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
www.boschsecurity.com
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)
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