Bosch Appliances Stereo Amplifier LBB 1938/20 User Manual

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

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

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

Europe

CE

CPD

Poland

CNBOP

Quantity

Component

1

LBB 1938/20 Plena Power Amplifier

1

Power cord

1

Set of 19" mounting brackets

1

Installation and User Instructions

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

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