Bosch LBC3493-12-US, LBC3492-12-US, LBC3491-12-US Specsheet

Communication Systems | LBC 34xx/12 Horn Loudspeakers

LBC 34xx/12 Horn Loudspeakers

High efficiency drivers

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Up to 45 W (max. power)

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Wide opening angle

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Excellent speech reproduction

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Simple power setting

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Water- and dust protected to IP 65

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Versatile mounting bracket

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Comply with international installation and safety

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regulations

Bosch high-efficiency horn loudspeakers provide
excellent speech reproduction and sound distribution
for a wide scope of outdoor applications. They are ideal
for sports grounds, parks, exhibitions, factories and
swimming pools.

Functions

All four models are for direct connection to a 100 V line
output and are finished in light grey (RAL 7035). The
horns are water and dust protected.
The horn loudspeakers include a 100 V transformer with
taps on the primary winding to allow different power
settings. Nominal full-power, half-power or quarter­power radiation (i.e. in 3 dB steps) can easily be
selected by connecting the amplifier output to the
appropriate tap. A two meter long four-core cable is
fitted to the horns. Each core is a different color, and is
connected to one of the primary taps on the
transformer.
The horn loudspeakers are supplied complete with
sturdy adjustable mounting brackets, allowing the
sound beam to be accurately directed.

System Overview

The LBC 3481/12 is a circular horn loudspeaker with
15 W (max power) which is made from ABS
The LBC 3491/12 is a rectangular model with 15 W
(max power) and is made from ABS.
The 30 W (max power) LBC 3492/12 is a circular
loudspeaker with a large horn measuring 354mm in
diameter. It is made from a combination of aluminum
with ABS for optimum strength and low weight. The
edge of the horn is covered with a PVC profile for
protection against impact damage.
The 45 W (max power) LBC 3493/12 is a circular
loudspeaker with a large horn measuring 400mm in
diameter. It is made from a combination of aluminum
with ABS for optimum strength and low weight. The
edge of the horn is covered with PVC for protection
against impact damage.

Certifications and Approvals

All Bosch loudspeakers are designed to withstand
operating at their rated power for 100 hours in
accordance with IEC 268-5 Power Handling Capacity
(PHC) standards. Bosch has also developed the
Simulated Acoustical Feedback Exposure (SAFE) test to
demonstrate that they can withstand two times their

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2 | LBC 34xx/12 Horn Loudspeakers

rated power for short durations. This ensures extra
reliability under extreme conditions, leading to higher
customer satisfaction, longer operating life, and much
less chance of failure or performance deterioration.

Safety EN 60065
Self-Extinguishing according to UL94V0

Installation/Configuration Notes

LBC 3481/12

Dimensions (in mm/inch)

Circuit diagram

Polar diagram (measured with pink noise)

Octave band
(Hz)

SPL 1.1 - - 94 103 105 98 86
SPL max. - - 104 113 115 108 96
Q-factor - - 1.7 3.5 7.8 25.7 52.5
Efficiency - - 1.82 7.08 5.13 0.31 0.01
Hor. angle - - 180 160 95 50 30
Vert. angle - - 180 160 95 50 30

125 250 500 1k 2k 4k 8k

Quick reference table

LBC 3491/12

Frequency response

Dimensions (in mm/inch)

Circuit diagram

Frequency response

LBC 34xx/12 Horn Loudspeakers | 3

Octave band
(Hz)

SPL 1.1 - - 99 108 111 106 97
SPL max. - - 109 118 121 116 107
Q-factor - - 2.7 6.5 15.8 40.7 75.9
Efficiency - - 3.72 12.3 10 1.23 0.08
Hor. angle - - 180 90 55 40 30
Vert. angle - - 180 130 80 45 15

125 250 500 1k 2k 4k 8k

Quick reference table

Polar diagram vertical (measured with pink noise)

Polar diagram horizontal (measured with pink noise)

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4 | LBC 34xx/12 Horn Loudspeakers

LBC 3492/12

Dimensions (in mm/inch)

Circuit diagram

Frequency response

Polar diagram (measured with pink noise)

Octave
band (Hz)

SPL 1.1 - 93 105 110 112 104 90
SPL max. - 106 118 123 125 117 103
Q-factor - 2.2 3.5 10.7 30.9 57.5 75.9
Efficiency - 1.15 11.22 11.75 6.46 0.55 0.02
H. angle - 180 145 80 45 35 30
V. angle - 180 145 80 45 35 30

125 250 500 1k 2k 4k 8k

Quick reference table

LBC 3493/12

Dimensions (in mm/inch)

LBC 34xx/12 Horn Loudspeakers | 5

Circuit diagram

Frequency response

Polar diagram (measured with pink noise)

Octave
band (Hz)

SPL 1.1 - 92 105 111 112 104 90
SPL max. - 107 120 126 127 119 105
Q-factor - 2.6 5.1 15.1 37.2 61.7 74.1
Efficiency - 0.78 7.76 10.47 5.37 0.41 0.02
H. angle - 180 120 70 45 40 30
V. angle - 180 120 70 45 40 30

125 250 500 1k 2k 4k 8k

Quick reference table

Parts Included

Quantity Components
1 LBC 34xx/12 Horn loudspeaker

Ordering Information

Model | Description
LBC 3481/12 Horn Loudspeaker, Circular, 10 W
LBC 3491/12 Horn Loudspeaker, Rectangular, 10 W
LBC 3492/12 Horn Loudspeaker, Circular, 20 W
LBC 3493/12 Horn Loudspeaker, Circular, 30 W
Hardware Accessories
LBC 1256/00 EVAC Connection Adapter

3-pole screw connector (100 pcs)

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6 | LBC 34xx/12 Horn Loudspeakers

LBC 34xx/12 Horn Loudspeakers

LBC 3481/12 LBC 3491/12 LBC 3492/12 LBC 3493/12
Electrical
Max. Power 15 W 15 W 30 W 45 W
Rated Power (PHC) 10 W

(10 - 5 - 2.5 W)

Sound Pressure Level at
Rated
Power/1 W
(at 1 kHz, 1 m)

113 dB / 103 dB (SPL) 118 dB / 108 dB (SPL) 123 dB / 110 dB (SPL) 126 dB / 111 dB (SPL)

Effective Frequency

500Hz-7kHz 480Hz-5.5kHz 380Hz-5.5kHz 380Hz-5kHz

Range (-10 dB)
Opening Angle

(1 kHz/4 kHz, -6 dB)
Mechanical
Horizontal 160° / 50° 90° / 40° 80° / 35° 70° / 40°
Vertical 160° / 50° 130° / 45° 80° / 35° 70° / 40°
Rated Voltage 100 V 100 V 100 V 100 V
Rated Impedance 1000 ohm 1000 ohm 500 ohm 333 ohm
Connection 4-wire cable

2 m long
Dimensions
aperture (LxW) - 267 x 171 mm

Aperture Dia. 156 mm

(6.14 inch)

Overall Length 184 mm

(7.24 inch)
Color Light grey RAL 7035 Light grey RAL 7035 Light grey RAL 7035 Light grey RAL 7035
Weight 1.25 kg

(2.75 lb)
Environmental
Ambient Temperature -25°C to +55 °C -25°C to +55 °C -25°C to +55 °C -25°C to +55 °C

10 W

(10-5-2.5W )

4-wire cable

2 m long

10.51 x 6.73 inch

- 354 mm

276 mm

(10.87 inch)

1.4 kg

(3.08 lb)

20 W

(20-10-5 W)

4-wire cable

2 m long

- -

(13.94 inch)

332 mm

(13.07 inch)

2.65 kg

(5.83 lb)

30 W

(30-15-7.5 W)

4-wire cable

2 m long

400 mm

(15.75 inch)

353 mm

(13.90 inch)

3 kg

(6.6 lb)

Americas:
Bosch Security Systems
130 Perinton Parkway
Fairport, New York, 14450, USA
Phone: [phone]
Fax: [phone]
[e-mail]
www.boschsecurity.us

© Bosch Security Systems, 2005 | Data subject to change without notice | 12. Dec. 2005

Europe, Middle East, Africa:
Bosch Security Systems B.V.
P.O. Box 80002
5600 JB Eindhoven, The Netherlands
Phone: [phone]
Fax: [phone]
[e-mail]
www.boschsecurity.com

Asia-Pacific:
Bosch Security Systems Pte Ltd
38C Jalan Pemimpin
Singapore 577180
Phone: [phone]
Fax: [phone]
[e-mail]
www.boschsecurity.com

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