Bosch LS1-UC20E-1-US Specsheet
Communications Systems | LS1‑UC20E‑1 Pendant Sphere Loudspeaker
LS1‑UC20E‑1 Pendant Sphere Loudspeaker
www.boschsecurity.com
u Superb speech and music reproduction
u 5 m connection cable
u Provision for optional safety cord
Sound spheres are pendant sound projectors designed
to be suspended from the ceiling by their connecting
cables. Their excellent sound spread makes them ideal
for use in buildings with high ceilings, such as
hypermarkets and superstores.
The LS1‑UC20E‑1 is a powerful 20 W pendant sphere
loudspeaker, intended for high quality speech and
music reproduction. The state‑of‑the‑art design is
matched to both modern and traditional style
environments. The loudspeaker is suitable for use in
voice evacuation systems.
Functions
Voice Alarm Loudspeaker
Voice alarm loudspeakers are specifically designed for
use in buildings where performance of systems for
verbal communication announcements is governed by
regulations. The LS1‑UC20E‑1 is designed for use in
voice alarm systems and is EN 54‑24 certified and
compliant with BS 5839‑8 and EN 60849.
The loudspeaker has built‑in protection to ensure that,
in the event of a fire, damage to the loudspeaker does
not result in failure of the circuit to which it is
connected. In this way, system integrity is maintained;
ensuring loudspeakers in other areas can still be used
u Water and dust protected to IP 65
u EN 54‑24 certified
to inform people of the situation. The loudspeaker is
supplied with a ceramic terminal block and thermal
fuse.
Superb Sound Quality
The use of a high‑quality driver has resulted in a very
natural sound reproduction with excellent bass
response.
Certifications and approvals
All Bosch loudspeakers are designed to withstand
operating at their rated power for 100 continuous
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
improved reliability under extreme conditions, leading
to higher customer satisfaction, longer operating life,
and lessons the chance of failure or performance
deterioration.
Ø 185 56
254
14
16
41
1.4
3 x 6 (0.24)
Ø
(0.55)
(1.61)
(7.28) (2.20)
(10.00)
(1.61)
(0.63)
0
20W
10W
5W
2.5W
8
2 | LS1‑UC20E‑1 Pendant Sphere Loudspeaker
Safety Aspects
In common with all Bosch products, care is taken to
meet high safety standards. All ABS parts are selfextinguishing (according to UL 94 V 0). This sound
projector complies with the relevant safety and
installation regulations of EN 60065.
Water and dust protection according to IEC 60529, IP 65
Emergency according to EN 54‑24 / BS 5839‑8 /
EN 60849
Region Certification
Europe CE
CE DOP
CPD
Installation/configuration notes
Mounting
The loudspeaker is suspended from the ceiling via its
five meter, five‑core connecting cable, which is easy to
shorten for the desired height. For optional safety, a
steel safety cord can be attached.
Power Setting
The loudspeaker is supplied with a five meter colorcoded, five‑core connecting cable with each color
connected to a different primary tap on the 100 V
matching transformer. This allows nominal full‑power,
half‑power, quarter‑power or eighth‑power radiation to
be selected (in 3 dB steps).
Frequency response
Polar diagram (measured with pink noise)
Octave band sensitivity*
Octave SPL
1W/1m
Total octave
SPL
1W/1m
Total octave
SPL
Pmax/1m
Dimensions in mm / (in)
Circuit diagram
125 Hz 84.1 - -
250 Hz 84.7 - -
500 Hz 84.3 - -
1000 Hz 85.3 - -
2000 Hz 88.3 - -
4000 Hz 90.7 - -
8000 Hz 90.7 - -
A-weighted - 87.4 99.3
Lin-weighted - 89.4 101.0
Octave band opening angles
Horizontal Vertical
125 Hz 360 360
250 Hz 360 360
500 Hz 360 360
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