Bosch LBB 1920/00 Specifications

Communications Systems | LBB 1920/00 Plena Universal Pre-Amplifier

LBB 1920/00 Plena Universal Pre-Amplifier

www.boschsecurity.com

u Four universal low-noise input channels for

microphone or line

u Separate tone control, speech filter and direct

output per channel

u Selectable blocking, serial and mixing priorities

u Multifunctional inter-connection point

u Priority and emergency relay outputs

The Plena Pre-Amplifier is a versatile, high­performance unit with four mono-input channels. It
fulfills a wide variety of public address requirements at
a surprisingly low cost.

Functions

All input channels provide the choice of a balanced
3‑pin XLR-connector for microphone or line level
(selectable), a balanced 5‑pin DIN-connector for
microphone or line level with priority contact, or a line
level stereo cinch-connector, converted to mono.
Microphone inputs have a phantom power supply.
Each input channel has its own volume and tone
control, a selectable speech filter to reduce the bass
content of the speech signal for improved
intelligibility, and a balanced, direct output on XLR,
that bypasses the channel controls.

Three priority modes are available for the input
channels. In blocking mode the input channel that is
activated first gets priority over all other input
channels. In serial mode input channel 1 has priority
over channels 2, 3 and 4; channel 2 has priority over
channels 3 and 4; and channel 3 has priority over
channel 4. Each of the input channels can be mixed to
the master output, irrespective of priority, by
separately setting that channel to the mixing mode.

Balanced XLR interconnection input and output are
provided in combination with an insertion/cascade
selector. In insertion mode an external sound
processing device, e.g. an equalizer, can be connected
between these connections. In the cascade mode,
multiple LBB1920/00 pre-amplifiers can be cascaded
to increase the number of input channels to 8, 12, or
even more. Internally the interconnection input can be
switched as an emergency input with a signal level
detector (VOX). If an emergency audio signal is
detected, this channel overrides all others. The
emergency input channel has its own volume preset
and bypasses the master volume control.

For the emergency input another VOX activated relay is
provided to trigger external equipment or for local
volume control override. An overload protected 24
VDC output provides power for driving external relays,
making an external power supply unnecessary.

An additional microphone level output is available on
the DIN connector, parallel to the balanced XLR
master output. This provides an input signal for a
mixing desk or a microphone input channel for a mixer
amplifier, such as the Plena LBB 19xx/10. A tape
output is also available.

The master output channel, or one of the input
channels, can be selected to be monitored with
headphone connector and LED meter.

Controls and indicators

Front

• LED power level bar

• Power on indication LED (green)

• Power button

• Four treble control knobs

• Four bass control knobs

• Four channel volume control knobs

• Master volume control knob

• Headphone channel selection knob

Back

• Mains voltage switch

• Insertion/ cascade switch

Interconnections

Front

• Headphone jack

Back

• Four channel inputs, each consisting of:
– One DIN connector (priority)
– One XLR connector
– Two cinch connectors

• Four direct channel outputs

• Tape output

• Earth connection screw

• Emergency relay output

• 24 V DC backup power input

• 24 V DC output

• Insertion / cascade / emergency input

• Insertion / cascade output

• Master line output (XLR)

• Master mic output (priority)

• Mains socket

Certifications and approvals

Safety acc. to EN 60065

Immunity acc. to EN 55103-2

Emission acc. to EN 55103-1

Region Certification

Europe CE

Installation/configuration notes

LBB 1920/00 rear view

Parts included

QuantityComponent

1 LBB 1920/00 Plena Universal Pre-amplifier

1 Power cord

1 19”mounting brackets

1 Plena CD

1 Installation and User Instructions

Technical specifications

Electrical

Mains power supply

Voltage 230/115 VAC, ±15%, 50/60 Hz

Inrush current 1.5 A at 230 VAC / 3 A at 115 VAC

Max power consumption 25 VA

Battery power supply

Voltage 24 VDC, +15% / -15%

Current max 1 A

Performance

Frequency response 50 Hz to 20 kHz (+1 / -3 dB)

Distortion <0.5 %

Bass control ±10 dB at 100 Hz

Treble control ±10 dB at 10 kHz

Channel separation >70 dB at 1 kHz

Priority mute >40 dB

Dynamic range 100 dB

Mic/line inputs 4 x

Connectors 3-pin XLR / 5-pin DIN, balanced

Sensitivity 1 mV (microphone), 200 mV (line)

Impedance >1 kohm (microphone),

>5 kohm (line)

S/N (flat at max volume) >63 dB (microphone), >70 dB (line)

S/N (flat at min volume/
muted)

>75 dB

CMRR >40 dB (50 Hz – 20 kHz)

Headroom >25 dB

Speech Filter -3 dB at 315 Hz, high-pass, 6 dB /

oct

Phantom power supply 16 V via 1.2 kohm, in mic mode only

Line inputs 4 x

2 | LBB 1920/00 Plena Universal Pre-Amplifier

Connector Cinch, unbalanced, stereo converted

to mono

Sensitivity 200 mV

Impedance 22 kohm

S/N (flat at max volume) >70 dB

S/N (flat at min volume/
muted)

>75 dB

Headroom >25 dB

Direct outputs 4 x

Connector 3-pin XLR, balanced

Nominal level 1 V

Impedance <100 ohm

Master output 1 x

Connector 3-pin XLR, balanced

Nominal level 1 V

Impedance <100 ohm

Master output 1 x

Connector 5-pin DIN, balanced

Nominal level 4 mV (microphone level)

Impedance <100 ohm

Tape output 1 x

Connector Cinch, 2 x mono

Nominal level 350 mV

Impedance <1 kohm

Headphone output 1 x

Connector 6.3 mm jack stereo, signal mono

Nominal level 3 V

Impedance <100 ohm

Emergency input 1 x

Connector 3-pin XLR, balanced

Sensitivity 200 mV (interconnection), 100 mV

to 1V adjustable (emergency)

Impedance >10 kohm

VOX Threshold 45 mV (emergency)

Interconnection output

Connector 3-pin XLR, balanced

Nominal level 200 mV

Impedance <100 ohm

Relays

Priority Relay Contacts 30 V, 1 A

Emergency Relay Contacts 30 V, 1 A

DC supply output 24 V, 250 mA max

Mechanical

Dimensions (H x W x D) 100 x 430 x 270 mm

(19" wide, 2U high)

Weight Approx. 5 kg

Mounting Standalone, 19” rack

Color Charcoal

Environmental

Operating temperature -10 ºC to +55 ºC (+14 ºF to

+131 ºF)

Storage temperature -40 ºC to +70 ºC (-40 ºF to

+158 ºF)

Relative humidity <95%

Ordering information

LBB 1920/00 Plena Universal Pre-Amplifier

high-performance unit with four mono-input channels.

Order number LBB1920/00

3 | LBB 1920/00 Plena Universal Pre-Amplifier

4 | LBB 1920/00 Plena Universal Pre-Amplifier

Represented by:

Americas: Europe, Middle East, Africa: Asia-Pacific: China: America Latina:

Bosch Security Systems, Inc.
12000 Portland Avenue South
Burnsville MN 55337, USA
Phone: [phone]
Fax: [phone]
[e-mail]
www.boschsecurity.com

Bosch Security Systems B.V.
P.O. Box 80002
5617 BA Eindhoven, The Netherlands
Phone: + 31 40 2577 284
Fax: [phone]
[e-mail]
www.boschsecurity.com

Robert Bosch (SEA) Pte Ltd, Security
Systems
11 Bishan Street 21
Singapore 573943
Phone: [phone]
Fax: [phone]
[e-mail]
www.boschsecurity.asia

Bosch (Shanghai) Security Systems Ltd.
201 Building, No. 333 Fuquan Road
North IBP
Changning District, Shanghai
200335 China
Phone [phone]
Fax: [phone]
www.boschsecurity.com.cn

Robert Bosch Ltda Security Systems Division
Via Anhanguera, Km 98
CEP 13065-900
Campinas, Sao Paulo, Brazil
Phone: [phone]
Fax: [phone]
[e-mail]
www.boschsecurity.com

© Bosch Security Systems 2012 | Data subject to change without notice
1886521867 | en, V2, 24. Nov 2012