Communications Systems | LBC 3941/11 Sound Projector
LBC 3941/11 Sound Projector
www.boschsecurity.com
The LBC 3941/11 is a 6 W cost-effective sound
projector. It features a very wide opening angle and
unobtrusive styling. Water and dust protection to IP 65
make it suitable for indoor and outdoor use.
Functions
The sound projector features a very wide opening
angle (90 degrees) which means fewer units are
required to cover a given area. Its wide frequency
range also results in better speech and music
reproduction, while the directivity ensures that the
sound is accurately projected to where it is needed
most.
The LBC 3941/11 sound projector is finished in an
attractive white color, and its unobtrusive appearance
complements today’s interior lighting. The color and
styling of the front grille matches an existing Bosch
ceiling loudspeaker (LBC 3951/11).
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
u
Excellent speech and music reproduction
u
Very wide opening angle
u
Modern unobtrusive styling
u
Simple power setting
u
Splash – waterproof
their 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.
The enclosures are made from high-impact selfextinguishing ABS (according to class UL 94 V0).
Safety
acc. to EN 60065
Water and dust protection
acc. to EN 60529, IP 65
Self-Extinguishing
acc. to UL 94 V0
Region
Certification
Europe
CE
Installation/configuration notes
The sound projector is supplied with a steel mounting
bracket painted in white. The bracket has three 10 mm
holes, which can be used to easily mount the projector
to walls and ceilings. The direction of the projector
can be adjusted by means of two screws covered with
white plastic covers. The unit is supplied with a 2 m
color-coded five-core cable, with each color connected
to a different primary tap on the matching
2 | LBC 3941/11 Sound Projector
transformer. This makes it easy to select full-power,
half-power, quarter-power and eighth-power radiation
without opening the unit during installation.
4Ω
Circuit diagram
Polar diagram (measured with pink noise)
Dimensions in mm (in)
125
Hz
250
Hz
500
Hz
1
kHz
2
kHz
4
kHz
8
kHz
SPL 1.1
82
84
83
88
92
88
88
SPL
max.
90
92
91
96
10
0
96
96
Q-factor
1.2
1.2
1.6
2.9
5.1
8.5
18
Efficien
cy
0.17
0.26
0.16
0.2
8
0.3
9
0.0
9
0.0
4
H. angle
360
360
360
18
0
12
0
90
60
V. angle
360
360
360
18
0
12
0
90
60
Acoustical performance specified per octave
Technical specifications
Electrical*
Frequency response
Maximum power
9W
Rated power
6 / 3 / 1.5 / 0.75 W
Sound pressure level
at 6 W / 1 W (1 kHz, 1 m)
96 dB / 88 dB (SPL)
Sound pressure level
at 6 W / 1 W (2 kHz, 1 m)
100 dB / 92 dB (SPL)
Opening angle
at 1 kHz / 4 kHz (-6 dB)
180° / 90°
Effective frequency range (-10
dB)
130 Hz to 18 kHz
Rated voltage
100 V
3 | LBC 3941/11 Sound Projector
Rated impedance
1667 ohm
Connection
2 m 5-wire cable
* Technical performance data acc. to IEC 60268-5
Mechanical
Dimensions (D x L)
165 x 200 mm
(6.50 x 7.87 in)
Speaker diameter
100 mm (4 in)
Weight
1.5 kg (3.3 lb)
Color
White (RAL 9010)
Magnet weight
101 g (3.57 oz)
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
<95%
Ordering information
LBC 3941/11 Sound Projector
Sound projector 6 W, white ABS enclosure, wide
opening angle, water and dust protected IP65, fixed
2 m connection cable.
Order number LBC3941/11
Represented by:
Americas:
Bosch Security Systems, Inc.
12000 Portland Avenue South
Burnsville MN 55337, USA
Phone: +1-800-392-3497
Fax: +1-800-955-6831
audiosupport@us.bosch.com
www.boschsecurity.com
Europe, Middle East, Africa:
Bosch Security Systems B.V.
P.O. Box 80002
5617 BA Eindhoven, The Netherlands
Phone: + 31 40 2577 284
Fax: +31 40 2577 330
emea.securitysystems@bosch.com
www.boschsecurity.com
© Bosch Security Systems 2015 | Data subject to change without notice
1927569803 | en, V5, 01. Jul 2015
Asia-Pacific:
Robert Bosch (SEA) Pte Ltd, Security
Systems
11 Bishan Street 21
Singapore 573943
Phone: +65 6571 2808
Fax: +65 6571 2699
apr.securitysystems@bosch.com
www.boschsecurity.asia
China:
America Latina:
Bosch (Shanghai) Security Systems Ltd. Robert Bosch Ltda Security Systems Division
201 Building, No. 333 Fuquan Road
Via Anhanguera, Km 98
North IBP
CEP 13065-900
Changning District, Shanghai
Campinas, Sao Paulo, Brazil
200335 China
Phone: +55 19 2103 2860
Phone +86 21 22181111
Fax: +55 19 2103 2862
Fax: +86 21 22182398
latam.boschsecurity@bosch.com
www.boschsecurity.com.cn
www.boschsecurity.com
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