Bosch PLE-1MEXX0-XX Specifications download pdf (Page 37)

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PA and Emergency Sound | Plena Public Address Solutions | 37

LBB 1938/20 Plena Power

Amplifier

Features

▶

480 W power amplifier in a 3U high 19”housing

▶

70 V / 100 V and 8 ohm outputs

▶

Dual inputs with priority switching

▶

100 V input for slave operation on 100 V speaker line

▶

Temperature controlled forced front to back

ventilation, directly stackable

▶

Mains, battery back-up, and pilot tone supervision

▶

EN 54‑16 and EN 60849 compliant

The LBB 1938/20 is a powerful 480 W power amplifier in a

3U 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 1938/20 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 get any

announcements made via the priority input.

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

Region Certification

Europe CE

Poland CNBOP

www.boschsecurity.com Bosch Security Systems B.V.

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