Bose LT 4402, LT MB24 III, LT 9702, LT 9402TM User Manual

Bose

®

Panaray

®

LT Series III Loudspeakers

Reference Guide

Declaration of Conformity

Bose

Corporation, The Mountain, Framingham, MA 01701-9168 USA

acknowledge our sole responsibility, that the product:

Declaration of Conformity

We, the offerer:

Kind of equipment: Loudspeaker
Type designation: Panaray

Panaray LT 4402
Panaray LT 9402
Panaray LT 9702

®

LT 3202

®

III Loudspeaker System

®

III Loudspeaker System

TM

III Loudspeaker System

®

III Loudspeaker System

Panaray LT MB24 III Modular Bass Loudspeaker System

in accordance with EMC Directive 89/336/EEC and Article 10(1) of the Directive,

is in compliance with the following norm(s) or document(s)

Technical regulations: EN55103-1, EN5103-2

Accredited by Bose Corporation

18 June 2004 Nic Merks

Bose Products B.V Vice President, Bose Europe
Nijverheidstraat 8, 1135 GE Edam Manufacturer s authorized EU representative
The Netherlands

2

Contents

Safety Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

Mounting Guidelines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

How to Use This Manual . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Mechanical Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

LT 3202
LT 4402

LT 9402™-III Loudspeaker . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

LT 9702
LT MB24-III

Acoustical Specifications and Wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

Recommended Wire Gauges . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

Internal Configurations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

To configure your LT 9702-III, LT 9402-III, or LT 4402-III loudspeaker: . . . . . . . . . . . . . . . . . . 13

To reconfigure your LT 3202-III loudspeaker (only): . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

To reconfigure your LT MB24-III modular bass loudspeaker: . . . . . . . . . . . . . . . . . . . . . . . . . . 15

LT 3202-III Loudspeaker Product Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

LT 3202-III Acoustical Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

LT 3202-III Loudspeaker Configurations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

LT 3202-III Loudspeaker Active Equalization Curves . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

LT 4402-III Loudspeaker Product Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

LT 4402-III Acoustical Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

LT 4402-III Loudspeaker Configurations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

LT 4402-III LoudspeakerActive Equalization Curves . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

LT 9402-III LoudspeakerProduct Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

LT 9402-III Acoustical Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

LT 9402-III Loudspeaker Configurations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

LT 9402-III LoudspeakerActive Equalization Curves . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

LT 9702-III LoudspeakerProduct Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

LT 9702-III Acoustical Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

LT 9702-III Loudspeaker Configurations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

LT 9702-III LoudspeakerActive Equalization Curves . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

LT MB24 Loudspeaker Product Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

LT MB24-III Acoustical Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

LT MB24-III Loudspeaker Configurations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

Active Equalization . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

Other methods of providing active equalization . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

LT Series III Mid/High Loudspeakers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

LT MB24-III Modular Bass Loudspeaker: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

Service Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

Panaray

Painting Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

To Replace the t1.4hp High-frequency Compression Driver in the Panaray LT 3202-III,

To Replace the t1.4hp High-frequency Compression Driver Diaphragm . . . . . . . . . . . . . . . . . . 30

To Replace the V-2 Mid-frequency Driver in the Panaray LT 3202-III . . . . . . . . . . . . . . . . . . . . 32

To Replace the V-2 Mid-frequency Driver in the Panaray LT 4402-III,

To Replace the 12" Woofer in the Panaray LT MB24-III Modular Bass Loudspeaker . . . . . . . . 34

Driver and Electronics Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .35

LT 3202-III Loudspeaker . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35

LT 4402-III Loudspeaker . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36

LT 9402-III Loudspeaker . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37

LT 9702-III Loudspeaker . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38

LT MB24-III Loudspeaker . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39

®

-III

Loudspeaker . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

®

-III

Loudspeaker . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

®

-III

Loudspeaker . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

Modular Bass Loudspeaker . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

®

LT Replacement Parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

LT 4402-III, LT 9404-III or LT 9702-III Loudspeakers . . . . . . . . . . . . . . . . . . . . . . . . . . 29

LT 9402-III or LT 9702

-III

Loudspeakers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33

3

Safety Information

Safety Information

Please read this safety information before installing, connecting, or operating the Bose

®

Panaray

®

LT loudspeakers.

Read the instructions.

Read and keep all safety and operating instructions for future reference, including this manual.

Follow cautions.

For your safety, follow all cautions and warnings in this manual and on the units.

Protect cables.

Always route cables to avoid pinching or cutting by heavy or sharp objects.

Follow the mounting guidelines.

Mount the loudspeaker cabinets according to the instructions in the Mechanical Specifications section of this manual.
Failure to do so may result in permanent damage to the system components or physical injury to anyone near the system.

WARNING:
WARNING:

This system is capable of supplying extremely high sound pressure levels (SPL).

The rear of the Panaray LT loudspeakers can become very hot during normal use. Do not attempt to service or
move an LT loudspeaker until the rear of the loudspeaker has cooled. Turn down volume and turn off the power amplifier
before connecting the loudspeaker.

WARNING:

All Panaray LT loudspeakers require active equalization. Do not operate the loudspeakers without the proper
active equalization for the particular loudspeaker and operating configuration. Failure to do so may result in permanent
damage.

4

Mounting Guidelines

WARNING:

permanent or seasonal use. Such mountings, typically in overhead locations, involve risk of personal injury if either
the mounting system or the loudspeaker attachment fails. Installation of the mounting system must be performed in
accordance with all applicable building codes including local codes. Consult the local authority before installing this
product.

The Panaray

Safety Information

®

LT Series loudspeakers must be attached to brackets or other mounting surfaces for

The LT loudspeaker installation requires the use of either Bose
products. While Bose Corporation cannot be held responsible for the proper design and
use of non-Bose mounting systems, we offer the following information and guidelines for
the permanent installation of your Panaray LT loudspeakers:

• Obtain your mounting system from a reputable manufacturer. Select a system design
that works for your loudspeaker and its intended use.

• Before using a custom-designed mounting system, have a licensed professional
engineer review the design and fabrication for structural integrity and safety in the
intended application.

• The threaded attachment points on the top, bottom, and sides of each loudspeaker
have an SAE

3

/

-16 inch thread with at least 18 usable threads.

8

• Lock washers or a locking compound intended for hand disassembly (such as
Loctite 242) should be used for a vibration resistant assembly.

• Use a safety cable, separately attached to the cabinet, at a point not in common with
the load-bearing attachment points of the mounting system to the loudspeaker. This
is recommended even if not required by local regulation. If you are unfamiliar with the
proper design, use, and purpose of a safety cable, consult a licensed professional
engineer or a rigging professional.

• Additional loudspeakers may be suspended below the Panaray LT loudspeaker
provided that:

• It employs all 8 threaded-insert hang points on the top and bottom to
fly and suspend the loudspeakers.

• The total weight of suspended loudspeakers and the Panaray LT
loudspeaker does not exceed the working load limit (WLL) listed
below:

LT 3202

®

-III Loudspeaker = 395 lb (179 kg)

LT 4402

®

-III Loudspeaker = 299 lb (135 kg)

®

or non-Bose mounting

LT 9402

TM

-III Loudspeaker = 261 lb (118 kg)

LT 9702

®

-III Loudspeaker = 381 lb (173 kg)

LT MB24-III Loudspeaker = 520 lb (236 kg)

CAUTION:

minimum. Unmarked machine fasteners should not be used for mounting system assembly, as there is no way to
determine their physical properties. Do not use an M10 fastener; although it is very similar to an SAE
they are not interchangeable. M10 washers may be used in place of

CAUTION:

Use only graded hardware. Fasteners should be SAE Grade 5 or ASTM designation A354, Grade BC

3

/

-16,

3

/

-inch washers.

8

8

The fasteners should be tightened using torque not to exceed 50 pounds.inch (5.6 Newton-meters).

Over-tightening the fastener could result in irreparable damage to the cabinet and create an unsafe assembly.

CAUTION:

The fastener should be long enough to engage no fewer than 16 threads of the attachment point . Using a
fastener that is too short provides inadequate holding power and may strip the mounting threads, resulting in an unsafe
assembly. Confirm that at least 16 full threads are engaged in your assembly.

CAUTION:

Do not attempt to alter the threaded attachment points. Do not attempt to re-thread the attachment points to
accommodate any other thread size or type; doing so will compromise the safety of the installation while permanently
damaging the loudspeaker.

5

How to Use This Reference Guide

The reference guide is divided into several sections. Below is a listing of each section and a brief description of what is
contained in each section:

Mechanical Specifications — This section gives mechanical drawings, dimensions, weights, center of gravity, insert

locations, and load ratings for each cabinet. This is intended to provide the information necessary for a qualified installer
to suspend or mount the loudspeakers.

Acoustic Specifications and Wiring Information — This section provides acoustic specifications for each loudspeaker.,

and details how to change the configuration of the loudspeakers from passive to bi-amp or bi-amped dual mid-range
mode (3202
provided.

Active Equalization — Each Panaray

information for providing active equalization.

Service Information — This section provides ordering information for replacement transducers and diaphragm kits.

Instructions on replacing the transducers and replacing the diaphragm are given. Exploded view assembly drawings are
given for each loudspeaker. Information on painting the cabinets is provided.

®

III speaker only). There are schematic diagrams of each loudspeaker and recommended amplifier power is

®

LT Series loudspeaker must have active equalization. This section contains

6

Mechanical Specifications

LT 3202

®

-III Loudspeaker

Materials and Construction:

The Panaray

®

LT 3202-III speaker is a mid/high-frequency loud­speaker designed for extremely long throw distances. The LT
3202-III speaker has the narrowest beamwidth characteristics of
all the LT cabinets (30˚ H x 20˚ V).

The LT 3202-III speaker is built with 10-ply marine-grade Baltic
birch wood. Sixteen threaded stainless steel hang points (4 top, 4
bottom, and 4 each side) allow for easy rigging with industry-stan­dard hardware. It has been manufactured with a textured black fin­ish and includes a contoured stainless steel grille. Both cabinet
and grille can be painted to match the surroundings.

Dimensions:

35.9''D x 22.5''W x 42.2''H
(913 mm x 573 mm x 1072 mm)

Weight:

Unpacked: 194 lb (88 kg)
Packaged: 241 lb (109 kg)

Load Limits:

The LT 3202-III loudspeaker has a working load limit (WLL) of 395 lb (179 kg)

.

Hardware:

• Use only graded hardware.

• Fasteners should be SAE Grade 5 or ASTM designation A354, Grade BC minimum.

• Unmarked machine fasteners should not be used for mounting system assembly, as there is no way to
determine their physical properties.

• Do not use an M10 fastener; although it is very similar to an SAE
washers may be used in place of

3

/

-inch washers.

8

3

/

-16, they are not interchangeable. M10

8

Safety and Regulatory Compliance:

This loudspeaker complies with ANSI/EIA-636 “Recommended Loudspeaker Safety Practices” and with EU EMC
Directives 89/336/EEC for CE marking.

7

Mechanical Specifications

®

LT 4402

-III Loudspeaker

Materials and Construction:

The Panaray

®

LT 4402-III speaker is a mid/high-frequency loud­speaker designed for medium-to-long throw distances. The LT
4402-III speaker features a tightly controlled 40 ˚ H x 40 ˚ V beam­width.

The LT 4402-III speaker is built with 10-ply marine-grade Baltic
birch wood. Sixteen threaded stainless steel hang points (4 top, 4
bottom, and 4 each side) allow for easy rigging with industry-stan­dard hardware. It has been manufactured with a textured black
finish and includes a contoured stainless steel grille. Both cabinet
and grille can be painted to match the surroundings.

Dimensions:

24’’H x 18.5’’W x 34’’W
(610 mm x 471 mm x 884 mm)

Weight:

Unpacked : 111 lb (50 kg)
Packaged : 142 lb (64 kg)

Load Limits:

The LT 4402-III loudspeaker has a working load limit (WLL) of 299 lb (135 kg)

.

Hardware:

• Use only graded hardware.

• Fasteners should be SAE Grade 5 or ASTM designation A354, Grade BC minimum.

• Unmarked machine fasteners should not be used for mounting system assembly, as there is no way to
determine their physical properties.

• Do not use an M10 fastener; although it is very similar to an SAE
may be used in place of

3

/

-inch washers.

8

3

/

-16, they are not interchangeable. M10 washers

8

Safety and Regulatory Compliance:

This loudspeaker complies with ANSI/EIA-636 “Recommended Loudspeaker Safety Practices” and with EU EMC Directives
89/336/EEC for CE marking.

8

LT 9402™-III Loudspeaker

Mechanical Specifications

Materials and Construction:

The Panaray

®

LT 9402-III speaker is a mid/high-frequency loud­speaker designed for medium-to-long throw distances. The LT
9402-III speaker features a tightly controlled 90˚H x 40˚V beam­width.

The LT 9402-III speaker is built with 10-ply marine-grade Baltic
birch wood. Sixteen threaded stainless steel hang points (4 top,
4 bottom, and 4 each side) allow for easy rigging with industry­standard hardware. It has been manufactured with a textured
black finish and includes a contoured stainless steel grille. Both
cabinet and grille can be painted to match the surroundings.

Dimensions:

23.7’’D x 22.5’’W x 34.6’’H
(604 mm x 572 mm x 879 mm)

Weight:

Unpacked : 113 lb (51 kg)
Packaged : 146 lb (66 kg)

Load Limits:

The LT 9402-III loudspeaker has a working load limit (WLL) of 261 lb (118 kg).

Hardware:

• Use only graded hardware.

• Fasteners should be SAE Grade 5 or ASTM designation A354, Grade BC minimum.

• Unmarked machine fasteners should not be used for mounting system assembly, as there is no way to
determine their physical properties.

• Do not use an M10 fastener; although it is very similar to an SAE
washers may be used in place of

3

/8-inch washers.

3

/

-16, they are not interchangeable. M10

8

Safety and Regulatory Compliance:

This loudspeaker complies with ANSI/EIA-636 “Recommended Loudspeaker Safety Practices” and with EU EMC
Directives 89/336/EEC for CE marking.

9

Mechanical Specifications

LT 9702®-III Loudspeaker

Materials and Construction:

The Panaray® LT 9702-III speaker is a mid/high-frequency
loudspeaker designed for shorter throw distances. The LT
9702-III speaker offers a 90˚H x 70˚V pattern which is the
broadest beamwidth of all the LT loudspeakers.

The LT 9702-III speaker is built with 10-ply marine-grade Baltic
birch wood. Sixteen threaded stainless steel hang points (4
top, 4 bottom, and 4 on each side) allow for easy rigging with
industry-standard hardware. It has been manufactured with a
textured black finish and contoured stainless steel grille. Both
cabinet and grille can be painted to match the surroundings.

Dimensions:

14.5’’D x 22.5’’W x 34.6’’H
(368 mm x 572 mm x 879 mm)

Weight:

Unpacked: 96 lb (43 kg)
Packaged: 124 lb (56 kg)

Load Limits:

The LT 9702-III loudspeaker has a working load limit (WLL) of 381 lb (173 kg).

Hardware:

• Use only graded hardware.

• Fasteners should be SAE Grade 5 or ASTM designation A354, Grade BC minimum.

• Unmarked machine fasteners should not be used for mounting system assembly, as there is no way to
determine their physical properties.

• Do not use an M10 fastener; although it is very similar to an SAE 3/8-16, they are not interchangeable. M10 washers
may be used in place of 3/8-inch washers.

Safety and Regulatory Compliance:

This loudspeaker complies with ANSI/EIA-636 “Recommended Loudspeaker Safety Practices” and with EU EMC Directives
89/336/EEC for CE marking.

10

LT MB24-III

Materials and Construction:

The Panaray® LT MB24-III speaker is a compact, low-frequency
loudspeaker designed exclusively for use with the Panaray LT
mid/high loudspeaker family.

The LT MB24-III speaker is built with 10-ply marine-grade Baltic
birch wood. Sixteen threaded stainless steel hang points (4 top,
4 bottom and 4 each side) allow for easy rigging with industry­standard components. It has been manufactured with a black
textured finish and a contoured stainless steel grille. Both the
cabinet and the grille can be painted to match the surroundings.

Modular Bass Loudspeaker

Mechanical Specifications

Dimensions:

25.5’’D x 20’’W x 28.1’’H
646 mm x 508 mm x 712 mm)

Weight:

Unpacked: 130 lb (59.19 kg)
Packaged: 147 lb (66.9 kg)

Load Limits:

The LT MB24 modular bass loudspeaker has a working load limit (WLL) of 520 lb (236 kg).

Hardware:

• Use only graded hardware.

• Fasteners should be SAE Grade 5 or ASTM designation A354, Grade BC minimum.

• Unmarked machine fasteners should not be used for mounting system assembly, as there is no way to
determine their physical properties.

• Do not use an M10 fastener; although it is very similar to an SAE 3/8-16, they are not interchangeable.
M10 washers may be used in place of 3/8-inch washers.

Safety and Regulatory Compliance:

This loudspeaker complies with ANSI/EIA-636 “Recommended Loudspeaker Safety Practices” and with EU
EMC Directives 89/336/EEC for CE marking.

11

Acoustical Specifications and Wiring

Recommended Wire Gauges

The loudspeakers should be connected to the amplifier outputs with heavy-gauge wire. To minimize power loss, larger
diameter wire should be used for longer lengths. The following chart can be used as a guide.

Length of Wire Wire Gauge

25 feet 16

40 feet 14

60 feet 12

100 feet 10

150 feet 8

Note: All wiring shall conform to applicable local and/or national electrical codes.

Verify that the polarity of the amplifier outputs are connected properly to the loudspeaker.

Internal Configurations

All Panaray® loudspeakers ship with a selectable internal crossover.

Each speaker ships in the passive position, but you can change the configuration from passive to bi-amped or bi-amped
dual mid-range (LT 3202®-III only).

• In passive mode — the internal passive crossover network is utilized, and a single amplified signal is connected to the
loudspeaker. This requires only one set of input connections and one amplifier channel.

• In bi-amplified mode — the mid-frequency and high-frequency drivers are accessed through separate pins on the NL8
connector. Two sets of connections and two amplifier channels are required. Bi-amplified mode allows additional control
of the balance between the mid-frequency and high-frequency levels.

• In bi-amplified dual mid-range mode — the mid-frequency and high-frequency drivers are accessed through separate
pins on the NL8 connectors. Three sets of connections and three amplifier channels are required. Bi-amplified dual mid­range allows independent control of two sets of V2 mid-frequency drivers as well as control of the high-frequency driver.

Note: There are no passive components in line when bi-amp or bi-amp dual mid-range configurations are selected.

All Panaray LT loudspeakers require active equalization. Do not operate the loudspeakers without the proper active
equalization for the particular loudspeaker and operating configuration. Failure to do so may result in permanent damage
to the loudspeaker.

See the Active Equalization section for more details.

12

To configure your LT 9702

1. Turn off amplifier power and disconnect the loudspeaker input connection.
Remove the rear connector plate.

2. Remove connector from the passive position.

Acoustical Specifications and Wiring

®

-III, LT 9402™-III, or LT 4402®-III loudspeaker:

3. Insert in the bi-amped position.

13

Acoustical Specifications and Wiring

®

To reconfigure your LT 3202

1. Turn off amplifier power and disconnect the loudspeaker input connection.
Remove the rear panel.

2. Pull out the connector from the passive position.

-III loudspeaker (only):

3. Insert in the bi-amped position.

4. Or insert in the bi-amped dual mid-range position.

14

Acoustical Specifications and Wiring

To reconfigure your LT MB24-III modular bass loudspeaker:

1. Turn off amplifier power and disconnect the loudspeaker input connection.
Remove the rear panel.

2. Pull out the connector from the passive

3. Insert in the bi-amped position.

position.

15

Acoustical Specifications and Wiring

g

q

LPF: Butt

4th

LT 3202

LT 3202-III speaker with grille

®

-III Loudspeaker Product Description

The Bose® Panaray® LT 3202®-III loudspeaker is a mid/high-frequency loudspeaker designed
for long throw distances. The LT 3202-III loudspeaker has the narrowest coverage character­istics of all the LT cabinets.

When arrayed correctly, LT 3202-III loudspeakers behave sonically as a large single source of
sound energy. This coherent wavefront provides full fidelity and even-coverage, at critical
mid- and high-frequencies throughout the coverage area of the array.

Each Panaray LT 3202-III loudspeaker uses four V2 mid-frequency drivers and a 1.4" com­pression driver mounted on a 30˚H x 20˚V constant directivity waveguide.

The LT 3202-III loudspeaker can be operated in passive, bi-amplified, or bi-amplified dual
mid-range modes.

• In passive mode, the internal crossover network is utilized, and a single amplified signal is
connected to the loudspeaker.

• In bi-amplified mode, the mid-frequency and high-frequency drivers are accessed through
separate pins on the Neutrik NL8 connectors.

• Bi-amplified dual mid-range mode allows independent control of two pairs of V2 mid-fre­quency drivers as well as control of the high-frequency driver. The mid-frequency and high­frequency drivers are accessed through separate pins on the Neutrik NL8 connectors.

Active equalization of the LT 3202-III loudspeaker can be provided by using the Panaray
LT 3202-III EQ card or the Panaray speaker and combination of speakers. A parametric
equalizer can replicate the active equalization curve on the following page, along with a high­pass filter and low pass filter as shown.

LLT 3202-III speaker without grille

3LT 3202-III speaker rear

LT 3202-III Acoustical Specifications

h Frequency:

erworth,

Bi-amped Dual Mid-range

order

Passive

Power Handling

Impedance 16 Ω 16 Ω 8 Ω 8 Ω 8 Ω 8 Ω

Sensitivity

Maximum SPL
(pink noise @1m @ rated power)

Recommended Crossover

Frequency Range

Beamwidth
(-6dB point, average 800 - 5 kHz)

1

2

(at 1W @ 1m) 110 dB SPL 107 dB SPL 111 dB SPL 104 dB SPL 104 dB SPL 111 dB SPL

3

4

(± 3 dB)

280W 280W 75W 140W 140W 75W

135 dB SPL 132 dB SPL 130 dB SPL 129 dB SPL 129 dB SPL 130 dB SPL

Internal Crossover

@ 1.6 kHz

Mid Fre

HPF: 160 Hz, Butterworth, 4th order
LPF: 1600 Hz, Butterworth, 4th order

Bi-Amped

Mid High Mid 1 Mid 2 High

uency:

Horizontal: 36°, Vertical: 22°

Hi

HPF: Butterworth, 4th order

200 Hz - 16 kHz

How our loudspeakers are measured

1. Power Handling

Full bandwidth pink noise, meeting the IEC Standard #268-5, is applied to the loudspeaker and amplified to a level at the loudspeaker
terminals corresponding to the power handling of the loudspeaker. The loudspeaker must show no visible damage or measurable loss
of performance after 100 hours of continuous testing.

2. Sensitivity

Full bandwidth pink noise is applied to the loudspeaker with its active equalization curve and amplified to a level at the loudspeaker
terminals corresponding to 1 watt as referenced to the nominal impedance. The average sound pressure level (dB-SPL) is measured
at 1 meter from the speaker in an anechoic environment.

3. Maximum SPL

Full bandwidth pink noise is applied to the loudspeaker with its active equalization curve and amplified to a level at the loudspeaker
terminals corresponding to the long-term rated power handling of the speaker. The average sound pressure level (dB-SPL) is mea­sured at 1 meter from the speaker in an anechoic environment.

4. Frequency Range

Sine waves are injected into the loudspeaker and the level is adjusted to 1 watt, as referenced to the nominal impedance, and the
level measured at 1meter. Resulting graph is smoothed by 0.05 octave-band.

16

LT 3202®-III Loudspeaker Configurations

Acoustical Specifications and Wiring

Passive

Bi-amped

LT 3202-III Loudspeaker Active Equalization Curves

Bi-amped Dual Mid-Range

17

Acoustical Specifications and Wiring

,

g

y

,

,

®

LT 4402

LT 4402-III speaker with grille

-III Loudspeaker Product Description

The Bose® Panaray® LT 4402®-III loudspeaker is a mid/high-frequency device designed for
medium to long throw distances. The LT 4402-III loudspeaker offers a 44˚ horizontal by 38˚
vertical dispersion pattern which is ideal for highly reverberant spaces.

When arrayed correctly, LT 4402-III loudspeakers behave sonically as a large, single source
of sound energy. This coherent wavefront provides full fidelity and even-coverage at critical
mid- and high-frequencies throughout the coverage area of the array.

Each Panaray LT 4402-III loudspeaker uses two V2 mid-frequency drivers and a 1.4" com­pression driver mounted on a 40˚H x 40˚V constant directivity waveguide.

The LT 4402-III loudspeaker can be operated in passive or bi-amplified modes.

• In passive mode, the internal passive crossover network is utilized, and a single amplified
signal is connected to the loudspeaker.

• In bi-amplified mode, the mid-frequency and high-frequency drivers are accessed through
separate pins on the Neutrik NL4 connectors.

Active equalization of the LT 4402-III loudspeaker can be provided by using the Panaray LT
4402-III EQ card or the Panaray System controller with presets for each Panaray speaker and
combination of speakers. A parametric equalizer can replicate the active equalization curve on
the following page, along with a high-pass filter and low pass filter as shown.

LT 4402-III speaker without grille

LT 4402-III Acoustical Specifications

Power Handling

Impedance

Sensitivity

Maximum SPL
(pink noise @1m @ rated power)

Recommended Crossover

Frequency Range

Beamwidth
(-6dB point, average 800 - 5 kHz)

1

2

(at 1W @ 1m)

3

4

(± 3 dB)

Passive

140W

8 Ω

108 dB SPL

130 dB SPL

Internal Crossover @ 1.6 kHz

Mid Frequency

HPF: 160 Hz
LPF: 1600 Hz

Hi

h Frequenc

HPF: 1600 Hz, Butterworth, 4th order
LPF: 20 kHz

Horizontal: 44°, Vertical: 38°

Mid High

140W

8 Ω

106 dB SPL

128 dB SPL

Butterworth, 4th order

Butterworth, 4th order

Butterworth, 4th order

180 Hz - 16 kHz

How our loudspeakers are measured

1. Power Handling

Full bandwidth pink noise, meeting the IEC Standard #268-5, is applied to the loudspeaker and amplified to a level at the loudspeaker
terminals corresponding to the power handling of the loudspeaker. The loudspeaker must show no visible damage or measurable loss
of performance after 100 hours of continuous testing.

2. Sensitivity

Full bandwidth pink noise is applied to the loudspeaker with its active equalization curve and amplified to a level at the loudspeaker
terminals corresponding to 1 watt as referenced to the nominal impedance. The average sound pressure level (dB-SPL) is measured
at 1 meter from the speaker in an anechoic environment.

3. Maximum SPL

Full bandwidth pink noise is applied to the loudspeaker with its active equalization curve and amplified to a level at the loudspeaker
terminals corresponding to the long-term rated power handling of the speaker. The average sound pressure level (dB-SPL) is mea­sured at 1 meter from the speaker in an anechoic environment.

4. Frequency Range

Sine waves are injected into the loudspeaker and the level is adjusted to 1 watt, as referenced to the nominal impedance, and the
level measured at 1meter. Resulting graph is smoothed by 0.05 octave-band.

Bi-Amped

75W

8 Ω

107 dB SPL

126 dB SPL

LT 4402-III speaker rear

18

LT 4402®-III Loudspeaker Configurations

Acoustical Specifications and Wiring

Passive

Bi-amped

LT 4402-III Loudspeaker Active Equalization Curves

19

Acoustical Specifications and Wiring

q

y

g

y

LT 9402™-III Loudspeaker Product Description

The Bose® Panaray® LT 9402™-III loudspeaker is a mid/high-frequency device designed for
medium throw distances. The LT 9402-III loudspeaker offers an 95˚ horizontal by 39˚ vertical
dispersion pattern that allows you to cover a large seating area and direct energy away from
reflective surfaces such as ceilings.

When arrayed correctly, LT 9402-III loudspeakers behave sonically as a large single source of
sound energy. This Coherent Wavefront provides full fidelity and even-coverage at critical
mid- and high-frequencies throughout the coverage area of the array.

Each PANARAY LT 9402-III loudspeaker uses two V2 mid-frequency drivers and a 1.4" com­pression driver mounted on a 90˚H x 40˚V constant directivity waveguide.

The LT 9402-III loudspeaker can be operated in passive or bi-amplified modes.

• In passive mode, the internal passive crossover network is utilized and a single amplified
signal is connected to the loudspeaker.

LT9402-III speaker with grille

• In bi-amplified mode, the mid-frequency and high-frequency drivers are accessed through
separate pins on the Neutrik NL4 connectors.

Active equalization for the LT 9402 III loudspeaker an be provided by using the Panaray
LT 9402-III EQ card or the Panaray System controller with presets for each Panaray speaker
and combination of speakers. A parametric equalizer can replicate the active equalization
curve on the following page, along with a high-pass filter and low pass filter as shown.

LT9402-III speaker without grille

LT9402-III speaker rear

LT 9402-III Acoustical Specifications

Passive Bi-Amped

Power Handling

Impedance

Sensitivity

Maximum SPL
(pink noise @1m @ rated power)

Recommended Crossover

Frequency Range

Beamwidth
(-6dB point, average 800 - 5 kHz)

1

2

(at 1W @ 1m)

3

4

(± 3 dB)

140W 140W 75W

8 Ω 8 Ω 8 Ω

106 dB SPL 106 dB SPL 106 dB SPL

128 dB SPL 128 dB SPL 125 dB SPL

Mid Fre

HPF: 160 Hz, Butterworth, 4th order

Internal Crossover @ 1.6 kHz

LPF: 1600 Hz, Butterworth, 4th order

Hi

h Frequenc

HPF: 1600 Hz, Butterworth, 4th order
LPF: 20 kHz, Butterworth, 4th order

Horizontal: 95°, Vertical: 39°

How our loudspeakers are measured

1. Power Handling

Full bandwidth pink noise, meeting the IEC Standard #268-5, is applied to the loudspeaker and amplified to a level at the loudspeaker
terminals corresponding to the power handling of the loudspeaker. The loudspeaker must show no visible damage or measurable loss
of performance after 100 hours of continuous testing.

2. Sensitivity

Full bandwidth pink noise is applied to the loudspeaker with its active equalization curve and amplified to a level at the loudspeaker
terminals corresponding to 1 watt as referenced to the nominal impedance. The average sound pressure level (dB-SPL) is measured
at 1 meter from the speaker in an anechoic environment.

3. Maximum SPL

Full bandwidth pink noise is applied to the loudspeaker with its active equalization curve and amplified to a level at the loudspeaker
terminals corresponding to the long-term rated power handling of the speaker. The average sound pressure level (dB-SPL) is mea­sured at 1 meter from the speaker in an anechoic environment.

4. Frequency Range

Sine waves are injected into the loudspeaker and the level is adjusted to 1 watt, as referenced to the nominal impedance, and the
level measured at 1meter. Resulting graph is smoothed by 0.05 octave-band.

Mid High

uenc

180 Hz - 16 kHz

20

LT 9402™-III Loudspeaker Configurations

Acoustical Specifications and Wiring

Passive

Bi-amped

LT 9402-III Loudspeaker Active Equalization Curves

21

Acoustical Specifications and Wiring

,

,

g

y

®

LT 9702

LT 9702-III speaker with grille

-III Loudspeaker Product Description

The Bose® Panaray® LT 9702®-III loudspeaker is a mid/high-frequency device designed for
shorter throw distances. The LT 9702-III loudspeaker offers an 92º horizontal by 61º vertical
dispersion pattern which is the broadest beamwidth of all the LT loudspeakers.

When arrayed correctly, LT 9702-III loudspeakers behave sonically as a large single source
of sound energy. This Coherent Wavefront provides full fidelity and even coverage at critical
mid- and high-frequencies throughout the coverage area of the array.

Each Panaray LT 9702-III loudspeaker uses two V2 mid-frequency drivers combined with a

1.4" compression driver mounted on a 90˚H x 70˚V constant directivity waveguide.

The LT 9702-III loudspeaker can be operated in a passive or bi-amplified mode.

• In passive mode, the internal passive crossover network is utilized and a single amplified
signal is connected to the loudspeaker.

• In bi-amplified mode, the mid-frequency and high-frequency drivers are accessed through
separate pins on the Neutrik NL4 connectors.

Active equalization for the LT 9702 III loudspeaker can be provided by using the Panaray
LT 9702-III EQ card or the Panaray system digital controller with presets for each Panaray
speaker and combination of speakers. A parametric equalizer can replicate the active
equalization curve on the following page, along with a high-pass filter and low pass filter as
shown.

LT 9702-III speaker without grille

LT 9702-III speaker rear

LT 9702-III Acoustical Specifications

Passive Bi-Amped

Power Handling

Impedance

Sensitivity

Maximum SPL
(pink noise @1m @ rated power)

Recommended Crossover

Frequency Range

Beamwidth
(-6dB point, average 800 - 5 kHz)

1

2

(at 1W @ 1m)

3

4

(± 3 dB)

140W 140W

8 Ω 8 Ω 8 Ω

104 dB SPL 105 dB SPL 104 dB SPL

126 dB SPL 127 dB SPL 123 dB SPL

Mid Frequency

HPF: 160 Hz

Internal Crossover @ 1.6 kHz

LPF: 1600 Hz

h Frequenc

Hi

HPF: 1600 Hz, Butterworth, 4th order
LPF: 20 kHz, Butterworth, 4th order

Horizontal: 92°, Vertical: 61°

How our loudspeakers are measured

1. Power Handling

Full bandwidth pink noise, meeting the IEC Standard #268-5, is applied to the loudspeaker and amplified to a level at the loud­speaker terminals corresponding to the power handling of the loudspeaker. The loudspeaker must show no visible damage or mea­surable loss of performance after 100 hours of continuous testing.

2. Sensitivity

Full bandwidth pink noise is applied to the loudspeaker with its active equalization curve and amplified to a level at the loudspeaker
terminals corresponding to 1 watt as referenced to the nominal impedance. The average sound pressure level (dB-SPL) is measured
at 1 meter from the speaker in an anechoic environment.

3. Maximum SPL

Full bandwidth pink noise is applied to the loudspeaker with its active equalization curve and amplified to a level at the loudspeaker
terminals corresponding to the long-term rated power handling of the speaker. The average sound pressure level (dB-SPL) is mea­sured at 1 meter from the speaker in an anechoic environment.

4. Frequency Range

Sine waves are injected into the loudspeaker and the level is adjusted to 1 watt, as referenced to the nominal impedance, and the
level measured at 1meter. Resulting graph is smoothed by 0.05 octave-band.

Mid High

75W

Butterworth, 4th order

Butterworth, 4th order

180 Hz - 16 kHz

22

LT 9702®-III Loudspeaker Configurations

Acoustical Specifications and Wiring

Passive

Bi-amped

LT 9702-III Loudspeaker Active Equalization Curves

23

Acoustical Specifications and Wiring

LT MB24 Loudspeaker Product Description

The Panaray® LT MB24-III modular bass loudspeaker is a compact low-frequency loud­speaker designed exclusively for use with the Panaray LT mid/high-frequency loudspeaker
family.

The LT MB24-III integrates two 12" woofers in a proprietary acoustic enclosure. This
enables the LT MB24-III to deliver high SPL and wide bandwidth without audible port noise
The size of the LT MB24-III has also been optimized so that it can be used in multiple bass
array configurations.

The LT MB24-III is fully compatible – acoustically and aesthetically – with LT mid/high­frequency loudspeakers. The LT MB24-III loudspeaker is the ideal bass extension solution for
any of the LT mid/high-frequency loudspeakers.

LT MB24-III with grille

Each Panaray LT MB24-III bass loudspeaker uses two 12" low-frequency drivers built into a
proprietary acoustic enclosure.

The LT MB24-III can be operated in parallel or discrete modes.

• In parallel mode, a single amplified signal is connected to the loudspeaker.

• In discrete mode, each loudspeaker can be independently driven by a separate amplifier.
Individual drivers are accessed through separate pins on the Neutrik NL4 connectors.

Active Equalization for the LT MB24-III loudspeaker can be provided by using the Panaray
LT MB24-III EQ card or the Panaray System Digital Controller with presets for each Panaray
speaker and combination of speakers. A parametric equalizer can replicate the active
equalization curve on the following page, along with a high-pass filter and low pass filter as
shown.

LT MB24-III without grille

LT MB24-III rear

LT MB24-III Acoustical Specifications

Parallel Discrete

Power Handling

Impedance

Sensitivity

Maximum SPL
(pink noise @1m @ rated power)

Recommended Crossover

Frequency Range

1

2

(at 1W @ 1m)

3

4

(± 3 dB)

800W 400W 400W

4 Ω 8 Ω 8 Ω

94 dB SPL

123 dB SPL 117 dB SPL 117 dB SPL

HPF: 40Hz, Butterworth, 4th order

LPF: 250Hz, Butterworth, 4th order

How our loudspeakers are measured

1. Power Handling

Full bandwidth pink noise, meeting the IEC Standard #268-5, is applied to the loudspeaker and amplified to a level at the loudspeaker
terminals corresponding to the power handling of the loudspeaker. The loudspeaker must show no visible damage or measurable loss
of performance after 100 hours of continuous testing.

2. Sensitivity

Full bandwidth pink noise is applied to the loudspeaker with its active equalization curve and amplified to a level at the loudspeaker
terminals corresponding to 1 watt as referenced to the nominal impedance. The average sound pressure level (dB-SPL) is measured at
1 meter from the speaker in an anechoic environment.

3. Maximum SPL

Full bandwidth pink noise is applied to the loudspeaker with its active equalization curve and amplified to a level at the loudspeaker
terminals corresponding to the long-term rated power handling of the speaker. The average sound pressure level (dB-SPL) is mea­sured at 1 meter from the speaker in an anechoic environment.

4. Frequency Range

Sine waves are injected into the loudspeaker and the level is adjusted to 1 watt, as referenced to the nominal impedance, and the level
measured at 1meter. Resulting graph is smoothed by 0.05 octave-band.

Driver 1 Driver 2

91 dB SPL 91 dB SPL

40 Hz - 250 Hz

24

Acoustical Specifications and Wiring

LT MB24-III Loudspeaker Configurations

Parallel

LT MB24-III Loudspeaker Active Equalization Curve

Discrete

25

Active Equalization

WARNING: All Panaray

¤

LT Series III loudspeakers require active equalization. Do not operate the loudspeakers
without the proper active equalization for the particular loudspeaker and operating configuration. Failure to do
so may result in permanent damage to the loudspeaker.

EQ Card Product CodesPC

LT 3202®-II/III Passive EQ Card 011502

LT 4402®-II/III Passive EQ Card 011504

LT 9702®-II/III Passive EQ Card 017929

LT 9402TM-III Passive EQ Card 035325

LT Series II MF EQ Card 018485

LT MB24-III/MB4 EQ Card 027058

Active equalization with the Bose

When using the Bose 1600-VI or 1800-VI amplifier to power Panaray LT Series III loudspeakers, optional active equaliza­tion cards are available from Bose. These cards install inside the rear of the 1600-VI or 1800-VI amplifier. The equalized
signal from one 1800-VI amplifier can be daisy-chained to other amplifiers that use the same audio signal as the first loud­speaker (same equalization, in the same configuration, with the same time delay, etc.). Usually only one EQ card is
required for each loudspeaker type in a cluster.

®

1600-VI or 1800-VI amplifier

Other methods of providing active equalization

If you are using a non-Bose amplifier, the Panaray system digital controller can provide active equalization for the LT
Series III loudspeakers. A parametric equalizer can also replicate the active equalization curve below along with a high­pass filter and low-pass filter. The active equalization curves are located in the Acoustical Specifications and Wiring sec­tion.

LT Series III Mid/High Loudspeakers

When using the loudspeakers in the passive mode, there is a different EQ card required for each of the four loudspeakers.
These equalization curves are designed for a single loudspeaker.

When several loudspeakers are used together in a cluster, coupling in the low mid-frequency often occurs which boosts
these frequencies. There is a jumper on the EQ cards that compensates for this coupling phenomenon. Cutting jumper
C20 decreases the low mid-frequency equalization (by 4dB at 200Hz).

In bi-amplified mode, one mid-frequency EQ card is available for use with any of the three Panaray LT Series III loud­speakers. This EQ card is used to provide an equalized signal for the mid-frequency (V2) driver only.

In bi-amplified dual mid range mode (LT 3202-III only), the mid frequency EQ card should be used for each pair of V2 driv­ers.

LT MB24 Modular Bass Loudspeaker:

The LT MB24 requires the same active equalization for both parallel and discrete modes.

26

Service Information

This section contains information on servicing Panaray

®

LT cabinets.

•Ordering information for replacement parts

• Painting information

• Replacement instructions for transducers or diaphragms

• Drawings of each cabinet type

Note: Service should only be performed by a qualified audio professional.

Panaray LT Replacement Parts

To order replacement parts, call the Bose
left hand column above

Replacement part Product Part number

3202-III Grille (includes screws) 3202®-III 276843

4402-III Grille (includes screws) 4402®-III 276844

9402-III Grille (includes screws) 9402™-III 276845

9702-III Grille (includes screws) 9702®-III 276846

Replacement Screws for grille All 276847

Replacement Logo All 276848

®

Customer Service center nearest you. Request parts by the part number in the

Input panel w/crossover board 3202 3202-III 276851

Input panel w/crossover board 4402 4402-III 276852

Input panel w/crossover board 9402 9402-III 276853

Input panel w/crossover board 9702 9702-III 276854

Compression driver All 276860

Diaphragm for compression driver All 276861

Compression driver plate w/screws All 276849

V2 assembly with drivers All 276850

Grille w/screws, tape, logo, tape, fastener and

MB24-III 278244

spring

Screws for grille MB24-III 276847

Logo with tape, fastener and spring MB24-III 276848

Input panel w/molex connector MB24-III 278245

Woofer MB24-III 278248

27

Service Information

Painting Information

The Panaray® LT 3202®-III, 4402®-III, 9402™-III, 9702®-III and MB24-III loudspeaker cabinets can be painted. When painting
an LT loudspeaker, it is important that no paint is applied to the transducers or connector panel.

Before painting the cabinet, turn off the amplifier power and disconnect the loudspeaker input connection. Make sure the
cabinet is clean and free of dust and debris. The transducers and connector panel must be removed or masked so that no
paint can get on them. For maximum paint adhesion, an alkyd enamel (oil based) primer should be used. Follow the
instructions of the primer manufacturer in applying the primer. When the primer is sufficiently dry, latex paint can be
applied to the cabinet. Several layers of paint may be needed, depending on the color of the paint and the cosmetic stan­dards desired. Paint can be applied in any standard method including brush, roller, spray, etc. The method of applying
paint should be determined by the cosmetic standards desired. For best results, a professional spray paint process
should be used.

The above paragraph contains the recommended painting method for maximum paint adhesion and cosmetic standards.
If an alkyd enamel primer cannot be used, a latex primer can be used but this will not provide as much adhesion as the
alkyd enamel primer. Latex paint can also be used directly on the cabinet without any primer but this will also result in less
adhesion.

28

Service Information

®

To Replace the t1.4hp High-frequency Compression Driver in the Panaray
LT 3202

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.

1. Turn off the amplifier power.

2. Disconnect the loudspeaker input connection.

3. Remove the 12 screws from the rear cover of the loudspeaker and slide the rear cover up and remove it from the cab-

inet.

4. Disconnect the blue wire from the positive (+) terminal and the black wire from the negative (-)terminal of the t1.4hp

driver.

Note: On some models, the connectors may be lightly soldered to the terminals on the compression driver so removing the

connectors may require a soldering iron.

5. Remove the four screws holding the compression driver assembly to the cabinet.

6. Remove the four countersunk screws that connect the mounting plate to the compression driver.

7. Connect the new compression driver to the mounting plate using the four countersunk screws.

8. Insert the compression driver assembly into the rear of the loudspeaker cabinet and secure with four screws.

9. Reconnect the blue wire to the positive (+) terminal and the black wire to the negative (-) terminal.

10. Replace the rear cover and secure it with the 12 screws.

11. Reconnect the loudspeaker input signal to the Speakon™ connectors.

12. Turn on the amplifier.

®

-III, LT 4402®-III, LT 9402TM-III or LT 9702®-III Loudspeakers

29

Service Information

To Replace the t1.4hp High-frequency Compression Driver Diaphragm

Replacement diaphragm for the t1.4hp high-frequency
compression driver

To remove the compression driver from the loudspeaker cabinet:

1. Select, a clean, well lit work area that is free of magnetic materials that might be attracted to the magnet in the com-

pression driver.

Note: Do not let any dirt or dust come in contact with the replacement diaphragm.

2. Carefully clean the outside of the compression driver with a damp cloth.

3. Place the rear of the driver facing up.

4. Remove the three 5.32" stainless steel hexhead screws and lock washers with a 5.32" hex wrench by

first loosening each screw one turn. Then alternate loosening each screw until they are removed from the rear cover.

5. Gently lift the rear cover straight up. Set it down on its outside to keep the inside clean.

6. Remove the black diaphragm assembly by gently lifting and rotating it.

7. Examine the gap in which the coil of the diaphragm sits by completing the following:

A. Gently insert one end of a piece of clean paper (approximately 1" x 1.2") into the gap.

B. Slowly work the paper into the gap.

C. Move the paper around the perimeter of the gap.

Note: You should not feel any debris or obstructions with the paper. If there is debris, use a piece of masking tape to

remove. Fold the tape so that both sides have the adhesive backing on the outside. Insert the tape into the gap and work it
into and around the gap, removing any debris.

D. When the gap is clean, check once again with a clean piece of paper.

Note: If the gap is still not clean, do not install the replacement diaphragm but instead, replace the entire compression

driver.

8. Once the gap is clean, make sure that there is no debris on the front plate.The front plate may have some small

smudges from fingerprints but there should be no debris (from a shattered aluminum diaphragm or any other source)
and it should feel smooth to the touch with no pits in the metal.

9. Remove the replacement diaphragm from its carton.

Note: Set it down so that the coil is facing up.

10. Grasp the diaphragm assembly around its edges and gently place it onto the front of the compression

driver assembly. Do not press down on the diaphragm assembly (as this could cause the coil on the underside of
the diaphragm assembly to be crushed against the front of the compression driver assembly).

30

Service Information

11. Slowly and gently rotate the diaphragm assembly so that the coil is worked into the gap in the front of the compres-

sion driver, is centered in the gap, and the diaphragm assembly rests smoothly against the front plate of the compres­sion driver. The screw holes in the diaphragm can be visually lined up with the screw holes in the front of the
compression driver assembly to help center the coil into the gap.

12. Align the holes in the diaphragm assembly with the holes in the front of the compression driver assembly.

13. Place the rear cover back on by aligning the three screw holes and the three post holes.

Note: Make sure the assembly fits together, is flush, and the holes align.

14. Place a screw with lock washer into each of the three holes.

15. Apply a sine-wave to the driver at a frequency of 300Hz and a maximum amplitude of 2 volts.The unit should produce

a tapping sound, not a buzzing sound. If you hear a buzzing sound, center the diaphragm coil in the gap until the
buzzing sound goes away.

16. Slowly tighten the three screws, alternating turns so there is even pressure on the back cover. If you hear a buzzing

sound as you tighten, back off the screws until the buzzing sound goes away. Resume tightening the screws, paying
attention to alternately tightening each screw the same number of turns. Tighten each screw to a maximum torque
setting of 25 inch-pounds.

17. Sweep the frequency of the sine-wave from 300Hz to 1kHz and listen for buzzing. If you hear buzzing, readjust the

diaphragm or clean the gap again. Dirt and/or misalignment of the diaphragm causes buzzing. Continue sweeping the
frequency until you do not hear any buzzing. The driver is ready to use.

31

Service Information

®

To Replace the V-2 Mid-frequency Driver in the Panaray

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.

1. Turn off the amplifier power.

2. Disconnect the loudspeaker input connection(s).

3. The LT 3202-III uses a total of four V2 drivers. Remove the four screws securing each V2 driver to the cabinet.

CAUTION: Be careful not to let the driver fall out of the cabinet.

4. Disconnect the following:

• For the top/first V2, disconnect the BLUE (+) and BLACK (-) wires connected to the driver.

• For the second V2, disconnect the RED (+) and BLUE (-) wires connected to the driver.

• For the third V2, disconnect the BLUE (+) and BLACK (-) wires.

• For the bottom/fourth V2, disconnect the RED (+) and BLUE (-) wires.

5. Replace the damaged V2 driver.

6. Make the following connections:

• For the top/first V2, connect the BLUE (+) and BLACK (-) wires connected to the driver.

• For the second V2, connect the RED (+) and BLUE (-) wires connected to the driver.

• For the third V2, connect the BLACK (+) and BLUE (-) wires.

• For the bottom/fourth V2, connect the RED (+) and BLUE (-) wires.

7. Secure each V2 driver to the cabinet with the four screws (on each V2).

8. Reconnect the input connections.

9. Turn on amplifier power.

LT 3202®-III

32

Service Information

®

To Replace the V-2 Mid-frequency Driver in the Panaray
LT 9402

1. Turn off the amplifier power.

2. Disconnect the loudspeaker input connection(s).

3. The LT 4402-III, LT 9402-III and LT 9702-III use two V2 drivers. Remove the four screws securing each V2 driver to the

cabinet.

CAUTION: Be careful not to let the driver fall out of the cabinet.

4. Disconnect the following:

• For the top V2, disconnect the RED (+) and BLUE (-) wires connected to the driver.

• For the bottom V2, disconnect the BLACK (+) and BLUE (-) wires.

5. Replace the damaged V2 driver.

6. Make the following connections:

• For the top V2, connect the RED (+) and BLUE (-) wires connected to the driver.

• For the bottom V2, connect the BLUE (+) and BLACK (-) wires.

7. Secure each V2 driver to the cabinet with the four screws (on each V2).

8. Reconnect the input connections.

9. Turn on amplifier power.

TM

-III or LT 9702® -III Loudspeakers

LT 4402®-III,

.

33

Service Information

To Replace the 12" Woofer in the Panaray LT MB24-III Modular Bass Loud­speaker

1. Turn off amplifier power

2. Disconnect the loudspeaker input connection(s)

3. Remove the 22 screws securing the grill to the enclosure. Lift the grill off of the enclosure.

4. Remove the 8 screws securing the driver to the enclosure.

5. Lift the driver out of the enclosure.

6. Remove the old gasket.

7. Disconnect the RED (+) and BLACK (-) wires connected to the driver.

8. Replace gasket.

9. Make the following connections to the new driver:

• Connect the RED (+) and BLACK (-) wires connected to the new driver.

10. Insert new driver to the cabinet and secure with the 8 screws.

11. Reconnect the input connections.

12. Turn on amplifier power.

34

Driver and Electronics Assembly

LT 3202®-III Loudspeaker

Service Information

1 Logo, Panaray LT 9 Disk, Align, Compression Driver 17 Washer

2 Kit, Grille Screw, TA 4x15

(14 screws per kit)

3 Cap, Spring 11 Screw, KM 6x12 19 V2 Assembly

4 Spring, Logo 12 Plate, Mount, Compression Driver 20 Gasket, Input Manifold

5 Clip, Retaining, Logo 13 Screw, TM 6x30 21 Manifold, V2

6 Grille Assembly, includes: screws,

tape, logo, fastener and spring

7 Gasket, Grille 15 Gasket, Rear Panel 23 Input Panel with Crossover PCB

8 Gasket, Compression Driver 1 16 Panel, Rear

10 Screw, KM 4x12 18 Screw TM 4x15

14 Compression Driver 22 Gasket, Output Manifold

35

Service Information

LT 4402®-III Loudspeaker

1 Grille Assembly, includes: screws,

tape, logo, fastener and spring

2 Gasket, Grille 10 Compression Driver 18 Gasket, Output Manifold

3 Kit, Grille Screw, TA 4x15

(14 screws per kit)

4 Gasket, Compression Driver 12 Panel, Rear 20 Standoffs for Crossover PCB

5 Disk, Alignment, Compression Driver 13 Screw TM 4x15 21 Input Panel with Crossover PCB

6 Screw, KM 4x12 14 V2 Assembly 22 Screw, KM 3x12

7 Screw, KM 6x12 15 Gasket, Upper Flange 23 Gasket, Input Panel

8 Plate, Mount, Compression Driver 16 Gasket, Input Manifold

9 Screw, TM 6x30 17 Manifold, V2

11 Gasket Panel 19 Panel, Input

36

LT 9402TM-III Loudspeaker

Service Information

1

1

891011 12 13 14 15 16

2

3

4

5

17

18

19

6

20

7

21222324

1 Kit, Grille Screw, TA 4x15

(14 screws per kit)

2 Logo, Panaray LT 10 Screw, KM 4x12 18 Manifold, V2

3 Grille Assembly, includes: screws,

tape, logo, fastener and spring

4 Cap, Spring 12 Plate, Mount, Compression Driver 20 V2 assembly

5 Spring, Logo 13 Screw, TM 6x30 21 Gasket, Output Manifold

6 Clip, Retaining, Logo 14 Compression Driver 22 Panel, Input with Crossover

7 Gasket, Grille 15 Gasket, Panel 23 Gasket, Input Panel

8 Gasket, Compression Driver 16 Panel, Rear 24 Screw, KM 3x12

9 Disk, Alignment, Compression Driver 17 Screw, TM 4x15

11 Screw, KM 6x12r 19 Gasket, Input Manifold

37

Service Information

LT 9702®-III Loudspeaker

1 Grille Assembly, includes: screws,

tape, logo, fastener and spring

2 Kit, Grille Screw, TA 4x15

(14 screws per kit)

3 Clip, Retaining, Logo 12 Plate, Mount, Compression Driver 21 Gasket, Output Manifold

4 Spring, Logo 13 Screw, TM 6x30 22 Panel, Input with Crossover

5 Cap, Spring 14 Compression Driver 23 Standoffs for Input Panel PCB

6 Logo, Panaray LT 15 Gasket, Panel 24 Input Panel, PCB

7 Gasket, Grille 16 Panel, Rear 25 Screw, KM 3x12

8 Gasket, Compression Driver 17 Screw, TM 4x15 26 Gasket, Input Panel

9 Disk, Alignment, Compression Driver 18 V2 Assembly

10 Screw, KM 4x12 19 Gasket, Input Manifold

11 Screw, KM 6x12 20 Manifold, V2

38

LT MB24-III Loudspeaker

Service Information

1 Gasket, Grille, MB24 Bass Module 5 Gasket, Input Panel

2 Grille Assembly, includes: screws,

logo, tape, fastener and spring

3 Grille Screw Kit (14 screws) 7 Woofer Assembly, 12-inch, TBX

4 Gasket, Woofer 8 Screw, Woofer

6 Input Panel Kit

39

©2004 Bose Corporation, the Mountain,
Framingham, MA 01701-9168 USA
269724 AM Rev.00 cmm-040235