Bose Model 301 Owner's guide - Page 9

•

•

C.

Adjustment

of

the

Direct

Energy

Control

The

Direct

Energy

Control

has

been

carefully

designed

to

provide

the

optimum

performance

of

the

Model

301

under

a

wide

range

of

listening

conditions.

This

control

primarily

affects

the

spatial

distri-

bution

of

high

frequencies

above

5

kHz.

At

distances

close

to

the

loudspeaker,

the

effect

of

the

control

on

high

frequency

energy

is

very

large,

reaching

15

dB

at

15

kHz.

However,

the

effect

decreases,

becoming

more

subtle,

with

increasing

distance

from

the

speaker

and

will

be

less

noticeable

in

larger

rooms,

where

the

listener

is

prin-

cipally

in

the

reverberant

field.

Under

most

listening

conditions,

critical

listeners

will

find

that

the

Direct

Energy

Control

provides

a

significant

aid

in

optimizing

the

performance

of

the

Model

301.

Please

note

that

the

numbers

which

appear

in

Diagram

6

are

for

reference

only

and

do

not

appear

on

your

speaker

system.

They

are

there

to

help

you

understand

the

positioning

required

for

optimum

performance

in

your

listening

environment.

In

the

diagram,

the

left

speaker,

when

starting

from

the

top

marking,

is

rotated

clockwise

for

increasingly

high

numbers.

The

right

speaker

is

rotated

counter-

clockwise

for

the

same

increase

in

reference

numbers.

The

following

guidelines

should

be

followed:

POSITIONS

1

AND

2

These

positions

provide

the

maximum

direct

sound

energy

at

high

frequencies.

For

horizontal

placement

they

are

used

to

establish

high

frequency

balance

if

side

reflecting

walls

are

not

present

or

are

covered

with

sound

absorbing

material.

These

positions

provide

less

stereo

spread

than

higher

numbers

and

will

be

preferred

by

some

listeners

for

reproduction

of

soloists

and

small

ensembles.

Use

positions

1

and

2

for

vertical

placement

if

the

speaker

is

placed

higher

than

4

feet.

POSITION

3

This

is

the

normal

setting

of

the

Direct

Energy

Con-

trol.

This

position

is

used

for

horizontal

placement

when

a

side

re-

flecting

wall

is

located

near

the

side

of

the

speaker,

as

shown

in

Diagram

2,

page

6.

Under

this

condition,

most

of

the

high

frequency

tri

PART

1

ROTATE

CLOCKWISE

FOR

MAXIMUM

REFLECTED

SOUND

eL

PART

2

1

ROTATE

COUNTER

CLOCKWISE

FOR

MAXIMUM

REFLECTED

SOUND

DIAGRAM

6

POSITIONS

OF

THE

DIRECT

ENERGY

CONTROL

energy

from

the

tweeter

will

be

reflected

by

the

side

wall

into

the

center

of

the

room.

Use

position

3

for

vertical

placement

if

the

speaker

is

placed

lower

than

4

feet,

or

within

2

feet

of

a

hard

ceiling.

POSITIONS

4

AND

5

These

positions

provide

minimum

direct

sound

energy

at

high

frequencies

and

are

used

for

horizontal

place-

ment

if

a

reflecting

side

wall

is

present.

Operation

in

Positions

4

and

5

will

provide

very

spacious

stereo

reproduction,

especially

suited

for

large

ensembles

such

as

an

orchestra

or

a

chorus.

D.

Room

Acoustics

The

sound

quality

of

loudspeakers

depends

on

many

environmen-

tal

factors

other

than

speaker

placement,

such

as

the

size,

shape

and

construction

of

the

room,

and

the

amount and

type

of

furniture,

rugs

and

draperies

present.

A

lack

of

bass

response

frequently

may

be

attributed

to

walls

of

thin

panel

construction,

large

openings

(e.g.,

doorways).

or

excessive

window

glass,

which

allow

low

fre-

quencies

to

pass

through

rather

than

reflecting

them

into

the

room.

The

overly

bright

sound

of

acoustically

"live"

rooms

(e.g.,

those

with

9

Bose Model 301 Owner's guide - Page 9

Rotate, Clockwise, Maximum, Reflected, Sound, Counter, Diagram, Positions, Direct, Energy, Control

Page 9 highlights