Bose 301 Sonata Посібник користувача - Сторінка 9

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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 АМО 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 ofthe high frequency

ROTATE CLOCKWISE FOR

MAXIMUM REFLECTED SOUND

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

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