Bose 901 Series IV Owner's guide - Page 6

Installation

B.

CONNECTING

THE

SPEAKERS

1.

Wire

Selection

If

the

wire

used

to

connect

the

speakers

to

your

power

ampli-

fier

has

too

much

resistance,

audible

coloration

of

the

sound

and

loss

of

power

can

result.

The

table

below

sum-

marizes

maximum

wire

lengths

for

18-, 16-,

and

14

-gauge.

two

-conductor,

stranded

copper

wire

for

use

with

one

or

two

pairs

of

BOSE

901

loudspeakers.

TABLE

1

RECOMMENDED

CONNECTION

WIREt

.Wire

Length

One

Pair

of

901s

Wire

Length

Two

Pairs

of

901s

Type

of

Speaker

Hook

-Up

Wire

27

feet

13

feet

18

-gauge

zipcord

(or

two

-conductor

wire)

42

feet

21

feet

16

-gauge

two

-conductor

wire

67

feet

34

feet

14

-gauge

two

-conductor

wire

In

most

instances,

copper

zip

-cord,

readily

available

at

most

electrical

and

hardware

stores,

can

be

used

to

speaker

connection.

This

wire

usually

has

a

ribbed

line(s

along

one

side

of

the

insulation

so

that

each

wire

can

be

identified

for

proper

phasing

of

your

speaker

system.

tThe

wire

lengths

shown

in

Table

I

were

calculated

on

the

basis

of

a

maximum

audible

cdorahon

of

4:0.5

dB.

Following

the

guidelines

provided,

the

most

discerning

listener

will

be

unable

to

detect

any

coloration

introduced

by

the

speaker

wire.

Most

listeners

will

not

notice

any

effect

even

if

wire

lengths

are

increased

by

as

much

as

50%.

6

2.

Phasing/Wiring

It

is

important

that

the

amplifier

connections

for

both

901

speaker

systems

be

identical

(see

Figure

3)

so

that

both

speakers

work

together

(in

phase).

a.

Start

with

the

speaker

marked

"Part

1."

b.

Place

it

on

the

left

side

of

your

room

facing

the

speaker

system.

c.

Locate

the

"

+

"

and

"

—

"

terminals

on

the

bottom

of

the

speaker.

d.

Using

the

speaker

wire

(which

is

marked

to

distinguish

one

conductor

from

the

other),

connect

the

"Part

1"

speaker

terminal

marked

"

—

"

to

the

terminal

marked

"com,"

"negative,"

or

"minus"

on

the

left

channel

amplifier

output.

(When

connecting

the

901

Series

IV

loudspeakers

to

your

amplifier,

if

there

is

a

choice

of

impedances

on

the

amplifier

output,

use

the

terminal

marked

"8"

or

"8

ohms."

If

two

pairs

of

901

Series

IV

loudspeakers

are

being

connected,

the

terminal

marked

"4"

or

"4

ohms"

on

the

receiver

or

amplifier

should

be

used.)11

-

e.

Connect

the

"

+

"

terminal

on

the

left

speaker

to

the

terminal

marked

"pos,"

"positive,"

or

"plus"

on

the

left

channel

output

of

the

amplifier

or

receiver.

NOTE:

Use

only

the

terminals

marked

"

+

"

and

"—."

The

terminal

marked

"*"

is

intended

for

future

electro-

nic

Flevelopments

and

should

not

be

used

with

conven-

tional

amplifying

equipment.

itNote:

When

operating

your

901s

in

stereo,

only

one

equalizer

is

required.

If

addi-

tional

pairs

of

901s

are

used.

they

can

be

purchased

without

the

equalizer.

These

speakers

are

sold

as

"add-on"

pairs

and

can

be

connected

as

extensOn

speakers

or

used

in

addition

to

the

first

pair

of

speakers.

When

connecting

two

pairs

01901

speakers

to

your

equipment.

wire

the

speakers

in

parallel:

most

re

ce

ntly

manufactured

receivers

or

amplifiers

will

operate

two

pairs

of

901s

wired

in

this

manner.

However,

if

your

receiver

or

amplifier

is

not

capable

of

4

-ohm

Operation

with

two

pairs

of

901s.

wire

the

speakers

in

series.

Contact

your

dealer

if

any

further

assistance

is

required.

Bose 901 Series IV Owner's guide - Page 6

Phasing/Wiring

Page 6 highlights