Bose 301 II Series User manual

SPECIFICATIONS

Driver Complement: One 8" long excursion woofer

Two 3" high sensitivity tweeters

Nominal Impedance: 8Ω

Dual Frequency™ Crossover: Woofer Transition 2.5kHz

Tweeter Transition 1.5kHz

Amplifier Power Requirements: 10 watts minimum

75 watts maximum

Cabinet: Walnut grain vinyl veneer

Dimensions: 10 1/2" H x 17" W x 9 1/2" D (27 x 43 x 24) cm

Weight: 18 1/2 lbs. (7.1 kg)

Shipping Weight: 40 lbs (18.18 kg)

PROPRIETARY INFORMATION

THIS DOCUMENT CONTAINS PROPRIETARY INFORMATION OF

BOSE®CORPORATION WHICH IS BEING FURNISHED ONLY FOR

THE PURPOSE OF SERVICING THE IDENTIFIED BOSE PRODUCT

BY AN AUTHORIZED BOSE SERVICE CENTER OR OWNER OF THE

BOSE PRODUCT, AND SHALL NOT BE REPRODUCED OR USED

FOR ANY OTHER PURPOSE.

Contents

Specifications................................................................................................................................... 1

Disassembly/Assembly Procedures .............................................................................................. 2

Test Procedures ............................................................................................................................... 3

Main Assembly Part List.................................................................................................................. 4

Figure 1. Exploded View .................................................................................................................. 4

Crossover Part List .......................................................................................................................... 5

Figure 2. Later Version Schematic Diagram .................................................................................... 5

Figure 3. Early Version Schematic Diagram .................................................................................... 5

Packaging Part List.......................................................................................................................... 5

DISASSEMBLY/ASSEMBLY PROCEDURES

Note: Numbers in parenthesis refer to call

outs in figure 1.

1. Front and Side Grille Removal

1.1 Grasp the grille (4) (3) by an edge and

pull it off.

2. Front and Side Grille Replacement

2.1 Line up the grille mounting feet with the

grille attachments (10) on the cabinet and

press the grille onto the cabinet.

3. Woofer Removal / Crossover Access

3.1 Perform procedure 1 first.

3.2 Remove the four screws (12) that

secure the woofer (1) to the cabinet.

3.3 Lift the woofer out of the cabinet and

cut the wires as close as possible to the

woofer terminals.

3.4 The crossover components are located

on the back wall of the cabinet.

4. Woofer Replacement

4.1 Attach the wires to the replacement

woofer (1). See the schematic diagram on

page 5 for the wiring configuration.

4.2 Replace the four screws (12) that

secure the woofer to the cabinet.

5. Tweeter Removal

5.1 Perform procedure 1 first.

5.2 Remove the screw (7) that secures the

tweeter to the tweeter mounting bracket (6).

5.3 Cut the wires as close as possible to

the tweeter terminals.

6. Tweeter Replacement

6.1 Attach the wires to the replacement

tweeter. Refer to the schematic diagram on

page 5 for the wiring configuration.

6.2 Replace the screw (7) that secures the

tweeter to the tweeter mounting bracket (6).

7. Terminal Cup Removal

7.1 Remove the four screws (15) that

secure the terminal cup (16) to the cabinet.

7.2 Cut the wires as close as possible to

the terminal cup.

8. Terminal Cup Replacement

8.1 Attach the wires to the replacement

terminal cup (16). Refer to the schematic

diagram on page 5 for the wiring configura-

tion.

8.2 Replace the four screws (15) that

secure the terminal cup to the cabinet.

9. Vertical Trim Strip Removal

9.1 Grasp an edge of the vertical trim strip

(9) an pull it off.

10. Vertical Trim Strip Replacement

10.1 Line up the vertical trim strip (9) with

the holes in the cabinet and press it into

place.

TEST PROCEDURES

1. Phase Test

1.1 Momentarily apply 8 ±1Vdc to the

speaker input terminals. Observe polarity

when connecting the dc power supply. The

woofer should move outward.

1.2 Momentarily apply the positive side of

an 8 ±1Vdc power supply to the red wire

that is attached to the tweeter. Connect the

negative side of the power supply to the

speaker's negative input terminal. The

tweeters should move outward.

2. Air Leak Test

2.1 Apply an 8Vrms, 45Hz signal to the

speaker input terminal.

2.2 Listen for air leaks around the woofer,

tweeter mounting brackets and the terminal

cup.

3. Rub and Tick Test

3.1 Apply an 8Vrms, 10Hz signal to the

speaker input terminals.

3.2 No extraneous noise such as rubbing,

scraping or ticking should be heard.

Note: To distinguish between normal

suspension noise and rubs or ticks, dis-

place the cone of the woofer slightly with

your fingers. If the noise can be made to go

away or get worse, it's a rub or tick and the

woofer should be replaced. If the noise

stays the same, it's normal suspension

noise and it will not be heard with program

material.

4. Power Sweep Test

4.1 Apply an 8Vrms, 10Hz signal to the

speaker input terminals.

4.2 Sweep the speaker from 10Hz to

3kHz.

4.3 Lower the applied voltage to 4Vrms

and continue to sweep the speaker to

5kHz.

4.4 Listen for any buzzes, rattles or other

extraneous noises from the speaker.

Replace any woofer or tweeter that fails

this test. Tighten any screws or redress any

wires that buzz.

MAIN ASSEMBLY PART LIST

Item

Number Description Part Number

1 Woofer 135372

2 Tweeter 130714 or 124618

3 Grille, Side, Tan

Grille, Side, Black

Grille, Side, White

Grille, Side, Green

Grille, Side, Blue

Grille, Side, Red

Grille, Side, Silver

120705-2

120705-3

120705-4

120705-5

120705-6

120705-7

120705-8

4 Grille, Front, Dark Brown

Grille, Front, Black

Grille, Front, White

Grille, Front, Green

Grille, Front, Blue

Grille, Front, Red

Grille, Front, Silver

120704-1

120704-3

120704-4

120704-5

120704-6

120704-7

120704-8

5 Screw, Bracket Mount, Hex Wash 108877

6 Tweeter Mounting Bracket 128501

7 Screw, Tweeter Mount, Mach, Hex

Wash 121441-08

8 Port 118752-0

9 Vertical Trim Strip 120707

10 Rubber Grille Attachment 117995

11 Trim Ring, Woofer 120709

12 Screw, Wood, #8 x 20 mm L 129027-12

13 Woofer Gasket 120715

14 Grille Mounting Foot 120706

15 Screw , SH Met, #6-20 x 5/8 103122-10

16 Terminal 120711

Figure 1. Exploded View

** Use Tweeter part number 124618 as an alternate for 130714. 10/06/00

CROSSOVER PART LIST

Description Part Number Note

3.4uf, 50V 106825 Match

7.5Ω119094-7R5 Match

3.7uf, 50V 107055 Boost

6.2Ω119094-6R2 Boost

3uf, 50V 104130 Cut

9.1Ω119094-9R1 Cut

2.4uf, 50V 104131 D Cut

13Ω119094-130 D Cut

RT1, Lamp 117805

WOOFER

C1 R1

RT1

UPPER

TWEETER

LOWER

TWEETER

Figure 2. Later Version Schematic Diagram

Figure 3. Early Version Schematic Diagram

PACKAGING PART LIST

Description Part Number Qty

Owner's Guide 120749 1

Carton 142253 1

Filler 129931 2

Bag 106595 1

Note: 1.5A, 250V fuse kit, part number 108938-4

WOOFER

C1 R1

UPPER

TWEETER

LOWER

TWEETER

Part Number 122115

301®Series II Direct/Reflecting®

Loudspeaker

BOSE CORPORATION

THE MOUNTAIN

FRAMINGHAM, MASSACHUSETTS USA 01701

SPECIFICATIONS AND FEATURES SUBJECT TO CHANGE WITHOUT NOTICE

P/N 122115 10/96: REV. 02 FOR TECHNICALASSISTANCE OR PART ORDERS, CALL 1-800-367-4008

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