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2 | LBB 1938/20 Plena Power Amplifier
Controls and indicators
Front
• Meter (LED's for -20, -6, 0 dB and Power ON)
• Battery operation indicator
• Overheat indicator
• Air inlet for forced air cooling
Back
• Level control input 1
• Level control input 2
• Power button
• Mains switch
Interconnections
Back
• 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
Region
Certification
Europe
CE
CPD
Poland
CNBOP
Parts included
Quantity
Component
1
LBB 1938/20 Plena Power Amplifier
1
Power cord
1
Set of 19" mounting brackets
1
Installation and User Instructions
Technical specifications
Electrical
Mains power supply
Voltage
Inrush current
Max power consumption
230 VAC, ±10%, 50/60 Hz
19 A
2200 VA
Battery power supply
Voltage
Current max
Performance
Output power (rms/maximum)
Power reduction on backup
power
Frequency response
Distortion
S/N (flat at max volume)
Line inputs
Connector
Sensitivity
Impedance
CMRR
Gain
100 V input
Connector
Sensitivity
Impedance
Line loop-through output
Connector
Nominal level
Impedance
Loudspeaker outputs
Connector
Direct output
Priority only (from input 1)
Music (non-priority) only
Power consumption
Mains operation
Max power
-3dB
-6dB
Pilot tone*
Idle
24 VDC operation
Max power
24 VDC +15% / -15%
30 A
480 W / 720 W
-1 dB
50 Hz to 20 kHz (+1/‑3 dB @ ‑10 dB
ref. rated output)
<1% @ rated output power, 1 kHz
>90 dB
2 x
3-pin XLR, balanced
1 V
20 kohm
>25 dB (50 Hz to 20 kHz)
40 dB
Screw, unbalanced
100 V
330 kohm
2 x
3-pin XLR
1 V
Direct connection to line input
3 x
Screw, floating
100 V, 70 V, 8 ohm
100V or 70 V internally selectable
100V or 70 V internally selectable
990 W
715 W
510 W
110 W
25 W
32 A (770 W)
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