Bosch LBC 3951/11 Bedienungsanleitung

Communication | LBC 3951/11 Ceiling Loudspeaker

LBC 3951/11

Ceiling Loudspeaker

• Compact yet powerful

• Very wide opening angle

• Modern unobtrusive styling

• Installation friendly

• Splash - waterproof

• Comply with international

installation and safety regulations

With this loudspeaker, Bosch provides impressive audio

performance at an economical price. The 9 W (maximum

power) ceiling loudspeaker is suitable for indoor public

address installations, particularly in applications with smaller

areas such as hotel rooms, shops, offices and elevators.

Functions

The LBC 3951/11 has a perforated metal grille with a plastic

surround, finished in an attractive off-white RAL color. The

unobtrusive styling of this loudspeaker complements today’s

interior lighting.

The loudspeaker feature a very wide opening angle, which

means fewer units are required to cover a given area. The wide

frequency range means better speech and music reproduction.

The unit is supplied with a 100 V matching transformer with

taps on the primary winding for full-power, half-power,

quarter-power and eighth-power radiation.

The loudspeaker (with special treated paper cone), is IPx4

water protected from the front and can be applied in humidity

environments for example bathrooms, sauna’s, atriums and

swimming pool areas.

Parts Included

Certifications and Approvals

All plastic parts are manufactured from self-extinguishing

high-impact ABS material (according to UL 94V0

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.

Quantity Component

1 LBC 3951/11 Ceiling Loudspeaker

Safety EN 60065

Water Protected Acc. To EN 60529 IP x 4

2 | LBC 3951/11 Ceiling Loudspeaker

Installation/Configuration Notes

Installation is made easy with integral clips that securely hold

the ceiling loudspeaker in its cut-out. Ceilings from 9 to 25

mm thick can be accommodated. A template is also provided

for accurately marking the cutout in ceiling panels. Wiring is

via a connection block with push-type terminals, making

installation possible without using any special tools. The

terminal blocks have provision for loop-through wiring. The

transformer is delivered wired for 6 W rated output power, but

can easily be changed for other connections using the color-

coded wires and terminal block.

Dimensions in mm (inch)

Circuit diagram

Frequency response

Polar diagram

Quick reference table

01 Clamp

02 Matching Transformer

03 Terminal Block

Octave

band (Hz)

125 250 500 1k 2k 4k 8k

SPL 1.1 87 87 85 88 89 89 86

SPL max. 95 95 93 96 97 97 94

Q-factor 4 5.6 2.2 3.2 4.6 10.7 19

Efficiency 0.16 0.11 0.18 0.25 0.22 0.09 0.03

H. angle 180 180 180 17 0 160 80 60

V. angle 180 18 0 180 17 0 160 80 60

LBC 3951/11 Ceiling Loudspeaker | 3

*) Technical performance data acc. to IEC 60268-5

Technical Specifications

Electrical*

Max. Power 9 W

Rated Power (PHC) 6 W (6 - 3 - 1.5 - 0.75 W)

Sound Pressure Level at 6 W/1 W

(at 1 kHz, 1 m) 96 / 88 dB (SPL)

Effective Frequency Range 60 Hz to 18 kHz (-10 dB)

Opening Angle 170° / 80°(at 1 kHz/4 kHz, -6 dB)

Rated Voltage 100 V

Rated Impedance 1667 ohm

Mechanical

Speaker Size 101.6 mm (4 in )

Magnet Weight 3.57 oz

Connection 2-pole push connector

Dimensions

Diameter 160 mm (6.30 inch)

Max. Depth 95 mm (3.74 inch)

Ceiling Thickness 9 to 25 mm (0.35 to 0.98 inch)

Mounting Cut-Out 145 mm (5.71 inch)

Color Off-white (RAL 9010)

Weight 670 g (1.47 lb)

Environmental

Ambient Temperature -25°C to +55°C (-13°Fto 131°F)

Ordering Information

Model & Description

LBC 3951/11 Ceiling Loudspeaker

LBC 1256/00 EVAC Connection Adapter

3-pole screw connector

4 | LBC 3951/11 Ceiling Loudspeaker

Data subject to change without notice | Printed in The Netherlands | 21. Jun 2005

Americas:

Bosch Security Systems

130 Perinton Parkway

Fairport, New York, 14450, USA

Phone:+1 (0) 585 223 4060

Fax:+1 (0) 585 223 9180

[email protected]

http://www.boschsecurity.us

Europe, Middle East, Africa:

Bosch Security Systems B.V.

P.O. Box 80002

5600 JB Eindhoven, The Netherlands

Phone:+31 (0) 40 27 83955

Fax:+31 (0) 40 27 86668

[email protected]

http://www.boschsecurity.com

Asia-Pacific:

Bosch Security Systems Pte Ltd

38C Jalan Pemimpin

Singapore 577180

Phone:+65 6319 3450

Fax:+65 6319 3499

[email protected]

http://www.boschsecurity.com

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