Communications Systems | LBB 1925/10 Plena System Pre-Amplifier
LBB 1925/10 Plena System Pre-Amplifier
u Six-zone system pre-amplifier, with single or dual
channel operation
u Two input channels for call stations
u Universal input for microphone/line, with speech
optimized tone control
u Three inputs for BGM selection and music optimized
tone control
u Front panel zone selection for BGM and call station
zone selection for calls
The Plena system pre-amplifier is a versatile, high-
The BGM channel provides three inputs on stereo
cinch-connectors, converted to mono, with front panel
selection, volume control and bass and treble tone
controls with shelving characteristics optimized for
music. The BGM channel has a direct output on
balanced XLR for dual channel operation. It can also
feed the master output, with the lowest priority, for
single channel operation. Zone selector switches on
the front panel control the BGM routing. An overload
protected 24 VDC output provides power for driving
external relays, often making an external power supply
unnecessary.
performance unit with call and mono BGM
(background music). It fulfills a wide variety of public
address requirements at a surprisingly low cost. It can
provide dual channel operation for simultaneous calls
and BGM for up to six different zones, using two Plena
amplifiers.
Functions
The call channel provides two inputs for the Plena call
stations, LBB 1941/00 (all-call) or LBB 1946/00 (six-
zone), with loop-through capability, and universal,
balanced input. One is a 3-pin XLR connector for
microphone or line level (selectable), and the other is
a 5-pin DIN-connector with all‑call priority contact,
which may also be used to start one of the available
chime attention signals.
An emergency/telephone input with signal level
detector (VOX) and volume preset has the highest
priority to all zones. Two trigger inputs (contact
closure) activate alarm or time signals to pre-selected
zones. Many different chime tones are available. A PC
audio input with RS-232 control provides software
controlled zone configuration, or automatic messaging
in combination with the LBB 1965/00 Plena Message
Manager. There are six levels of priority available for
BGM, microphone, call stations, trigger inputs and
emergency input. A set of relays directs the amplifier
output(s) to different loudspeaker groups (zone
switching).
The microphone input has a selectable speech filter
for improved intelligibility, a volume control, and bass
and treble tone controls with shelving characteristics
optimized for speech. The call channel is available on
the balanced XLR master output.
3 | LBB 1925/10 Plena System Pre-Amplifier
Impedance
>1 kohm (mic); >5 kohm (line)
>63 dB (mic); >70 dB (line)
>75 dB
Connector
3-pin XLR, balanced
200 mV
S/N (flat at max volume)
S/N (flat at min volme/muted)
CMRR
Nominal level
Impedance
<100 ohm
>40 dB (50 Hz – 20 kHz)
>25 dB
Relay contacts
DC supply output voltage
30 V, 1 A
Headroom
24 V, 250 mA max
Speech filter
-3 dB @ 315 Hz, high-pass,
6 dB/oct
Mechanical
Dimensions (H x W x D)
100 x 430 x 270 mm
(19" wide, 2U high)
Phantom power supply
Line input
16 V via 1.2 kohm, (mic mode only)
3 x
Weight
Mounting
Color
Approx. 5 kg
Connector
Cinch, stereo converted to mono,
unbalanced
Standalone, 19" rack
Charcoal
Sensitivity
200 mV
22 kohm
>70 dB
>75 dB
Environmental
Impedance
Operating temperature
Storage temperature
-10 ºC to +55 ºC (14 ºF to +131 ºF)
S/N (flat at max volume)
-40 ºC to +70 ºC (-40 ºF to
+158 ºF)
S/N (flat at min volume/
muted)
Relative humidity
<95%
Headroom
>25 dB
Master output
Connector
1 x
Ordering information
3-pin XLR, balanced
LBB 1925/10 Plena System Pre-Amplifier
6-zone, 2-channel distribution system unit with call
and BGM (background music)
Nominal level
Impedance
1 V
<100 ohm
Order number LBB1925/10
Tape output
Connector
1 x
Cinch, 2 x mono
Nominal level
Impedance
350 mV
<1 kohm
Headphone output
Connector
1 x
6.3 mm jack stereo, signal mono
Nominal level
Impedance
3 V
<100 ohm
5 A
Zone relays
Contacts voltage
Contacts current
250 V
8 A
Interconnection input /
emergency
1 x
Connector
Sensitivity
3-pin XLR, balanced
200 mV (interconnection),
100 mV to 1 V adjustable
(emergency)
Impedance
>10 kohm
45 mV (emergency)
1 x
VOX threshold
Interconnection output
4 | LBB 1925/10 Plena System Pre-Amplifier
Represented by:
Americas:
Europe, Middle East, Africa:
Bosch Security Systems B.V.
P.O. Box 80002
5617 BA Eindhoven, The Netherlands
Phone: + 31 40 2577 284
Fax: +31 40 2577 330
Asia-Pacific:
Robert Bosch (SEA) Pte Ltd, Security
Systems
11 Bishan Street 21
Singapore 573943
Phone: +65 6571 2808
Fax: +65 6571 2699
China:
America Latina:
Bosch Security Systems, Inc.
12000 Portland Avenue South
Burnsville MN 55337, USA
Phone: +1-800-392-3497
Fax: +1-800-955-6831
Bosch (Shanghai) Security Systems Ltd. Robert Bosch Ltda Security Systems Division
201 Building, No. 333 Fuquan Road
North IBP
Changning District, Shanghai
200335 China
Phone +86 21 22181111
Fax: +86 21 22182398
Via Anhanguera, Km 98
CEP 13065-900
Campinas, Sao Paulo, Brazil
Phone: +55 19 2103 2860
Fax: +55 19 2103 2862
© Bosch Security Systems 2012 | Data subject to change without notice
1886277131 | en, V1, 23. Nov 2012
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