Bosch LBB 1968 Manual de usuario descargar pdf (Pagina 5)

32 | Plena Range

www.boschsecurity.com

Communication

LBB 1920/00 Plena Universal Pre-

Amplifier

The Plena Pre-Amplifier is a high-performance, versatile four-

input channel mono mixer pre-amplifier, capable of fulfilling a

wide variety of public address requirements.

Features

• Four universal low-noise input channels for microphone or line

• Separate tone control, speech filter and direct output per

channel

• Selectable blocking, serial and mixing priorities

• Multifunctional inter-connection point

• Priority and emergency relay outputs

• Master volume control

Functions

All input channels provide a choice of a balanced 3-pin XLR-

connector for microphone or line level (selectable), a balanced

5-pin DIN-connector for microphone or line level with priority

contact, or a line level stereo cinch-connector, converted to

mono. Microphone inputs have a phantom power supply. Each

input channel has its own volume and tone control, a selectable

speech filter to reduce the bass content of the speech signal for

improved intelligibility, and a balanced direct output on XLR after

the channel controls.

Three priority modes are available for the input channels. In the

blocking mode the input channel that is activated first gets

priority over all other input channels. In the serial mode input

channel 1 has priority over channels 2, 3 and 4, channel 2 has

priority over channels 3 and 4, and channel 3 has priority over

channel 4. Each of the input channels can be mixed to the

master output, irrespective of priority, by separately setting that

channel to the mixing mode.

Balanced XLR interconnection input and output are provided in

combination with an insertion/cascade selector. In insertion

mode an external sound processing device, e.g. an equalizer,

can be connected between these connections. In the cascade

mode, multiple LBB1920/00 pre-amplifiers can be cascaded to

increase the number of input channels to 8, 12, or even more.

Internally the interconnection input can be switched as an

emergency input with a signal level detector (VOX). If an

emergency audio signal is detected, this input overrules all other

inputs and even bypasses the master volume control. The

emergency input has its own internal volume preset.

In order to get a message through (although the local volume

may be set to a low volume level for e.g. background music),

override relay contacts are provided for overriding local

loudspeaker volume controls. Upon closing one of the input

channel priority contacts, this relay will be activated. For the

emergency input another VOX activated relay is provided to

trigger external equipment or for local volume control override.

An overload protected 24 VDC output is available to supply

power to external relays, so no additional external power supply

is required.

In parallel to the balanced XLR master output an additional

microphone level output is available on DIN. This provides a

signal to e.g. a mixing desk or microphone mixer amplifier.

A tape output is also available.

A monitor selector with headphone connector and

LED VU-meter allows for monitoring of the master output or one

of the input channels.

Parts Included

Certifications and Approvals

Quantity Component

1 LBB 1920/00 Plena Universal Pre-amplifier

1 Power cord

1Plena CD

1 19”mounting brackets

EMC emission acc. To EN 55103-1

EMC immunity acc. To EN 55103-2

1 2 3 4 5 6 7 8 9 10 ... 25 26

Comentarios a estos manuales

Sin comentarios

Bosch LBB 1968 Manual de usuario Pagina 5

Comentarios a estos manuales

Relacionado con productos y manuales para Los Sistemas De Control De Acceso De Seguridad Bosch LBB 1968