Bosch F.01U.024.955 Datasheet
Communications Systems | LBB 1930/20 Plena Power Amplifier
LBB 1930/20 Plena Power Amplifier
120 W power amplifier in a compact housing
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70 V / 100 V and 8 ohm outputs
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Dual inputs with priority switching
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100 V input for slave operation on 100 V speaker line
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Temperature controlled forced front to back
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ventilation, directly stackable.
Mains, battery back-up and pilot tone supervision
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EN 54‑16 and EN 60849 compliant
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The LBB 1930/20 is a powerful 120 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 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 LED-bar
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 1930/20 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.
Controls and indicators
Front
Meter (LED's for -20, -6, 0 dB and Power ON)
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Battery operation indicator
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Overheat indicator
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2 | LBB 1930/20 Plena Power Amplifier
Back
Level control input 1
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Level control input 2
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Power button
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Mains switch
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Interconnections
Back
Priority line input 1 (XLR/balanced)
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Line loop-through 1 (XLR/balanced)
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Program line input 2 (XLR/balanced)
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Line loop-through 2 (XLR/balanced)
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Priority controlled loudspeaker output terminals
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24 VDC power supply terminal
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Three loudspeaker direct output terminals
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Two 100 V slave input terminals
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Input 2 enable control terminal
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Input 1 priority control terminal
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Earth connection screw
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Mains socket
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Certifications and Approvals
Region Certification
Europe CE
Poland CNBOP
Safety acc. to EN 60065
Immunity acc. to EN 55103-2
Emission acc. to EN 55103-1
Emergency acc. to EN 54‑16 / EN 60849
Parts Included
Quantity Component
1 LBB 1930/20 Plena Power Amplifier
1 Power cord
1 Set of 19" mounting brackets
1 Installation and User Instructions
1 Cable with XLR connector
Technical Specifications
Electrical
Mains power supply
Voltage 230 VAC ±10%, 50/60 Hz
Inrush current 8 A
Max power consumption 400 VA
Battery power supply
Voltage 24 VDC +15% / -15%
TUV certificate IEC60849
Mains power supply
Current max 6 A
Performance
Output power (rms/maximum) 120 / 180 W
Power reduction on backup
power
Frequency response 50 Hz to 20 kHz (+1 / -3 dB at -10 dB
Distortion <1% at rated output power, 1 kHz
S/N (flat at max volume) >90 dB
Line inputs 2 x
Connector 3-pin XLR, balanced
Sensitivity 1 V
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 2 x
Connector 3-pin XLR
Nominal level 1 V
Impedance Direct connection to line input
Loudspeaker outputs 3 x
Connector Screw, floating
Direct output 100 V, 70 V, 8 ohm
Priority only (from input 1) 100 V or 70 V internally selectable
Music (non-priority) only 100 V or 70 V internally selectable
Power consumption
Mains operation
Max power 274 W
-3dB 193 W
-6dB 143 W
Pilot tone* 41 W
Idle 18 W
24 VDC operation
Max power 7.0 A (168 W)
-3 dB 6.0 A (144 W)
-6 dB 4.3 A (103 W)
Pilot tone* 0.9 A (22 W )
Idle 0.1 A (2.4 W)
* 20 kHz -20dB with maximum loudspeaker load
-1 dB
ref. rated output)
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