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
u Paintable grille
u EN 54 24, UL2043, UL1480 certified
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.
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 |
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Water and dust |
According to EN 60529 IP 21 |
protected * |
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Emergency * |
According to BS 5839 part 8 |
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According to EN 54 24 |
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* With LC4 CBB back box or LC4 MFD fire dome
2 | LC4 Ceiling Loudspeaker Range
Region |
Certification |
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Europe |
DOP |
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CE |
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CPD |
USA |
UL |
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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.
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 with DC supervision.
/ 3.74" |
2.75" |
0.66" |
95 MM |
70 MM / |
17 MM / |
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162 MM / 6.37" |
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200 MM / 7.87" |
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2 X 11.5 MM / 0.45" |
2 X 20.5 MM / 0.80"
2 X 20.5 MM / 0.80"
Mechanical diagram LC4 UCxxE and LC4 CBB
Rear view LC4 UCxxE including LC4 CBB
3 | LC4 Ceiling Loudspeaker Range
Rear view LC4-UCxxE including LC4-MFD, showing the ceramic connector
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8 |
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1/8 |
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+ |
1/4 |
1/8 |
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1/2 |
1/4 |
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+ |
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0 |
1 |
1/2 |
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8 |
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0 |
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1 |
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100V |
70V |
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Circuit diagram LC4 UCxxE
SPL |
110 |
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BOSCH |
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dB |
10 0 |
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9 0 |
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8 0 |
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7 0 |
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6 0 |
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10 |
10 0 |
100 0 |
10 00 0 |
10 0 00 0 |
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Frequency |
Frequency response LC4 UCxxE
LC4 ceiling loudspeaker range overview
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0 |
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350 |
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10 |
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340 |
5 |
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20 |
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330 |
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30 |
320 |
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0 |
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40 |
310 |
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-5 |
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50 |
300 |
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-10 |
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60 |
290 |
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-15 |
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70 |
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-20 |
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280 |
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80 |
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-25 |
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270 |
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90 |
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-30 |
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260 |
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100 |
250 |
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110 |
240 |
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120 |
230 |
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130 |
220 |
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140 |
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210 |
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150 |
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200 |
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160 |
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190 |
180 |
170 |
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125 |
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250 |
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500 |
1000 |
LC4 UCxxE horizontal/vertical polar diagram (low frequency). Normalized at 0-degrees axis.
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0 |
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350 |
10 |
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340 |
5 |
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20 |
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330 |
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30 |
320 |
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0 |
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40 |
310 |
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-5 |
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50 |
300 |
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-10 |
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60 |
290 |
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-15 |
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70 |
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-20 |
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280 |
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80 |
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-25 |
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270 |
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90 |
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-30 |
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260 |
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100 |
250 |
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110 |
240 |
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120 |
230 |
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130 |
220 |
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140 |
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210 |
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150 |
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200 |
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160 |
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190 |
170 |
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1000 |
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2000 |
4000 |
8000 |
LC4 UCxxE horizontal/vertical polar diagram (low frequency). Normalized at 0-degrees axis.
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