System Overview; Product Range Introduction; Power Amplifier Range - Bosch PLENA LBB1938/30 Installation And Operation Manual

PLENA power amplifiers
3

System Overview

3.1

Product range introduction

The Power Amplifier is part of the Plena product range. The Plena product range provides
public address solutions for places where people gather to work, worship, trade, or to relax. It
is a family of system elements that are combined to create public address systems tailored for
virtually any application. The Plena product range includes:
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The various elements are designed to complement each other using matched acoustical,
electrical and mechanical specifications.
All Plena Power Amplifiers in this manual are designed for use in EN54‑16 and EN60849
compliant systems.
3.2

Power amplifier range

The Plena Power Amplifier range consists of the following mono amplifiers:
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In this manual all illustrations show either the LBB1938/x0 power amplifier that is 3 units high
or the LBB1930/20 and LBB1935/20 power amplifiers that are 2 units high. All connections
are similar between the different power amplifiers. These power amplifiers have 70V and 100V
constant voltage outputs and a low impedance output for 4 or 8 Ohm loudspeakers.
Two inputs, "Priority" and "Program", give priority and controlled outputs. A 100V slave input
gives connection to existing loudspeaker lines. The line inputs are balanced and have a
loop‑through facility. The amplifiers have overload and short‑circuit protection. A temperature
controlled fan and overheat protection gives high reliability. Battery operation with automatic
switchover from the mains supply is available.
Bosch Security Systems B.V.
Mixers
Pre‑amplifiers
Power amplifiers
Music source unit
Digital message manager
Feedback suppressor
Call stations
"All-In-One" system
Voice Alarm System
Timer
Charger
Loop amplifier
120W LBB1930/20 (2 units high).
240W LBB1935/20 (2 units high).
480W LBB1938/x0 (3 units high).
Installation and operation manual
System Overview | en 7
2018.11 | V1.2 | LBB193x/x0