Bosch LBB 1920 User Manual

Plena Universal Pre-amplifier

Installation and Operating Manual

LBB 1920

en

Plena Universal Pre-amplifier | Installation and Operating Manual | Important safeguards en | 3

Important safeguards

1 Read instructions - All the safety instructions for use

should be read before the system is operated.

2 Retain instructions - The safety instructions and

instructions for use should be retained for future
reference.

3 Heed warnings - All warnings on the unit and in the

operating instructions should be adhered to.

4 Follow instructions - All operating instructions and

instructions for use should be followed.

5 Cleaning - Unplug system units from the mains outlet

before cleaning. Do not use liquid cleaners or aerosol
cleaners. Use a damp cloth for cleaning.

6 Attachments - Do not use attachments not

recommended by the product manufacturer as they may
cause hazards.

7 Water and Moisture - Do not use this unit near water, for

example near a bathtub, washbowl, kitchen sink, or
laundry basket, in a wet basement, near a swimming
pool, in an unprotected outdoor installation or any area
which is classified as a wet location.

8 Accessories - Do not place this unit on an unstable stand,

tripod, bracket or mount. This unit may fall, causing
serious injury to a person and serious damage to the
unit. Use only a stand, tripod, bracket or mount
recommended by the manufacturer, or sold with the
product. Any mounting of the unit should follow the
manufacturer's instructions, and should use a mounting
accessory recommended by the manufacturer. An
appliance and cart combination should be moved with
care. Quick stops, excessive force, and uneven surfaces
may cause the appliance and cart combination to
overturn.

9 Ventilation - Openings in the enclosure, if any, are

provided for ventilation and to ensure reliable operation
of the unit and to protect it from overheating. These
openings must not be blocked or covered. The unit
should not be placed in a built-in installation unless
proper ventilation is provided or the manufacturer's
instructions have been adhered to.

10 Power sources - Units should be operated only from the

type of power source indicated on the marking label. If
you are not sure of the type of power supply you plan to
use, consult your appliance dealer or local power
company. For units intended to operate from battery
power, or other sources, refer to the "Installation and
User Instructions".

11 Grounding or polarisation - This unit may be equipped

with a polarised alternating current line plug (a plug
having one blade wider than the other). This plug will fit
into the power outlet only one way. This is a safety
feature. If you are unable to insert the plug fully into the
outlet, try reversing the plug. If the plug still fails to fit,
contact your electrician to replace your obsolete outlet.
Do not defeat the safety purpose of the polarised plug.
Alternatively, this unit may be equipped with a 3-wire
grounding type plug having a third (grounding) pin.
This plug will only fit into a grounding-type power
outlet. This is a safety feature. If you are unable to insert
the plug into the outlet, contact your electrician to
replace your obsolete outlet. Do not defeat the safety
purpose of the grounding-type lug.

12 Power-Cord Protection - Power supply cords should be

routed so that they are not likely to be walked on or
pinched by items placed upon or against them, paying
particular attention to cords and plugs, convenience
receptacles, and the point where they exit from the
appliance.

13 Overloading - Do not overload outlets and extension

cords as this can result in a risk of fire or electrical shock.

14 Object and Liquid Entry - Never push objects of any

kind into this unit through openings as they may touch
dangerous voltage points or short-out parts that could
result in a fire or electric shock. Never spill liquid of any
kind on the unit.

15 Servicing - Do not attempt to service this unit yourself as

opening or removing covers may expose to dangerous
voltage or other hazards. Refer all servicing to qualified
service personnel.

16 Damage Requiring Service - Unplug the unit from the

outlet and refer servicing to qualified service personnel
under the following conditions:

• When the power-supply cord or plug is damaged.

• If liquid has been spilled, or objects have fallen into
the unit.

• If the unit has been exposed to rain or water.

• If the unit does not operate normally by following
the instructions for use. Adjust only those controls
that are covered by the instructions for use, as an
improper adjustment of other controls may result in
damage and will often require extensive work by a
qualified technician to restore the units to their
normal operation.

• If the unit has been dropped or the unit has been
damaged.

• When the unit exhibits a distinct change in
performance; this indicates a need for service.

17 Replacement Parts - When replacement parts are

required be sure the service technician has used
replacement parts specified by the manufacturer or parts
which have the same characteristics as the original part.
Unauthorised substitutions may result in fire, electric
shock or other hazards.

18 Safety Check - Upon completion of any service or

repairs to the units, ask the service technician to perform
safety checks to determine that the unit is in proper
operating condition.

19 Lightning - For added protection of the units during a

lightning storm, or when it is left unattended and unused
for long periods of time, unplug it from the wall outlet
and disconnect the cable system. This will prevent
damage to the unit due to lightning and power-line
surges.

Bosch Security Systems | 2003-09 | 3922 988 99482en

Plena Universal Pre-amplifier | Installation and Operating Manual | About this manual en | 4

About this manual

This manual provides all the information required to install and operate the unit.

Conventions

Warning

Follow these instructions to prevent personal injury.

Caution

Follow these instructions to prevent damage to the equipment.

Note

Read these instructions for tips and other useful information.

Safety precautions

Warning

Do not open the unit when it is connected to the mains. The unit contains non-insulated parts, which can
cause electric shock.

Caution

There are no user-serviceable parts inside the unit. Service must be done by qualified personnel.

Bosch Security Systems | 2003-09 | 3922 988 99482en

Plena Universal Pre-amplifier | Installation and Operating Manual | Table of contents en | 5

Table of contents

Important safeguards..........................................................................................................................................................3

About this manual ..............................................................................................................................................................4

Safety precautions...............................................................................................................................................................4

Table of contents ................................................................................................................................................................5

1 About the equipment ........................................................................................................................................................7

1.1 Controls and connections (front) .............................................................................................................................8

1.2 Controls and connections (rear) ..............................................................................................................................8

2 Internal settings ..................................................................................................................................................................9

2.1 Priority mode setting ................................................................................................................................................9

2.2 Channel settings ........................................................................................................................................................9

2.2.1 Microphone or Line input ..................................................................................................................................9

2.2.2 Mic/Aux input selection .....................................................................................................................................9

2.2.3 Speech filter on/off ..............................................................................................................................................9

2.3 Setting emergency, insertion or cascade ..............................................................................................................10

3 Installation in rack ...........................................................................................................................................................11

4 External settings and connections .................................................................................................................................12

4.1 Connect the DC supply (battery) ..........................................................................................................................12

4.2 Connect a microphone or line-level source .........................................................................................................13

4.3 Insertion or Cascade connection ...........................................................................................................................14

4.4 Connect a Booster amplifier or System pre-amplifier ........................................................................................14

4.5 Connect an emergency input line .........................................................................................................................15

5 Operation .........................................................................................................................................................................16

5.1 Set Line input volume, treble and bass ................................................................................................................16

5.2 Line monitoring ......................................................................................................................................................16

6 Technical data ..................................................................................................................................................................17

6.1 Electrical ..................................................................................................................................................................17

6.2 Performance ............................................................................................................................................................17

6.3 Inputs ........................................................................................................................................................................17

6.4 Outputs .....................................................................................................................................................................18

6.5 Interconnection .......................................................................................................................................................18

6.6 Relays .......................................................................................................................................................................18

6.7 Environmental conditions ......................................................................................................................................18

6.8 General .....................................................................................................................................................................18

Bosch Security Systems | 2003-09 | 3922 988 99482en

Plena Universal Pre-amplifier | Installation and Operating Manual | Table of Contents en | 6

Bosch Security Systems | 2003-09 | 3922 988 99482en