Bose 901 Series IV Owner's guide - Page 11

To

use

this

method

of

connection,

refer

to

your

receiver

and

integrated

amplifier

owner's

instruction

manual

for

separating

the

main

and

preamplifier

sections

of

the

unit.

(This

is

usually

accomplished

by

removing

shorting

wires

or

plugs

and/or

moving

a

slide

switch.)

Connect

the

PREAMP-

OUT

terminals

to

the

equalizer

INPUT

terminals,

and

con-

nect

the

EQUALIZER

OUTPUT

terminals

to

the

MAIN

-IN

terminals

of

the

receiver

or

integrated

amplifier

(see

Figure

6).

With

this

method

of

connection,

do

not

use

the

tape

recorder

connection

jacks

on

the

equalizer

and

leave

the

TAPE

switch

(on

the

equalizer)

in

the

NORMAL

position.

Tape

recorders

are

now

connected

to

the

receiver

or

amplifier

in

the

conventional

manner.

EQUALIZER

AMPLIFIER

TAPE

RECORDER

CONNECTIONS

7

CONNECTIONS

R

L

R

R

I.

R

7I

1

0

0

0

0

I

•-

OMNI

-

NUT

R

L

a

MAIN

-AMP

PRE

-AMP

IN

OUT

CONTROL

AMPLIFIER

Figure

6

4.

Using

Four

-Channel

Equipment

Most

quadraphonic

receivers

have

four

-channel

tape

moni-

tor

or

preamp

out/main

in

connection

jacks.

These

connec-

tion

jacks

can

be

used

for

the

BOSE

equalizer.

If

two

pairs

of

901s

are

used,

two

active

equalizers

are

re-

quired.

Connect

one

equalizer

for

the

front

channels

and

one

for

the

rear

channels.

If

conventional

speakers

are

used

with

the

901s,

connect

the

equalizer

in

the

channel

powering

the

901

speakers.

For

the

channels

operating

the

conventional

speakers,

use

standard

connection

cables

and

connect

the

input

to

the

output

jacks

directly.

Phase

reversal

occurs

when

the

901

equalizer

is

con-

nected

in

the

circuit.

For

this

reason,

your

control

amplifier's

speaker

phasing

procedure

should

be

repeated

when

using

conventional

speakers

with

the

BOSE

901's.

This

important

procedure

involves

listening

to

musical

passages

with

deep

bass

to

determine

the

proper

phase

of

your

speakers.

In

most

cases,

this

will

require

the

reversal

of

one

pair

of

speaker

connections.

For

separate

components,

connect

the

equalizer

after

the

output

of

the

decoder.

We

suggest

reading

the

related

sec-

tions

of

this

manual

before

proceeding.

Also,

be

certain

to

recheck

your

speaker

phasing.

Note:

Due

to

the

spatial

and

spectral

properties

of

the

901

Series

IV

system,

optimum

performance

is

obtained

when

all

four

speaker

systems

are

identical.

However,

if

four

901's

are

not

used,

we

suggest

using

speakers

having

similar

spatial

characteristics,

such

as

the

Bose

Direct/Reflectinge

601

or

Model

501

speaker

systems.

These

speaker

systems

have

been

designed

by

Bose

'to

match

the

901

system

when

used

in

quadraphonic

operation.

11

Bose 901 Series IV Owner's guide - Page 11

Direct/Reflectinge

Page 11 highlights