Bose Car Speaker LT 4402 User Manual

Bose® Panaray® LT Series III Loudspeakers  
Reference Guide  
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Contents  
Safety Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  
Mounting Guidelines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  
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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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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  
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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.  
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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.  
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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.  
13  
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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.  
14  
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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  
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 Congurations  
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  
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 Congurations  
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 Congurations  
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 Congurations  
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.  
.
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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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