Bosch LC4-UC24E, LC4-UC12E, LC4-UC06E Specsheet
Communications Systems | LC4 Ceiling Loudspeaker Range
LC4 Ceiling Loudspeaker Range
www.boschsecurity.com
u Innovative CosCone full range driver
u Excellent speech and music reproduction
u Unrivalled opening angle for all octave frequencies
The LC4 Ceiling Loudspeaker Range can be used for a
wide variety of ceiling environments. They provide
excellent speech and music in indoor public address
applications. New CosCone driver technology, used in
this range, stands for delivering outstanding sound
quality from a small sized unit.
It ensures a wide and equal spread of all octave
frequencies and eliminates high‑frequency beaming.
Fewer loudspeakers are needed to cover a given area,
and the noticeable “fading” that can occur as a
listener walks from one loudspeaker to another area is
eliminated.
The LC4‑UCxxE ceiling loudspeaker is a light and
compact unit with an unobtrusive, neutral designed
front grille. The range offers a choice of three
loudspeakers distinguished by input power of: 6 W,
12 W and 24 W with the same wide opening angle,
ensuring a wide and equal spread of the important
frequency octaves for speech intelligibility and music
clarity. The LC4 range also includes a back‑box and
metal fire‑dome.
u Paintable grille
u EN 54‑24, UL2043, UL1480 certified
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
higher customer satisfaction, longer operating life, and
much less chance of failure or performance
deterioration.
The LC4 range has UL1480F certification listed for use
in Fire Alarm and/or Emergency Communication
Systems.
Safety According to EN 60065
Water and dust
According to EN 60529 IP 21
protected *
Emergency * According to BS 5839 part 8
According to EN 54‑24
* With LC4‑CBB back‑box or LC4‑MFD fire‑dome
2 x 20.5 mm / 0.80"
95 mm / 3.74"
70 mm / 2.75"
17 mm / 0.66"
162 mm / 6.37"
200 mm / 7.87"
2 x 20.5 mm / 0.80"
2 x 11.5 mm / 0.45"
| LC4 Ceiling Loudspeaker Range
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Region Certification
Europe DOP
CE
CPD
USA UL
Installation/configuration notes
The LC4 range is very installation friendly. A cutting
template is supplied with each unit, and the
loudspeaker is secured in ceilings up to 50 mm (2 in)
thick using two integral screw driven clamps.
Connections are made using a screw terminal block on
the frame, where each incoming and outgoing
conductor of the same potential can be connected to a
separate screw on a terminal block.
Power tapping on both 70 V and 100 V allows
selection of full‑power, half‑power, quarter‑power,
eight‑power radiation and 8 Ohm.
A selector at the front of the frame simplifies the
required selection of the power setting.
The loudspeaker grille, standard supplied, can be
secured to the loudspeaker unit with a quick bayonet
fitting after installation of the loudspeaker into the
ceiling.
Mechanical diagram LC4‑UCxxE and LC4‑CBB
The optional back‑box (LC4‑CBB), protects the rear of
the loudspeaker from dust, falling objects, makes the
unit vermin proof and prevents sound traveling via the
ceiling cavity to adjacent areas.
The back‑box is assembled with the loudspeaker by
means of a snap‑in construction and has knock‑out
holes for two grommets (11.5 mm) and for two cable
glands (20.5 mm) aside and on the top.
Ease of installation for individual loudspeaker and
loudspeaker / fire‑dome combinations. The metal
fire‑dome (LC4‑MFD) mounting is fixed in the ceiling
prior to the ceiling speaker mounting. The fire‑dome is
provided with a safety cord allowing the installer to
temporarily hang the loudspeaker in the fire‑dome,
while connecting. Connections are made using an
innovative ceramic screw terminal connector on top of
the metal fire‑dome with loop‑through facility.
The loudspeaker has a provision also for adding a
capacitor in case the loudspeaker is used in systems
Rear view LC4‑UCxxE including LC4‑CBB
with DC supervision.
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| LC4 Ceiling Loudspeaker Range
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Rear view LC4-UCxxE including LC4-MFD, showing the
ceramic connector
LC4 ceiling loudspeaker range overview
Circuit diagram LC4‑UCxxE
Frequency response LC4‑UCxxE
LC4‑UCxxE horizontal/vertical polar diagram (low
frequency). Normalized at 0-degrees axis.
LC4‑UCxxE horizontal/vertical polar diagram (low
frequency). Normalized at 0-degrees axis.
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