Bose Panaray LT3202 III Mid/High User manual

©2006 Bose Corporation Reference Number 275484-SM Rev. 03
Service Manual
Panaray®LT Model
3202®III, 4402®III, 9402TM III, 9702®III,
MB24 III and MB12 III Loudspeakers

2
CONTENTS
CAUTION: The Bose®Panaray LT Loudspeakers
contain no user-serviceable parts. To prevent warranty infractions,
refer servicing to warranty service stations or factory service.
WARRANTY INFORMATION
The Bose Panaray LT Model 3202, 4402, 9402, 9702, MB24 and MB12 Series III
Loudspeakers are covered by a 5-year transferable limited warranty.
PROPRIETARY INFORMATION
THISDOCUMENTCONTAINSPROPRIETARYINFORMATIONOF
BOSE CORPORATION WHICH IS BEING FURNISHED ONLY FOR
THE PURPOSE OF SERVICING THE IDENTIFIED BOSE PRODUCT
BYANAUTHORIZED BOSE SERVICE CENTER OR OWNER OF
THE BOSE PRODUCT, AND SHALL NOT BE REPRODUCED OR
USED FOR ANY OTHER PURPOSE.
Warranty Information ...................................................................................................................................... 2
Specifications ............................................................................................................................................... 3-4
ProductDescription .........................................................................................................................................5
Part List Notes ..................................................................................................................................................5
Packing List, Panaray®LT 3202®III Loudspeaker ......................................................................................... 6
Figure1.Panaray LT3202III Loudspeaker Packaging View............................................................................6
Packing List, Panaray LT 4402®III Loudspeaker...........................................................................................7
Figure2.Panaray LT4402III Loudspeaker Packaging View............................................................................7
Packing List, Panaray LT 9402TM III Loudspeaker ....................................................................................... 8
Figure3.Panaray LT9402III Loudspeaker Packaging View............................................................................8
Packing List, Panaray LT 9702®III Loudspeaker...........................................................................................9
Figure4.Panaray LT9702III Loudspeaker Packaging View............................................................................9
Packing List, Panaray LT MB24 III Bass Loudspeaker................................................................................ 10
Figure5. Panaray LTMB24 IIIBassLoudspeaker Packaging View ............................................................... 10
Packing List, Panaray LT MB12 III Bass Loudspeaker................................................................................ 11
Figure6. Panaray LTMB12 IIIBassLoudspeaker Packaging View ............................................................... 11
Main Part List, Panaray LT 3202®III Loudspeaker (see Figure 7).............................................................. 12
Figure7.PanarayLT3202IIILoudspeaker Exploded View............................................................................ 12
Main Part List, Panaray LT 4402®III Loudspeaker (see Figure 8).............................................................. 13
Figure8.PanarayLT4402IIILoudspeaker Exploded View............................................................................ 13
Main Part List, Panaray LT 9402TM III Loudspeaker (see Figure 9) ............................................................ 14
Figure9.PanarayLT9402TM III LoudspeakerExploded View.......................................................................14
Main Part List, Panaray LT 9702®III Loudspeaker (see Figure 10) ............................................................ 15
Figure10.PanarayLT9702IIILoudspeakerExploded View.......................................................................... 15
Main Part List, Panaray LT MB24 III Bass Loudspeaker ............................................................................. 16
Figure11.Panaray LTMB24 III BassLoudspeaker ExplodedView ............................................................... 16
Main Part List, Panaray LT MB12 III Bass Loudspeaker ............................................................................. 17
Figure12. Panaray LTMB12 IIIBass LoudspeakerExploded View ............................................................... 17
DisassemblyProcedures .......................................................................................................................... 18-20
Test Procedures ........................................................................................................................................ 21-22
Model 4402, 9402, 9702, MB24 and MB12 Series III Speaker Test Cable ................................................... 21
Model 3202 III Speaker Test Cable............................................................................................................... 21
Loudspeaker Wiring Diagrams................................................................................................................ 22-24
Accessories Used With the Panaray LT Series III Loudspeakers............................................................... 24
High Frequency Compression Driver Diaphragm Replacement Procedure ............................................. 25
Service Manual Revision History ................................................................................................................. 26

3
SPECIFICATIONS
MECHANICAL
External dimensions, single speaker
9702®III: 42.2" H x 22.5" W x 18.0" D (1072 x 572 x 368 mm)
9402TM III: 34.6" H x 22.5" W x 23.7" D (879 x 572 x 604 mm)
4402®III: 34.0" H x 18.5" W x 24.0" D (884 x 471 x 610 mm)
3202®III: 42.2" H x 22.5" W x 35.9" D (1072 x 573 x 913 mm)
MB24III: 28.1" H x 20.0" W x 25.5" D (712 x 508 x 647 mm)
MB12III: 14.5" H x 20.0" W x 25.5" D (368x 508 x 647 mm)
System weight, unpackaged single speaker
9702 III: 95.5 lbs (43 kg)
9402 III: 113.0 lbs (51 kg)
4402 III: 111.1 lbs (50 kg)
3202 III: 194.0 lbs (88 kg)
MB24III: 129.0 lbs (59 kg)
MB12III: 65.0 lbs (29.5 kg)
System weight, packaged single speaker
9702 III: 123.5 lbs (56 kg)
9402 III: 145.5 lbs (66 kg)
4402 III: 141.1 lbs (64 kg)
3202 III: 240.7 lbs (109 kg)
MB24III: 147.0 lbs (67 kg)
MB12III: 74 lbs (34 kg)
ELECTRICAL
Driver Complement
9702 III: Mid Freq: two V2 drivers
High Freq: one 1.4" compression driver
9402 III: Mid Freq: two V2 drivers
High Freq: one 1.4" compression driver
4402 III: Mid Freq: two V2 drivers
High Freq: one 1.4" compression driver
3202 III: Mid Freq: four V2 drivers
High Freq: one 1.4" compression driver
MB24III: Two 12" low frequency drivers
MB12III: One 12" low frequency driver
Sensitivity (dB SPL, 1Watt at 1 meter)
9702 III: Mid 105, High 104, Passive 104
9402 III: Mid 106, High 106, Passive 106
4402 III: Mid 106, High 107, Passive 108
3202 III: Mid 111, High 107, Passive 110
MB24III: Parallel Mode 94, Discrete Mode 91 (per driver)
MB12III: Discrete Mode 91

4
SPECIFICATIONS
ELECTRICAL (Continued)
Maximum sound pressure level (dB SPL) - pink noise per IEC 268-5
9702 III: Mid 127, High 123, Passive 126
9402 III: Mid 128, High 125, Passive 128
4402 III: Mid 126, High 128, Passive 130
3202 III: Mid 132, High 130, Passive 135
MB24III: Parallel Mode 123, Discrete Mode 123
MB12III: Discrete Mode 117
Frequency Range
9702®III: 180Hz - 16kHz (+ 3dB)
9402TM III: 180Hz - 16kHz (+ 3dB)
4402®III: 180Hz - 16kHz (+ 3dB)
3202®III: 200Hz - 16kHz (+ 3dB)
MB24III: 40Hz - 250Hz (+ 3dB)
MB12III: 40Hz - 250Hz (+ 3dB)
Loudspeaker Impedance
Compression Driver: 8 Ohms
Vee-Two: 2 Vee-Two's are wired in series for 8 Ohms
MB24 III Bass Drivers: 8 Ohms each
MB12 III Bass Driver: 8 Ohms
Maximum Power Handling, Watts
9702 III: Bi-amped: Mid 140, High 75 Passive: 140
9402 III: Bi-amped: Mid 140, High 75 Passive: 140
4402 III: Bi-amped: Mid 140, High 75 Passive: 140
3202 III: Bi-amped: Mid 280, High 75 Passive: 280
Bi-amped / Dual Midrange: Mid1 140; Mid2 140; High 75
MB24III: Parallel Mode 800, Discrete Mode 400 each driver
MB12III: Discrete Mode 400

5
PRODUCT DESCRIPTION
The Bose®Panaray®LT Series III Loudspeakers are designed to provide quality sound in ven-
ues where speaker-to-listener distance, room reverberation time, ambient noise and high SPL
requirements are key factors. Typical installations include performing arts facilities, theaters,
auditoriums, houses of worship, stadiums and arenas.
The Panaray LT Series III loudspeakers are a direct replacement for the Panaray LT Series II
loudspeaker in indoor spaces. The Panaray LT Series III loudspeaker does not meet the require-
ments for permanent outdoor installation.
The Panaray LT Series III loudspeakers utilize a high frequency compression driver and two or
more V2 assemblies for midrange. The MB24 bass module contains two 12 inch bass drivers.
The MB12 bass module contains one 12 bass driver.
The Panaray LT Series III loudspeakers come standard with a perforated metal grille and are
available in both black and white versions.
PART LIST NOTES
1. This part is not normally available from Customer Service.Approval from the Field Service
Manager is required before ordering.
2. The individual parts located on the PCBs are listed in the Electrical Part List.
3. This part is critical for safety purposes. Failure to use a substitute replacement with the
same safety characteristics as the recommended replacement part might create shock, fire
and/or other hazards.
4. This part is referenced for informational purposes only. It is not stocked as a repair part.
Refer to the next higher assembly for a replacement part.

6
PACKING LIST
Panaray®LT 3202®III Loudspeaker
Figure 1. Panaray LT 3202 III Loudspeaker Packaging View
Item
Number
Description Bose
®
Part
Number
Vendor Part Number Qty Note
Kit, Carton, Model 3202 III,
includes: 276855 - 1
1 PP Cover - LT3202-III-5-104 2 4
2 Triangle Paper - LT3202-III-5-102 2 4
3 PP Foam Middle - LT3202-III-5-106 1 4
4 Triangle Paper - LT3202-III-5-101 2 4
5 Carton - LT3202-III-5-107 1 4
6 Loudspeaker, Model 3202 III
(not included with carton kit) 275484 LT3202 III 1 4
7 PE Bag, 1850x1430x0.3 - LT3202-III-5-104 1 4
- Owner's Guide, Models 3202,
4402, 9402 and 9702 III 276859 LT9702-III-5-108 1

7
PACKING LIST
Panaray®LT 4402®III Loudspeaker
Figure 2. Panaray LT 4402 III Loudspeaker Packaging View
Item
Number
Description Bose
®
Part
Number
Vendor Part Number Qty Note
Kit, Carton, Model 4402 III,
includes: 276856 - 1
1 PP Cover - LT4402-III-5-103 2 4
2 Triangle Paper - LT4402-III-5-102 2 4
3 PP Foam Middle - LT4402-III-5-106 1 4
4 Triangle Paper - LT4402-III-5-101 2 4
5 Carton - LT4402-III-5-107 1 4
6 Loudspeaker, Model 4402 III
(not included with carton kit) 275485 LT4402 III 1 4
7 PE Bag, 1850x1430x0.3 - LT9702-III-5-108 1 4
- Owner's Guide, Models 3202,
4402, 9402 and 9702 III 276859 - 1

8
PACKING LIST
Panaray®LT 9402TM III Loudspeaker
Figure 3. Panaray LT 9402 III Loudspeaker Packaging View
Item
Number
Description Bose
®
Part
Number
Vendor Part Number Qty Note
Kit, Carton, Model 9402 III,
includes: 276857 - 1
1 PP Cover - LT9402-III-5-105 2 4
2 Triangle Paper - LT9402-III-5-101 2 4
3 PP Foam Middle - LT9402-III-5-106 1 4
4 Carton - LT9402-III-5-107 1 4
5 Loudspeaker, Model 9402 III
(not included with carton kit) 263940 LT9402 III 1 4
6 PE Bag, 1850x1430x0.3 - LT9702-III-5-108 1 4
- Owner's Guide, Models 3202,
4402, 9402 and 9702 III 276859 - 1

9
PACKING LIST
Panaray®LT 9702®III Loudspeaker
Figure 4. Panaray LT 9702 III Loudspeaker Packaging View
Item
Number
Description Bose
®
Part
Number
Vendor Part Number Qty Note
Kit, Carton, Model 9702 III,
includes: 276858 - 1
1 PP Cover - LT9702-III-5-104 2 4
2 Triangle Paper - LT9702-III-5-101 2 4
3 PP Foam Middle - LT9702-III-5-105 1 4
4 Carton - LT9702-III-5-106 1 4
5 Loudspeaker, Model 9702 III
(not included with carton kit) 275486 LT9702 III 1 4
6 PE Bag, 1850x1430x0.3 - LT9702-III-5-107 1 4
- Owner's Guide, Models 3202,
4402, 9402 and 9702 III 276859 - 1

10
1
2
6
4
6
3
7
5
6
4
6
5
PACKING LIST
Panaray®LT MB24 III Bass Loudspeaker
Figure 5. Panaray LT MB24 III Bass Loudspeaker Packaging View
Item
Number
Description Bose
®
Part
Number
Vendor Part Number Qty Note
Kit, Carton, Model MB24 III,
includes: - - 1
1 PE Bag, 1600 x 1160 x 0.1mm - LTMB24-III-2-104 1 4
2 PE Bag, 240 x 350 x 0.1mm - LT9702-III-5-102 1 4
3 PP Foam, 672 x 790 x 150mm - LTMB24-III-2-103 2
4 PP Foam, Middle,
804 x 686 x 80mm - LTMB24-III-2-106 1
5 Paper Cover,
808 x 676 x 157mm - LTMB24-III-2-105 2
6 Triangle Paper,
790 x 236 x 80mm - LTMB24-III-2-102 4
7 Carton, MB24 - LTMB24-III-2-101 1
- Manual, Users 278247 - 1

11
PACKING LIST
Panaray®LT MB12 III Bass Loudspeaker
Figure 6. Panaray LT MB12 III Bass Loudspeaker Packaging View
1
2
3
4
5
2
6
Item
Number
Description Bose
®
Part
Number
Vendor Part Number Qty Note
Kit, Carton, Model MB24 III,
includes: - - 1
1 Paper Cover,
774x636x107mm - LTMB12-III-2-103 1
2 Cushioning Material,
770x632x100mm - LTMB12-III-2-102 2
3 Manual, Users 278247 BOSE/LT_MB12 1
4 PE Bag, 1200x1260x0.04mm - BS1000 1 4
5 LT MB12 III Loudspeaker REF - 1
6 Carton, MB12 309574 LTMB12-III-2-101 1

12
MAIN PART LIST
Panaray®LT 3202®III Loudspeaker (see Figure 7)
Figure 7. Panaray®LT 3202®III Loudspeaker Exploded View
1
2
3
4
5
6
7
8 9 10 11 12 13 14 15 16 17
18
19
2
Part NumberItem
Number
Description
Black White
Qty
Note
1 Logo, Panaray LT - - 1 4
2 Kit, Grille Screw, TA4x15 (14 screws per kit) 297502 297503 1
3 Cap, Spring - - 1 4
4 Spring, Logo - - 1 4
5 Clip, Retaining, Logo - - 1 4
6 Grille Assembly, includes screws, tape, logo,
fastener and spring 298171 298556 1
7 Gasket, Grille, consists of 3 sections 274622 274622 1 4
8 Gasket, Compression Driver 263911 263911 1 4
9 Disk, Align, Compression Driver 263912 263912 1 4
10 Screw, KM4x12 - - 10 4
11 Screw, KM6x12 - - 4 4
12 Plate, Mount, Compression Driver 276849 276849 1 4
13 Screw, TM6x30 - - 20 4
14 Compression Driver, 1.4” 276860 276860 1
15 Gasket, Rear Panel 298558 298558 1 4
16 Panel, Rear 273489 273489 1 4
17 Screw, TM4x15 - - 12 4
18 VEE Two Assembly (includes drivers) 298172 298559 4
19 Input Panel with Crossover PCB 297510 298560 1
- Gasket, Input Panel 274628 274628 2 4
- Compression Driver Replacement Diaphragm 276861 276861 1
- Logo Kit with tape, fastener and spring 297504 297505 1
- Screw, Hang Point, 3/8” x 16 298591 299316 16

13
MAIN PART LIST
Panaray®LT 4402®III Loudspeaker (see Figure 8)
Figure 8. Panaray®LT 4402®III Loudspeaker Exploded View
1
2
3
45678910 11 12 13
14
15
9
16
17
Part NumberItem
Number
Description
Black White
Qty
Note
1 Grille Assembly, includes:
screws, tape, logo, fastener and spring 297521 298580 1
2 Gasket, Grille (consists of three sections) - - 1 4
3 Kit, Grille Screw, TA4x15 (14 screws per kit) 297502 297503 1
4 Gasket, Compression Driver 263911 263911 1 4
5 Disk, Alignment, Compression Driver 263912 263912 1 4
6 Screw, KM4x12 - - 4 4
7 Screw, KM6x12 - - 4 4
8 Plate, Mount, Compression Driver 276849 276849 1
9 Screw, TM6x30 - - 14 4
10 Compression Driver 276860 276860 1
11 Gasket, Panel, 9702 263909 263909 1 4
12 Panel, Rear 263908 - 1 4
13 Screw, TM4x15 - - 12 4
14 VEE Two Assembly (includes drivers) 298172 298559 2
15 Input Panel with Crossover PCB 297523 298583 1
16 Screw, KM3x12 - - 4 4
17 Gasket, Input Panel 263920 263920 2 4
- Compression Driver Replacement Diaphragm 276861 276861 1
- Logo Kit with tape, fastener and spring 297504 297505 1
- Screw, Hang Point, 3/8” x 16 298591 299316 16

14
MAIN PART LIST
Panaray®LT 9402TM III Loudspeaker (see Figure 9)
Part NumberItem
Number
Description
Black White
Qty
Note
1 Kit, Grille Screw, TA4x15 (14 screws per kit) 297502 297503 10
2 Logo, Panaray LT - - 1 4
3 Grille Assembly (includes screws, tape, logo,
fastener and spring) 297525 298584 1
4 Cap, Spring - - 1 4
5 Spring, Logo - - 1 4
6 Clip, Retaining, Logo - - 1 4
7 Gasket, Grille
(consists of three sections) - - 1 4
8 Gasket, Compression Driver 263911 263911 1 4
9 Disk, Alignment, Comp Driver 263912 263912 1 4
10 Screw, KM4x12 - - 4 4
11 Screw, KM6x12 - - 4 4
12 Plate, Mount, Compression Driver 276849 276849 1
13 Screw, TM6x30 - - 14 4
14 Compression Driver 276860 276860 1
15 Gasket, Panel 263909 263909 1 4
16 Panel, Rear 263908 - 1 4
17 Screw, TM4x15 - - 12 4
18 VEE Two Assembly (includes drivers) 298172 298559 2
19 Panel, Input, with Crossover 297526 298585 1
- Compression Driver Replacement Diaphragm 276861 276861 1
- Logo Kit (includes tape, fastener and spring) 297504 297505 1
- Screw, Hang Point, 3/8” x 16 298591 299316 16
Figure 9. Panaray®LT 9402TM III Loudspeaker Exploded View
1
2
3
4
5
6
7
1
8 9 10 11 12 13 14 15 16
17
18
19

15
MAIN PART LIST
Panaray®LT 9702®III Loudspeaker (see Figure 10)
Part NumberItem
Number
Description
Black White
Qty
Note
1 Grille Assembly (includes: screws, tape, logo,
fastener and spring) 297527 298586 1
2 Kit, Grille Screw, TA4x15(14 screws per kit) 297502 297503 1
3 Clip, Retaining, Logo - - 1 4
4 Spring, Logo - - 1 4
5 Cap, Spring - - 1 4
6 Logo, Panaray LT - - 1 4
7 Gasket, Grille (consists of three sections) - - 1 4
8 Gasket, Compression Driver 263911 263911 1 4
9 Disk, Alignment, Comp Driver 263912 263912 1 4
10 Screw, KM4x12 - - 4 4
11 Screw, KM6x12 - - 4 4
12 Plate, Mount, Compression Driver 276849 276849 1
13 Screw, TM6x30 - - 14 4
14 Compression Driver 276860 276860 1
15 Gasket, Panel, 9702 263909 263909 1 4
16 Panel, Rear 263908 - 1 4
17 Screw, TM4x15 - - 12 4
18 VEE Two Assembly (includes drivers) 298172 298559 2
19 Panel, Input, with Crossover 297528 298587 1
- Compression Driver Replacement Diaphragm 276861 276861 1
- Logo Kit (includes tape, fastener and spring) 297504 297505 1
- Screw, Hang Point, 3/8” x 16 298591 299316 16
Figure 10. Panaray®LT 9702®III Loudspeaker Exploded View
1
2
3
4
5
6
7
891011 12 13 14 15
16
17
18
19

16
MAIN PART LIST
Panaray®LT MB24 III Bass Loudspeaker
3
1
2
4
5
67
8
9
Figure 11. Panaray LT MB24 III Bass Loudspeaker Exploded View
Part NumberItem
Number
Description
Black White
Qty
Note
1 Gasket, Grille, MB24 Bass Module - - 1 4
2 Grille Assembly, includes screws, logo, tape,
fastener and spring 297514 298561 1
3 Logo Kit, includes tape, fastener and spring 276848 297505 1
4 Grille Screw Kit (14 screws) 297502 291904 1
5 Gasket, Woofer - - 2 4
6 Gasket, Input Panel - - 1 4
7 Input Panel Kit 297518 298570 1
8 Woofer Assembly, 12 inch, TBX 297519 297519 2
9 Screw, Woofer - - 16 4

17
MAIN PART LIST
Panaray®LT MB12 III Bass Loudspeaker
Figure 12. Panaray LT MB12 III Bass Loudspeaker Exploded View
1
2
3
4
567
8, 9
Part NumberItem
Number
Description
Black White
Qty
Note
1 Gasket, Grille, MB12 Bass Module - - 1 4
2 Grille Screw Kit (14 screws) 297502 297503 1
3 Grille Assembly, (includes screws and logo) 296721 298588 1
4 Logo Kit, includes tape, fastener and spring 297504 297505 1
5 Screw, Woofer - - 8 4
6 Woofer Assembly, 12 inch, TBX 297519 297519 1
7 Gasket, Woofer - - 1 4
8 Gasket, Input Panel - - 1 4
9 Input Panel Kit 297518 298589 1

18
DISASSEMBLY PROCEDURES
CAUTION: The rear of the Panaray®LT
loudspeakers can become extremely hot
during normal use. Do not attempt to service
the loudspeakers until they have cooled to
room temperature.
Model 3202®III Loudspeaker
Note: Refer to Figure 7 for the following
procedures.
1. Grille Removal
1.1 Remove the fourteen screws (2) that
secure the grille assembly (6) to the cabinet.
1.2 Lift the grille assembly off of the cabinet.
Retain the grille gasket (7) for re-use.
2. Logo Removal
2.1 Remove the grille using procedure 1
above.
2.2 On the back of the grille, carefully re-
move the slotted washer that retains the
spring and spacer against the back of the
grille. Note the direction the spacer faces.
Slide the spring and spacer off of the logo
post.
3. Compression Driver Removal
3.1 Remove the twelve screws (18) that
secure the rear panel (16) to the cabinet. Lift
off the rear panel. Retain the gasket (15) for
re-use.
3.2 Remove the four screws (13) that secure
the Compression Driver Mounting Plate (12)
to the cabinet. Lift the compression driver
(14) out of the cabinet. Make a note of the
wiring configuration, and disconnect the
wires from the compression driver.
3.3 Remove the four screws (11) that secure
the compression driver to the mounting plate.
Lift off the driver.
4. VEE TwoAssembly Removal
4.1 Remove the four screws that secure the
assembly to the cabinet. These screws are
located at the four corners of the VEE Two
assembly. Do not remove the other screws
around the casting. Carefully lift the assem-
bly out of the cabinet. Make a note of the
wiring configuration, and disconnect the two
wires from the connector.
5. Input Panel Assembly Removal
5.1 Remove the four screws that secure the
input panel assembly to the cabinet. Discon-
nect the cables that plug into the PCB. Lift
out the assembly.
Model 4402®III Loudspeaker
Note: Refer to Figure 8 for the following
procedures.
1. Grille Removal
1.1 Remove the fourteen screws (3) that
secure the sides of the grille assembly (1) to
the cabinet. Remove the six screws (3) that
secure the grille assembly to the front of the
cabinet.
1.2 Lift the grille assembly off of the cabinet.
The gasket should remain adhered to the
cabinet.
2. Logo Removal
2.1 Remove the grille using procedure 1
above.
2.2 On the back of the grille, carefully re-
move the slotted washer that retains the
spring and spacer against the back of the
grille. Note the direction the spacer faces.
Slide the spring and spacer off of the logo
post.
2.3 Lift the logo off of the grille.

19
DISASSEMBLY PROCEDURES
3. Compression Driver Removal
3.1 Remove the twelve screws (13) that
secure the rear panel (12) to the cabinet. Lift
off the rear panel. The gasket should remain
adhered to the cabinet.
3.2 Make a note of the wiring configuration,
and disconnect the wires from the compres-
sion driver. Remove the four screws (9) that
secure the Compression Driver Mounting
Plate (8) to the cabinet. Lift the compression
driver (10) out of the cabinet.
4. VEE TwoAssembly Removal
4.1 Remove the four screws that secure the
assembly to the cabinet. These screws are
located at the four corners of the VEE Two
assembly. Do not remove the other screws
around the casting. Carefully lift the assem-
bly out of the cabinet. Make a note of the
wiring configuration, and disconnect the two
wires from the connector.
5. Input Panel Assembly Removal
5.1 Remove the four screws that secure the
input panel assembly to the cabinet. Lift the
assembly away from the cabinet. Be careful
not to damage any wires.
Model 9402TM III Loudspeaker
Note: Refer to Figure 9 for the following
procedures.
1. Grille Removal
1.1 Remove the fourteen screws (1) that
secure the grille assembly (3) to the cabinet.
1.2 Lift the grille assembly off of the cabinet.
The gasket should remain adhered to the
cabinet.
2. Logo Removal
2.1 Remove the grille using procedure 1
above.
2.2 On the back of the grille, carefully re-
move the slotted washer that retains the
spring and spacer against the back of the
grille. Note the direction the spacer faces.
Slide the spring and spacer off of the logo
post.
2.3 Lift the logo off of the grille.
3. Compression Driver Removal
3.1 Remove the twelve screws (17) that
secure the rear panel (16) to the cabinet.
Lift off the rear panel. The gasket should
remain adhered to the cabinet.
3.2 Make a note of the wiring configuration,
and disconnect the wires from the compres-
sion driver. Remove the four screws (13)
that secure the Compression Driver Mount-
ing Plate (12) to the cabinet. Lift the com-
pression driver (14) out of the cabinet.
4. VEE TwoAssembly Removal
4.1 Remove the four screws that secure the
assembly to the cabinet. These screws are
located at the four corners of the VEE Two
assembly. Do not remove the other screws
around the casting. Carefully lift the assem-
bly out of the cabinet. Make a note of the
wiring configuration, and disconnect the two
wires from the connector.
5. Input Panel Assembly Removal
5.1 Remove the four screws that secure the
input panel assembly to the cabinet. Lift the
assembly away from the cabinet. Be careful
not to damage any wires.

20
DISASSEMBLY PROCEDURES
Model 9702®III Loudspeaker
Note: Refer to Figure 10 for the following
procedures.
1. Grille Removal
1.1 Remove the fourteen screws (2) that
secure the grille assembly (1) to the cabinet.
1.2 Lift the grille assembly off of the cabinet.
The gasket should remain adhered to the
cabinet.
2. Logo Removal
2.1 Remove the grille using procedure 1
above.
2.2 On the back of the grille, carefully re-
move the slotted washer that retains the
spring and spacer against the back of the
grille. Note the direction the spacer faces.
Slide the spring and spacer off of the logo
post.
2.3 Lift the logo off of the grille.
3. VEE TwoAssembly Removal
3.1 Remove the four screws that secure the
assembly to the cabinet. These screws are
located at the four corners of the VEE Two
assembly. Do not remove the other screws
around the casting. Carefully lift the assem-
bly out of the cabinet. Make a note of the
wiring configuration, and disconnect the two
wires from the connector.
4. Input Panel Assembly Removal
4.1 Remove the four screws that secure the
input panel assembly to the cabinet. Discon-
nect the cables that plug into the PCB. Lift
out the assembly.
VEE Two Driver Removal Procedure
1. Remove the VEE Two assembly using the
appropriate disassembly procedures for the
speaker under repair.
2. Place the VEE Two assembly on a flat
surface so that the aluminum casting with
the Bose logo is facing upward.
3. Using a Phillips-head screwdriver, remove
all of the screws around the perimeter of the
casting. Carefully lift off the casting. The
drivers will be exposed.
4. Make a note of the wiring configuration,
and cut the wires as close to the terminals
as possible.
5. Remove the three screws that secure the
driver into the housing. Lift it out of the
housing.
Re-assembly note: When installing the
new driver, ensure that the gasket for the
driver and the gasket for the aluminum
casting are correctly positioned to provide
an airtight seal after re-assembly.
Model MB24 and MB12 III Bass Loud-
speakers
Refer to Figure 11 or 12, as appropriate,
for the following procedures.
1. Grille Removal
1.1 Using a Phillips-head screwdriver, re-
move the screws that secure the grille to the
enclosure. Lift off the grille.
2. Driver Removal
2.1 Perform procedure 1 above.
2.2 Using a Phillips-head screwdriver, re-
move the 8 screws that secure the driver to
the enclosure.
2.3 Lift the driver out of the enclosure. Make
a note of the wiring configuration and cut the
wires as close to the terminals as possible.
Re-assembly Note: Be sure that the driver
gasket is properly aligned to provide an
airtight seal. If the gasket is damaged, use a
new one.