Bosch LBB 1903/10, LBB 1906/10, LBB 1912/10, LBB 1914/10 Installation And Operating Manual

Communications Systems | LBB 190x/10 and LBB 191x/10 Plena Mixer Amplifiers

The Plena mixer amplifier is a versatile, high-performance
unit with four mono microphone inputs and a music input.
It fulfills a wide variety of public address requirements at
a surprisingly low cost.

Functions

All input channels have a phantom power supply to
provide power to condenser microphones and selectable
speech filters for improved intelligibility. Input channels 3
and 4 can also be switched to line sensitivity. Separate
music inputs are available with their own input selector
and volume control.

Input channel 1 can take priority over all other
microphone and music inputs. Contact closure on the 5­pin DIN connector, or if the signal level on channel 1
exceeds a predefined value (VOX) will activate priority. A
2-tone chime can be configured to precede a priority
announcement. A telephone or emergency input with VOX
activation and its own preset volume control overrides all
other input.

Loop through input and output connections enable
external sound processing equipment, such as an
equalizer or the Plena feedback suppressor, to be
connected between the preamplifier and the power
amplifier stages. An LED VU-meter monitors the master
output. The unit also has a tape output channel.

The Plena mixer amplifiers come in a range of maximum
output power. This power is directly available on 70 V and
100 V constant voltage connections and on a low
impedance connection for an 8 ohm load. Moreover, the
amplifiers have a separate 70 V / 100 V call-only output
channel for addressing areas where only priority
announcements are required, and a 70 V / 100 V mix-only
output channel for areas where no priority
announcements should be heard. The call-only output can
also be used for 3-wire remote, volume control override.
For more output power than the built-in power stage can
deliver, additional Plena power amplifiers can be
connected to the balanced line output in a loop-through
arrangement.

The LBB 1914/10 offers the same functionality as the
LBB 1912/10 but also has two front-panel switches to
direct the amplifier output to two separate zones. This is
useful when certain announcements or background music
should not be heard in part of a building. Priority calls,
however, are always routed to both zones.

LBB 190x/10 and LBB 191x/10 Plena
Mixer Amplifiers

▶

Range of single and dual zone mixer amplifiers from
30 W to 120 W

▶

Four low-noise balanced inputs for microphone or line

▶

Selectable priority & VOX switching on microphone
input 1

▶

Optional 2-tone chime to precede announcements

▶

VOX activated emergency override

▶

Outputs for normal, call-only and mix-only zones

▶

Choice of CD, tuner or auxiliary music inputs

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2 | LBB 190x/10 and LBB 191x/10 Plena Mixer Amplifiers

Controls and indicators
Front

•

LED power meter

•

Power on LED

•

Master volume control knob

•

Four volume control knobs for mic inputs

•

Three knobs for BGM volume, treble, and bass levels

•

BGM source selection knob

•

On/off switch

•

Two zone selection buttons (LBB1914/10 only)

Back

•

EMG input volume control

•

Two mic/line switches

•

Chime on/off switch

•

Mains voltage switch

Interconnections
Front

•

Headphone jack

Back

•

Priority mic input (DIN/6.3 mm jack)

•

Mic input (XLR/6.3 mm jack)

•

Two mic/line inputs (XLR/6.3 mm jack)

•

Three audio inputs (2 x cinch)

•

EMG input (screw)

•

Line output (XLR)

•

Tape output (2 x cinch)

•

Insertion input/output (2 x cinch)

•

24 VDC input

•

Three (five for the LBB 1914/10) loudspeaker outputs
(screw)

Certifications and Approvals

Region Certification

Europe CE Declaration of Conformity

Safety acc. to EN 60065

Immunity acc. to EN 55103-2

Emission acc. to EN 55103-1

Installation/Configuration Notes

LBB 190x/10 and LBB 191x/10 rear view

Parts Included

Quantity Components

1 LBB 190x/10 Plena Mixer Amplifier

or
LBB 191x/10 Plena Mixer Amplifier

1 Power cord

1 Set of 19” mounting brackets

1 Installation and User Instructions

Technical Specifications

Electrical

Mains power supply

Voltage 230/115 VAC, ±10%, 50/60 Hz

Inrush current

LBB 1903/10 4.5 / 9 A (230 / 115 VAC)

LBB 1906/10 5 A / 10 A (230 / 115 VAC)

LBB 1912/10, LBB 1914/10 8 / 16 A (230 / 115 VAC)

Battery power supply

Voltage 24 VDC, +15% / -15%

Current

LBB 1903/10 1.6 A

LBB 1906/10 3 A

LBB 1912/10, LBB 1914/10 6 A

Performance

Frequency response 50 Hz to 20 kHz (+1 / -3 dB at -10 dB ref.

rated output)

Distortion <1% at rated output power, 1 kHz

Bass control -8 / +8 dB at 100 Hz

Treble control -8 / +8 dB at 10 kHz

Dynamic range 100 dB

Mic input 2 x

Connector 1 5-pin DIN, 6.3 mm phone jack, balanced,

with phantom power

Connector 2 3-pin XLR, 6.3 mm phone jack, balanced,

with phantom power

Sensitivity 1 mV

Impedance >1 kohm

S/N (flat at max volume) 63 dB

S/N (flat at min volume/muted) >75 dB

CMRR >40 dB (50Hz-20kHz)

Headroom >25 dB

Speech filter -3 dB at 315 Hz, high-pass,

6 dB/oct

Phantom power supply 16 V via 1.2 kohm

VOX (input 1 only) attack time 150 ms; release time 2 s

LBB 190x/10 and LBB 191x/10 Plena Mixer Amplifiers | 3

Mains power supply

Mic/line input 2 x

Connector 3, 4 3-pin XLR, 6.3 mm phone jack, balanced,

with phantom power

Sensitivity 1 mV (mic); 200 mV (line)

Impedance >1 kohm (mic); >5 kohm (line)

S/N (flat at max volume) >63 dB (mic); >70 dB (line)

S/N (flat at min volume/muted) >75 dB

CMRR >40 dB (50 Hz to 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 (mic)

Music input 1 x

Connector Cinch, 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

Emergency / telephone 1 x

Connector Screw terminals

Sensitivity 100 mV to 1 V, adjustable

Impedance >10 kohm

S/N (flat at max volume) >65 dB

VOX 50 mV threshold ; 150 ms attack time;

2 s release time

Loop through input 1 x

Connector Cinch

Nominal level 1 V

Impedance >10 kohm

Master line output 1 x

Connector 3-pin XLR, balanced

Nominal level 1 V

Impedance <100 ohm

Tape output 1 x

Connector Cinch, 2 x mono

Nominal level 350 mV

Impedance 1.5 kohm

Loop through output 1 x

Connector Cinch

Nominal level 1 V

Impedance <100 ohm

Loudspeaker output
70/100 V

Connector Screw, floating

Power Max / rated

LBB 1903/10 45 / 30 W

Mains power supply

LBB 1906/10 90 / 60 W

LBB 1912/10, LBB 1914/10 180 / 120 W

Loudspeaker output 8 ohm

Connector Screw, floating

Power

LBB 1903/10 16 V (30 W)

LBB 1906/10 22 V (60 W)

LBB 1912/10, LBB 1914/10 31 V (120 W)

Power reduction on 24 V 1 dB

Power consumption

Mains operation max

LBB 1903/10 100 VA

LBB 1906/10 200 VA

LBB 1912/10, LBB 1914/10 400 VA

24 V operation max

LBB 1903/10 1.6 A

LBB 1906/10 3 A

LBB 1912/10, LBB 1914/10 6 A

Mechanical

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

(19" wide, 2U high)

Weight

LBB 1903/10 Approx. 5 kg

LBB 1906/10 Approx. 8.5 kg

LBB 1912/10, LBB 1914/10 Approx. 10.5 kg

Mounting Standalone, 19" rack

Color Charcoal

Environmental

Operating temperature -10 ºC to +45 ºC (+14 ºF to +113 ºF)

Storage temperature -40 ºC to +70 ºC (-40 ºF to +158 ºF)

Relative humidity <95%

Acoustic noise level of fan <48 dB SPL at 1 m (max output)

www.boschsecurity.com

4 | LBB 190x/10 and LBB 191x/10 Plena Mixer Amplifiers

Ordering Information

LBB 1903/10 Plena Mixer Amplifier

45W/30 W, 100 VA, 4.5 A / 9 A (230 Vac/
150 Vac)

LBB1903/10

LBB 1906/10 Plena Mixer Amplifier

90 W / 60 W, 200 VA, 5 A / 10 A (230 Vac/
150 Vac)

LBB1906/10

LBB 1912/10 Plena Mixer Amplifier

180 W/120 W, 100 VA, 8 A / 16 A (230 Vac/
150 Vac)

LBB1912/10

LBB 1914/10 Plena Mixer Amplifier

180 W /120 W, 100 VA, 8 A / 16 A (230 Vac/
150 Vac);
2 zone

LBB1914/10

Americas:

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

Europe, Middle East, Africa:

Bosch Security Systems B.V.
P.O. Box 80002
5600 JB Eindhoven, The Netherlands
Phone: + 31 40 2577 284
Fax: [phone]
[e-mail]
www.boschsecurity.com

Asia-Pacific:

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

Represented by

© Bosch Security Systems Inc. 011 | Data subject to change without notice
T865996555 | Cur: en-US, V22, 27 Jan 2011

Plena Mixer Amplifier

Installation and Operating Manual

LB B 19 03/10, LB B 19 06 /10,
LB B 1912/10, L BB 1914/10

en

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Plena Mixer Amplifier | Installation and Operating Manual | Important safeguards en | 3

Important safeguards

1 Read instructions - All the safety instructions for use

should be read before the system is operated.

2 Retain instructions - The safety instructions and

instructions for use should be retained for future
reference.

3 Heed warnings - All warnings on the unit and in the

operating instructions should be adhered to.

4 Follow instructions - All operating instructions and

instructions for use should be followed.

5 Cleaning - Unplug system units from the mains outlet

before cleaning. Do not use liquid cleaners or aerosol
cleaners. Use a damp cloth for cleaning.

6 Attachments - Do not use attachments not

recommended by the product manufacturer as they may
cause hazards.

7 Water and Moisture - Do not use this unit near water, for

example near a bathtub, washbowl, kitchen sink, or
laundry basket, in a wet basement, near a swimming
pool, in an unprotected outdoor installation or any area
which is classified as a wet location.

8 Accessories - Do not place this unit on an unstable stand,

tripod, bracket or mount. This unit may fall, causing
serious injury to a person and serious damage to the
unit. Use only a stand, tripod, bracket or mount
recommended by the manufacturer, or sold with the
product. Any mounting of the unit should follow the
manufacturer's instructions, and should use a mounting
accessory recommended by the manufacturer. An
appliance and cart combination should be moved with
care. Quick stops, excessive force, and uneven surfaces
may cause the appliance and cart combination to
overturn.

9 Ventilation - Openings in the enclosure, if any, are

provided for ventilation and to ensure reliable operation
of the unit and to protect it from overheating. These
openings must not be blocked or covered. The unit
should not be placed in a built-in installation unless
proper ventilation is provided or the manufacturer's
instructions have been adhered to.

10 Power sources - Units should be operated only from the

type of power source indicated on the marking label. If
you are not sure of the type of power supply you plan to
use, consult your appliance dealer or local power
company. For units intended to operate from battery
power, or other sources, refer to the "Installation and
User Instructions".

11 Grounding or polarisation - This unit may be equipped

with a polarised alternating current line plug (a plug
having one blade wider than the other). This plug will fit
into the power outlet only one way. This is a safety
feature. If you are unable to insert the plug fully into the
outlet, try reversing the plug. If the plug still fails to fit,
contact your electrician to replace your obsolete outlet.
Do not defeat the safety purpose of the polarised plug.
Alternatively, this unit may be equipped with a 3-wire
grounding type plug having a third (grounding) pin.
This plug will only fit into a grounding-type power
outlet. This is a safety feature. If you are unable to insert
the plug into the outlet, contact your electrician to
replace your obsolete outlet. Do not defeat the safety
purpose of the grounding-type lug.

12 Power-Cord Protection - Power supply cords should be

routed so that they are not likely to be walked on or
pinched by items placed upon or against them, paying
particular attention to cords and plugs, convenience
receptacles, and the point where they exit from the
appliance.

13 Overloading - Do not overload outlets and extension

cords as this can result in a risk of fire or electrical shock.

14 Object and Liquid Entry - Never push objects of any

kind into this unit through openings as they may touch
dangerous voltage points or short-out parts that could
result in a fire or electric shock. Never spill liquid of any
kind on the unit.

15 Servicing - Do not attempt to service this unit yourself as

opening or removing covers may expose to dangerous
voltage or other hazards. Refer all servicing to qualified
service personnel.

16 Damage Requiring Service - Unplug the unit from the

outlet and refer servicing to qualified service personnel
under the following conditions:

• When the power-supply cord or plug is damaged.

• If liquid has been spilled, or objects have fallen into
the unit.

• If the unit has been exposed to rain or water.

• If the unit does not operate normally by following
the instructions for use. Adjust only those controls
that are covered by the instructions for use, as an
improper adjustment of other controls may result in
damage and will often require extensive work by a
qualified technician to restore the units to their
normal operation.

• If the unit has been dropped or the unit has been
damaged.

• When the unit exhibits a distinct change in
performance; this indicates a need for service.

17 Replacement Parts - When replacement parts are

required be sure the service technician has used
replacement parts specified by the manufacturer or parts
which have the same characteristics as the original part.
Unauthorised substitutions may result in fire, electric
shock or other hazards.

18 Safety Check - Upon completion of any service or

repairs to the units, ask the service technician to perform
safety checks to determine that the unit is in proper
operating condition.

19 Lightning - For added protection of the units during a

lightning storm, or when it is left unattended and unused
for long periods of time, unplug it from the wall outlet
and disconnect the cable system. This will prevent
damage to the unit due to lightning and power-line
surges.

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Plena Mixer Amplifier | Installation and Operating Manual | About this manual en | 4

About this manual

This manual provides all the information required to install and operate the unit.

Conventions

Safety precautions

Warning

Follow these instructions to prevent personal injury.

Caution

Follow these instructions to prevent damage to the equipment.

Note

Read these instructions for tips and other useful information.

Warning

Do not open the unit when it is connected to the mains. The unit contains non-insulated parts, which can
cause electric shock.

Caution

There are no user-serviceable parts inside the unit. Service must be done by qualified personnel.

Bosch Security Systems | 2003-09 | 3922 988 92883en

Plena Mixer Amplifier | Installation and Operating Manual | Table of contents en | 5

Table of contents

Important safeguards..........................................................................................................................................................3

About this manual ..............................................................................................................................................................4

Safety precautions...............................................................................................................................................................4

Table of contents ................................................................................................................................................................5

1 About the mixer amplifier ................................................................................................................................................7

1.1 Controls and connections (front) .............................................................................................................................8

1.2 Controls and connections (rear) ..............................................................................................................................9

2 Internal settings ................................................................................................................................................................10

2.1 Setting the VOX for microphone input 1 ............................................................................................................10

2.2 Setting the speech filters .........................................................................................................................................10

2.3 Setting the chime volume ......................................................................................................................................11

2.4 Setting the output voltage for LBB1903, LBB1906 and LBB1912 ....................................................................11

2.5 Setting the output voltage for LBB1914 ...............................................................................................................11

3 Installation in rack ...........................................................................................................................................................12

4 External settings and connections .................................................................................................................................13

4.1 Connect the DC supply (battery) ..........................................................................................................................13

4.2 Priority microphone ...............................................................................................................................................13

4.3 Chime ON/OFF-switch .........................................................................................................................................14

4.4 Microphone inputs ..................................................................................................................................................15

4.5 Emergency input .....................................................................................................................................................15

4.6 Music source inputs ................................................................................................................................................16

4.7 Connecting the line output ....................................................................................................................................16

4.8 Connecting loudspeakers .......................................................................................................................................17

4.8.1 Constant voltage loudspeakers .........................................................................................................................17

4.8.2 Low impedance loudspeakers ..........................................................................................................................18

4.9 Mains connection ....................................................................................................................................................18

5 Operation of mixer amplifier .........................................................................................................................................19

5.1 Source selection .......................................................................................................................................................19

5.2 Volume and tone control .......................................................................................................................................19

5.3 Zone selection (LBB1914/10 only) .......................................................................................................................19

6 Technical data ..................................................................................................................................................................20

6.1 Electrical ..................................................................................................................................................................20

6.2 Performance ............................................................................................................................................................20

6.3 Inputs ........................................................................................................................................................................20

6.4 Outputs .....................................................................................................................................................................21

6.5 Environmental conditions ......................................................................................................................................21

6.6 General .....................................................................................................................................................................22

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Plena Mixer Amplifier | Installation and Operating Manual | en | 7

1 About the mixer amplifier

Figure 1.1

The Plena Mixer Amplifier is a mono amplifier for mixing up to 4 microphone signals and (background) music
signals. You can adjust the volume of each input separately in order to obtain the correct mix and control the mixed
output via the master volume and tone controls. Microphone input 1 can have priority with an optional chime
signal, muting other sources. The power amplifier has a direct output for mixed signals and priority announcements,
but additionally a priority controlled output relay routes the output to loudspeaker zones that should receive only
priority announcements or no priority announcements at all.

About the mixer amplifier

LINE/MIC

LINE

/

MIC

INSInIN

Click
suppression

S

Out

Phantom
Power

201

0

0

0

8Ohm

8Ohm

70V

100V

100V

70V
JP802

100V

0

70V

0

0

+

-

24V

24V

Call Only

0

Mix O nly

0

Call Active

8Ohm

8Ohm

70V

70V

100V

100V

JP901

0

0

+

-

24V

24V

Call Only

Zone 2

Zone 1
Call/Mix

Call/Mix

Call/Mix

Call Active

Mix O nly

Z1 Front

Z2 Front

Only for LBB1914/10

JP902
100/70

0

0

0

0

0

0

0

0

0

0

0

0

0

JP406

JP401

JP402

JP403

JP405

115V,230V

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1.1 Controls and connections (front)

Figure 1.2

3

0dB

-6 dB

-20 dB

Power

1

4

2

Line

CD AUX

Master Zone 1 Zone 2

Select

Plena Mixer Amplifier

2

1

5 6 7 10 11 12 13

3

4 8 9

Only for LBB1914/10

1 Power button
2 VU-meter (LED's for -20, -6, 0 dB and Power ON)
3 Input 1 (microphone) volume control
4 Input 2 (microphone) volume control
5 Input 3 (microphone) volume control
6 Input 4 (microphone) volume control
7 Line (music source) volume control

8 Music source selector (CD, tape, AUX)
9 Master tone control (treble)
10 Master tone control (bass)
11 Master volume control (all inputs except emergency)
12 Zone 1 selection button (LBB1914/10 only)
13 Zone 2 selection button (LBB1914/10 only)

About the mixer amplifier

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Plena Mixer Amplifier | Installation and Operating Manual | en | 9

1.2 Controls and connections (rear)

Figure 1.3

1 Chime ON/OFF switch
2 Priority microphone input (5-pole DIN/balanced

with Phantom power)

3 Input 1 microphone input (6.3 mm phono jack/

balanced with Phantom power)

4 Microphone input (XLR/balanced with Phantom

power in microphone mode)
5 Microphone input (6.3 mm phono jack/balanced)
6 Input Mic./Line switch
7 Emergency connection input terminals
8 Emergency volume pre-set
9 CD input (2x phono connectors)
10 Tape input (2x phono connectors)
11 Auxiliary input (2x phono connectors)

12 Line output (XLR)
13 Tape output (2x phono connectors)
14 Insertion input/output (2x phono connectors)
15 Loudspeaker output terminals and 24 Vdc power

supply terminals
16 Mains connector (3-pole)
17 Earth connection screw
18 Mains fuse

LBB1903 T1A (230 Vac) / T2A (115 Vac)

LBB1906 T1.6A (230 Vac) / T3.15A (115 Vac)

LBB1912 T2.5A (230 Vac) / T5A (115 Vac)

LBB1914 T2.5A (230 Vac) / T5A (115 Vac)
19 Mains voltage 115/230 V switch

31

1

45

L

R

CD Aux Line Out 1V

Mic/Line Mic/Line

Inc

Out

In

0

0

Chime

Tel/Emer.

2

1

GND

231

++GND

2

3

2 3 4

230V115V

Call/Mix

24VDCIn

CallOnly Mix Only

100V 0 70V 0 100/70V 0 100/70V 080

7

12

4 43 5 5 4 5 15

15

Only for LB B 1914 /10

16 186 6

8 9 10 11 12 13 14 19

17

24VDCIn

Call/Mix

Zone1 Zon e 2

CallOnly Mix Only

100/70V/8 0 100/70V 0 100/70V 0 100/70V 0 100/70V 0

About the mixer amplifier

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2 Internal settings

Figure 2.1

Figure 2.2

2.1 Setting the VOX for microphone input 1

Input 1 has the option of a voice-controlled priority (VOX), which will overrule all other inputs when it recognizes
a voice signal. To activate this function, set the VOX-jumper (JP406) to ON.

2.2 Setting the speech filters

The speech intelligibility can be improved by cutting off the lower frequencies of the signal. To activate this filter for
each microphone input, set the respective filter jumper (JP401 for input 1, JP402 for input 2, JP403 for input 3 and
JP405 for input 4) to ON.

Internal settings

Mic. 1

Mic. 2

Mic. 3

Mic. 4

VOX

OFF

ON

123 123

70V

JP802

LBB1903/10
LBB1906/10
LB B1912/10

100 V

123 123

JP405

JP403

JP402

JP401

VR401

JP802

70V

100V

JP406

Mic.1

Mic.2

Mic.3

Mic.4

VOX

JP405

JP403

JP402

JP401

JP406

Mic. 1

Mic. 2

Mic. 3

Mic. 4

VOX

OFF

ON

123 123

70V/100V

8Ohm

123 123

JP405

JP403

JP402

JP401

JP902

JP406

Mic.1

Mic.2

Mic.3

Mic.4

VOX

JP405

JP403

JP402

JP401

JP406

70V

100 V

123 123

JP901

LBB1914/10

JP902

JP901

VR401

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Plena Mixer Amplifier | Installation and Operating Manual | en | 11

2.3 Setting the chime volume

Adjusting the potentiometer VR401 changes the volume of the chime attention signal, preceding a priority call. Be
careful not to adjust VR701; this is a power amplifier factory adjustment.

2.4 Setting the output voltage for LBB1903, LBB1906 and LBB1912

Direct outputs for 70 V, 100 V and low impedance (8 Ohm) loudspeakers are provided. Jumper JP802 sets the Call
Only and Mix Only outputs to 70 V or 100 V output. These outputs are controlled by a priority relay. The Call
Only output only provides priority announcements, while the Mix Only output just provides the mixed signals and
switches off at priority calls.

2.5 Setting the output voltage for LBB1914

Jumper JP901 sets the Call/Mix, Zone 1, Zone 2, Call Only and Mix Only outputs to 70 V or 100 V output. Setting
JP902 can also set the direct Call/Mix output to 8 Ohm for low impedance loudspeakers. The Call Only and Mix
Only outputs are controlled by a priority relay. The Call Only output only provides priority announcements, while
the Mix Only output just provides the mixed signals and switches off at priority calls. The zone selection buttons
control the outputs of Zone 1 and 2, but priority announcements are always routed to these zones.

Internal settings

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3 Installation in rack

Figure 3.1

The mixer amplifier is delivered for tabletop use, but you can mount it in a 19" rack.
If you mount the amplifier in a rack, you must:

• ensure that the unit does not exceed the overheating temperature (45 °C ambient).

• use the mounting brackets which can be ordered by Bosch (LBC 1901/00).

• remove the 4 feet from the bottom of the unit. Without the feet the unit is 2U high.

Installation in rack

115V/2 30V

Apparatus delivered
connected for 230V-

Ratedinput
power : 400VA

Thisapparatusmust

Warning

Call/Mix

24VD

C

In

Cal

l Only Mix Only

70

V0

100/70

V 0

100/70

V 0

80

12 V D C

12 V D C

- + - +

F

LBB1903 (30W); F=F5A

LBB1906 (60W); F=F8A
LBB1912 (120W); F=F15A
LBB1914 (120W); F=F15A

11
5

V/
2

30
V

A
p
par

a
t
u
s

del

i
v
ered

connect

ed

f
o
r

2
3
0

V

-

Rat

ed
i
nput

pow

er:
400VA

T
h

i
s
ap
p

ar
a
t
us

m
u

s
t
b
e

ea
r
th

e
d

Wa

r
n
i
n
g

2

1

3

4

M
ic

/
L
in

e

M
ic/Li

n
e

C

D

L

R

Au

x

Li
n
e
O

ut1V

In

c

O

ut

In

Te
l/Eme

r
.
0

0
2

C
h
im

e

4
.5

1-

-3

Ca
ll/M

i
x

24VD
C

In

C
allOnly

Mi
x

On
ly

100
V0

7
0
V 0

1
00/7
0

V
0

10
0/70

V
0

8 0

4

3

2

0dB

-6dB

-

20dB

Powe

r

1

Select

CD

AUX

Master

Line

+

+

1

Plena Mixer Amplifier

Bosch Security Systems | 2003-09 | 3922 988 92883en

Plena Mixer Amplifier | Installation and Operating Manual | en | 13

4 External settings and connections

4.1 Connect the DC supply (battery)

Figure 4.1

The mixer amplifier has a 24 Vdc input (terminal screw), which you can use to connect a back up power supply, e.g.
batteries. You can earth the unit to increase the electrical stability of the system.

4.2 Priority microphone

Figure 4.2

Caution

The connection cable must have an in-line fuse. Use the type of fuse as mentioned in the illustration.

External settings and connections

115V/2 3 0V

Apparatus delivered
connected for 230V-

Ratedinput
power:400VA

This apparatus must

Warning

Call/Mix

24VD

C

In

Call Only

Mix Only

70

V0

100/70

V 0

100/70

V 0

80

12 V D C

12 V D C

- + - +

F

LBB1903 (30W); F=F5A

LBB1906 (60W); F=F8A
LBB1912 (120W); F=F15A
LBB1914 (120W); F=F15A

1
1

5V/

2
30

V

A

p
par

at

u
s

del
i
v

ered

connect

ed

f
o
r
2

3
0
V

-

Rated

i
nput

pow

er:

400VA

T
h

i
s
ap

p
ar

a
t
us

m
u

st
b

e
ear

th

e
d

Wa

r
n
i

n
g

2

1

3

4

M

ic
/

L
in

e

M

ic
/Li

n

e

C

D

L

R

Au

x

Li

ne

Out1V

In

c

Out

In

T
e
l/Eme

r
.

0

0

2

C
h

im

e

4
.5

1

-

-3

C

a
ll

/M

i
x

24VD

C
In

C
allOnly

Mi

x
On

ly

100

V0

7
0

V 0

1

00/7

0
V

0

10
0/70

V

0

8 0

115V/230V

Apparatusdelivered
connecte

d
for230V-

Rated

input

pow

e

r:400VA

Thisapp

aratusmu

st

b

eea

r

thed

Warning

2

1

3

4

Mic/Line

Mic/Line

CD

L

R

Aux

LineOut 1V

Inc

Out

In

Tel/Emer.

0

0 2

Chime

4 .5

1- -3

Call

/
Mix

24VD

C

In

Cal

lOnl

y MixOnl

y

100V 07

0V 0

100/70V0

100/70V0

8 0

180 5 - po le D I N6.3 mm phono jack

180 3-pole X LR

GND

GND

2

Bosch Security Systems | 2003-09 | 3922 988 92883en

Plena Mixer Amplifier | Installation and Operating Manual | en | 14

Microphone 1 input has a 5-pole DIN (for a 3 or 5-pole DIN microphone) and a 6.3-mm phone jack connector
wired in parallel. Only when connecting a microphone with a priority contact on pin 4 and 5 of the 5-pole DIN
connector (2), this input has priority over all inputs except the emergency input. This microphone input can be
included with a voice controlled circuit (VOX) which will overrule all the other input signals. How to activate the
VOX is described in §2.1.

4.3 Chime ON/OFF-switch

Figure 4.3

Depending on the position of the chime ON/OFF-switch (1), switching on microphone 1 will activate the chime.
The default chime volume is -8 dB (40 V), which will be sufficient in most applications. The volume can be altered
using the potentiometer VR401 on the main PCB of the unit (see §2.3).

Note

Only use one of the two connection possibilities of each microphone input.

Note

Only when connecting a 5-pole DIN microphone to the 5-pole DIN connector of microphone input 1 the
chime can be activated.

External settings and connections

115V/230

V

Ap

p

ara

tusd

e

l
iv

ere

d

conn

e

ctedf

o

r23

0
V-

Rate

di

n

put

power:400VA

Thisapparat

u
sm

u

stbeea

r

thed

Warning

2

1

3

4

Mi

c/Line

Mic/L

i
ne

CD

L

R

Aux

Line

Out1V

Inc

Out

In

Tel/Emer.

0

0 2

Chime

4 .

5

1- -3

C

all/M

ix

24VDC

In

Ca

l

l
On

ly

Mix

Only

100V 0

70V 0 1

0
0/

70V

0

100/70

V0

8 0

1

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Plena Mixer Amplifier | Installation and Operating Manual | en | 15

4.4 Microphone inputs

Figure 4.4

Dependent on the microphone choose between the XLR with Phantom power and the 6.3 mm phono jack
connector. Use an extension cable (1) if necessary. When using input 3 or 4 to connect microphones, set the
switches (6) to Mic. When using these inputs as line-inputs, set the switches (6) to Line. To cut-off the lower
frequencies of the signal, activate the speechfilters on the PCB (see §2.2).

4.5 Emergency input

Figure 4.5

The emergency input is for emergency announcements/signals and obviously has the highest priority (all other
inputs are overruled). The emergency volume -which cannot be affected by the master volume control (11) - can be
set at 8, using a screwdriver. It can not be set to zero.

Caution

A connection to a telephone network must always be made via a telephone coupler that provides adequate
isolation between the telephone network (PBX) and the Plena system. The telephone coupler must also meet
all relevant requirements for this type of communication equipment as imposed by law and/or responsible
telecommunication organisations in the country of use. Never try to make a direct connection between the
telephone network and the mixer amplifier.

External settings and connections

2

1

3

4

Mic/Line

Mic/Line

CD

L

R

Aux

LineOut 1V

Inc

Out

In

Tel/Emer.

0

0 2

Chime

4 .5

1- -3

6 6

1

115

V
/230V

Ap
pa

ra

tusd

el

i
v
e

r
e
d

con

necte

d
for

23

0
V

-

R
a
te

di
n

put
po
wer

:40

0
V
A

T

hi
sap

pa
r
a

tus

mus

tb

e
e

a
rthed

War

n
ing

2

1

3

4

M

i
c/Line

M

i
c/L

i
n
e

CD

L

R

Aux

Li
neO

u
t1V

In

c

Out

In

Tel/Emer.

0

0

2

Chim

e

4
.5

1

--3

Call/Mi

x

2
4

VD
C

I

n

C
a

ll

On

lyMi

xOn

ly

1

0
0V07

0
V 0 100/

70V

01

00

/70V0

8

0

2

1

CD

L

R

A

Tel / Emer.

0

02

Chime

4 .5

1- -3

1

15V/230V

App

a
ratusde

l
iv
ere

d

con

n
e

c
t
e
df

or2
30

V

-

R
a
t
e

di
n
p

u
t

p
o
w
e

r:400VA

T

his

a
p
pa

r
a
tus

mus

tbe

ea
rt
h

ed

W

arning

2

1

3

4

Mic/

Line

Mic/

Line

C
D

L

R

Aux

L
ineOu

t1V

Inc

Out

I
n

Te

l
/Emer.
0

02

Ch
ime

4.
5

1

--3

Ca
l

l/Mi
x

2
4V

DCIn

C

al
lOnl

yMixOnly

1
00
V0

7

0
V

0100

/
70V0

10
0/70

V0

8 0

8

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Plena Mixer Amplifier | Installation and Operating Manual | en | 16

4.6 Music source inputs

Figure 4.6

When using a CD player, tape recorder or tuner for background music, connect the line-out connectors of the music
source to the appropriate line-in connectors of the mixer amplifier (e.g. the tape recorder must be connected to the
tape source input (10)). When using a tape recorder to record the output of the amplifier, connect the line-in
connectors of the tape recorder to the line-out connector (13) of the mixer amplifier.

4.7 Connecting the line output

Figure 4.7

The line output (12) is an output for connecting additional PA amplifiers (such as the Plena Booster Amplifiers).

2

1

3

4

Mic/Lin

Mic/Line

CD

R

Aux LineOut1V Inc

Tel/Emer.

0

0 2

Chime

4.5

1- -3

10

CD

PLAYBACK

TUNE R

LBB1961

RECORD

13

TAP E

1
15V/

230V

A
p

p
aratusdel

iv

e

r
e
d

c
onne

c
ted

f
or23

0
V-

R

a
tedi

n

pu

t

p

owe
r

:
4

00VA

T
h
i
sap

p
a
r
at

u

smu

s
tb

ee

art

he

d

W
a

r
n
i

n
g

2

1

3

4

M
i
c/Li

n

e

M

i
c/

Li
n

e

CD

L

R

A
u

x

L

i
n

e
Out1V

I
nc

Out

In

Te

l

/Em

e
r.

0

0 2

C
hi

m
e

4

.5

1

-­3

Call

/M

i
x

24
VD

C
In

Ca

llOn

l
y Mi

x
On

l
y

1

00

V0

7
0
V0

1
0
0/

70
V0100/

7
0
V0

8

0

Re
pe

a
t

Pr
ogr

am

F
o

ld
e
r

M
1/6

M
2

/7

M

3
/
8

M
4

/
9

M5

/1
0

Progra

m

Sc

a
n

FM

/
A
M

P
o
w

e
r

CD/

MP3

BG

M

so

ur

c
ePLEN

A

External settings and connections

2

1

3

4

Mic/Lin

Mic/Line

CD

L

R

Line Out 1V

Inc

Tel/Emer.

0

0 2

Chime

4 .5

1- -3

115V/

230

V

Ap

pa

r
a
tu

sd

el
iv

e
red

c
o

nne

ctedf

or

23

0

V-

Rate

d
inp

ut

p

owe

r:
40

0VA

Th
is

a
ppara

tus

m

us
tbee

a

rthed

Warnin

g

2

1

3

4

Mic/

L
ine

Mic

/
Line

CD

L

R

Aux

LineOut1

V

I
nc

Out

I
n

Tel/

Emer

.

0

02

Chime

4

.
5

1

-

-3

Cal

l/

Mix

24VDC

I
n

Cal

lOnlyM ix

O

nly

100

V

0

7
0V

0

10

0/70

V0

1
00/

70
V0

8

0

0

d

B

-6
dB

-2
0

d

B

P

ower

12

PlenaBooste

rAmpl

ifier

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Plena Mixer Amplifier | Installation and Operating Manual | en | 17

4.8 Connecting loudspeakers

Figure 4.8

4.8.1 Constant voltage loudspeakers

The mixer amplifier can drive 100 V constant voltage loudspeakers at full power (100 V) or half power (70 V).
Connect the loudspeakers in parallel and check the loudspeaker polarity for in-phase connection. The summed
loudspeaker power should not exceed the rated amplifier power. Ensure that the jumper(s) for loudspeaker voltage
selection is / are properly set (see §2.4).

You can use the Call Only output for 3-wire remote volume control override. In this case, ensure that the selected
voltage for the Call Only output is the same as for the direct output or the zone outputs.

0

0

0

8Ohm

8Ohm

70V

100V

100V

70V
JP802

100V

0

70V

0

0

+

-

24V

24V

Call Only

0

Mix O nly

0

Call Active

8Ohm

8Ohm

70V

70V

100V

100V

JP901

0

0

+

-

24V

24V

Call Only

Zone 2

Zone 1
Call/Mix

Call/Mix

Call/Mix

Call Active

Mix O nly

Z1 Front

Z2 Front

LBB1914/10

LBB1903/10
LBB1906/10
LBB1912/10

JP902
100/70

0

0

0

0

0

0

0

0

0

0

0

0

0

External settings and connections

115

V/

23

0
V

Ap

p
ar

at

u
s
de

l
ive

re

d

co

nn

ec
t
edf

o
r
2

3
0V-

Ra
t
e

d
i
n
p

ut
p
o
w
e

r
:4

0

0VA

Th
i

s
a
p

p
a
ra

t
u
s

m

us
t
b

e
e

a
rth

e
d

War

ni

ng

2

1

3

4

M
ic

/L
in

e

Mic

/L
in

e

C

D

L

R

A
u
x

L
in

eO

u
t1V

I
n
c

O

u
t

In

Te

l/Eme

r
.

0

0

2

Ch

ime

4.5

1

-­3

C
all/

Mix

24

VD
C

I
n

Cal

l
O

n
l
y

MixO

nl

y

10

0
V

0
7

0
V

0

100/

70
V

01
0

0/70V0

8

0

Call/Mix
direct out

100V

Call/Mix
direct out

70V

Call Only
100/ 70 V

Mix Only
100/ 70 V

8 Ohm

Call/Mix direct out 8 Ohm

Call/Mix

24VDCIn

Call Only MixOnly

100V070V

0

100/70V

0

100/70V

0

08

100V070V

0

100/70V

0

100/70V

0

08

Call/Mix

24VDCIn

Call Only MixOnly

4Ohm

4Ohm

8Ohm

8Ohm

8Ohm

8Ohm

LBB1903/10
LBB1906/10
LB B1912 /10

1
15V/

2
3

0
V

A

pp

ar
a

t
u
s

d
e
l

iv
e
re

d

co

nn

ect

e
d

f
o
r

23
0V-

Ra

t
e
di

np

ut
p
ow

e
r
:4

0

0

VA

Th

i
s
a

p
p
a

ra
tu

s
m

u
s

t
b
ee

a
r
t

h
e
d

War

ni

ng

2

1

3

4

Mic

/L

ine

M

ic

/
L
in

e

C
D

L

R

Au

x

Lin

e
O

u

t1V

In

c

O
u

t

I
n

Te

l/Eme

r
.

0

02

C
h

ime

4.5

1

--3

Call/Mix
direct out
100/ 70 V

Zone 1

100/ 70 V

Zone 2

100/ 70 V

Call Only
100/ 70 V

8 Ohm

Mix Only
100/ 70 V

Call/Mix direct out 8 Ohm

4 Ohm

4 Ohm

8 Ohm

8 Ohm

8 Ohm

8 Ohm

24VDCIn

Call/Mix

Zone1 Zone 2

Call Only Mi xOnly

100/70V/8 0 100/70V 0 100/70V 0 100/70V 0 100/70V 0

24VDCIn

Call/Mix

Zone1 Zone 2

Call Only Mi xOnly

100/70V/8 0 100/70V 0 100/70V 0 100/70V0 100/70V0

LB B1914 /10

C

all/

Mix

24VDC

I
n

Ca

ll
On

ly

Mi

xOn

ly

1
0

0
V 0

7
0

V 0

1
00

/70V

01

00
/7

0
V0

8 0

Figure 4.9

Figure 4.10

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Plena Mixer Amplifier | Installation and Operating Manual | en | 18

4.8.2Low impedance loudspeakers

Connect low impedance loudspeakers to the 8 Ohm/0 terminals. This output can deliver the rated output power
into an 8 Ohm load. Connect multiple loudspeakers in a series/parallel-arrangement to make the combined
impedance 8 Ohm or higher. Check the loudspeaker polarity for in-phase connection. Ensure that the jumper(s) for
loudspeaker voltage selection is / are properly set (see §2.5).

4.9 Mains connection

Figure 4.11

Use the supplied mains cord to connect the system to the mains supply.

Note

If necessary set the switch 115/230 V to the required voltage using a sharp object, e.g. a small screwdriver.

115V/230V

Apparatus delivered
connected for230V-

Rated input
power : 400VA

This apparatus mustbeearthed

Warning

IGN&QUALITY

HOLLAND

24VDCIn

Call

Only MixOnly

0

100/70V

0

115V/230V

Appa

ratusd

e
live

red

conn

e
ct

edf

o
r

2
30

V

-

Ratedin

put

power:

4
0
0

VA

Thisappa

r

a
t
usmustb

e

e
a

rthed

W

a

rn
i

n
g

2

1

3

4

Mi

c/

L
ine

M

i
c/Line

CD

L

R

Aux

LineOut1V

I
nc

Ou

t

In

Tel

/
Emer.
0

0 2

Chi

me

4.5

1--3

Ca

l
l/Mix

2
4V

D

C
In

Call

On
l

y

MixOn

l

y

100V 07

0
V 0

1
00/70

V0

100/70

V0

8 0

External settings and connections

Bosch Security Systems | 2003-09 | 3922 988 92883en

Plena Mixer Amplifier | Installation and Operating Manual | en | 19

5 Operation of mixer amplifier

Figure 4.6

Use the supplied mains cord to connect the system to the mains supply.

Figure 5.1

5.1 Source selection

• Use the music source selector (8) to select one of the connected music sources.

• Use the input volume controls (3, 4, 5, 6 and 7) to balance the sound level of the microphone inputs and the
background music.

5.2 Volume and tone control

• Use the master volume control (11) to control the volume of the music/microphone mix.

• The treble and bass tone controls (9 and 10) affect the microphones as well as the music.

5.3 Zone selection (LBB1914/10 only)

• Use the zone selection buttons (12 and 13) to route the music/microphone mix from the amplifier output to
loudspeaker zone 1 and/or loudspeaker zone 2. Priority announcements, however, are always routed to both
zones, irrespective of the position of the zone selection buttons.

Operation of mixer amplifier

3

0dB

-6 dB

-20 dB

Power

1

4

2

Line

CD AUX

Master Zone 1 Zone 2

Select

Plena Mixer Amplifier

2

1

5 6 7 10 11 12 13

3

4 8 9

Only for LBB1914/10

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6 Technical data

6.1 Electrical

Mains voltage 230/115 Vac, ±10%, 50/60 Hz
Max mains power consumption

LBB1903/10 100 VA
LBB1906/10 200 VA
LBB1912/10, LBB1914/10 400 VA

Max mains inrush current

LBB1903/10 4.5 A/9 A (230/115 Vac)
LBB1906/10 5 A/10 A (230/115 Vac)

LBB1912/10, LBB1914/10 8 A/16 A (230/115 Vac)
Battery voltage 24 Vdc, +20%/-10%
Max battery current

LBB1903/10 1.6 A
LBB1906/10 3 A
LBB1912/10, LBB1914/10 6 A

6.2 Performance

Frequency response 50 Hz - 20 kHz (+1/-3 dB @ -10 dB ref. rated output)
Distortion < 1% @ rated output, 1 kHz
Bass control -8/+8 dB @ 100 Hz
Treble control -8/+8 dB @ 10 kHz

6.3 Inputs

Input 1 (5-pin DIN, balanced with phantom power, 6.3 mm phone jack)
Input 2 (3-pin XLR, balanced with phantom power, 6.3 mm phone jack)

Sensitivity 1 mV
Impedance > 1 kOhm
S/N (flat at max volume) 63 dB
S/N (flat at min volume/muted) > 75 dB
CMRR > 40 dB (50 Hz - 20 kHz)
Headroom > 25 dB
Speech filter -3 dB @ 315 Hz, high-pass, 6 dB/oct
Phantom power supply 16 V via 1.2 kOhm
VOX (input 1 only) attack time 150 ms

release time 2 s

Input 3 and 4 (3-pin XLR, balanced with phantom power, 6.3 mm phone jack)

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 @ 315 Hz, high-pass, 6 dB/oct
Phantom power supply 16 V via 1.2 kOhm (microphone)

Tec hn ic al da t a

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Plena Mixer Amplifier | Installation and Operating Manual | en | 21

Music input (Cinch, 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

Emergency / telephone (Screw, balanced)

Sensitivity 100 mV - 1 V adjustable
Impedance > 10 kOhm
VOX threshold 50 mV

attack time 150 ms

release time 2 s
S/N (flat at max volume) > 65 dB

Interconnection (Cinch)

Nominal level 1 V
Impedance > 10 kOhm

6.4 Outputs

Master output 1 (3-pin XLR, balanced)

Nominal level 1 V
Impedance < 100 Ohm

Tape output (Cinch, 2x mono)

Nominal level 350 mV
Impedance 1.5 kOhm

Interconnection (Cinch)

Nominal level 1 V
Impedance < 100 Ohm

Loudspeaker outputs (Screw, floating)

Max/rated output power 70/100 V

LBB1903/10 45 W/30 W
LBB1906/10 90 W/60 W
LBB1912/10, LBB1914/10 180 W/120 W

8 Ohm output

LBB1903/10 16 V (30 W)
LBB1906/10 22 V (60 W)
LBB1912/10, LBB1914/10 31 V (120 W)

Output power @ 24 V battery operation -1 dB ref. rated power

6.5 Environmental conditions

Operating temperature range -10 to +45 °C
Storage temperature range -40 to +70 °C
Relative humidity < 95%

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Bosch Security Systems | 2003-09 | 3922 988 92883en

Plena Mixer Amplifier | Installation and Operating Manual | en | 22

6.6 General

EMC emission acc. to EN 55103-1
EMC immunity acc. to EN 55103-2
Acoustic noise level of fan < 40 dB SPL @ 1 m (LBB1912/10 and LBB1914/10 only)
Dimensions 100 x 430 x 270 mm (19” wide, 2U high)
Weight

LBB1903/10 approx. 5 kg
LBB1906/10 approx. 8.5 kg
LBB1912/10, LBB1914/10 approx. 10.5 kg

19” mounting brackets LBC1901/00 (to be ordered separately)

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For more information visit

www.boschsecuritysystems.com

© Bosch Security Systems B.V.

Data subject to change without notice

2003-09 | 3922 988 92883en