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

1 About the equipment

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1

DC Out

1

02

24VDC

F

Figure 1.1

The Plena Universal Amplifier is a mono mixer amplifier with 4 input channels. Each channel has 3 possible input connections and a direct XLR output. You can adjust volume and tone level for each channel. The 4 input channels and the cascade input are mixed to one master signal. This master signal is available on the XLR and DIN output (mic. level). Additional outputs are the tape out and cascade out. All pre-amplifier channels and the master output can be monitored with a headphone.

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Plena Universal Pre-amplifier | Installation and Operating Manual | en | 8

About the equipment

1.1 Controls and connections (front)

5

5 5 5 6 7 8

Plena Universal Pre-amplifier

0dB

1

-6 dB

-20 dB

2

Power

1/Line 2/Line 3/Line 4/Line

3

4

4 4 4

Figure 1.2

1 VU meter (LED bar) 2 Power on indication LED (green) 3 Power on/off 4 Tone control, channel 1 to 4

1.2 Controls and connections (rear)

Master

0

5 Volume, channel 1 to 4 6 Master volume 7 Channel selection for headphone 8 Headphone connection

Select

1

3

2

4

Master

1-

3

45

9

Dir.Out1 Dir.Out2 Dir.Out3 Dir.Out4 Ins/ Casc / Emgln Ins/ Casc Out Master Line Out Master Mic. Out

3 1

5

4

2

1/Line 2/Line

2

9 9 9 10 11 12 13 14 15

1-

3

45

GND

+

1

2

-

3

+

2

1

-

3

GND

3 1 2 3 3 1 2 3 45 76 8211

Figure 1.3

1 DIN (priority) input, channel 1 to 4 2 XLR input, channel 1 to 4 3 Cinch input, channel 1 to 4 4 Tape output (Cinch) 5 Earth connection screw 6 Emergency relay output (terminal 7 24 V DC backup power input (terminal 8 24 V DC output (terminal) 9 XLR for direct output, channel 1 to 4

14

Ins/Casc

3

5

LBB 1920/00 8900 19200005 115/230V~,50/60Hz No.

1-

3

Warnin g

45

This apparatusmust be earthed

4/Line

3/Line

1-

3

45

10 Insertion/ cascade switch 11 Insertion/ cascade / emergency input 12 Insertion/ cascade output 13 Master Line output (XLR) 14 Master Mic output (DIN, priority) 15 Mains voltage 115/ 230 V switch 16 Mains socket 17 Mains fuse

Rated input power: 25VA T0,5AL250V

L

R

Apparatus delivired connected for 230V-

EMG Out

115V 230V

16

17

DC In DC Out

+24V- +24V-

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Plena Universal Pre-amplifier | Installation and Operating Manual | en | 9

Internal settings

2 Internal settings

CN106

CN108

CN107

CINCH XLR

LINE 4

CINCH XLR

DIN

S104

MIC

LINE

CH4

SPEECH CH4

OFF

ON

JP108

AUX

MIC

INPUT

CH4

JP110

OVERRIDERELAY

OFF ACTIVE

20-1

LINE3

MIC

LINE

SPEECH CH3

OFF

AUX

INPUT

4E32E1 4E31B2

DIN CINCH XLR

S103

CH3

JP105

ON

JP106

MIC

CH3

LINE 2

DIN CINCH XLR

S102

MIC

LINE

CH2

SPEECHCH2

JP103

OFF

JP104

AUX

INPUT

ON

MIC CH2

E1234M

B

LINE 1

MIC

LINE

SPEECHCH1

JP101

OFF

JP102

AUX

INPUT

PRIORITY

JP109

SERIAL BLOCK

ON

OFF

JP114

CH-4

JP113

CH-4

JP112

CH-4

JP111

CH-4

MIXING

DIN

S101

CH1

ON

MIC

CH1

Figure 2.1

2.1 Priority mode setting

The priority mode can be set with jumper JP109 to serial or blocking mode. You can activate the mixing mode for channel 1 to 4 with jumpers JP111 to JP114. The jumper JP110 enables or disables the priority override contact for the 4 input channels. This contact is available on the Master Mic output to pass through priorities.

- Serial mode(default) : Channel 1 has the highest priority and channel 4 the lowest.

- Blocking mode : The first activated input channel has the highest priority and blocks all other channels.

- Mixing mode : The channel is mixed to the master output irrespective of priority.

2.2 Channel settings

2.2.1 Microphone or Line input

If you connect a microphone to an input channel, the switch (S101 to S104) must be in the Mic position. This setting activates the Phantom power supply. If you connect a line level source the switch (S101 to S104) must be set in the line position.

2.2.2Mic/Aux input selection

If you use the 5-pole DIN or the 3-pole XLR input of a channel, the corresponding jumper (JP102, JP104, JP106 or JP108) must be in the MIC position. If you use the Cinch input the jumper must be in the AUX position.

2.2.3Speech filter on/off

Each channel has a speech filter that can be enabled or disabled with the corresponding jumper (JP101, JP103, JP105, and JP107). The speech filter improves speech intelligibility by cutting off the lower frequencies.

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Plena Universal Pre-amplifier | Installation and Operating Manual | en | 10

Internal settings

2.3 Setting emergency, insertion or cascade

The functionality of the insertion/cascade/emergency input is determined with jumper JP301 and the 'Ins/Casc' switch at the back of the unit.

Input/output used for Jumper JP301 Switch

Insertion OFF INS

Cascade OFF CASC

Emergency ON CASC

Note

If you use the emergency option, the emergency volume can be set with VR301. This volume is not affected by the master volume.

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Plena Universal Pre-amplifier | Installation and Operating Manual | en | 11

Installation in rack

3 Installation in rack

Pl

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4

3

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r

Figure 3.1

-

2

The universal pre-amplifier is delivered for table-top use, but you can mount it in a 19" rack. If you mount the pre-amplifier in a rack, you must:

• use the mounting brackets delivered with the unit.

• remove the 4 feet from the bottom of the unit. (Without the feet the unit is 2U high).

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Plena Universal Pre-amplifier | Installation and Operating Manual | en | 12

Rated i

n

put

P

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r:100VA

T0.5AL 25

0V

st be

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d

+24V-

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24

V-

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DC OUT

pparatus de

l

ivi

red

con

nected f

or 230V-

L

R

External settings and connections

4 External settings and connections

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2 4

V-

Figure 4.1

+

12 VD C

14

-

F

+

-

12 VDC

4.1 Connect the DC supply (battery)

The universal pre-amplifier has a 24 Vdc input (terminal screw), which you can use to connect a back up power supply, e.g. batteries. You can earth the unit to increase the electrical stability of the system. The unit is protected against reversal of the battery polarity.

Caution

The connection cable must have an in-line fuse. Use the type of fuse as mentioned in the illustration.

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Plena Universal Pre-amplifier | Installation and Operating Manual | en | 13

3

5

4

1

2

1

+

-

G

N

D

3

1

2

+

-

G

ND

3

1

-

4

3 5

1

-

4

3 5

1

-

4

3 5

Di

r.Ou

t1

D

i

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ir.Ou

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D

ir.Ou

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In

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External settings and connections

4.2 Connect a microphone or line-level source

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D

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Figure 4.2

1

3

4

5

1

/

L

i

ne

2

/

L

i

ne

GND

Cinch 180 5-pole DI N 180 3-pole XLR

All channels have 3 possible inputs, use one of these inputs to connect a microphone or a line-level source. The XLR and DIN input are balanced, the stereo Cinch input is unbalanced and converted to mono. If you use an input make sure that the internal switch settings are correct (refer to §2.2).

Note

If you want to use the priority feature, you must use a microphone or line-level source with a priority contact on pin 4 and 5 of the 5-pole DIN plug.

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Plena Universal Pre-amplifier | Installation and Operating Manual | en | 14

External settings and connections

4.3 Insertion or Cascade connection

D

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Figure 4.3 Figure 4.4

ut1

D

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D

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-

If you use the insertion or cascade mode, you must set the 'Ins/Casc' switch, on the rear, in the correct position. The insertion mode can be used to connect an external sound-processing device, e.g. an equaliser. To increase the number of input channels, you must use the cascade mode to link pre-amplifiers. E.g. with 2 pre-amplifiers, the second preamplifier has 8 channels on its master output (4 channels from the first pre-amplifier and 4 channels of its own).

4.4 Connect a Booster amplifier or System pre-amplifier

Dir

. O

u

t1

D

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D

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ne

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4

V

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-

Z 1

Z2

Z3

Z4

Z5

Z6

Figure 4.5

The master output and/or the direct outputs can be connected to a Plena Booster to amplify the signal to loudspeaker level. You can also use the outputs to connect the universal pre-amplifier to the System pre-amplifier or other equipment. The Master Mic output (DIN) has a priority relay contact on pin 4 and 5. This relay is activated when a priority contact of one of the inputs is closed.

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

Plena Universal Pre-amplifier | Installation and Operating Manual | en | 15

1

2

+

-

G

ND

3

1

-

4

3 5

Dir.Out4

Ins/Casc/Emgl

n

I

n

s/Casc

In

s/CascO

ut

M

14

3 5

External settings and connections

4.5 Connect an emergency input line

Dir

.

O

u t 1

Di

r . O

u

t 2

D ir

. O

u

t 3

D

i r .

O

u t4

3

1

5

4

2

1

/ L

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I n

s /C as

c

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m g

l n

Ins

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as

c O

u

1

+

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N

3

D

2

4

-

1

5

3

t

I

Ma

n

s / C

s t

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e

s

r

c

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u

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+

1

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2 /

L i

n e

t

M as

t e rM

i

c .

O

u

1

3

4

5

t

L B

B

1 9

2 0

8

/ 0

9

0 0 0

1

9 2

1

0

1

0 5

5

0 /

V

0

2

-

5

3

0

2

V

3

N

~

0

,

o

5

V

.

0

-

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0

H z

1

3

A

4

3

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e

p

1

p

a

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t u

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s

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d

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4

n

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r

c

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5

d

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f o

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2

i n

3

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a

t

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r

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s

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m

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u

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s

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t

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b

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5

e

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a

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r

t h

2

e

5

d

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0

L

E

M

G

Out

4 / L

i

D

n

C

e

R

I n

D

CO

u

t

+

2 4

V

- +

2 4

V

-

Figure 4.6

3

/Line

1

3

4

5

You can use this input for emergency announcements and/or signals. This line is activated when the signal is above a certain threshold (VOX). When the line is activated it has the highest priority and overrules all input channels. The emergency line has its own internal volume control and is not affected by the master volume. To set the emergency volume, refer to §2.3. If you use the emergency input make sure that the internal settings are correct (refer to §2.2).

Note

The emergency input has a 24 V relay output (screw terminal), which is activated on the VOX of the input. An additional 24 Vdc output (screw terminal) is available to power external relays.

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

Plena Universal Pre-amplifier | Installation and Operating Manual | en | 16

Operation

5Operation

P

l

e

n

a Univ

e

rs

0dB

al

Pre

-

ampli

fie

1

d

B

P

o

w

e

r

/

L

i

n

e

2/Line

3

/

L

in

e

4/

L

ine

M

as

t

e

r

S

e

lect

3

2

4

1

Mast

e

r

Figure 5.1

-6

-20 dB

5.1 Set Line input volume, treble and bass

You can adjust the volume, treble and bass for each channel by turning the corresponding knobs. To change the overall volume you must turn the 'Master' volume knob.

5.2 Line monitoring

The line monitoring can be used to listen to a single channel or the master channel. To do so connect a headphone at the front of the pre-amplifier. Use the 'Select' switch to select a channel.

Note

The VU-meter always shows the volume for the selected channel.

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

Plena Universal Pre-amplifier | Installation and Operating Manual | en | 17

Tec hn ic al da ta

6 Technical data

6.1 Electrical

Mains voltage 230/115 Vac, ±15 %, 50/60 Hz Max mains power consumption 25 VA Battery voltage 24 Vdc, +20 %/-10 % Max battery current 1A

6.2 Performance

Frequency response 50 Hz - 20 kHz (+1/-3 dB) Distortion <0.5 % Bass control ±10 dB at 100 Hz Treble control ±10 dB at 10 kHz Line separation at 1 kHz >70 dB Priority mute >40 dB

6.3 Inputs

Mic/Line inputs 1-4 (3-pin XLR/5-pin DIN, balanced)

Sensitivity 1 mV (microphone), 200 mV (line) Impedance >1 kOhm (microphone), >5 kOhm (line) S/N (flat at max volume) >63 dB (microphone), >70 dB (line) S/N (flat at min volume/muted) >75 dB CMRR >40 dB (50 Hz - 20 kHz) Headroom >25 dB Speech filter -3 dB at 315 Hz, high-pass, 6 dB/oct Phantom power supply 16 V via 1.2 kOhm, in microphone mode only

Line inputs 1-4 (Cinch, unbalanced, stereo converted to mono)

Sensitivity 200 mV Impedance 22 kOhm S/N (flat at max volume) >70 dB S/N (flat at min volume/muted) >75 dB Headroom >25 dB

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

Plena Universal Pre-amplifier | Installation and Operating Manual | en | 18

Tec hn ic al da ta

6.4 Outputs

Direct outputs 1-4 (3-pin XLR, balanced)

Nominal level 1 V Impedance <100 Ohm

Master output (3-pin XLR, balanced)

Nominal level 1 V Impedance <100 Ohm

Master output (5-pin DIN, balanced)

Nominal level 4 mV (microphone level) Impedance <100 Ohm

Tape output (Cinch, 2x mono)

Nominal level 350 mV Impedance <1 kOhm

Headphone output (6.3 mm jack stereo, signal mono)

Nominal level 3 V Impedance <100 Ohm

6.5 Interconnection

Interconnection/emergency input (3-pin XLR, balanced)

Sensitivity 200 mV (interconnection)

100 mV - 1 V adjustable (emergency) Impedance >10 kOhm VOX threshold 45 mV (emergency)

Interconnection output (3-pin XLR, balanced)

Nominal level 200 mV Impedance <100 Ohm

6.6 Relays

Priority relay contacts 30 V, 1 A Emergency relay contacts 30 V, 1 A DC supply output voltage 24 V, 250 mA max

6.7 Environmental conditions

Operating temperature range -10 to +55 °C Storage temperature range -40 to +70 °C Relative humidity <95 %

6.8 General

EMC emission acc. to EN 55103-1 EMC immunity acc. to EN 55103-2 Dimensions 100 x 430 x 270 mm (19" wide, 2U high) Weight approx. 5 kg

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

For more information visit

www.boschsecuritysystems.com

Data subject to change without notice

2003-09 | 3922 988 99482en

Bosch LBB 1920 User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual

Important safeguards

About this manual

Safety precautions

Table of contents

1 About the equipment

1.1 Controls and connections (front)

1.2 Controls and connections (rear)

2 Internal settings

2.1 Priority mode setting

2.2 Channel settings

2.2.1 Microphone or Line input

2.2.2Mic/Aux input selection

2.2.3Speech filter on/off

2.3 Setting emergency, insertion or cascade

3 Installation in rack

4 External settings and connections

4.1 Connect the DC supply (battery)

4.2 Connect a microphone or line-level source

4.3 Insertion or Cascade connection

4.4 Connect a Booster amplifier or System pre-amplifier

4.5 Connect an emergency input line

5Operation

5.1 Set Line input volume, treble and bass

5.2 Line monitoring

6 Technical data

6.1 Electrical

6.2 Performance

6.3 Inputs

6.4 Outputs

6.5 Interconnection

6.6 Relays

6.7 Environmental conditions

6.8 General