Bosch LBC3481-12-US Specsheet

Communications Systems | LBC 34xx/12 Horn Loudspeakers

LBC 34xx/12 Horn Loudspeakers

www.boschsecurity.com

u High efficiency drivers

u Up to 45 W (max. power)

u Wide opening angle

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.

u Excellent speech reproduction

u Simple power setting

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 extreme conditions, leading to

| LBC 34xx/12 Horn Loudspeakers

2

higher customer satisfaction, longer operating life, and
much less chance of failure or performance
deterioration.

Safety acc. to EN 60065

Self-extinguishing acc. to UL 94 V0

Water and dust protection acc. to EN 60529‑IP65

Region Certification

Europe CE Declaration of Conformity

CE

Installation/configuration notes

LBC 3481/12

Polar diagram (measured with pink noise)

Dimensions in mm (in)

Circuit diagram

125Hz250Hz500Hz1

SPL 1.1 - - 94 10310598 86

SPL
max.

Q-factor - - 1.7 3.5 7.8 25.752.

Efficiency- - 1.82 7.085.130.310.0

H. angle - - 180 16095 50 30

V. angle - - 180 16095 50 30

- - 104 11311510896

kHz2kHz4kHz8kHz

5

1

Acoustical performance specified per octave

LBC 3491/12

Frequency response

Dimensions in mm (in)

| LBC 34xx/12 Horn Loudspeakers

3

Circuit diagram

Frequency response

125Hz250Hz500Hz1

kHz2kHz4kHz8kHz

Polar diagram vertical (measured with pink noise)

SPL 1.1 - - 99 10811110697

SPL
max.

Q-factor - - 2.7 6.5 15.840.775.

Efficiency- - 3.72 12.310 1.230.0

H. angle - - 180 90 55 40 30

V. angle - - 180 13080 45 15

- - 109 11812111610
7

9

8

Acoustical performance specified per octave

Polar diagram horizontal (measured with pink noise)