Bosch LC4-UC12E Ceiling Loudspeaker (12W, White)

BH #BOLC4UC12E • MFR #F.01U.217.141
Bosch LC4-UC12E Ceiling Loudspeaker (12W, White)
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Expected availability: 7-14 business days

Important Notice

  • This item is noncancelable and nonreturnable.
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Bosch LC4-UC12E Overview

The 12W white LC4-UC12E Ceiling Loudspeaker from Bosch can be used for a wide variety of ceiling environments. It provides speech and music in indoor public address applications. The CosCone driver technology, used in this loudspeaker, 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.

Only a few 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. It is a light and compact unit with an unobtrusive, neutral designed front grille.

This 12W loudspeaker comes with a wide opening angle, ensuring a wide and equal spread of the important frequency octaves for speech intelligibility and music clarity. It also includes a back-box and metal fire-dome. This installation-friendly unit comes with a cutting template, and is secured in ceilings up to 2” (50mm) thick using 2 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 70V and 100V allows selection of full-power, half-power, quarter-power, eight-power radiation, and 8Ω. 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.

The included 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 2 grommets 0.4” (11.5mm) and for 2 cable glands 0.8” (20.5mm) aside and on the top.

You can easily install individual loudspeakers and loudspeakers / fire-dome combinations. The included 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.

Both the loudspeaker and back-box have provision for mounting the line / supervision board (sold separately). The Loudspeaker also has a provision for adding a capacitor (sold separately) in case the loudspeaker is used in systems with DC supervision.

Certifications and Approvals

It is designed to withstand operating at the rated power for 100 hours in accordance with IEC 268-5 PHC (Power Handling Capacity) standards. Bosch has also developed the SAFE (Simulated Acoustical Feedback Exposure) test to demonstrate that the speakers can withstand 2 times their rated power for short durations.

This ensures extra reliability under extreme conditions, leading to great customer satisfaction, long operating life, and less chance of failure or performance deterioration.


Innovative CosCone full range driver
Good speech and music reproduction
Unrivalled opening angle for all octave frequencies
Paintable grille
EN 54-24 and BS5839 compliant
UPC: 800549627801

Bosch LC4-UC12E Specs

Maximum Power18 W
Rated PowerPHC: 12 W, (12 / 6 / 3 / 1.5 W)
Sound PressureLevel: At 6 W / 1 W (1 kHz, 3.2' (1.0 m)): 98 dB / 87 dB (SPL)
Frequency RangeEffective (-10 dB): 65 Hz to 20 kHz
OpeningAngle: At 1 kHz / 4 kHz (-6 dB): 180° / 180°
Input VoltageRated: 9.8 / 70 / 100 V
ImpedanceRated: 8 / 418 / 833 Ω
Connector4-way screw terminal block
SensitivityOctave SPL 1 W/m:
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

Total octave SPL 1 W/m:
A-weighted: 85.9
Lin-weighted: 88.0

Total octave SPL Pmax/m:
A-weighted: 95.1
Lin-weighted: 97.4
AngleHorizontal & Vertical
125 Hz: 180
250 Hz: 180
500 Hz: 180
1000 Hz: 180
2000 Hz: 180
4000 Hz: 180
8000 Hz: 128
Operating Temperature-13 to +131°F (-25 to +55°C)
Storage Temperature-40 to +158°F (-40 to +70°C)
Relative Humidity<95%
Certifications and Approvals
ComplianceAccording to EN 60065
ComplianceEVAC: According to BS 5839 part 8, EN 54-24
Water and Dust ResistanceEVAC: According to EN60529 IP21
CertificationEurope CE
MaterialLoudspeaker Unit: ABS (V 0)
Front Grille: Steel mesh with ABS (V 0) rim
Diameter7.87" (200.00 mm)
MountingCut-Out: 6.38" (162.00 mm)
Ceiling ThicknessMinimum to Maximum: 0.19 to 1.97" (5.00 to 50.00 mm)
Maximum Depth2.75" (70.00 mm)
Weight1.86 lb (840.00 kg)
Diameter6.29" (160.00 mm)
Maximum Depth3.07" (78.00 mm)
MaterialABS (V 0)
Weight0.35 lb (160.00 kg)
Metal Fire-dome
Diameter7.75 / 6.88" (197.00 / 175.00 mm)
Maximum Depth6.14" (156.00 mm)
MountingCut‑Out: 7.00" (178.00 mm)
Ceiling ThicknessMinimum to Maximum: 0.19 to 1.97" (5.00 to 50.00 mm)
Weight2.20 lb (998.00 kg)
Packaging Info
Package Weight2.7 lb
Box Dimensions (LxWxH)9 x 9 x 4.2"
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