Bose 301 User Manual download pdf (Page 9)

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

C. Adjustment of the Direct Energy Control

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 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

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