Bose® Panaray® LT Series III Loudspeakers
Reference Guide
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Contents
Safety Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Mounting Guidelines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
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5
How to Use This Manual . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
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Mechanical Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
LT 3202®-III Loudspeaker . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
LT 4402®-III Loudspeaker . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
LT 9402™-III Loudspeaker . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
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7
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9
LT 9702®-III Loudspeaker . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
LT MB24-III Modular Bass Loudspeaker . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
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® LT Replacement Parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Painting Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
To Replace the t1.4hp High-frequency Compression Driver in the Panaray LT 3202-III,
LT 4402-III, LT 9404-III or LT 9702-III Loudspeakers . . . . . . . . . . . . . . . . . . . . . . . . . . 29
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,
LT 9402-III or LT 9702 -IIILoudspeakers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
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
3
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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: This system is capable of supplying extremely high sound pressure levels (SPL).
WARNING: 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
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Safety Information
Mounting Guidelines
WARNING: The Panaray® LT Series loudspeakers must be attached to brackets or other mounting surfaces for
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 LT loudspeaker installation requires the use of either Bose® or non-Bose mounting
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 3/8-16 inch thread with at least 18 usable threads.
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)
LT 9702®-III Loudspeaker = 381 lb (173 kg)
TM
LT 9402 -III Loudspeaker = 261 lb (118 kg)
LT MB24-III Loudspeaker = 520 lb (236 kg)
CAUTION: 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.
CAUTION: 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
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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 III speaker only). There are schematic diagrams of each loudspeaker and recommended amplifier power is
provided.
®
Active Equalization — Each Panaray LT Series loudspeaker must have active equalization. This section contains
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.
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Mechanical Specifications
LT 3202®-III Loudspeaker
Materials and Construction:
The Panaray® LT 3202-III speaker is a mid/high-frequency loud-
speaker 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-stan-
dard hardware. It has been manufactured with a textured black fin-
ish 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 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.
7
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Mechanical Specifications
LT 4402® -III Loudspeaker
Materials and Construction:
The Panaray® LT 4402-III speaker is a mid/high-frequency loud-
speaker designed for medium-to-long throw distances. The LT
4402-III speaker features a tightly controlled 40˚H x 40˚V beam-
width.
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-stan-
dard 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 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.
8
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Mechanical Specifications
LT 9402™-III Loudspeaker
Materials and Construction:
The Panaray® LT 9402-III speaker is a mid/high-frequency loud-
speaker designed for medium-to-long throw distances. The LT
9402-III speaker features a tightly controlled 90˚H x 40˚V beam-
width.
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 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:
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 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.
9
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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
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Mechanical Specifications
LT MB24-III Modular Bass Loudspeaker
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 industry-
standard 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.
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
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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
25 feet
Wire Gauge
16
14
12
10
8
40 feet
60 feet
100 feet
150 feet
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 mid-
range 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
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Acoustical Specifications and Wiring
To configure your LT 9702®-III, LT 9402™-III, or LT 4402®-III loudspeaker:
1. Turn off amplifier power and disconnect the loudspeaker input connection.
Remove the rear connector plate.
2. Remove connector from the passive position.
3. Insert in the bi-amped position.
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Acoustical Specifications and Wiring
To reconfigure your LT 3202®-III loudspeaker (only):
1. Turn off amplifier power and disconnect the loudspeaker input connection.
Remove the rear panel.
2. Pull out the connector from the passive position.
3. Insert in the bi-amped position.
4. Or insert in the bi-amped dual mid-range position.
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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
position.
3. Insert in the bi-amped position.
15
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Acoustical Specifications and Wiring
LT 3202®-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 character-
istics 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" com-
pression 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.
LT 3202-III speaker with grille
• Bi-amplified dual mid-range mode allows independent control of two pairs of V2 mid-fre-
quency drivers as well as control of the high-frequency driver. The mid-frequency and high-
frequency 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 high-
pass filter and low pass filter as shown.
LT 3202-III Acoustical Specifications
Passive
Bi-Amped
Bi-amped Dual Mid-range
Mid 2
Mid
High
Mid 1
High
3LLT 3202-III speaker without grille
1
Power Handling
280W
280W
75W
140W
140W
75W
Impedance
16 Ω
16 Ω
8 Ω
8 Ω
8 Ω
8 Ω
2
Sensitivity (at 1W @ 1m)
110 dB SPL
107 dB SPL
111 dB SPL
104 dB SPL
104 dB SPL
111 dB SPL
3
Maximum SPL
135 dB SPL
132 dB SPL
130 dB SPL
129 dB SPL
129 dB SPL
130 dB SPL
(pink noise @1m @ rated power)
Mid Frequency:
High Frequency:
Internal Crossover
@ 1.6 kHz
Recommended Crossover
HPF: 160 Hz, Butterworth, 4th order HPF: Butterworth, 4th order
LPF: Butterworth, 4th order
LPF: 1600 Hz, Butterworth, 4th order
200 Hz - 16 kHz
4
Frequency Range (± 3 dB)
Beamwidth
(-6dB point, average 800 - 5 kHz)
Horizontal: 36°, Vertical: 22°
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
3LT 3202-III speaker rear
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 mea-
sured 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
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Acoustical Specifications and Wiring
LT 3202®-III Loudspeaker Configurations
Passive
Bi-amped
Bi-amped Dual Mid-Range
LT 3202-III Loudspeaker Active Equalization Curves
17
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Acoustical Specifications and Wiring
LT 4402®-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" com-
pression 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.
LT 4402-III speaker with grille
LT 4402-III speaker without grille
LT 4402-III speaker rear
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 Acoustical Specifications
Passive
Bi-Amped
Mid
High
1
Power Handling
140W
140W
75W
Impedance
8 Ω
8 Ω
8 Ω
2
Sensitivity (at 1W @ 1m)
108 dB SPL
106 dB SPL
107 dB SPL
3
Maximum SPL
130 dB SPL
128 dB SPL
126 dB SPL
(pink noise @1m @ rated power)
Mid Frequency
Recommended Crossover
HPF: 160 Hz, Butterworth, 4th order
LPF: 1600 Hz, Butterworth, 4th order
High Frequency
HPF: 1600 Hz, Butterworth, 4th order
Internal Crossover @ 1.6 kHz
LPF: 20 kHz, Butterworth, 4th order
4
Frequency Range (± 3 dB)
180 Hz - 16 kHz
Beamwidth
(-6dB point, average 800 - 5 kHz)
Horizontal: 44°, Vertical: 38°
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 mea-
sured 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.
18
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Acoustical Specifications and Wiring
LT 4402®-III Loudspeaker Configurations
Passive
Bi-amped
LT 4402-III Loudspeaker Active Equalization Curves
19
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Acoustical Specifications and Wiring
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" com-
pression 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.
• In bi-amplified mode, the mid-frequency and high-frequency drivers are accessed through
separate pins on the Neutrik NL4 connectors.
LT9402-III speaker with grille
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.
LT 9402-III Acoustical Specifications
Passive
Bi-Amped
Mid
High
1
Power Handling
140W
140W
75W
Impedance
8 Ω
8 Ω
8 Ω
2
Sensitivity (at 1W @ 1m)
106 dB SPL
106 dB SPL
106 dB SPL
3
Maximum SPL
128 dB SPL
128 dB SPL
125 dB SPL
(pink noise @1m @ rated power)
Mid Frequency
LT9402-III speaker without grille
Recommended Crossover
HPF: 160 Hz, Butterworth, 4th order
LPF: 1600 Hz, Butterworth, 4th order
High Frequency
Internal Crossover @ 1.6 kHz
HPF: 1600 Hz, Butterworth, 4th order
LPF: 20 kHz, Butterworth, 4th order
4
Frequency Range (± 3 dB)
180 Hz - 16 kHz
Beamwidth
(-6dB point, average 800 - 5 kHz)
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 mea-
sured at 1 meter from the speaker in an anechoic environment.
4. Frequency Range
LT9402-III speaker rear
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.
20
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Acoustical Specifications and Wiring
LT 9402™-III Loudspeaker Configurations
Passive
Bi-amped
LT 9402-III Loudspeaker Active Equalization Curves
21
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Acoustical Specifications and Wiring
LT 9702®-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.
LT 9702-III speaker with grille
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 Acoustical Specifications
Passive
Bi-Amped
Mid
High
1
Power Handling
140W
140W
75W
Impedance
8 Ω
8 Ω
8 Ω
2
Sensitivity (at 1W @ 1m)
104 dB SPL
105 dB SPL
104 dB SPL
3
Maximum SPL
126 dB SPL
127 dB SPL
123 dB SPL
(pink noise @1m @ rated power)
LT 9702-III speaker without grille
Mid Frequency
Recommended Crossover
HPF: 160 Hz, Butterworth, 4th order
LPF: 1600 Hz, Butterworth, 4th order
High Frequency
HPF: 1600 Hz, Butterworth, 4th order
Internal Crossover @ 1.6 kHz
LPF: 20 kHz, Butterworth, 4th order
4
Frequency Range (± 3 dB)
180 Hz - 16 kHz
Beamwidth
(-6dB point, average 800 - 5 kHz)
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 loud-
speaker terminals corresponding to the power handling of the loudspeaker. The loudspeaker must show no visible damage or mea-
surable 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 mea-
sured at 1 meter from the speaker in an anechoic environment.
LT 9702-III speaker rear
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.
22
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Acoustical Specifications and Wiring
LT 9702®-III Loudspeaker Configurations
Passive
Bi-amped
LT 9702-III Loudspeaker Active Equalization Curves
23
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Acoustical Specifications and Wiring
LT MB24 Loudspeaker Product Description
The Panaray® LT MB24-III modular bass loudspeaker is a compact low-frequency loud-
speaker 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/high-
frequency loudspeakers. The LT MB24-III loudspeaker is the ideal bass extension solution for
any of the LT mid/high-frequency loudspeakers.
Each Panaray LT MB24-III bass loudspeaker uses two 12" low-frequency drivers built into a
proprietary acoustic enclosure.
LT MB24-III with grille
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 Acoustical Specifications
Parallel
Discrete
Driver 1
Driver 2
1
Power Handling
Impedance
800W
400W
400W
4 Ω
8 Ω
8 Ω
2
Sensitivity (at 1W @ 1m)
94 dB SPL
91 dB SPL
91 dB SPL
3
Maximum SPL
123 dB SPL
117 dB SPL
117 dB SPL
(pink noise @1m @ rated power)
HPF: 40Hz, Butterworth, 4th order
Recommended Crossover
LPF: 250Hz, Butterworth, 4th order
40 Hz - 250 Hz
4
Frequency Range (± 3 dB)
How our loudspeakers are measured
1. Power Handling
LT MB24-III rear
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 mea-
sured 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.
24
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Acoustical Specifications and Wiring
LT MB24-III Loudspeaker Configurations
Parallel
Discrete
LT MB24-III Loudspeaker Active Equalization Curve
25
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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
LT 4402®-II/III Passive EQ Card
LT 9702®-II/III Passive EQ Card
LT 9402TM-III Passive EQ Card
LT Series II MF EQ Card
011502
011504
017929
035325
018485
027058
LT MB24-III/MB4 EQ Card
Active equalization with the Bose® 1600-VI or 1800-VI amplifier
When using the Bose 1600-VI or 1800-VI amplifier to power Panaray LT Series III loudspeakers, optional active equaliza-
tion 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 loud-
speaker (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.
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 high-
pass filter and low-pass filter. The active equalization curves are located in the Acoustical Specifications and Wiring sec-
tion.
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 loud-
speakers. 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 driv-
ers.
LT MB24 Modular Bass Loudspeaker:
The LT MB24 requires the same active equalization for both parallel and discrete modes.
26
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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® Customer Service center nearest you. Request parts by the part number in the
left hand column above
Replacement part
Product
3202®-III
4402®-III
9402™-III
9702®-III
All
Part number
276843
276844
276845
276846
276847
276848
276851
276852
276853
276854
276860
276861
276849
276850
278244
3202-III Grille (includes screws)
4402-III Grille (includes screws)
9402-III Grille (includes screws)
9702-III Grille (includes screws)
Replacement Screws for grille
Replacement Logo
All
Input panel w/crossover board 3202
Input panel w/crossover board 4402
Input panel w/crossover board 9402
Input panel w/crossover board 9702
Compression driver
3202-III
4402-III
9402-III
9702-III
All
Diaphragm for compression driver
Compression driver plate w/screws
V2 assembly with drivers
All
All
All
Grille w/screws, tape, logo, tape, fastener and
spring
MB24-III
Screws for grille
MB24-III
MB24-III
MB24-III
MB24-III
276847
276848
278245
278248
Logo with tape, fastener and spring
Input panel w/molex connector
Woofer
27
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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 stan-
dards 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
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Service Information
To Replace the t1.4hp High-frequency Compression Driver in the Panaray®
LT 3202®-III, LT 4402®-III, LT 9402TM-III or LT 9702®-III Loudspeakers
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.
29
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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
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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 compres-
sion 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
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Service Information
To Replace the V-2 Mid-frequency Driver in the Panaray® LT 3202®-III
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.
32
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Service Information
To Replace the V-2 Mid-frequency Driver in the Panaray® LT 4402®-III,
LT 9402TM-III or LT 9702® -III Loudspeakers
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.
.
33
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Service Information
To Replace the 12" Woofer in the Panaray LT MB24-III Modular Bass Loud-
speaker
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
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Service Information
Driver and Electronics Assembly
LT 3202®-III Loudspeaker
1
2
Logo, Panaray LT
9
Disk, Align, Compression Driver
Screw, KM 4x12
17
18
Washer
Kit, Grille Screw, TA 4x15
(14 screws per kit)
10
Screw TM 4x15
3
4
Cap, Spring
Spring, Logo
11
12
Screw, KM 6x12
19
20
V2 Assembly
Plate, Mount, Compression Driver
Gasket, Input Manifold
5
6
Clip, Retaining, Logo
13
14
Screw, TM 6x30
21
22
Manifold, V2
Grille Assembly, includes: screws,
tape, logo, fastener and spring
Compression Driver
Gasket, Output Manifold
7
8
Gasket, Grille
15
16
Gasket, Rear Panel
Panel, Rear
23
Input Panel with Crossover PCB
Gasket, Compression Driver 1
35
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Service Information
LT 4402®-III Loudspeaker
1
Grille Assembly, includes: screws,
tape, logo, fastener and spring
9
Screw, TM 6x30
17
Manifold, V2
2
3
Gasket, Grille
10
11
Compression Driver
Gasket Panel
18
19
Gasket, Output Manifold
Panel, Input
Kit, Grille Screw, TA 4x15
(14 screws per kit)
4
5
6
7
8
Gasket, Compression Driver
Disk, Alignment, Compression Driver
Screw, KM 4x12
12
13
14
15
16
Panel, Rear
20
21
22
23
Standoffs for Crossover PCB
Input Panel with Crossover PCB
Screw, KM 3x12
Screw TM 4x15
V2 Assembly
Screw, KM 6x12
Gasket, Upper Flange
Gasket, Input Manifold
Gasket, Input Panel
Plate, Mount, Compression Driver
36
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Service Information
LT 9402TM-III Loudspeaker
1
8
9
10 11 12 13 14 15 16
1
2
3
17
18
19
4
5
6
20
7
24 23 22 21
1
Kit, Grille Screw, TA 4x15
(14 screws per kit)
9
Disk, Alignment, Compression Driver
17
Screw, TM 4x15
2
3
Logo, Panaray LT
10
11
Screw, KM 4x12
Screw, KM 6x12r
18
19
Manifold, V2
Grille Assembly, includes: screws,
tape, logo, fastener and spring
Gasket, Input Manifold
4
5
6
7
8
Cap, Spring
12
13
14
15
16
Plate, Mount, Compression Driver
Screw, TM 6x30
20
21
22
23
24
V2 assembly
Spring, Logo
Gasket, Output Manifold
Panel, Input with Crossover
Gasket, Input Panel
Screw, KM 3x12
Clip, Retaining, Logo
Gasket, Grille
Compression Driver
Gasket, Panel
Gasket, Compression Driver
Panel, Rear
37
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Service Information
LT 9702®-III Loudspeaker
1
2
Grille Assembly, includes: screws,
tape, logo, fastener and spring
10
11
Screw, KM 4x12
Screw, KM 6x12
19
20
Gasket, Input Manifold
Manifold, V2
Kit, Grille Screw, TA 4x15
(14 screws per kit)
3
4
5
6
7
8
9
Clip, Retaining, Logo
Spring, Logo
12
13
14
15
16
17
18
Plate, Mount, Compression Driver
Screw, TM 6x30
21
22
23
24
25
26
Gasket, Output Manifold
Panel, Input with Crossover
Standoffs for Input Panel PCB
Input Panel, PCB
Cap, Spring
Compression Driver
Gasket, Panel
Logo, Panaray LT
Gasket, Grille
Panel, Rear
Screw, KM 3x12
Gasket, Compression Driver
Disk, Alignment, Compression Driver
Screw, TM 4x15
Gasket, Input Panel
V2 Assembly
38
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Service Information
LT MB24-III Loudspeaker
1
2
Gasket, Grille, MB24 Bass Module
5
6
Gasket, Input Panel
Input Panel Kit
Grille Assembly, includes: screws,
logo, tape, fastener and spring
3
4
Grille Screw Kit (14 screws)
Gasket, Woofer
7
8
Woofer Assembly, 12-inch, TBX
Screw, Woofer
39
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©2004 Bose Corporation, the Mountain,
Framingham, MA 01701-9168 USA
269724 AM Rev.00 cmm-040235
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