Bosch | LBB1935/20 | LBB 1935/20 Plena Power Amplifier

Communications Systems | LBB 1935/20 Plena Power Amplifier
LBB 1935/20 Plena Power Amplifier
www.boschsecurity.com
The LBB 1935/20 is a powerful 240 W power amplifier
in a 2U high 19” case for rack mounting or tabletop
use. LEDs on the front panel show the status of the
amplifier: power, audio output level, and supervised
functions. This high-performance unit fulfills a wide
range of public address requirements at a surprisingly
low cost.
Functions
Dependability
The amplifier is protected against overload and short
circuits. A temperature-controlled fan ensures high
reliability at high output levels and low acoustic noise
at lower output levels. An overheat protection circuit
switches off the power stage and activates an LED on
the front panel, if the internal temperature reaches a
critical limit due to poor ventilation or overload.
The unit operates both on mains power and on a 24 V
battery power supply for emergency back up, with
automatic switchover.
For emergency and evacuation use, the following
functions are monitored: mains presence, battery
present, pilot tone presence, amplifier operation.
Front panel LEDs indicate the status of supervised
functions. The LEDs of pilot tone supervision and
u
240 W power amplifier in a 2U high housing
u
EN 54‑16 certified and EN 60849 compliant
u
70 V / 100 V and 8 ohm outputs
u
Dual inputs with priority switching
u
100 V input for slave operation on 100 V speaker
line
battery status can be switched off for general public
address use. Failsafe (normally energized) relays are
provided for each supervised function. These relays
are always active regardless of the switches on the
rear panel.
Input
The system has two balanced inputs with priority
control, each with a loop-through facility. This makes it
easy to connect remote systems that require priority
control. An additional 100 V line input is provided to
connect the amplifier to a 100 V loudspeaker line to
provide more power to remote locations.
Gain or level control is located on the rear of the unit
to avoid accidental setting change. A meter with LEDbar shows the output level.
Output
The amplifier has 70 V and 100 V outputs for constant
voltage loudspeaker systems, and a low impedance
output for 8 ohm loudspeaker loads.
The LBB 1935/20 has two separate priority controlled
100 V outputs for zones that only need
announcements made via the priority input, and for
zones that will not receive announcements made via
the priority input.
2 | LBB 1935/20 Plena Power Amplifier
Controls and indicators
Front
Battery power supply
• Meter (LED's for -20, -6, 0 dB and Power ON)
• Battery operation indicator
• Overheat indicator
Back
•
•
•
•
24 VDC +15% / -15%
Current max
11 A
Performance
Level control input 1
Level control input 2
Power button
Mains switch
Interconnections
Back
•
•
•
•
•
•
•
•
•
•
•
•
Voltage
Priority line input 1 (XLR/balanced)
Line loop-through 1 (XLR/balanced)
Program line input 2 (XLR/balanced)
Line loop-through 2 (XLR/balanced)
Priority controlled loudspeaker output terminals
24 VDC power supply terminal
Three loudspeaker direct output terminals
Two 100 V slave input terminals
Input 2 enable control terminal
Input 1 priority control terminal
Earth connection screw
Mains socket
Certifications and approvals
Safety
acc. to EN 60065
Immunity
acc. to EN 50130‑4
Emission
acc. to EN 55103-1
Emergency
acc. to EN 54‑16 / EN 60849
Output power (rms/maximum)
240 / 360 W
Power reduction on backup
power
-1 dB
Frequency response
50 Hz to 20 kHz (+1 / ‑3 dB at ‑10 dB
ref. rated output)
Distortion
<1% at rated output power, 1 kHz
S/N (flat at max volume)
>90 dB
Line inputs
2x
Connector
3-pin XLR, balanced
Sensitivity
1V
Impedance
20 kohm
CMRR
>25 dB (50 Hz to 20 kHz)
Gain
40 dB
100 V input
Connector
Screw, unbalanced
Sensitivity
100 V
Impedance
330 kohm
Line loop-through output
2x
Region
Certification
Connector
3-pin XLR
Europe
CE
Nominal level
1V
CPD
Impedance
Direct connection to line input
Loudspeaker outputs
3x
Connector
Screw, floating
Direct output
100 V, 70 V, 8 ohm
Poland
CNBOP
Parts included
Quantity
Component
1
LBB 1935/20 Plena Power Amplifier
Priority only (from input 1)
100 V or 70 V internally selectable
1
Power cord
Music (non-priority) only
100 V or 70 V internally selectable
1
Set of 19" mounting brackets
Power consumption
1
Installation and User Instructions
Mains operation
1
Cable with XLR connector
Max power
451 W
Technical specifications
-3dB
340 W
Electrical
-6dB
244 W
Mains power supply
Pilot tone*
55 W
16 W
Voltage
230 VAC, ±10%, 50/60 Hz
Idle
Inrush current
9A
24 V operation
Max power consumption
760 VA
Max power
12.1 A (290 W)
3 | LBB 1935/20 Plena Power Amplifier
-3 dB
11.4 A (274 W)
-6 dB
8.1 A (194 W)
Pilot tone*
1.7 A (41 W)
Idle
0.3 A (7 W)
* 20 kHz -20dB with maximum loudspeaker load
Mechanical
Dimensions (H x W x D)
100 x 430 x 270 mm
(19" wide, 2U high, with feet)
Weight
Approx. 12.5 kg
Mounting
Standalone, 19”rack
Color
Charcoal
Environmental
Operating temperature
-10 ºC to +55 ºC (14 ºF to +131 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)
Ordering information
LBB 1935/20 Plena Power Amplifier
240 W power amplifier in a 2U high 19” case for rack
mounting or tabletop use.
Order number LBB1935/20
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
1889043595 | en, V2, 24. 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
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