LBC 3087/41 - Loudspeaker BOSCH - Free user manual and instructions

Product Type	Ceiling Speaker
Brand	Bosch
Model	LBC 3087/41
Colour	White
Material	Metal grille, plastic baffle
Rated Power	6 W (at 100 V)
Impedance	100 V line: 6.7 kΩ, 8 Ω low impedance
Frequency Range	100 Hz – 16 kHz
Sensitivity	90 dB (1 W/1 m)
Dimensions (Ø × H)	175 mm × 80 mm
Weight	0.8 kg
Mounting	Ceiling recessed with spring clips
Connections	Screw terminals
Protection Rating	IP 44
Operating Temperature	-25 °C to +55 °C
Harmonics	Low distortion
Installation	Cut-out hole: 150 mm
Maintenance	Clean with dry cloth; do not wet
Safety	Use only with 100 V systems; observe polarity
Spare Parts	Grille, transformer, cone
Reparability	Replaceable components by qualified personnel

Frequently Asked Questions - LBC 3087/41 BOSCH

How do I connect the LBC 3087/41 speaker?

Use the screw terminals on the rear of the speaker. For 100 V line systems, connect the 100 V tap and the common terminal. For low-impedance 8 Ω operation, connect to the 8 Ω terminals. Ensure the amplifier is turned off during wiring.

Can this speaker be used outdoors?

The speaker has an IP44 rating, meaning it is protected from splashing water. It is suitable for covered outdoor areas or damp indoor environments, but not for direct exposure to rain or submersion.

How do I adjust the volume?

Volume adjustment is done via the transformer tap setting. The transformer provides power taps (e.g., 6 W, 3 W, 1.5 W) for 100 V systems. Select the appropriate tap to achieve desired loudness. For 8 Ω operation, volume is controlled by the amplifier.

What is the required cut-out size for ceiling mounting?

The cut-out hole diameter is 150 mm. The speaker fits into a standard ceiling tile with spring clips. Ensure the ceiling void is deep enough (at least 80 mm) to accommodate the speaker depth.

How should I clean the speaker?

Clean the grille and housing with a soft, dry cloth. Do not use water, solvents, or abrasive cleaners. For heavy dust, use a vacuum cleaner with a brush attachment. Avoid contact with the cone.

What amplifier is compatible with this speaker?

The speaker works with any 100 V line public address amplifier. It can also be used with a standard audio amplifier if connected to the 8 Ω terminals. Ensure the total connected speaker power does not exceed the amplifier's rated output.

Can I connect multiple LBC 3087/41 speakers in parallel?

Yes, multiple speakers can be connected in parallel on a 100 V line. Calculate total power draw by summing the tap settings. For 8 Ω parallel connection, ensure the combined impedance does not fall below the amplifier's minimum load (e.g., 4 Ω).

How do I mount the speaker in a false ceiling?

Cut a 150 mm hole in the ceiling tile. Insert the speaker into the hole and push until the spring clips snap into place, securing the speaker. Ensure the clips are fully extended and clamp the tile firmly. Refer to the installation guide for details.

Is this speaker suitable for 70 V systems?

Yes, the transformer supports 100 V operation but can also be used with 70 V systems. The power on each tap will be lower (e.g., 6 W tap becomes approximately 3 W at 70 V). Check the tap markings for corresponding ratings.

What is the frequency response of the LBC 3087/41?

The frequency response is 100 Hz – 16 kHz at -10 dB. This makes it suitable for speech and background music reproduction. For full-range music, consider adding a subwoofer for deeper bass.

USER MANUAL LBC 3087/41 BOSCH

Ceiling loudspeaker

LBC 3087/41

BOSCH

en Installation note

1

Installation

Figure 10

2

Technical data

LBC 3087/41

Electrical*

Maximum power 9 W
Rated power 6 / 3 / 1.5 / 0.75 W
Sound pressure level at 6 W / 1 W (1 kHz, 1 m)	97 dB / 89 dB (SPL)
Sound pressure level at 6 W / 1 W (1 kHz, 4 m)	85 dB / 79 dB (SPL)
Effective frequency range (-10 dB) 80 Hz	to 18 kHz
Opening angle at 1 kHz / 4 kHz (-6 dB)	160° / 65°
Rated voltage Rated impedance	100 V
	6 W 1667 Ohm
	3 W 3333 Ohm
	1.5 W 6667 Ohm
	0.75 W 13333 Ohm
Connector 3-pole screw terminal block

* Technical performance data acc. to IEC 60268-5

Mechanical

Diameter	199 mm (7.8 in)
Maximum depth 70.5 mm (2.8 in)
Mounting cut-out 165 + 5 mm (6.5 + 0.20 in)
Speaker diameter 152.4 mm (6 in)
Weight 720 g (1.6 lb)
Color White (RAL 9010)
Magnet weight 80 g (2.8 oz)

Environmental

Operating temperature	-25 to +55 °C (-13 °F to +131 °F)
Storage and transport temperature -40 to	+70 °C (-40 °F to +158 °F)
Relative humidity <95%

LBC 3080/01

Dimensions (dia. x max depth)	147 x 87 mm (5.8 x 3.4 in)
Weight 360 g (0.8 lb)
Color	Flame red (RAL 3000).

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.

Certification and Approvals

Certified B15 acc. to DIN 4102
Emergency Acc. to EN 54-24

Figure 2.1: Circuit diagram

Figure 2.2: Frequency response

Figure 2.3: Polar diagram (measured with pink noise)

CE1438

Bosch Security Systems BVTorenallee 49, 5617 BA Eindhoven, the Netherlands131438/CPD/0335

EN 54-24:2008Loudspeaker for voice alarm systemsfor fire detection and fire alarm systems for buildingsCeiling Loudspeaker 6 W and accessoriesLBC3087/41 and LBC3080/01Type ADoP: LP052915

Figure 2.4: CE label

Bosch Security Systems B.V.

Torenallee 49

5617 BA Eindhoven

Netherlands

www.boschsecurity.com

© Bosch Security Systems B.V., 2017