Bosch LBB1935/20 User Manual download pdf

Communications Systems | LBB 1935/20 Plena Power Amplifier

LBB 1935/20 Plena Power Amplifier

www.boschsecurity.com

u 240 W power amplifier in a 2U high housing

u EN 54‑16 certified and EN 60849 compliant

u 70 V / 100 V and 8 ohm outputs

u Dual inputs with priority switching

u 100 V input for slave operation on 100 V speaker

line

The LBB 1935/20 is a powerful 240 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 1935/20 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.

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Summary of Contents

Page 1

Communications Systems | LBB 1935/20 Plena Power AmplifierLBB 1935/20 Plena Power Amplifier www.boschsecurity.com u 240 W power amplifier in a 2U h

Page 2

Controls and indicatorsFront• Meter (LED's for -20, -6, 0 dB and Power ON)• Battery operation indicator• Overheat indicatorBack• Level control in

Page 3 - LBB1935/20

-3 dB 11.4 A (274 W)-6 dB 8.1 A (194 W)Pilot tone* 1.7 A (41 W)Idle 0.3 A (7 W)* 20 kHz -20dB with maximum loudspeaker loadMechanicalDimensions (H x W

Bosch LBB1935/20 User Manual

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Bosch LBB1935/20 User Manual

Browse online or download User Manual for Audio amplifiers Bosch LBB1935/20. LBB 1935/20 Plena Power Amplifier [en]

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