Bose 501 Series III Loud Owner's guide - Page 3

3.

Locate

the

left

speaker

input

terminals

located

on

the

back

of

the

cabinet.

Note

that

there

are

two

terminals

marked

+

(POS)

and

—

(COM).

4.

Connect

one

wire

conductor

to

the

terminal

marked

—

(COM)

on

the

left

speaker.

Connect

the

other

end

of

the

same

conductor

to

the

output

terminal

marked

COM,

GND.

NEG

or

—

on

the

left

channel

of

your

amplifier.

Use

the

color

-coding

or

ribbed

fi

ne(s)

on

the

wire

to

be

sure

you

are

using

the

same

conductor.

5.

In

the

same

manner,

connect

the

4-

(POS)

terminal

on

the

left

speaker

to

the

output

terminal

marked

POS

or

+

on

the

left

amplifier

channel.

(If

your

amplifier

offers

a

choice

of

output

impedances,

use

the

terminal

marked

8

or

8

OHMS).

6.

Repeat

steps

4

and

5

above.

connecting

the

right

speaker

to

the

right

output

channel

of

your

amplifier

or

receiver.

Tighten

all

terminal

connections

firmly.

7.

Check

very

carefully

to

be

certain

that

no

loose

strands

of

wire

are

accidentally

"bridged"

across

the

terminals

on

either

the

speakers

or

the

amplifier.

Bridged

wires

cre-

ate

short

circuits

which

can

damage

your

amplifier.

Repair

any

loose

wire

strands

before

plugging

in

your

amplifier

or

receiver.

6.

Phasing

Test

It

you

ar

e

not

certain

that

the

speakers

are

connected

to

your

amplifier

"in

phase"

(i.e.,

positive

to

positive,

negative

to

negative),

perform

this

simple

test:

1.

Set

your

sound

system

for

MONO

(i

irunophonic)

repro-

duction.

Be

sure

the

balance

control

is

centered

or

set

to

normal.

2.

Temporarily

place

the

loudspeakers

so

that

they

are

fac-

ing

each

other

closely.

3.

Play

music

containing

deep

bass

notes

through

the

system.

If

the

speakers

are

phased

correctly,

the

sound

will

appear

to

come

from

a

point

between

the

speakers

with

full,

natural

bass

response.

SILHLO

AMPLII

ILH

OH

FALCLIVLIA

tun

Oulix4

+

-

Hight

CkApul

2A

2

A'

tOptional

2

ampere

fast

-blow

fuse

Part

1

(See

secticn

Pert

2

Leh

Speaker

Right

Speaker

TAV3.

Figure

2.

Speaker

connection.

4.

If

the

music

seems

to

be

lacking

in

deep

bass,

reverse

the

wire

connections

to

one

speaker

and

repeat

the

test.

Use

the

connection

that

produces

the

most

power-

ful

bass.

7.

Fusing

My

loudspeaker

can

be

damaged

if

the

amplifier

driving

should

fail.

Damage

may

also

occur

by

playing

the

music

so

loudly

that

it

sounds

distorted.

Thls

can

happen

even

with

a

low

-powered

amplifier

or

receiver.

Your

Bose

501

-

speakers

incorporate

automatic

protection

circuitry

which

guards

against

certain

types

of

electrical

stress.

Fusing

will

provide

additional

protection,

and

is

rec-

ommended

in

most

applications.

The

fuseholders

should

be

inserted

into

the

F

(POS)

wire

connecting

each

speaker

to

your

amplifier

or

receiver

(see

Figure

2).

Use

2

-ampere,

fast

-blow

Buss

AGC

Series

or

equivalent

fuses.

A

fuse

kit

containing

fuses

and

holders

is

available

from

the

Bose

Customer

Service

Department,

The

Mountain,

Frarningham,

Massachusetts

USA

01701

for

$5.00.

Ask

for

501

Fuse

Kit,

Part

Number

108938-1.

mart

Lee

Speaker

I

2

3

t;)

4

%tato

CIOCittfitse

11110611M1

'elected

faXAIK$

Nor

3

eg)

Rcealecoo+44+4:k4r4;

or

maxim

-an

ceflocio

curs

Figure

3.

Operation

of

the

Direct

Energy

Control.

8.

Direct

Energy

Control

The

501

Direct

Energy

Control

lets

you

change

the

spatial

distribution

pattern

of

your

speakers

to

fit

virtually

any

type

of

placement

or

music.

Its

audible

effect

depends

on

your

distance

from

the

speakers

and

the

acoustics

of

your

listen-

ing

room.

In

most

cases.

proper

adjustment

of

the

Direct

Energy

Controls

will

significantly

improve

the

spatial

perfor-

mance

of

your

501

system.

Note

that

the

numbers

shown

in

Figure

3

are

for

reference

purposes

only

and

do

not

actually

appear

on

the

speakers.

Control

positions

1

and

2

provide

maximum

direct

sound

energy

at

high

frequencies.

These

positions

should

be

used:

a.

if

there

is

no

sound

-reflecting

surface

within

3

feet

(90

cm)

of

the

outward

-firing

tweeter

system:

b.

when

a

relatively

narrow

stereo

image

is

desirable;

e.g..

solo

musicians

and

small

performing

ensembles.

Control

position

3

provides

a

normal

balance

of

reflected

and

direct

sound

energy.

Use

this

position:

a.

when

there

is

a

sound

-reflecting

surface

within

1

1

/

2

-3

feet

(45-90

cm)

of

the

outward

-firing

tweeter

system;

Bose 501 Series III Loud Owner's guide - Page 3

Phasing, Fusing, Direct, Energy, Control

Page 3 highlights