Product Description

• The LBD 193x amplifiers are powerful power amplifier in a 2U high 19”case (3U housing for LBD 1938) for rack mounting or tabletop use

• The Bosch Plena power amplifier series with its varied amplification range fulfills a wide variety of public address requirements at a surprisingly low cost

• The LBD193x amplifiers feature colorful LED bar on the front side to indicate the acoustic level of the signal in dB

• LBD193x amplifiers have 100V input for slave operation of the amplifier, XLR loop in and loop through facility for ease of installation and 100V output as well as 70V output for connecting to the loudspeakers with line matching transformers,8ohm and 4ohm outputs for connecting to the Low impedance speakers

• The output voltage can be selected between 100V and 70V internally

• Additionally LBD1938/00 amplifier features a dual XLR inputs with priority switching

• Gain or level control is located on the rear of the unit to avoid accidental setting change

• The amplifier works on 24VDC power supply during emergency situations

• Features

• Wide range of power amplifier from 120W,240W and 480W

• Multiple outputs - 70 V / 100 V and 8/4 ohm

• Temperature controlled forced front to back ventilation, directly stackable

• Mains, battery back-up, and pilot tone supervision

• Dual inputs with priority switching (LBD1938)

• 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,if the internal temperature reaches a critical limit due to poor ventilation or overload

• 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 100V line input is provided to connect the amplifier to a 100V 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 70V and 100V outputs for constant voltage loudspeaker systems,and a low impedance output for 8 ohm or 4 ohm loudspeaker loads

• LBD1938 amplifier also has priority controlled 100V outputs which can be used to route audio coming into priority and program inputs to the loudspeaker

• The LBD1938/00 amplifier has priority input and program input on the rear which can be used for routing important or emergency announcements when the amplifier is being used as a independent amplifier(ex: with local music source connected to program input)

• There are Priority input enable and Program input enable pins which are default off and default on respectively,when these enabled by a 24VDC signal then the respective inputs are activated

• Whenever the priority enable input is supplied with continuous 24VDC signal,the program input is over-rided by the priority input

• Note*Actual product image may vary from that shown on the picture

Product Specification

Brand	Bosch
Product Type	Amplifier
Product Model	LBD1930/00
Power Supply
Input Voltage	230VAC ±10% at 50/60Hz or 24VDC ±10%
Inrush current	8A at 230 VAC, 6A at 24 VDC
Performance
Rated Output(RMS)	120W
Power Reduction On Backup Power	-1 dB
Frequency Response	60 Hz to 18 kHz ( 1 / -3 dB at -10 dB ref. rated output)
Distortion	<1% at rated power,1kHz
S/N (Flat At Maximum Volume)	> 65 dB
Power Consumption
Maximum Power Consumption	400 VA
Mains Operation
Maximum Power	274W
-3 dB	193W
Pilot Tone	41W
Idle	18W
24V DC Operation
Maximum Power	7.0A (168W)
-3 dB	6.0A (144W)
Pilot Tone	0.9A (22W)
Idle	0.1A (2.4W)
Line Inputs	2 x
Connector	3-pin XLR, balanced
Sensitivity	1 V
Impedance	>20k ohm
CMRR	>25 dB (50 Hz to 20 kHz)
Gain	40 dB
100V Input
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