Bose 301 User Manual download pdf (Page 4)

1. INTRODUCTION

Thank you for purchasing the BOSE Model 301 Direct/Reflecting®

speaker system. Your Model 301s are the product of many years of

BOSE research and dedication to the art of bringing superb musical

reproduction into your home.

PLEASE TAKE TIME TO READ THIS MANUAL CAREFULLY. It will

help you obtain the full benefits of the Model 301's unique design.

2. UNPACKING INSTRUCTIONS

Two Model 301 speakers, marked "Part 1” and "Part 2." are

packed in a single shipping carton. Unpack both speakers care

fully, saving the carton and packing materials for possible trans

portation or shipment at a later date.

If either of the speakers has visible damage when you unpack it.

do not place the damaged speaker(s) in operation. Repack the

speaker(s) in the original carton with the complete packing

material and notify your dealer immediately.

WARNING — DO NOT HANDLE THE SPEAKERS BY THE FOAM

GRILLE. GRASP ONLY THE CABINET WHEN MOVING OR

PLACING THE SPEAKER.

3. DESIGN FEATURES

The BOSE Model 301 Direct/Reflecting loudspeaker incorporates

several features that make its operation and placement different

from other loudspeakers. The exceptional performance of the

Model 301, to a great degree, can be attributed to Asymmetrical

Design, the Direct Energy Control, and a Dual Frequency Crossover

Network.

ASYMMETRICAL DESIGN The Asymmetrical Design of the

Model 301 provides a high proportion of reflected sound at high

frequencies and contributes to the exceptionally spacious stereo

phonic reproduction. To provide balanced spatial properties in

stereo reproduction, the Model 301 stereo pair is designed so

that the speaker used on the left-hand side of the room (this

speaker is called "Part 1") is a mirror irnage of the speaker on the

right-hand side (this speaker is called "Part 2").

The Asymmetrical Design and mirror image construction of the

Model 301 are shown in Diagram 1 (page 5). The tweeters direct

most of their energy toward the side walls of the room. The side

walls reflect high frequency energy uniformly throughout the

listening area, resulting in a stereo image extending from one wall

of the room to the other (Diagram 2. page 6). The advantage of

this design is that minimum reliance is placed on the rear wall of

the room for providing reflections. This maximizes the flexibility

of placement of the loudspeaker.

DIRECT ENERGY CONTROL This control, located at the top of

the cabinet, allows you to select the proportion of direct to re

flected sound at high frequencies to produce the optimum spatial

characteristics for your particular room.

If, for example, the side walls of the room are absent, too far away,

or covered by absorbing material.* the control can be set to provide

predominantly direct sound at high frequencies. A predominance of

direct sound results in a stereo localization of sounds primarily to

the area between the two speakers. Sometimes this more “inti

mate” sound is preferred for soloists and small groups.

if a reflecting side wall is present, and a more spacious sound

presentation is desired (such as for an orchestra), the control can

be set to provide a larger proportion of reflected sound at high

frequencies. This results in sound that actually extends beyond

the spacing of the speakers.

DUAL FREQUENCY CROSSOVER NETWORK Contrary to tradi

tional design philosophies, the crossover network of the Model

301 deliberately overlaps the response of the woofer and tweeter

by over an octave, and adjusts the amplitude and phase response

of the woofer and tweeter to provide exactly complementary

‘Any surface that feels hard, such as wood, glass, wallboard,

plaster or brick, is a good reflector. A soft surface, such as

acoustic tile, drapery, or upholstered furniture, will absorb sound.

Bose 301 User Manual Page 4

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