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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 230 VAC, ±10%, 50/60 Hz
Inrush current 19 A
Max power consumption 2200 VA
Battery power supply
Voltage 24 VDC +15% / -15%
Current max 30 A
Performance
Output power (rms/maximum) 480 W / 720 W
Power reduction on backup
power
-1 dB
Frequency response 50 Hz to 20 kHz (+1/‑3 dB @ ‑10 dB
ref. rated output)
Distortion <1% @ 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) 100V or 70 V internally selectable
Music (non-priority) only 100V or 70 V internally selectable
Power consumption
Mains operation
Max power 990 W
-3dB 715 W
-6dB 510 W
Pilot tone* 110 W
Idle 25 W
24 VDC operation
Max power 32 A (770 W)
2 | LBB 1938/20 Plena Power Amplifier