Bosch LB1-UM20E-D Specsheet
Communications Systems | LB1‑UMx0E Premium‑sound Cabinet Loudspeaker Range
LB1‑UMx0E Premium‑sound Cabinet
Loudspeaker Range
www.boschsecurity.com
u High-fidelity music and speech reproduction
u Supplied with adjustable wall‑mounting bracket
The Premium‑sound range of cabinets is intended for
clear reproduction of speech, foreground and
background music to be used in general indoor and
outdoor applications. The range comprises two
models, offering a choice of 20 W or 50 W power
handling capacity. The enclosures are made from
aluminum with ABS top and bottom covers and are
available in charcoal (D) and white (L).
Typical applications for these products are: theme
bars, music restaurants, theme parks, retail outlets,
audio visual, boardrooms and offices, exhibition areas
and presentation environments, fitness centre.
Its excellent sound reproduction capability is
attributed the superb to the use of high‑quality driver
components and crossover network design.
A self‑restoring passive element protects the high
frequency driver against incidental overload.
A three‑way ceramic terminal block with screw
connections suitable for loop-through wiring is located
in the compartment in the base of the unit.
An easy to install, sturdy wall mounting bracket is
standard supplied. The same bracket can be used in
combination with the universal floor stand
LBC 1259/00 for temporary installations.
u Self‑restoring overload protection
u Provision for internal mounting of the optional line /
loudspeaker supervision board
u EN 54‑24 certified
All models are supplied with a built‑in 70/100 V
transformer with taps on the primary winding for
full‑power, half‑power, quarter‑power and one‑eighth
power radiation. These taps are connected to a rotary
vari‑tap switch located in the compartment in the base
of the enclosure, to allow simple output power setting.
A low ohmic connection is also provided on the
vari‑tap switch.
Functions
Voice alarm
Voice alarm loudspeakers are specifically designed for
use in buildings, where the performance of Public
Address systems is subject to official regulations. The
LB1‑UMx0E‑x are designed for voice alarm systems,
and are EN 54‑24 certified and compliant with
BS 5839‑8 and EN 60849.
Protection
The loudspeakers have built‑in protection to ensure
that in the event of a fire damage does not cause
failure of the connected circuit. In this way, system
integrity is maintained; ensuring loudspeakers in other
areas can still be used to inform people of the
situation.
274 mm
10.78 in
160 mm
6.29 in
180 mm
7.08 in
280 mm
11.02 in
55 mm (2.17")
7 mm
(0.82")
100 mm (3.94")
2.5W
( )
( )
5W
10W
20W
20W
10W
5W
2.5W
70.7V100V
8 ohms
8 ohms
W
T
C
0
A
B
C
D
E
F
F'
E'
D'
C'
B'
A'
60
70
80
90
100
110
10 100 1000 10000 100000
(Hz)
dB SPL
BOSCH
-3
0
-25
-20
-15
-10
-5
0
5
0
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| LB1‑UMx0E Premium‑sound Cabinet Loudspeaker Range
2
Connections and safety
The loudspeakers have a ceramic terminal block,
thermal fuse, and heat‑resistant, high‑temperature
wiring. The cabinets have a provision for internally
mounting the optional line/loudspeaker supervision
board.
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 the speakers can withstand two
times their rated power for short durations. This
ensures extra reliability under extreme conditions,
leading to greater customer satisfaction, longer
operating life, and much less chance of failure or
performance deterioration.
Safety according to EN 60065
Emergency according to EN 54‑24
according to BS 5839‑8 /
EN 60849
LB1‑UM20E‑D/L
Dimensions
Water and dust protection according to EN 60529 IP 65
Self‑extinguishing ABS according to UL 94 V 0
Wind‑force according to Bft11
Region Certification
Europe CPR
Installation/configuration notes
LB1‑UMx0E‑D/L
Mounting bracket
Circuit diagram
Frequency response
LB1‑UM20E‑D/L
Polar diagram horizontal
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1000 2000 4000 8000
405 mm
15.94 in
160 mm
6.29 in
180 mm
7.08 in
280 mm
11.02 in
55 mm (2.17")
7 mm
(0.82")
100 mm (3.94")
| LB1‑UMx0E Premium‑sound Cabinet Loudspeaker Range
3
Octave band sensitivity *
Polar diagram horizontal
Octave SPL
1W/1m
Total octave
SPL
1W/1m
Total octave
SPL
Pmax/1m
125 Hz 82.5 - -
250 Hz 82.5 - -
500 Hz 85.4 - -
1000 Hz 88.2 - -
2000 Hz 88.0
4000 Hz 85.5 - -
8000 Hz 86.3 - -
A-weighted - 84.1 96.4
Lin-weighted - 85.0 97.4
Octave band opening angles
Horizontal Vertical
125 Hz 360 360
250 Hz 360 360
500 Hz 206 360
Polar diagram vertical
Polar diagram vertical
1000 Hz 174 127
2000 Hz 128 141
4000 Hz 136 141
8000 Hz 132 117
Acoustical performance specified per octave
* (all measurements are done with a pink noise signal;
the values are in dBSPL)
LB1‑UM50E‑D/L
Dimensions
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