LBC3432/03 - Loudspeaker BOSCH - Free user manual and instructions

Product Type	Sound projector, 20W metal unidirectional
Model	LBC3432/03
Dimensions (D x L)	146 x 200 mm (5.7 x 7.9 in)
Weight	2.6 kg (5.7 lb)
Color	White (RAL 9010)
Material	Aluminum
Rated Power	20 W
Power Tapping	20/10/5/2.5 W (1.25 W at 70 V only)
Rated Voltage	70 V / 100 V
Impedance (20 W tap)	250 Ω (70 V) / 500 Ω (100 V)
Sound Pressure Level (20 W, 1 m)	107 dB SPL
Sound Pressure Level (1 W, 1 m)	94 dB SPL
Frequency Range (-10 dB)	170 Hz – 20 kHz
Opening Angle (-6 dB)	224° (1 kHz) / 56° (4 kHz)
Connector	Screw terminal block
Cable Diameter	6 – 12 mm (0.24 – 0.47 in)
Operating Temperature	-25 °C to +55 °C (-13 °F to +131 °F)
Storage Temperature	-40 °C to +70 °C (-40 °F to +158 °F)
Relative Humidity	< 95%
Ingress Protection	IP66 (EN 60529)
Compliance	EN 54-24 (voice alarm systems)
Mounting	Metal bracket included

Frequently Asked Questions - LBC3432/03 BOSCH

How do I install the LBC3432/03 sound projector?

The speaker comes with a metal mounting bracket. Refer to the installation diagrams in the manual (Fig. 1–12). Secure the bracket to a sturdy surface, attach the speaker, and connect wiring via the screw terminal block. Ensure proper cable diameter (6–12 mm) and observe the power tapping settings.

What tools are needed for installation?

Basic tools: screwdriver for the terminal block, appropriate drill/driver for mounting the bracket, and stripping tools for the cable. No special tools are required.

How do I select the correct power tapping?

The speaker supports 20/10/5/2.5 W taps (plus 1.25 W on 70 V only). Choose the tap that matches your system's amplifier power and desired SPL. The impedance varies per tap; see the technical table in the manual.

Is the LBC3432/03 suitable for outdoor use?

Yes, it has an IP66 rating, making it dust-tight and protected against powerful water jets. Operating temperature range is -25 °C to +55 °C, so it can be used in most outdoor environments.

Can the speaker be painted?

The speaker is white (RAL 9010) aluminum. Painting is possible with suitable outdoor paint, but it may affect the acoustic performance. Bosch recommends keeping it as original.

What is the coverage angle of this speaker?

The opening angle (-6 dB) is 224° at 1 kHz and 56° at 4 kHz. This provides broad coverage at lower frequencies and narrower dispersion at higher frequencies, ideal for directed sound.

How do I clean the speaker?

Use a soft, dry cloth to wipe the exterior. Do not use solvents or abrasive cleaners. The aluminum body is durable, but avoid scratching the grille.

Is this speaker compatible with 70V and 100V line systems?

Yes, it supports both 70 V and 100 V line voltage. Select the appropriate tap and impedance accordingly.

What safety precautions should I follow?

Disconnect power before installation or maintenance. Ensure the speaker is securely mounted to avoid falling. Use cables with sufficient diameter and proper insulation. The unit complies with EN 54-24 for fire alarm systems.

Does the LBC3432/03 come with a warranty?

Bosch Security Systems provides a standard warranty. For exact terms, check the documentation included with the product or contact Bosch support. Retain proof of purchase.

USER MANUAL LBC3432/03 BOSCH

Sound projector 20W metal unidirectional

LBC3432/03

en

Installation Note

1 Installation

Fig. 1 Fig. 2

Fig. 3 Fig. 4

Fig. 5 Fig. 6 Optional

Fig. 7 Fig. 8 Optional

Fig. 9 Fig. 10 Optional Optional

Fig. 11 Fig. 12 Optional Optional

2 Technical data

2.1 Electrical

Rated power (PHC) 20 W
Power tapping	20 / 10 / 5 / 2.5 W(1.25 W, 70 V only)
Sound pressure levelat 20 W / 1 W (1kHz, 1 m)	107 / 94 dB (SPL)
Sound pressure levelat 20 W / 1 W (1kHz, 4 m)	95 / 82 dB (SPL)
Opening angleat 1 kHz / 4 kHz (-6 dB)	224° / 56°
Effective frequency range (-10 dB) 170 Hz to 20 kHz
Rated voltageRated impedance		70 V 100 V
	20 W 250 Ohm	500 Ohm
	10 W 500 Ohm	1000 Ohm
	5 W 1000 Ohm	2000 Ohm
	2.5 W 2000 Ohm	4000 Ohm
	1.25 W 4000 Ohm	N.A.

* Technical performance data acc. to IEC 60268-5

2.2 Mechanical

Dimensions (D x L)	146 x 200 mm (5.7 x 7.9 in)
Weight	2.6 kg (5.7 lb)
Color	White (RAL 9010)
Material	Aluminum
Connector	Screw terminal block
Cable diameter	6-12 mm (0.24-0.47 in)

2.3 Environmental conditions

Operating temperature	-25 °C to +55 °C (-13 °F to +131 °F)
Storage and transport temperature	-40 °C to +70 °C (-40 °F to +158 °F)
Relative humidity <95%
Water/dust protected According to EN 605	29 IP66

Note:

• The specification data is measured in an anechoic chamber, free field.
• The reference axis is perpendicular to the center point of the front grille.
• The reference plane is perpendicular to the center of the reference axis.
• The horizontal plane is perpendicular to the center of the reference plane.

CE 1438

Bosch Security Systems BV Torenallee 49, 5617 BA Eindhoven, the Netherlands 13 1438/CPD/0328

EN 54-24:2008 Loudspeaker for voice alarm systems for fire detection and fire alarm systems for buildings Sound Projector 20 W LBC3432/03 Type B DoP: LP052914

Figure 2.1: CE label

2.4 Additional technical data

Dimensions mm (in) Circuit diagram

Frequency response

Polar diagram (measured with pink noise) Polar diagram (measured with pink noise)

Bosch Security Systems B.V.

Torenallee 49

5617 BA Eindhoven

Netherlands