Bosch LB20 User manual

LB20 Premium Subwoofer
LB20‑SW400‑D | LB20‑SW400‑L
en Installation manual

LB20 Premium Subwoofer Table of contents | en 3
Bosch Security Systems B.V. Installation manual 2018.07 | 02 | F.01U.345.356
Table of contents
1Safety 4
1.1 Suspension 4
1.2 Notices 4
2Short information 5
3Introduction 6
3.1 System features 6
3.2 Packing list 7
3.3 Product information 8
4Installation 9
4.1 Suspending the subwoofer 9
4.2 Replacing the logo 10
4.3 Installing the IP65 port covers 11
4.4 Installing the U-bracket - optional accessory 12
4.5 Installing the transformer input panel - optional accessory 12
4.6 Installing the crossover input panel - optional accessory 14
5Wiring 15
5.1 Standard input panel 15
5.1.1 Mono operation 15
5.1.2 Stereo operation 16
5.2 Transformer input panel - optional accessory 17
5.2.1 Mono operation 17
5.2.2 Stereo operation 19
5.3 Crossover input panel - optional accessory 20
5.3.1 Mono operation 20
5.3.2 Stereo operation 21
6Troubleshooting 23
7Technical data 24
7.1 Dimensions 25
7.2 Frequency response and impedance 25
8U-bracket dimensions - optional accessory 27

4en | Safety LB20 Premium Subwoofer
2018.07 | 02 | F.01U.345.356 Installation manual Bosch Security Systems B.V.
1 Safety
1.1 Suspension
!
Warning!
Suspending any object is potentially dangerous and should only be attempted by individuals
who have thorough knowledge of the techniques and regulations of suspending objects
overhead. Bosch strongly recommends all loudspeakers be suspended taking into account all
current national, federal, state, and local laws and regulations. It is the responsibility of the
installer to ensure all loudspeakers are safely installed in accordance with all such
requirements. When loudspeakers are suspended, Bosch strongly recommends the system be
inspected at least once per year or as laws and regulations require. If any sign of weakness or
damage is detected, remedial action should be taken immediately. The user is responsible for
making sure the wall, ceiling, or structure is capable of supporting all objects suspended
overhead. Any hardware used to suspend a loudspeaker not associated with Bosch is the
responsibility of others.
Safety point
As an added safety measure, it is suggested the user install an extra suspension point back to
the building structural supports. This safety point should have as little slack as possible (less
than 1-inch is preferable).
1.2 Notices
Old electrical and electronic appliances
Electrical or electronic devices that are no longer serviceable must be collected separately and
sent for environmentally compatible recycling (in accordance with the European Waste
Electrical and Electronic Equipment Directive).
To dispose of old electrical or electronic devices, you should use the return and collection
systems put in place in the country concerned.
Copyright and disclaimer
All rights reserved. No part of this document may be reproduced or transmitted in any form by
any means, electronic, mechanical, photocopying, recording, or otherwise, without the prior
written permission of the publisher. For information on getting permission for reprints and
excerpts, contact Bosch Security Systems, Inc.
The content and illustrations are subject to change without prior notice.

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2 Short information
The following table lists products in a family, with CTN (Commercial Type Number) and
identifying product name DESCRIPTION.
CTN Description
LB20-SW400-D Cabinet subwoofer 2x10" black
LB20-SW400-L Cabinet subwoofer 2x10" white
UB-10DB U-bracket for 10" subwoofer black
UB-10DW U-bracket for 10" subwoofer white
IP-10D-TB Transformer input 10" subwoofer bk
IP-10D-TW Transformer input 10" subwoofer wh
IP-10D-CB Crossover input 10" subwoofer bk
IP-10D-CW Crossover input 10" subwoofer wh

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2018.07 | 02 | F.01U.345.356 Installation manual Bosch Security Systems B.V.
3 Introduction
The LB20-SW400 subwoofer, from Bosch Security Systems, Inc, is a compact, high-
performance, dual woofer loudspeaker with outstanding performance for the most demanding
professional and commercial sound applications. Designed and engineered for use in
background and foreground music, and sound reinforcement applications, the LB20-SW400
subwoofer is the ideal solution for indoor and outdoor applications, such as restaurants, bars,
patios, retail, fitness clubs, hospitality, theme parks, leisure venues, and others. Ease of
installation, and flexible options for mounting solutions and weather resistance, the LB20-
SW400 subwoofer is the perfect solution for a wide variety of surface mount applications.
The LB20-SW400 subwoofer has been carefully engineered to resist outdoor environments,
without compromising on performance for indoor applications. The subwoofer is IP54 rated,
and its weather-proofing is complemented with exceptional cabinet and grille resistance
against sun, salt and moisture. For the toughest weather conditions, the IP rating of the LB20-
SW400 subwoofer can be upgraded to IP65, using the included port plug accessory.
Read through this manual to familiarize yourself with the safety information, features, and
applications before you use these products.
3.1 System features
– Two 10 inch high-excursion woofers
– Carefully engineered for outdoor environments (IP54 and IP65), without compromising
performance
– 400 W power handling provides for 120 dB maximum SPL (126 dB peak)
– 70/100 V transformer input panel accessory available
– Crossover input panel accessory available

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3.2 Packing list
Quantity Component
A 1 Subwoofer
B 5 Mounting point covers
C 1 Logo (spare)
D 1 Allen wrench
E 1 Weather input cover
F 8 Screws for weather input cover
G 2 IP65 port covers
H 12 IP65 port cover screws
I 1 Installation manual
Tab.3.1: Components list
A (x 1) C
I
EF (x 8) G (x 2) H (x 12)
D
B (x 5)
Figure3.1: Components

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3.3 Product information
A
B
F
G
C
E
D
Figure3.2: Product information (subwoofer on the right is shown upside down)
Item Description
A Grille
B U-bracket mounting points
C M10 flying points
D M10 safety point
E Input panel
F Subwoofer feet
G Weather input cover
Tab.3.2: Product information

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4 Installation
For safety, ensure the mounting surface supports more than the weight of the speaker. Use
only industry-accepted fasteners and mounting methods when mounting the loudspeaker.
Consult an expert if you are unsure.
!
Caution!
It is the installer's responsibility to determine and use the proper mounting hardware for the
wall construction type.
Disregarding this caution could result in damage to the product and personal injuries may
occur.
Safety point
As an added safety measure, it is suggested the user install an extra suspension point back to
the building structural supports. This safety point should have as little slack as possible (less
than 1-inch is preferable).
4.1 Suspending the subwoofer
To suspend the subwoofer, do the following:
1. Turn the subwoofer upside down.
2. Remove the two subwoofer feet with the supplied Allen wrench.
3. Attach the mounting point covers on the U-bracket mounting points.
4. Rotate the logo by replacing it, as shown in the Replacing the logo section.
5. Install four 10-mm rated forged eyebolts (not included) into the threaded fly points.

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6. Install a 10-mm rated forged eyebolt (not included) into the safety point.
7. Suspend the subwoofer from the eyebolts using rated fittings and steel cable.
8. Secure the subwoofer from the safety eyebolt using rated fittings and steel cable.
See also
– Replacing the logo, page 10
4.2 Replacing the logo
An additional logo is included, vertical installation is shown.
To replace the logo, do the following:
1. Remove the existing logo.
2. Clean the surface with alcohol.
3. Align the square guide on the rear of the logo with the square guide on the grille.
This view is showing the grille and the logo from the rear.
4. Remove the paper backing.

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5. Insert the logo.
Press firmly to ensure the logo is applied.
4.3 Installing the IP65 port covers
To install the IP65 port covers, do the following:
!
Caution!
Ensure you securely tighten the screws for the IP65 port cover to prevent water leaks.
If the IP65 port cover is not properly installed, you may cause damage to the subwoofer.
1. Remove the grille.
2. Install the IP65 port cover.
Repeat step this step to install the second IP65 port cover.

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3. Reinstall the grille.
4.4 Installing the U-bracket - optional accessory
To install the U-bracket, do the following:
1. Install the four screws (provided) into the U-bracket mounting points.
2. Install a 10-mm rated forged eyebolt (not included) into the safety point.
3. Secure the subwoofer from the safety eyebolt using a rated fittings and steel cable.
Suspending the subwoofer in a down-fire position using the U-bracket
To suspend the subwoofer in a horizontal down-fire position, do the following:
1. Install two 10-mm rated forged eyebolts using lock washers (eyebolts and lock washers
are not included) into the fly points on the U-bracket.
2. Install a 10-mm rated forged eyebolt (not included) into the safety point.
3. Suspend the subwoofer from the eyebolts using rated fittings and steel cable.
4. Secure the subwoofer from the safety eyebolt using a rated fittings and steel cable.
4.5 Installing the transformer input panel - optional accessory
To install the transformer input panel, do the following:

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1. Remove the standard input panel.
2. Disconnect the standard input panel.
3. Connect the transformer input panel.
4. Install the transformer input panel.
5. Install the weather cover, if applicable.

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4.6 Installing the crossover input panel - optional accessory
To install the crossover input panel, do the following:
1. Remove the standard input panel.
2. Disconnect the standard input panel.
3. Connect the crossover input panel.
4. Install the crossover input panel.
5. Install the weather cover, if applicable.

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5 Wiring
5.1 Standard input panel
5.1.1 Mono operation
!
Caution!
For mono operation only use either the first two pins or the last two pins of the FR/IN
connector. Do not wire the amplifier to all four pins.
May cause damage to the amplifier if connected improperly.
The amplifier, the subwoofer, and the speakers are wired for MONO operation. It is highly
advisable to support the unit while these connections are being made. Connect all wires to
the speaker at the back terminal plate observing proper polarity of the connections. After all
connections are made test the complete system operation.
A: Full-range parallel out
B: STEREO/MONO switch set to mono.
Fault
Signal/Clip
CH1 CH2 CH3 CH4
A
B

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5.1.2 Stereo operation
The amplifier, the subwoofer, and the speakers are wired for STEREO operation. It is highly
advisable to support the unit while these connections are being made. Connect all wires to
the speaker at the back terminal plate observing proper polarity of the connections. After all
connections are made test the complete system operation.
A: Full-range parallel out
B: STEREO/MONO switch set to stereo.
Fault
Signal/Clip
CH1 CH2 CH3 CH4
A
B

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5.2 Transformer input panel - optional accessory
5.2.1 Mono operation
!
Caution!
For mono operation only use either the first two pins or the last two pins of the FR/IN
connector. Do not wire the amplifier to all four pins.
May cause damage to the amplifier if connected improperly.
The amplifier, the subwoofer, and the speakers are wired for MONO operation. It is highly
advisable to support the unit while these connections are being made. Connect all wires to
the speaker at the back terminal plate observing proper polarity of the connections. After all
connections are made test the complete system operation.
The speakers must be set to 70V/100V mode.
A: STEREO/MONO switch set to mono.
Fault
Signal/Clip
CH1 CH2 CH3 CH4
A
Figure5.1: Mono configuration 1

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A: STEREO/MONO switch set to mono.
Fault
Signal/Clip
CH1 CH2 CH3 CH4
A
Figure5.2: Mono configuration 2

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5.2.2 Stereo operation
The amplifier, the subwoofer, and the speakers are wired for STEREO operation. It is highly
advisable to support the unit while these connections are being made. Connect all wires to
the speaker at the back terminal plate observing proper polarity of the connections. After all
connections are made test the complete system operation.
The speakers must be set to 70V/100V mode.
A: STEREO/MONO switch set to stereo.
Fault
Signal/Clip
CH1 CH2 CH3 CH4
A

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2018.07 | 02 | F.01U.345.356 Installation manual Bosch Security Systems B.V.
5.3 Crossover input panel - optional accessory
5.3.1 Mono operation
!
Caution!
For mono operation only use either the first two pins or the last two pins of the FR/IN
connector. Do not wire the amplifier to all four pins.
May cause damage to the amplifier if connected improperly.
The amplifier, the subwoofer, and the speakers are wired for MONO operation. It is highly
advisable to support the unit while these connections are being made. Connect all wires to
the speaker at the back terminal plate observing proper polarity of the connections. After all
connections are made test the complete system operation.
The option shown is using 8 ohm speakers.
A: STEREO/MONO switch set to mono.
B: HI-PASS 4 OHM/8 OHM switch set to 8 ohm.
Fault
Signal/Clip
CH1 CH2 CH3 CH4
A
B