Bosch LBB19XX User Manual

Communication Systems | LBB 19xx/10 Plena Mixer Amplifiers

LBB 19xx/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

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Separate overruling emergency input with vox

▶

Loudspeaker connections for normal, call-only and

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mix-only zones
Choice of CD, tuner or auxiliary music inputs

▶

The Plena mixer amplifier is a high-performance,
versatile four-microphone inputs mono mixer amplifier,
capable of fulfilling a wide variety of public address
requirements at surprisingly low cost.

Functions

All microphone inputs have a phantom power supply to
provide power to condenser microphones and
selectable speech filters for improved intelligibility.
Microphone inputs 3 and 4 can also be switched to line
sensitivity. Furthermore, separate music inputs are
available with their own input selector and volume
control.
Microphone input 1 can be given priority over all other
microphone and music inputs. Priority is given upon
contact closure on the 5-pin DIN connector or if the
signal level on input 1 exceeds a predefined value (VOX).
A 2-tone chime can be selected to precede a priority
announcement.
A telephone or emergency input with VOX activation is
provided that takes overall priority, and has its own
preset volume control.
An interconnection input and output enables external
sound processing equipment to be connected, such as
an equalizer or the Plena feedback suppressor between
the preamplifier section and the power amplifier. A tape

output is provided and a LED VU-meter allows the
master output to be monitored.
The Plena mixer amplifiers come in a range of output
powers. This power is directly available on 70 V and 100
V constant voltage outputs and on a low impedance
output for 8 ohm load. Moreover, the amplifiers have a
separate 70 V / 100 V Call Only output for addressing
areas where only priority announcements are required,
and a 70 V / 100 V Mix Only output for areas where no
priority announcements should be heard. The Call Only
output can also be used for 3-wire remote volume
control override.
Additional Plena power amplifiers can be connected in
a loop-through arrangement to the balanced line output
if more output power is needed than the built-in power
stage can deliver.
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 if some announcements or background music
should only be heard in part of a building. Priority calls,
however, are always routed to both zones, even if
unselected for e.g. music.

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2 | LBB 19xx/10 Plena Mixer Amplifiers

Certifications and Approvals

EMC emission acc. to EN 55103-1
EMC immunity acc. to EN 55103-2

Parts Included

Quantity Components
1 LBB 19xx Plena Mixer Amplifier
1 Power cord

Technical Specifications

Electrical

Mains Voltage 115 Vac/230 VAC,

±10%, 50/60 Hz
Max mains power consumption
LBB 1903/10 100 VA
LBB 1906/10 200 VA
LBB 1912/10, LBB 1914/10 400 VA
Max mains inrush current
LBB 1903/10 4.5 A/9 A (230 Vac/115 VAC)
LBB 1906/10 5 A/10 A (230 Vac/115 VAC)
LBB 1912/10, LBB 1914/10 8 A/16 A (230 Vac/115 VAC)
Battery Voltage 24 VDC, +20%/-10%
Max battery 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 – 20 kHz (+1/-3 dB,

@ -10 dB ref. rated output)
Distortion <1% @ rated output power,

1 kHz
Bass Control -8/+8 dB @ 100 Hz
Treble Control -8/+8 dB @ 10 kHz
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 (50Hz-20kHz)
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 3,4 (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)
Dynamic Range 100 dB
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, 6dB/oct

LBB 19xx/10 Plena Mixer Amplifiers | 3

Phantom Power Supply 16 V via 1.2 kOhm (microphone)
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
Outputs
Master Output (3-pin XLR, balanced)
Nominal Level 1 V
Impedance <100 ohm
Tape Output (Cinch, 2 x 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
LBB 1903/10 45 W / 30 W
LBB 1906/10 90 W / 60 W
LBB 1912/10, LBB 1914/10 180 W / 120 W
8 Ohm Output
LBB 1903/10 16 V (30 W)
LBB 1906/10 22 V (60 W)
LBB 1912/10, LBB 1914/10 31 V (120 W)
Output power @ 24 V battery -1 dB ref. rated power

Environmental

Weight
LBB 1903/10 approx. 5 kg
LBB 1906/10 approx. 8.5 kg
LBB 1912/10, LBB 1914/10 approx. 10.5 kg
19" Mounting Brackets LBC 1901/00 to be ordered sepa-

rately

Ordering Information

Model | Description
LBB 1903/10 Plena Mixer Amplifier

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

LBB 1906/10 Plena Mixer Amplifier

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

LBB 1912/10 Plena Mixer Amplifier

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

LBB 1914/10 Plena Mixer Amplifier

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

Operating Temperature -10°C to +45ºC
Storage Temperature -40°C to +70ºC
Relative Humidity <95%
Acoustic Noise Level of Fan <40 dB SPL @ 1m

(LBB 1912/10 & LBB 1914/10)
Dimensions (WxH) 100 x 430 x 270 mm (19", 2U)

Americas:
Bosch Security Systems
130 Perinton Parkway
Fairport, New York, 14450, USA
Phone: [phone]
Fax: [phone]
[e-mail]
www.boschsecurity.us

© Bosch Security Systems, 2005 | Data subject to change without notice | 12. Dec. 2005

Europe, Middle East, Africa:
Bosch Security Systems B.V.
P.O. Box 80002
5600 JB Eindhoven, The Netherlands
Phone: [phone]
Fax: [phone]
[e-mail]
www.boschsecurity.com

Asia-Pacific:
Bosch Security Systems Pte Ltd
38C Jalan Pemimpin
Singapore 577180
Phone: [phone]
Fax: [phone]
[e-mail]
www.boschsecurity.com

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