Communications 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.
System Overview
The LBC 3481/12 is a circular horn loudspeaker, and the
LBC 3491/12 is a rectangular model. Both are 10 W, and
are made from ABS.
The LBC 3492/12 is a circular, 20 W horn loudspeaker
with a large horn measuring 354 mm 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 LBC 3493/12 is a circular, 30 W horn loudspeaker
with a large horn measuring 400 mm 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.
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 quarter-power
radiation (in 3 dB steps) can easily be selected by
connecting the amplifier output to the appropriate tap. A
2 m 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.
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 rated power for
short durations. This ensures extra reliability under
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2 | LBC 34xx/12 Horn Loudspeakers
extreme conditions, leading to higher customer
satisfaction, longer operating life, and much less chance
of failure or performance deterioration.
Region Certification
Europe CE Declaration of Conformity
Safety acc. to EN 60065
Self-extinguishing acc. to UL 94 V0
Water and dust protection acc. to EN 60529‑IP65
Installation/Configuration Notes
LBC 3481/12
Frequency response
Dimensions in mm (in)
Circuit diagram
Polar diagram (measured with pink noise)
125 Hz 250 Hz 500 Hz 1 kHz 2 kHz 4 kHz 8 kHz
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
H. angle - - 180 160 95 50 30
V. angle - - 180 160 95 50 30
Acoustical performance specified per octave
LBC 3491/12
Dimensions in mm (in)
LBC 34xx/12 Horn Loudspeakers | 3
Circuit diagram
Frequency response
125 Hz 250 Hz 500 Hz 1 kHz 2 kHz 4 kHz 8 kHz
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
H. angle - - 180 90 55 40 30
V. angle - - 180 130 80 45 15
Polar diagram vertical (measured with pink noise)
Polar diagram horizontal (measured with pink noise)
Acoustical performance specified per octave
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4 | LBC 34xx/12 Horn Loudspeakers
LBC 3492/12
Dimensions in mm (in)
Circuit diagram
Frequency response
Polar diagram (measured with pink noise)
125 Hz 250 Hz 500 Hz 1 kHz 2 kHz 4 kHz 8 kHz
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
Acoustical performance specified per octave
LBC 3493/12
Dimensions in mm (in)
Circuit diagram
Frequency response
LBC 34xx/12 Horn Loudspeakers | 5
125 Hz 250 Hz 500 Hz 1 kHz 2 kHz 4 kHz 8 kHz
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
Acoustical performance specified per octave
Ordering Information
LBC 3481/12 Horn Loudspeaker, Circular,
10 W
10 W, circular
LBC 3491/12 Horn Loudspeaker,
Rectangular, 10 W
10 W, rectangular
LBC 3492/12 Horn Loudspeaker, Circular,
20 W
20 W, circular
LBC 3493/12 Horn Loudspeaker, Circular,
30 W
30 W, circular
Accessories
LBC 1256/00 EVAC Connection Adapter
3-pole screw connector, 100 pieces
LBC3481/12
LBC3491/12
LBC3492/12
LBC3493/12
LBC1256/00
Polar diagram (measured with pink noise)
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6 | LBC 34xx/12 Horn Loudspeakers
Technical Specifications
LBC3481/12 LBC3491/12 LBC3492/12 LBC3493/12
Electrical
Max power
Rated power (PHC)
Sound pressure level
at rated power / 1 W
(1 kHz, 1 m)
Sound pressure level
at rated power / 1 W
(2 kHz, 1 m)
Effective frequency range
(-10 dB)
Opening angle
horizontal
vertical
Rated voltage
Rated impedance
Connection
Mechanical
Dimensions (L x W)
Aperture (L x W)
Aperture diameter
Overall length
Color
Weight
15 W 15 W 30 W 45 W
10 / 5 / 2.5 W 10 / 5 / 2.5 W 20 / 10 / 5 W 30 / 15 / 7.5 W
113 dB / 103 dB (SPL) 118 dB / 108 dB (SPL) 123 dB / 110 dB (SPL) 126 dB / 111 dB (SPL)
115 dB / 105 dB (SPL) 121 dB / 111 dB (SPL) 125 dB / 112 dB (SPL) 127 dB / 112 dB (SPL)
500Hz to 7kHz 480Hz to 5.5kHz 380Hz to 5.5kHz 380Hz to 5kHz
1 kHz / 4 kHz (-6 dB)
160° / 50°
160° / 50°
1 kHz / 4 kHz (-6 dB)
90° / 40°
130° / 45°
1 kHz / 4 kHz (-6 dB)
80° / 35°
80° / 35°
1 kHz / 4 kHz (-6 dB)
70° / 40°
70° / 40°
100 V 100 V 100 V 100 V
1000 ohm 1000 ohm 500 ohm 333 ohm
2 m, 4-wire cable 2 m, 4-wire cable 2 m, 4-wire cable 2 m, 4-wire cable
- 267 x 171 mm
- -
10.51 x 6.73 in
- - - -
156 mm (6.14 in) 171 x 267 mm
354 mm (13.94 in) 400 mm (15.75 in)
(6.73 x 10.51 in)
184 mm (7.24 in) 276 mm (10.87 in) 332 mm (13.07 in) 353 mm (13.90 in)
Light grey (RAL 7035) Light grey (RAL 7035) Light grey (RAL 7035) Light grey (RAL 7035)
1.25 kg (2.75 lb) 1.4 kg (3.08 lb) 2.65 kg (5.83 lb) 3 kg (6.6 lb)
Environmental
Operating temperature
-25 ºC to +55 ºC
(-13 ºF to +131 ºF)
Storage temperature
-40 ºC to +70 ºC
(-40 ºF to +158 ºF)
Relative humidity
Americas:
Bosch Communications Systems
12000 Portland Avenue South
Burnsville, Minnesota 55337, USA
Phone: +1-800-392-3497
Fax: +1-800-955-6831
audiosupport@us.bosch.com
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© Bosch Security Systems Inc. 011 | Data subject to change without notice
T871454603 | Cur: en-US, V23, 27 Jan 2011
Europe, Middle East, Africa:
Bosch Security Systems B.V.
P.O. Box 80002
5600 JB Eindhoven, The Netherlands
Phone: + 31 40 2577 284
Fax: +31 40 2577 330
emea.securitysystems@bosch.com
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<95% <95% <95% <95%
-25 ºC to +55 ºC
(-13 ºF to +131 ºF)
-40 ºC to +70 ºC
(-40 ºF to +158 ºF)
Asia-Pacific:
Robert Bosch (SEA) Pte Ltd
11 Bishan Street 21
Singapore 573943
Phone: +65 6571 2600
Fax: +65 6571 2698
apr.securitysystems@bosch.com
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-25 ºC to +55 ºC
(-13 ºF to +131 ºF)
-40 ºC to +70 ºC
(-40 ºF to +158 ºF)
Represented by
-25 ºC to +55 ºC
(-13 ºF to +131 ºF)
-40 ºC to +70 ºC
(-40 ºF to +158 ºF)
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