Bosch LBB 1968 Uživatelský manuál stáhnout pdf (Strana 2)

28 | Plena Range

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Communication

LBB 19xx/10 Plena Mixer

Amplifiers

The Plena mixer amplifier is a high-performance, versatile four-

microphone inputs mono mixer amplifier, capable of fulfilling a

wide variety of public address requirements at surprisingly low

cost.

Features

• Range of single and dual zone mixer amplifiers from 30 W to

120 W

• Four low-noise balanced inputs for microphone or line

• Selectable priority & vox switching on microphone input 1

• Optional 2-tone chime to precede announcements

• Separate overruling emergency input with vox

• Loudspeaker connections for normal, call-only and mix-only

zones

• Choice of CD, tuner or auxiliary music inputs

Functions

All microphone inputs have a phantom power supply to provide

power to condenser microphones and selectable speech filters

for improved intelligibility. Microphone inputs 3 and 4 can also

be switched to line sensitivity. Furthermore, separate music

inputs are available with their own input selector and volume

control.

Microphone input 1 can be given priority over all other

microphone and music inputs. Priority is given upon contact

closure on the 5-pin DIN connector or if the signal level on input

1 exceeds a predefined value (VOX).

A 2-tone chime can be selected to precede a priority

announcement.

A telephone or emergency input with VOX activation is provided

that takes overall priority, and has its own preset volume control.

An interconnection input and output enables external sound

processing equipment to be connected, such as an equalizer or

the Plena feedback suppressor between the preamplifier section

and the power amplifier. A tape output is provided and

a LED VU-meter allows the master output to be monitored.

The Plena mixer amplifiers come in a range of output powers.

This power is directly available on 70 V and 100 V constant

voltage outputs and on a low impedance output for 8 ohm load.

Moreover, the amplifiers have a separate 70 V/100 V Call Only

output for addressing areas where only priority announcements

are required, and a 70 V/100 V Mix Only output for areas where

no priority announcements should be heard. The Call Only

output can also be used for 3-wire remote volume control

override.

Additional Plena power amplifiers can be connected in a loop-

through arrangement to the balanced line output if more output

power is needed than the built-in power stage can deliver.

The LBB 1914/10 offers the same functionality as the

LBB 1912/10 but also has two front-panel switches to direct the

amplifier output to two separate zones. This is useful if some

announcements or background music should only be heard in

part of a building. Priority calls, however, are always routed to

both zones, even if unselected for e.g. music.

Parts Included

Certifications and Approvals

Quantity Components

1 LBB 19xx Plena Mixer Amplifier

1 Power cord

EMC emission acc. to EN 55103-1

EMC immunity acc. to EN 55103-2

1 2 3 4 5 6 7 ... 25 26

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