This ceiling loudspeaker is suitable for speech and music reproduction in various indoor spaces. It has a 6W dual-cone driver and matching transformer, mounts flush in ceilings from 9-25mm thick, and can be fitted with an optional fire dome. It offers high sound pressure levels across a wide frequency range in an unobtrusive design.

1. Communication | LBC 3090/31 Ceiling Loudspeaker
LBC 3090/31
Ceiling Loudspeaker
• Suitable for speech and music reproduction
• Increased sensitivity
• Flush-mounting in ceiling cavity
• Easy to install
• Simple power setting
• Protective dust cover
• Optional certified fire dome
• Unobtrusive in virtually all interiors
• Ball-proof
• Complies with international installation and
safety regulations
• Bosch loudspeakers offer a combination of
quality, performance and innovation in public
address. They are the result of over half a
century’s experience in professional audio,
and meet virtually all sound reinforcement
system requirements.
Functions Certifications and Approvals
A flush-mounting ceiling loudspeaker is available for general All Bosch loudspeakers are designed to withstand operating at
purpose applications. This full-range loudspeaker offers a their rated power for 100 hours in accordance with IEC 268-5
high sound pressure level and a wide frequency range, and is Power Handling Capacity (PHC) standards. Bosch has also
suitable for both speech and music reproduction in shops, developed the Simulated Acoustical Feedback Exposure
department stores, schools, offices, sports halls, hotels and (SAFE) test to demonstrate that they can withstand two times
restaurants. their rated power for short durations. This ensures extra
The loudspeaker assembly consists of a single-piece, 6 W dual- reliability under extreme conditions, leading to higher
cone loudspeaker and frame, with a 100 V matching customer satisfaction, longer operating life, and much less
transformer mounted on the back. A circular metal grille is chance of failure or performance deterioration.
integrated with the front. The appearance and neutral white
colour have been selected to be unobtrusive in virtually all Safety EN 60065
interiors. A dust cover protects the rear. Ballproof acc. to DIN 18032-3
Parts Included
Quantity Component
1 LBC 3090/31 Ceiling Loudspeaker
1 172 mm Circular Template

2. 2 | LBC 3090/31 Ceiling Loudspeaker
Installation/Configuration Notes
Installation
The assembly can be simply and quickly installed into a hole in
the ceiling cavity and secured by two integral spring-loaded
ceiling locking clamps (for ceilings and wall boards from 9 to 25
mm thick). A circular template for marking a 172 mm (6.7 in)
diameter hole is included with the loudspeaker.
Terminal Block
Frequency response
The unit has a two-way terminal block with push connections
suitable for loop-through wiring. Three primary taps are provided
on the matching transformer to allow selection of nominal full-
power, half-power or quarter-power radiation (i.e. in 3 dB steps).
LBC 3080/01 Fire Dome
During a fire, the ceiling cavity can allow fire or smoke to spread
throughout a building. To inhibit fire entering the cavity via the
ceiling loudspeaker, it can be fitted with an LBC 3080/01 steel
fire dome. This is mounted on the loudspeaker assembly using
four self-tapping screws supplied with the fire dome. The fire-
dome has knock-out holes for two grommets (supplied) and two
cable glands (PG 13).
Polar diagram (measured with pink noise)
Octave 125 250 500 1k 2k 4k 8k
band (Hz)
Dimensions
SPL 1.1 94 91 88 91 93 96 92
SPL max. 102 99 96 99 101 104 100
Q-factor 4.8 5 3 3.4 6.3 18 20
Efficiency 0.66 0.32 0.27 0.47 0.4 0.28 0.1
Hor. angle 150 140 180 160 140 55 45
Vert. angle 150 140 180 160 140 55 45
Circuit diagram
Quick reference table

3. LBC 3090/31 Ceiling Loudspeaker | 3
LBC 3080/01 Fire Dome Technical Specifications
Electrical*
Max. Power 9W
Rated Power (PHC) 6 W (6 - 3 - 1.5 W)
Sound pressure level at 99 dB/91 dB (SPL)
6 W/1 W (at 1 kHz, 1 m)
Effective frequency range 70 Hz to 18 kHz
(-10 dB)
Opening angle 160° / 55°
(at 1 kHz/4 kHz, -6 dB)
Rated Voltage 100 V
Rated Impedance 1667 ohm
Mechanical
Speaker Size 152.4 mm (6 inch)
Magnet Weight 0.15 kg (5.3 oz)
Connection 2-pole push connector
Dimensions 199 x 89 mm
(dia x max. depth) (7.8 x 3.5 inch)
Mounting Cut-Out Dia. 172 mm (6.5 inch)
Color White (RAL 9010)
LBC 3080/01 Weight 990 g (2.2 lb)
Environmental
Ambient Temperature -25°C to +55°C
(-13F to 131°F)
*) Technical performance data acc. to IEC 60268-5
LBC 3080/01
Dimensions 147 x 87 mm
(dia x max. depth) (5.8 x 3.4 inch)
Certified B15 acc. to DIN 4102
Color White (RAL 9010)
Weight 360 g (0.8 lb)
LBC 3090/31 + LBC 3080/01 fire dome assembly dimensions

4. 4 | LBC 3090/31 Ceiling Loudspeaker
Ordering Information
Model & Description
LBC 3090/31 Ceiling Loudspeaker
LBC 1256/00 EVAC Connection Adapter
3-pole screw connector
LBC 3080/01 Fire Dome
Americas: Europe, Middle East, Africa: Asia-Pacific:
Bosch Security Systems Bosch Security Systems B.V. Bosch Security Systems Pte Ltd
130 Perinton Parkway P.O. Box 80002 38C Jalan Pemimpin
Fairport, New York, 14450, USA 5600 JB Eindhoven, The Netherlands Singapore 577180
Phone:+1 (0) 585 223 4060 Phone:+31 (0) 40 27 83955 Phone:+65 6319 3450
Fax:+1 (0) 585 223 9180 Fax:+31 (0) 40 27 86668 Fax:+65 6319 3499
security.sales@us.bosch.com emea.securitysystems@bosch.com apr.securitysystems@bosch.com
http://www.boschsecurity.us http://www.boschsecurity.com http://www.boschsecurity.com
Data subject to change without notice | Printed in The Netherlands | 27. Jun 2005