Bosch Appliances Stereo Amplifier LBB 1925 10 User Manual

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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