructions

in

Steps

a

through

n:

a.

Turn

off

all

power

to

your

equipment.

b.

If

you

have

a

tape

recorder,

disconnect

it

from

the

rear

panel

of

your

control

amplifier.

Instructions

in

the

next

section

will

show

you

how

to

reconnect

your

tape

recorder

to

the

system

after

the

Equalizer

has

been

installed.

THE

FOLLOWING

STEPS

WILL

CONNECT

THE

EQUALIZER

TO

YOUR

PREAMPLIFIER,

~

RECEIVER,

OR

INTEGRATED

AMPLIFIER.

READ

THEM

CAREFULLY.

pA

Using

one

of

the

cables

supplied

with

the

Equalizer,

connect

the

RIGHT

channel

OUTPUT

terminal

of

the

Equalizer

to

the

RIGHT

or

“B”

channel

TAPE

MONITOR

terminal

of

your

control

amplifier.

(This

terminal

may

also

be

labeled

TAPE

PLAYBACK

or

TAPE

IN.)

If

your

control

amplifier

has

two

tape

monitor

circuits,

see

Page

9.

d.

Connect

the

LEFT

channel

OUTPUT

terminal

of

the

Equalizer

to

the

LEFT

or

“A”

channel

tape

monitor

terminal

of

your

control

amplifier.

e.

Connect

the

RIGHT

channel

INPUT

terminal

of

the

Equalizer

to

the

RIGHT

or

“B”

channel

TAPE

RECORD

terminal

of

your

control

amplifier.

(This

terminal

may

also

be

labeled

TAPE

OUT

or

REC

OUT.)

f;

Connect

the

LEFT

channel

INPUT

terminal

to

the

LEFT

or

“A”

channel

TAPE

RECORD

terminal

of

your

control

amplifier.

g.

Connect

the

AC

power

cord

of

the

Equalizer

to

a

switched

outlet

of

your

control

equipment

so

that

the

Equalizer

will

automatically

be

switched

on

or

off

by

the

power

switch

of

your

integrated

ampli-

fier,

receiver,

or

preamplifier.

If

the

preceding

steps

are

unclear,

it

may

be

due

to

the

different

nomenclature

which

various

manu-

facturers

employ.

Consult

your

integrated

amplifier,

receiver,

or

preamplifier

instructions

and

refer

to

the

section

describing

steps

for

connecting

a

tape

recorder

to

the

tape

monitor

circuit.

Remember

that

the

Equalizer

connects

like

a

recorder.

THE

NEXT

SEVEN

STEPS

ARE

TESTS

WHICH

MUST

BE

PERFORMED

TO

INSURE

PROPER

OPERATION

AND

CORRECT

INSTALLATION.

Place

the

TAPE

switch

on

the

Equalizer

in

the

MONITOR

position.

Place

the

3

frequency

contour

controls

so

that

they

coincide

with

the

indicated

dots.

These

are

the

“NORMAL”

positions

of

the

Equalizer

controls.

Place

the

TAPE

MONITOR

or

TAPE

FUNCTION

switch

on

your

control

amplifier

in

the

NORMAL

or

OUT

position.

Turn

the

entire

system

on.

Be

sure

that

the

Equalizer

is

plugged

into

an

operating

AC

outlet

by

observing

that

the

pilot

light

on

the

Equalizer

is

on.

Play

your

system

as

you

normally

would,

using

a

phonograph

or

AM-FM

source

(NOT

a

tape

recorder)

to

be

sure

it

is

operating

properly.

This

tests

the

rest

of

your

system,

since

the

Equalizer

has

not

yet

been

switched

into

the

system.

Any

errors

must

be

corrected

before

proceeding

further.

Turn

the

BALANCE

control

of

the

control

amplifier

to

the

extreme

right

and

left

to

check

for

correct

placement

of

the

right

and

left

channels.

With

the

system

playing,

move

the

TAPE

MONITOR

or

TAPE

FUNCTION

switch

on

your

integrated

amplifier,

receiver,

or

preamplifier

to

the

MONITOR

or

“ON”

position.

The

sound

should

stop.

This

TAPE

MONITOR

switch

on

your

integrated

amplifier,

preamplifier

or

receiver

should

be

left

in

this

position.

If

the

sound

does

not

stop,

recheck

Steps

a

through

I.

Place

the

Equalizer

TAPE

switch

in

the

NORMAL

position.

The

sound

should

return.

If

the

sound

does

not

return,

and

the

Equalizer

pilot

light

is

on,

then

the

Equalizer

is

probably

connected

in-

correctly.

Recheck

Steps

a

through

|.

NOTE:

If

the

TAPE

MONITOR

switch

of

your

control

amplifier

is

later

switched

out,

the

system

will

continue

to

play

but

the

Equalizer

will

no

longer

be

functioning

in

the

circuit.

Since

the

system

will

be

playing

and

the

Equalizer

pilot

light

will

be

on,

it

will

be

possible,

especially

at

low-volume

leyels

or

with

certain

musical

selections,

for

you

to

be

unaware

that

the

Equalizer

has

been

removed

from

the

circuit.

Check

the

TAPE

MONITOR

switch

on

your

control

equipment

periodically

to

make

certain

it is

still

in

the

ON

position.

If

you

do

not

have

a

tape

recorder,

the

installation

of

the

901

system

is

now

complete,

and

the

system

is

operating

properly.

If

you

do

have

a

tape

recorder,

its

connection

to

the

system

will

be

explained

in

Section

III

D.

ALTERNATE

METHOD

|

(Using

PRE-AMP

OUT

and

MAIN

IN

Connections

with

Receivers

or

Integrated

Amplifiers

[Refer

to

Fig.

4.]

)

TAPE

RECORDER

CONNECTIONS

PRE-AMP

MAIN-AMP

RECEIVER

FIG.

4

An

alternate

method

of

connecting

the

BOSE

Active

Equalizer

makes

use

of

the

PRE-AMP

OUT

and

MAIN

IN

jacks

provided

by

many

manufacturers

on

their

receivers

or

integrated

amplifiers.

To

do

this

refer

to

your

receiver

and

integrated

amplifier

owner’s

instruction

manual

for

separating

the

main

and

preamplifier

sections

of

their

units.

(This

is

usually

accomplished

by

removing

shorting

wires

or

plugs

and/or

moving

a

slide

switch).

Connect

the

PRE-AMP

OUT

terminals

to

the

Equalizer

INPUT

terminals,

and

connect

the

EQUALIZER

OUTPUT

terminals

to

the

MAIN

IN

terminals

of

the

receiver

or

integrated

amplifier.

With

this

method

of

connection,

leave

the

TAPE

switch

on

the

Equalizer

in

the

NORMAL

position.

Tape

re-

corders

are

connected

to

the

receiver

or

amplifier

in

the

conventional

manner.

The

disadvantage

of

this

method

of

connection

is

that

it is

difficult

to

use

conventional

speakers

or

headphones,

because

the

Equal-

izer

is

always

in

the

circuit.

ALTERNATE

METHOD

II

(Using

separate

PREAMPLIFIERS

and

POWER

AMPLIFIERS)

TAPE

RECORDER

CONNECTIONS]

AMPLIFIER

CONMECTIONS

OUTPUT

PRE

AMPLIFIER

MAIN-AMP

FIG.

5

The

Equalizer

can

be

connected

in

systems

that

include

separate

preamplifiers

and

power

amplifiers,

between

the

preamplifier

and

power

amplifier

(See

Fig.

5).

The

advantage

of

this

method

of

connection

is

that

the

tape

monitor

functions

of

the

preamplifier

are

still

available

for

connection

to

a

tape

recorder

in

the

conventional

manner.

One

disadvantage

of

this

method

of

connection

is

that

it

is

difficult

to

use

an

additional

pair

of

conventional

loudspeakers

or

headphones

because

the

Equalizer

is

permanently

in

the

circuit.

It

is

advisable

with

most

power

amplifiers

having

gain

controls

that

these

controls

be

turned

fully

clockwise

(consult

your

amplifier

manufacturer’s

owner's

manual

for

recommendations).

ed

before

the

final

stage

of

amplifica-

ally,

the

Equalizer

should

be

connected

prevent any

possible

overloading

of

the

ilable,

we

suggest

carefully

reading

the

garding

system

connection.

How

you

of

the

Equalizer

and/or

your

associated

Series

I

REFER

SERVICING

TO

E]

maa

FIG.

6

Since

the

Active

Equalizer

has

been

connected

to

what

are

normally

the

tape

recorder

terminals

of

your

integrated

amplifier,

preamplifier,

or

receiver,

extra

terminals

are

provided

on

the

Equalizer

for

the

connection

of

a

tape

recorder.

Follow

the

next

five

steps

carefully:

(Refer

to

Fig.

6.)

a.

Turn

all

power

off.

b.

Connect

the

RIGHT

channel

TAPE

IN

terminal

on

the

Equalizer

to

the

RIGHT

or

“B”

channel

w

OUTPUT

terminal

on

the

tape

recorder.

ë:

Similarly,

connect

the

LEFT

channel

TAPE

IN

terminal

on

the

Equalizer

to

the

LEFT

or

“A”

channel

OUTPUT

terminal

of

the

tape

recorder.

d.

Connect

the

RIGHT

channel

TAPE

OUT

terminal

on

the

Equalizer

to

the

RIGHT

or

“B”

channel

INPUT

(or

LINE

IN)

terminal

of

the

recorder.

e.

Similarly,

connect

the

LEFT

channel

TAPE

OUT

terminal

on

the

Equalizer

to

the

LEFT

or

“A”

channel

INPUT

(or

LINE

IN)

terminal

on

the

recorder.

Installation

of

the

tape

recorder

is

now

complete.

To

play

the

tape

recorder,

simply

place

the

TAPE

switch

on

the

901

Active

Equalizer

in

the

MONITOR

Position

(down).

A

å

M

CONTROL

AMPLIFIERS

HAVING

TWO

TAPE

MONITOR

CIRCUITS

Many

modern

preamplifiers,

integrated

amplifiers,

and

receivers

have

two

tape

monitor

functions

providing

the

same

monitoring

features

for

two

tape

recorders

instead

of

one.

However,

most

of

these

controls

are

constructed

to

prevent

both

monitoring

switches

from

being

turned

on

or

“activated”

at

the

same

time.

Since

the

BOSE

Active

Equalizer

must

be

in

the

circuit

while

the

901

speakers

are

being

used,

connecting

the

Equalizer

in

either

TAPE

1

or

TAPE

2

will

require

connecting

your

tape

recorder

to

the

BOSE

Equalizer

tape

monitor

circuit,

not

the

unused

TAPE

monitor

position

found

on

your

control

amplifier.

av

a

M

D.

4.

ALTERNATE

METHOD

IlI

(Using

FOUR-CHANNEL

DECODERS)

As

previously

stated,

the

BOSE

Active

Equalizer

should

be

connected

before

the

final

stage

of

amplifica-

tion

of

the

amplifier

channels

powering

the

901

speakers.

Additionally,

the

Equalizer

should

be

connected

at

a

point

in

the

signal

path

following

the

four-channel

decoder

to

prevent

any

possible

overloading

of

the

decoding

equipment.

Because

of

the

many

different

decoders

available,

we

suggest

carefully

reading

the

owner's

instruction

manuals

of

all

of

the

associated

equipment

regarding

system

connection.

How

you

connect

the

decoder

will

depend

upon

your

own

needs

for

control

of

the

Equalizer

and/or

your

associated

equipment.

CONNECTING

A

TAPE

RECORDER

ROR

RRR

CS

PO

W

x

a

ion

KX

REONORR

SIR

RRN

‘BOSE

CORPORATION

"AMPLIFIER

CONNECTIONS.

FIG.

6

Since

the

Active

Equalizer

has

been

connected

to

what

are

normally

the

tape

recorder

terminals

of

your

integrated

amplifier,

preamplifier,

or

receiver,

extra

terminals

are

provided

on

the

Equalizer

for

the

connection

of

a

tape

recorder.

Follow

the

next

five

steps

carefully:

(Refer

to

Fig.

6.)

a.

b.

Turn

all

power

off.

Connect

the

RIGHT

channel

TAPE

IN

terminal

on

the

Equalizer

to

the

RIGHT

or

“B”

channel

OUTPUT

terminal

on

the

tape

recorder.

Similarly,

connect

the

LEFT

channel

TAPE

IN

terminal

on

the

Equalizer

to

the

LEFT

or

“A”

channel

OUTPUT

terminal

of

the

tape

recorder.

Connect

the

RIGHT

channel

TAPE

OUT

terminal

on

the

Equalizer

to

the

RIGHT

or

“B”

channel

INPUT

(or

LINE

IN)

terminal

of

the

recorder.

Similarly,

connect

the

LEFT

channel

TAPE

OUT

terminal

on

the

Equalizer

to

the

LEFT

or

“A”

channel

INPUT

(or

LINE

IN)

terminal

on

the

recorder.

Installation

of

the

tape

recorder

is

now

complete.

To

play

the

tape

recorder,

simply

place

the

TAPE

switch

on

the

901

Active

Equalizer

in

the

MONITOR

position

(down).

CONTROL

AMPLIFIERS

HAVING

TWO

TAPE

MONITOR

CIRCUITS

Many

modern

preamplifiers,

integrated

amplifiers,

and

receivers

have

two

tape

monitor

functions

providing

the

same

monitoring

features

for

two

tape

recorders

instead

of

one.

However,

most

of

these

controls

are

constructed

to

prevent

both

monitoring

switches

from

being

turned

on

or

“activated”

at

the

same

time.

Since

the

BOSE

Active

Equalizer

must

be

in

the

circuit

while

the

901

speakers

are

being

used,

connecting

the

Equalizer

in

either

TAPE

1

or

TAPE

2

will

require

connecting

your

tape

recorder

to

the

BOSE

Equalizer

tape

monitor

circuit,

not

the

unused

TAPE

monitor

position

found

on

your

control

amplifier.

eF