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

2

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.

+

0

0

1/8

1/81/4

1

1/2

1/41/2

1

100V

70V

88

+

8

60

70

80

90

100

110

10 100 1000 1000 0 1000 00

Freq uency

dB SPL

BOSCH

-30

-25

-20

-15

-10

-5

0

5

0

10

20

30

40

50

60

70

80

90

100

110

120

130

140

150

160

170

180

190

200

210

220

230

240

250

260

270

280

290

300

310

320

330

340

350

125 250 500 1000

1000 2000 4000 8000

-30

-25

-20

-15

-10

-5

0

5

0

10

20

30

40

50

60

70

80

90

100

110

120

130

140

150

160

170190

200

210

220

230

240

250

260

270

280

290

300

310

320

330

340

350

| LC4 Ceiling Loudspeaker Range

3

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.

4 | LC4 Ceiling Loudspeaker Range

Octave band sensitivity LC4‑UC06E *

Octave SPL

1W/1m

125 Hz 85.9 - -

250 Hz 83.5 - -

500 Hz 86.1 - -

1000 Hz 86.6 - -

2000 Hz 89.4

4000 Hz 90.1 - -

8000 Hz 91.1 - -

A-weighted - 86.4 93.5

Lin-weighted - 88.2 95.4

Octave band sensitivity LC4‑UC12E *

Octave SPL

1W/1m

125 Hz 85.9 - -

250 Hz 83.7 - -

500 Hz 86.1 - -

1000 Hz 86.8 - -

2000 Hz 89.4

4000 Hz 88.5 - -

8000 Hz 90.5 - -

A-weighted - 85.9 95.1

Lin-weighted - 88.0 97.4

Octave band sensitivity LC4‑UC24E *

Octave SPL

1W/1m

125 Hz 86.3 - -

250 Hz 83.3 - -

500 Hz 86.0 - -

1000 Hz 86.5 - -

2000 Hz 88.9

4000 Hz 88.3 - -

8000 Hz 89.3 - -

Total octave
SPL
1W/1m

Total octave
SPL
1W/1m

Total octave
SPL
1W/1m

Total octave
SPL
Pmax/1m

Total octave
SPL
Pmax/1m

Total octave
SPL
Pmax/1m

A-weighted - 85.6 97.7

Lin-weighted - 87.6 100.4

Octave band opening angles LC4‑UCxxE *

Horizontal Vertical

125 Hz 180 180

250 Hz 180 180

500 Hz 180 180

1000 Hz 180 180

2000 Hz 160** / 180 160** / 180

4000 Hz 80** / 180 80** / 180

8000 Hz 128 128

Acoustical performance specified per octave

(all measurements are done with a pink noise signal;
the values are in dBSPL)
** With mounted LC4-CBB or LC4-MFD

Parts included

Quantity Component

1 LC4‑UCxxE Ceiling Loudspeaker

1 Installation Instruction

1 Ceiling cut‑out template

Technical specifications

Electrical *

LC4‑UC06E LC4‑UC12E

Description Ceiling loudspeaker

Maximum power 9 W 18 W

Rated power 6 W

(6/3/1.5/0.75W)

Sound pressure level
at 6 W power / 1 W
(1 kHz, 1 m)

Sound pressure level at
rated power / 1 W
(1 kHz, 4 m)
(reference axis 0
degrees, free field)

Opening angle
at 1 kHz / 4kHz (-6 dB)

Effective frequency
range
(-10 dB)

95 dB / 87 dB (SPL) 98 dB / 87 dB

84 dB / 75 dB (SPL) 86 dB / 75 dB

180° / 180° ** 180° / 180° **

65 Hz to 20 kHz 65 Hz to 20 kHz

12 W
(12/6/3/1.5W)

(SPL)

(SPL)

5 | LC4 Ceiling Loudspeaker Range

Rated input voltage

6.93 V 70 V 100 V

LC4‑UC06E

Rated impedance
LC4‑UC06E

6 W 8 Ohm 835

Ohm

3 W N/A 1667

Ohm

1.5 W N/A 3333
Ohm

0.75 WN/A 6667
Ohm

Rated input voltage

9.8 V 70 V 100 V

LC4‑UC12E

Rated impedance
LC4‑UC12E

12 W 8 Ohm 418

Ohm

6 W N/A 833

Ohm

3 W N/A 1667

Ohm

1.5 W N/A 3333
Ohm

Electrical connection 4‑way screw terminal block

Acceptable wire gauge 0.5 – 3 mm

2

1667
Ohm

3333
Ohm

6667
Ohm

13333
Ohm

833
Ohm

1667
Ohm

3333
Ohm

6667
Ohm

6 W N/A 833

Ohm

3 W N/A 1667

Ohm

1667
Ohm

3333
Ohm

Electrical connection 4-way screw terminal block

Acceptable wire gauge 0.5 – 3 mm

2

* Technical performance according to IEC 60268‑5
** With mounted LC4-CBB or LC4-MFD: 80° @4 kHz

Mechanical

LC4‑UC06E LC4‑UC12E LC4‑UC24E

Description Ceiling Loudspeaker

Diameter 200 mm (7.87 in)

Mounting cut‑out 162 mm (6.38 in)

Min./Max. ceiling

5 to 50 mm (0.19 to 1.97 in)

thickness

Maximum depth 70 mm (2.75 in)

Material

ABS (V 0)
(Loudspeaker
unit)

Material (front

Steel mesh with ABS (V 0) rim

grille)

LC4‑UC24E

Description Ceiling loudspeaker

Maximum power 36 W

Rated power 24 W (24/12/6/3 W)

Sound pressure level

101 dB / 87 dB (SPL)
at 6 W power / 1 W
(1 kHz, 1 m)

Sound pressure level

88 dB / 75 dB (SPL)
at rated power / 1 W
(1 kHz, 4 m)
(reference axis 0
degrees, free field)

Opening angle

180° / 180° **
at 1 kHz / 4kHz (-6 dB)

Effective frequency

65 Hz to 20 kHz
range
(-10 dB)

Rated input voltage

13.9 V 70 V 100 V

LC4‑UC24E

Rated impedance

24 W 8 Ohm 208
LC4‑UC24E

Ohm

416
Ohm

Weight 800 g

(1.77 lb)

Color

840 g
(1.86 lb)

Black (RAL 9011)

990 g
(2.18 lb)

(loudspeaker
unit)

Color (front

White (RAL 9003)

grille)

LC4‑CBB LC4‑MFD

Description Back‑Box Metal Fire‑dome

Diameter 160 mm (6.29 in) 197 / 175 mm (7.75 /

6.88 in)

Maximum depth 78 mm (3.07 in) 156 mm (6.14 in)

Mounting cut‑out n.a. 178 mm (7.00 in)

Min./Max. ceiling
thickness

n.a. 5 to 50 mm (0.19 to

1.97 in)

Material ABS (V 0) Steel

Weight 160 g (0.35 lb) 998 g (2.20 lb)

Color Black

Flame red (RAL 3000)

(RAL 9011)

12 W N/A 416

Ohm

833
Ohm

6 | LC4 Ceiling Loudspeaker Range

Environmental

Operating temperature -25 ºC to +55 ºC (-13 ºF to +131 ºF)

Storage and operating
temperature

Relative humidity <95%

-40 ºC to +70 ºC (-40 ºF to +158 ºF)

Note:

• The specification data is measured in an anechoic
chamber, on a standard baffle

• The reference axis is perpendicular to the center
point of the front grille

• The reference plane is perpendicular to the center of
the reference axis

• The horizontal plane is perpendicular to the center of
the reference plane

Accessories

LC4‑CBB Back‑box

Back box for mounting onto the LC4 loudspeaker,
protects the rear of the loudspeaker from dust and
dripping water, makes the unit vermin proof, and
prevents sound traveling via the ceiling cavity to
adjacent areas, EN 54-24 certified, black RAL 9011.

Order number LC4-CBB

LC4‑MFD Metal Fire‑dome

Metal fire dome for use with LC4 ceiling loudspeakers,
includes ceramic terminal connector with cable loop­through facility, EN54-24 certified, flame red
RAL 3000.

Order number LC4-MFD

Ordering information

LC4‑UC06E Ceiling Loudspeaker 6 W

Ceiling loudspeaker 6 W, wide-opening angle for all
octave frequencies, separate ABS grille with metal
grille, two screw-driven clamp ceiling mounting,
EN54-24 certified, white RAL 9003.

Order number LC4-UC06E

LC4‑UC12E Ceiling Loudspeaker 12 W

Ceiling loudspeaker 12 W, wide-opening angle for all
octave frequencies, separate ABS grille with metal
grille, two screw-driven clamp ceiling mounting,
EN54-24 certified, white RAL 9003.

Order number LC4-UC12E

LC4‑UC24E Ceiling Loudspeaker 24 W

Ceiling loudspeaker 24 W, wide-opening angle for all
octave frequencies, separate ABS grille with metal
grille, two screw-driven clamp ceiling mounting,
EN54-24 certified, white RAL 9003.

Order number LC4-UC24E

7 | LC4 Ceiling Loudspeaker Range

Represented by:

Europe, Middle East, Africa: Germany: North America: Asia-Pacific:

Bosch Security Systems B.V.
P.O. Box 80002
5600 JB Eindhoven, The Netherlands
Phone: + 31 40 2577 284
[e-mail]
emea.boschsecurity.com

Bosch Sicherheitssysteme GmbH
Robert-Bosch-Ring 5
85630 Grasbrunn
Germany
www.boschsecurity.com

Bosch Security Systems, Inc.
130 Perinton Parkway
Fairport, New York, 14450, USA
Phone: [phone]
Fax: [phone]
[e-mail]
www.boschsecurity.us

Robert Bosch (SEA) Pte Ltd, Security Systems
11 Bishan Street 21
Singapore 573943
Phone: [phone]
Fax: [phone]
[e-mail]
www.boschsecurity.asia

© Bosch Security Systems 2017 | Data subject to change without notice
1927276299 | en, V14, 30. Jan 2017