Bosch LBB 1968 Manual de usuario descargar pdf (Pagina 9)

36 | Plena Range

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Communication

LBB 193x/x0 Plena Booster

Amplifier

The Plena series offers three types of booster amplifier:

the LBB 1930/x0 is a 120 W booster amplifier,

the LBB 1935/x0 is a 240 W booster amplifier and the

LBB 1938/00 is a very powerful 480 W booster amplifier.

These are high-performance mono amplifiers capable of fulfilling

a wide variety of public address requirements at a surprisingly

low cost. The LBB 1930/x0 and LBB 1935/x0 use the same

compact 19", 2U high housing for table-top use and rack

mounting, while the LBB 1938/00 comes in a 19”, 3U high

housing for table-top use and rack mounting.

Features

• 120 W, 240 W and 480 W booster amplifiers in a compact

housing

• 70 V/100 V and 8 ohm outputs

• Balanced line inputs and loop-through outputs

• 100 V input for slave operation on 100 V speaker line

• Temperature controlled fan for high reliability

• Mains and battery back-up operation

Functions

The amplifiers are protected against overload and short circuits.

A temperature-controlled fan ensures high reliability at high

output power and low acoustic noise at lower power output.

Additionally, all booster amplifiers have an overheat protection

circuit that switches off the power stage if the internal

temperature reaches a critical limit due to poor ventilation or

overload. On the LBB 1938/00 this is shown by the front panel

overheat indicator.

The LBB 1930/x0 and LBB 1935/x0 has a balanced input and a

loop-through connector for easy connection of multiple booster

amplifiers to increase the available output power.

The LBB 1938/00 has two balanced inputs with priority control,

each with a loop-through facility. This allows for easy and

automatic switching between e.g. a local music source and a

priority announcement from a remote system. An additional

100 V line input is provided to connect the booster amplifiers to

a 100 V loudspeaker line, for additional output power e.g. on

remote locations.

Sensitivity or level control is located on the rear of the unit to

avoid accidental setting change. A VU-meter with LED-bar

shows the output level.

The amplifiers have 70 V and 100 V outputs for constant voltage

loudspeaker systems and a low impedance output for 8 Ohm

loudspeaker loads.

The LBB 1938/00 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.

The booster amplifiers operate both on mains power and on a

24 V battery power supply for emergency back-up, with

automatic switchover.

The LBB 1938/00 has a front panel LED that indicates when the

unit is battery operated.

Parts Included

Certifications and Approvals

Quantity Component

1 LBB 193x Plena Booster Amplifier

1 19" mounting brackets

1 Power cord

EMC emission acc. to EN 55103-1

EMC immunity acc. to EN 55103-2

1 2 3 4 5 6 7 8 9 10 11 12 13 14 ... 25 26

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Bosch LBB 1968 Manual de usuario Pagina 9

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