LBB 1903/10
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)
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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: +1-800-392-3497
Fax: +1-800-955-6831
audiosupport@us.bosch.com
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: +31 40 2577 330
emea.securitysystems@bosch.com
www.boschsecurity.com
Asia-Pacific:
Robert Bosch (SEA) Pte Ltd
11 Bishan Street 21
Singapore 573943
Phone: +65 6571 2600
Fax: +65 6571 2698
apr.securitysystems@bosch.com
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
Bosch Security Systems | 2003-09 | 3922 988 92883en
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.
Bosch Security Systems | 2003-09 | 3922 988 92883en
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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