LBB 1925/10 Plena System Pre-Amplifier

Communications Systems | LBB 1925/10 Plena System Pre-Amplifier
LBB 1925/10 Plena System Pre-Amplifier
www.boschsecurity.com
The Plena system pre-amplifier is a versatile, highperformance 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 (sixzone), 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.
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.
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 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.
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).
2 | LBB 1925/10 Plena System Pre-Amplifier
Each zone has a tri-state control on the front panel
that can turn it off, switch it to the call channel, or to
the BGM channel. The all‑call microphone input and
emergency activation override the call station
selection on the call channel. Each zone has separate
priority overrides with preset volume levels. This
assures an appropriate message volume, independent
of any local volume settings, such as for BGM. Both
three‑wire and four‑wire override schemes are
supported. An override also activates a voltage-free
contact (call-active) available for external control and
monitoring. The master output channel, or one of the
input channels, can be monitored through the
headphone connector and/or the LED VU‑meter.
Controls and indicators
Front
•
•
•
•
•
•
•
•
•
LED power meter
Power on LED
Call active LED
Three knobs for mic/line volume, treble, and bass
levels
Three knobs for BGM volume, treble, and bass levels
BGM source selection knob
Six zone-selections keys
Six zone status LEDs
On/off switch
Back
• EMG input volume control
• Mains voltage switch
Interconnections
Front
Certification
Europe
CE
Installation/configuration notes
LBB 1925/10 rear view
Parts included
Quantity
Component
1
LBB 1925/10 PLENA System Pre-amplifier
1
Power cord
1
Set of 19”mounting brackets
1
Plena CD
1
Installation and User Instructions
Technical specifications
Electrical
Mains power supply
• Headphone jack
Back
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
Region
One (DIN or XLR) Mic/line input
Two (DIN/DIN) call station inputs
PC audio (cinch) input
Priority input
Master (XLR) output
BGM (XLR) output
Emergency signal input
Two trigger inputs
RS-232 (DE-9)
Three (cinch) CD, tape, aux inputs
Six 100 V speaker outputs
24 VDC output
24 VDC input
Three control inputs
Ground screw
IEC mains socket
Certifications and approvals
Safety
acc. to EN 60065
Immunity
acc. to EN 55103-2
Emission
acc. to EN 55103-1
Voltage
230/115VAC, ±15%, 50/60 Hz
Current inrush
230/115 VAC, 1.5/3 A
Max power consumption
25 VA
Battery power supply
Voltage
24 VDC, +10% / -15%
Current max
1A
Performance
Frequency response
50 Hz to 20 kHz (+1 / -3 dB)
Distortion
<0.5%
Bass control
±10 dB @ 100 Hz
Treble control
±10 dB @ 10 kHz
Channel separation
>70 dB @ 1 kHz
Priority mute
>40 dB
Dynamic range
100 dB
Mic/line input
1x
Connectors
5‑pin DIN, 3‑pin XLR, balanced, with
phantom power
Sensitivity
1 mV (mic), 200 mV (line)
3 | LBB 1925/10 Plena System Pre-Amplifier
Impedance
>1 kohm (mic); >5 kohm (line)
Connector
3-pin XLR, balanced
S/N (flat at max volume)
>63 dB (mic); >70 dB (line)
Nominal level
200 mV
S/N (flat at min volme/muted)
>75 dB
Impedance
<100 ohm
CMRR
>40 dB (50 Hz – 20 kHz)
Relay contacts
30 V, 1 A
Headroom
>25 dB
DC supply output voltage
24 V, 250 mA max
Speech filter
-3 dB @ 315 Hz, high-pass,
6 dB/oct
Mechanical
Phantom power supply
16 V via 1.2 kohm, (mic mode only)
Line input
Dimensions (H x W x D)
100 x 430 x 270 mm
(19" wide, 2U high)
3x
Weight
Approx. 5 kg
Connector
Cinch, stereo converted to mono,
unbalanced
Mounting
Standalone, 19" rack
Sensitivity
200 mV
Color
Charcoal
Impedance
22 kohm
Environmental
S/N (flat at max volume)
>70 dB
Operating temperature
-10 ºC to +55 ºC (14 ºF to +131 ºF)
S/N (flat at min volume/
muted)
>75 dB
Storage temperature
-40 ºC to +70 ºC (-40 ºF to
+158 ºF)
Headroom
>25 dB
Relative humidity
<95%
Master output
1x
Ordering information
Connector
3-pin XLR, balanced
Nominal level
1V
Impedance
<100 ohm
Tape output
1x
Connector
Cinch, 2 x mono
Nominal level
350 mV
Impedance
<1 kohm
Headphone output
1x
Connector
6.3 mm jack stereo, signal mono
Nominal level
3V
Impedance
<100 ohm
Zone relays
5A
Contacts voltage
250 V
Contacts current
8A
Interconnection input /
emergency
1x
Connector
3-pin XLR, balanced
Sensitivity
200 mV (interconnection),
100 mV to 1 V adjustable
(emergency)
Impedance
>10 kohm
VOX threshold
45 mV (emergency)
Interconnection output
1x
LBB 1925/10 Plena System Pre-Amplifier
6-zone, 2-channel distribution system unit with call
and BGM (background music)
Order number LBB1925/10
4 | LBB 1925/10 Plena System Pre-Amplifier
Represented by:
Americas:
Bosch Security Systems, Inc.
12000 Portland Avenue South
Burnsville MN 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
5617 BA Eindhoven, The Netherlands
Phone: + 31 40 2577 284
Fax: +31 40 2577 330
emea.securitysystems@bosch.com
www.boschsecurity.com
© Bosch Security Systems 2012 | Data subject to change without notice
1886277131 | en, V1, 23. Nov 2012
Asia-Pacific:
Robert Bosch (SEA) Pte Ltd, Security
Systems
11 Bishan Street 21
Singapore 573943
Phone: +65 6571 2808
Fax: +65 6571 2699
apr.securitysystems@bosch.com
www.boschsecurity.asia
China:
America Latina:
Bosch (Shanghai) Security Systems Ltd. Robert Bosch Ltda Security Systems Division
201 Building, No. 333 Fuquan Road
Via Anhanguera, Km 98
North IBP
CEP 13065-900
Changning District, Shanghai
Campinas, Sao Paulo, Brazil
200335 China
Phone: +55 19 2103 2860
Phone +86 21 22181111
Fax: +55 19 2103 2862
Fax: +86 21 22182398
al.securitysystems@bosch.com
www.boschsecurity.com.cn
www.boschsecurity.com