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Plena Booster Amplifier
en
Installation and Operating Manual
LBB 1930, LBB 1935,
LBB 1938
Plena Booster 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 92983en
Plena Booster Amplifier | Installation and Operating Manual | About this manual
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.
en | 4
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 92983en
Plena Booster Amplifier | Installation and Operating Manual | Table of contents en | 5
Table of contents
6.6
Bosch Security Systems | 2003-09 | 3922 988 92983en
Plena Booster Amplifier | Installation and Operating Manual | Table of Contents en | 6
Bosch Security Systems | 2003-09 | 3922 988 92983en
Plena Booster Amplifier | Installation and Operating Manual | About the equipment
1 About the equipment
LBB1930
LBB1935 Temp.
Sensor
VU
Input
100V
70V
8Ohm
0
0
Loopthrough
100V
Slave Input 100V
0
Fuse
Power
230V
240V
DC Fuse
Power
DC In 24V
+
-
Figure 1.1
Input 1 Priority
Loopthrough 1
Input 2 Program
Loopthrough 2
LBB1938
Overheat
Temp.
Sensor
VU
100V
F701
70V
F702
0
0
100V
70V
8Ohm
0
0
Priority Only
No Priority
Input 1 Priority
2..24V - Input 1
0V - Input 2
Input 2 Enable
2..24V - Enable
0V - Mute
+
-
+
-
Slave Input 100V
100V
0
+
DC In 24V
-
Figure 1.2
Bosch Security Systems | 2003-09 | 3922 988 92983en
Delay
Power
230V
Power
DC Fuse 40A
Battery en | 7
Plena Booster Amplifier | Installation and Operating Manual | About the equipment en | 8
The Plena Booster Amplifier range consists of three mono amplifiers with output powers of 120 W (LBB1930), 240
W (LBB1935) or 480 W (LBB1938). These booster amplifiers have 70 V and 100 V constant voltage outputs and a low impedance output for 8 Ohm loudspeakers. The amplifiers are protected against overload and short circuits.
Built-in features like a temperature controlled fan and an overheat protection ensure high reliability. Battery operation with automatic switchover from the mains supply is possible. The line inputs are balanced and have a loopthrough facility; a 100 V slave input allows for connection to existing loudspeaker lines. The LBB1938 has double inputs with a priority function and priority controlled outputs.
1.1 Controls and indicators (front)
2
Plena Booster Amplifier
0 dB
1 VU meter (LED bar)
-20 dB
2 Power on indication LED (green)
4 Tone control, channel 1 to 4
Figure 1.3
1
2
Plena Booster Amplifier
0 dB
-6 dB
-20 dB
Power
5 Volume, channel 1 to 4
6 Master volume
7 Channel selection for headphone
8 Headphone connection
LBB1930
LBB1935
LBB1938
Battery Overheat
Figure 1.4
1
1 Power button
2 VU-meter (LED's for -20, -6, 0 dB and Power ON)
3 Battery operation indicator (only for LBB1938)
4 Overheat indicator (only for LBB1938)
5 Air inlet for forced air cooling (only for LBB1938)
3 4 5
Bosch Security Systems | 2003-09 | 3922 988 92983en
Plena Booster Amplifier | Installation and Operating Manual | About the equipment en | 9
1.2 Controls and connections (LBB1930, LBB1935 - rear)
LBB1930
LBB1935
230V- 240V-
100V 0V
100V
+
1
-
3
GND
2
GND
1
-
3
+
2 line in line out
100V 70V 0 0 8
24V DC IN
+
Line fuse
250V T1A
Apparatus delivered connected for 230V-
Warning
This apparatus must be earthed
1 2 3
Figure 1.5
1 Level control
2 100 V / 0 V slave input terminal
3 Line input (XLR/balanced)
4 Line input (phone jack/balanced)
5 Line loopthrough (XLR/balanced)
6 Line loopthrough (phone jack/balanced)
7 Loudspeaker output terminals and 24 Vdc power supply terminals
4 5 6 7
8 Earth connection screw
9 Mains fuse
LBB1930 T2.5A
LBB1935 T4A
10 Mains connector (3-pole)
11 Mains voltage switch 230/240 V
11
10
9
8
1.3 Controls and connections (LBB1938 - rear)
15 14 13 12
Input 1
Priority
Input 2
Enable
Slave Input
100V
Inpu t 1 Priority
Loopthrough 1
Input 2 Program
Loopthrough 2
Input 1 Priority
2..24V-Input 1
0V-Inpu t 2
Inpu t 2 Enable
2..24V-Enable
0V-Mute
+
-
+
-
Slave Input 100V 100V
0
2..24V
GND 2..24V
Default Off
GND
Default On
100V 0
Input 1-Pr iority Input 2-Program
Direct O utput
100V/70V
100V
0
70V
0
8ohm
Priority Only
0
No Priority
0
Priority
100V 0 70V 0 8
Priority ControlledO utput
Priority Only No Priority
100V 0 100V 0
Input Input
LBB1938
9
8
11
10
1 2 3 4 5 6
Figure 1.6
1 Priority line - input 1 (XLR/balanced)
2 Level control - input 1
3 Line loopthrough 1 (XLR/balanced)
4 Program line - input 2 (XLR/balanced)
5 Level control - input 2
6 Line loopthrough 2 (XLR/balanced)
7 Priority controlled loudspeaker output terminals
8 Earth connection screw
Bosch Security Systems | 2003-09 | 3922 988 92983en
7
9 24 Vdc power supply terminals
10 Mains fuse (T10A)
11 Mains connector (3-pole)
12 Loudspeaker direct output terminals
13 100 V slave input terminals
14 Input 2 enable control terminals
15 Input 1 priority control terminals
Plena Booster Amplifier | Installation and Operating Manual | Internal setting (LBB1938 only)
2 Internal setting (LBB1938 only)
en | 10
LBB1938
F701
F702
100V
70V
Figure 2.1
The output voltage of the priority controlled loudspeaker outputs can be set to 70 V or 100 V. To this end, a high power fuse inside the unit is used as a voltage selector.
Insert the high power fuse into fuse holder F701 for 100 V selection (default setting), or into fuse holder F702 for 70
V selection. This selection does not affect the output voltage of the loudspeaker direct outputs.
Caution
Never insert two fuses into F701 and F702 simultaneously.
Bosch Security Systems | 2003-09 | 3922 988 92983en
Plena Booster Amplifier | Installation and Operating Manual | Installation in rack
3 Installation in rack
LBB1930
LBB1935
1
Plena Boo
0 dB
-20 dB ster Amplifier
Power
1
Plena Boos ter Amplifier
0 dB
-20 dB
Power
1
Battery
Overhea
LBB1938 en | 11
1
Figure 3.1
The booster amplifier is delivered for tabletop use, but you can mount it in a 19" rack using the brackets supplied with the unit. In case of rack mounting, you must:
• remove the 4 feet from the bottom of the unit. Without the feet, the LBB1930 and LBB1935 are 2U high and the
LBB1938 is 3U high.
• leave 1U empty rack space above the LBB1930 or LBB1935 to ensure sufficient air flow.
• ensure that the ambient temperature of the unit in the rack does not exceed 55 °C.
In case of rack mounting, removal of the top cover of a booster amplifier is allowed to improve the ventilation. In such a case, always use the shimming washers that come with the brackets and make sure to comply with the safety instructions. The amplifier has a built-in temperature controlled fan for reliable operation at high output power for a prolonged time. If the internal temperature reaches a critical limit due to insufficient air flow, overload or an excessive ambient temperature, the overheat protection will be activated, causing the amplifier to switch to standby mode.
Bosch Security Systems | 2003-09 | 3922 988 92983en
Plena Booster Amplifier | Installation and Operating Manual | External settings and connections
4 External settings and connections
4.1 Connect the DC supply (battery)
en | 12
-
12 VDC
+
100V
70V
0
0
8
24V DC
-
IN
+
230V-
240V-
Line fus
Warning
This app aratus m e
A Appa ust be e arthed for 230
V-
F
-
12 VDC
+
8
100V
0V
100V
GND GND line out
100V 70V
230V-
240V-
24V DC
IN
Line fus
250V T1
A
Warning
This app aratus m
Apparatu s delivere
V-
LBB1930 (120W); F=F15A
LBB1935 (240W); F=F30A
Direct O utput
Rated in power : 1 put
600V
Apparatu connecte d for 230 d
V-
00V
0
70V
0
Priority
Priority
Controll only
8 ed Outp ut
No prio rity
00V 0
V
100V 0
Warning
This app aratus m ust be e arthed
24VDC
IN
-
12 VDC
+
-
12 VDC
+
Input 1-P riority
Input 1
Priority
Input 2
Enable
Slave In put
100V
Input 2-P rogram
Input
Loopthro ugh
Input
Loopthro ugh
8
Direct O utput
100V
70V
Priority
Controll ed Outp
No prio ut rity
100V 0
Rated in put power : 1 600V connecte d for 230
V-
T10L250
V
24VDC IN
100V 0
Warning aratus m ust be ea rthed
LBB1938 (480W); F=F40A
Figure 4.1
Figure 4.2
The booster amplifier has a 24 Vdc input (screw terminal), which you can use to connect a back up power supply, e.g. batteries. You can earth (8) the unit to increase the electrical stability of the system.
Caution
The connection cable must have an in-line fuse. Use the type of fuse as mentioned in the illustration.
Bosch Security Systems | 2003-09 | 3922 988 92983en
Plena Booster Amplifier | Installation and Operating Manual | External settings and connections
4.2 Connecting the line input and loopthrough
LBB1925/10
1-
4
/Line
3
5
Tel/EM
G Trigger
1 Trigger
2
0
1.Audio+
2.0V
4.24V
d.c.
/Line
5.Allca
7.Data+
LBB19
25/00
0V~,50/
60Hz
L
RS232
R
Maste rOut
CD
Out
+
GND
GND
Aux
+
100V
0
Zone 5
100V
0
Zone 1
100V
0
Zone 2
100V
0
Zone 3
Zone 6
Call Ac tive Call In
100V
0
100V
0
Zone 4 100V
DC Ou 0
DC In
100V
0
Appara connec
In tus deliv ered
115V-
+24V-
+24V-
Warnin
This ap paratus must b e earth ed
230V-
Rated input
Power
T1.0AL
: 50VA
250V
3 5
LBB1930
LBB1935
3 5
4
100V
0V
100V
GND
GND line ou
100V
70V 0
0
8
24V
DC IN
+
230V240V-
Line fuse
250V T1A
Warning paratus
Appar conn must b e earth ected ed atus del ivered for 230 V-
6
LBB1930
LBB1935
100V
0V
100V
GND
GND line out
4 6
100V
70V 0
0
8
24V
DC IN
+
230V240V-
Line
250V
Warning paratus must b fuse
T1A
Appa connec e earth ed ratus de
230V
LBB1938 LBB1938
4 6
Input 1-P riority
Input 1
Priority
Slave Inp ut
100V
Input 2-P rogram
Input
Loopthro ugh
Input
Loopthrou gh
Direct O utput
Rated power input
: 1600V
Appa connec elivere ted for d
230V-
100V
0
Priority
Priority
70V only
0
Controlle
8 d Outpu
No prio rity
100V 0
Line fu se
T10L25
0V
100V 0
Warning paratus must b e earthe d
24VDC
IN
4 6
Input 1-P riority
Input 1
Priority
Slave Inp ut
100V
Input 2-P rogram
Input
Loopthrou gh
Input
Loopthr ough
100V
0
70V
0
Priority
Priority
Controlle only
8 d Outpu
No prio rity
Rated power input
: 1600
V
Appa connec elivere ted for d
230V-
Line fu
T10L2 se
50V
24VDC
IN
100V 0
100V 0
Warning paratus must b e earth ed en | 13
Figure 4.3
The booster amplifier has a balanced line input for connection to a preamplifier or a mixer. Use the loopthrough connection to connect the booster amplifier to another booster amplifier if more power is needed. Each power amplifier must be connected to its own set of loudspeakers. Do not connect booster outputs to each other. The
LBB1930 and LBB1935 have both XLR (3 and 5) and phone jack connectors (4 and 6) for input and loopthrough.
For the LBB1938 use program line - input 2 (4) and line loopthrough 2 (6) for normal operation without priority.
Volume control
Use the volume control next to the line input to set the output level of the booster amplifier.
Bosch Security Systems | 2003-09 | 3922 988 92983en
Plena Booster Amplifier | Installation and Operating Manual | External settings and connections en | 14
4.3 Connecting the priority input and using the control terminals (LBB1938 only)
LBB1925/10
Apparatus delivered connected for 230V-
115V 230V
/Line
1-
4
3
5
3
5
2
4
1
Tel/EMG
Trigger 1 Trigger 2
LBB1925/10
890019251005
115/230V~,50/60Hz
No.
0
/Line
1. Audio+
2.0V
3.Audio-
4.24Vd.c.
5. Allcall
6.Data-
7.Data+
8.Chs.GND
PCAudoln
3
7
8
6
1
5
2
4
L
R
RS232
MasterOut
CD
Out
Aux
+
2 -
3
GND
1
GND
1 -
3
+
2
100V 0 100V 0 100V 0 100V 0
100V 0 100V 0 100V 0 100V 0 +24V+24V-
Warning
This apparatus must be earthed
Rated Input
Power : 50VA
T0.5L 250V
15 14
Input 1
Priority
Input 2
Enable
Slave Input
100V
Input 1 Prior ity
Loopthrough 1
Input 2 Program
Loopthrough 2
Input 1 Prior ity
2..24V-Input 1
0V-Input 2
Input 2 Enable
2..24V-Enable
0V-Mute
+
-
+
-
Slave Input 100V 100V
0
2...24V
GND 2...24V
GND
Default Off Default On
100V 0
Input 1-Priority Input 2-Program
Input Input
Zone 1 output
Direct Output
100V/70V
100V
0
70V
0
8ohm
Priority Only
0
No Pr iority
0
Priority
100V 0 70V 0 8
Priority Controlled Output
Priority Only N o Priority
100V 0 100V 0
LBB1938 15 14
Input 1
Priority
Input 2
Enable
Slave Input
100V
Input 1 Prior ity
Loopthrough 1
Input 2 Program
Loopthrough 2
Input 1 Prior ity
2..24V-Input 1
0V-Input 2
Input 2 Enable
2..24V-Enable
0V-Mute
+
+
-
-
Slave Input 100V 100V
0
2...24V
GND 2...24V
GND 100V
Default Off Default On
0
Input 1-Priority Input 2-Program
Input Input
Zone 2 output
Direct Output
100V/70V
100V
0
70V
0
8ohm
Priority Only
0
No Pr iority
0
Priority
100V 0 70V 0 8
Priority Controlled Output
Priority Only N o Priority
100V 0 100V 0
LBB1938
1 4 1 4 to next zones
Figure 4.4
Next to the program input (Input 2-Program) the booster amplifier LBB1938 is also provided with a balanced priority input (Input 1-Priority) for connection to another preamplifier or mixer.
Apply a control voltage of 2...24 V to the input 1 priority control terminals (15) to switch ON the priority input (1) and mute the program input (4). In this way a local music source can be connected to the program input and a remote emergency system to the priority input. The emergency source must be able to supply the 2…24 V control voltage to override the local music source. The program input can be remotely controlled by using a switch that is connected to the input 2 enable control terminals (14).
Application example for use of the LBB1938 control terminals (see fig. 4.4)
You can use up to six LBB1938 boosters in combination with the Plena LBB1925/10 System Pre-amplifier to build a powerful multi-zone sound system. Zone switching of background music and calls is done via the LBB1925/10 zone relays in combination with the LBB1938 control terminals. The LBB1925/10 controls the background music by distributing 24 Vdc via the music zone relays to the LBB1938 input 2 enable control terminals (14). The
LBB1925/10 controls the calls by distributing 24 Vdc via the call zone relays to the LBB1938 input 1 priority control terminals (15). Each booster serves one loudspeaker zone. Each zone can be OFF, or receive music or a call.
Bosch Security Systems | 2003-09 | 3922 988 92983en
Plena Booster Amplifier | Installation and Operating Manual | External settings and connections
4.4 100 V slave input
+
1
-
3
GND
2
GND
1
-
3
+
2
100V 0V
100V line in line out en | 15
LBB1930
LBB1935
230V- 240V-
100V 70V 0 0 8
24V DC IN
+
Line fuse
250V T1A
Apparatus delivered connected for 230V-
Warning
This apparatus must be earthed
Figure 4.5
15 14 13
Input 1
Pr iority
Input 2
Enable
Slave Input
100V
Input 1 Pr iority
Loopthrough 1
Input 2 Program
Loopthrough 2
Input 1 Pr iority
2..24V-Input 1
0V-Input 2
Input 2 Enable
2..24V-Enable
0V-Mute
+
+
-
-
SlaveInput 100V 100V
0
2..24V
GND 2..24V
Default Off
GND
Default On
100V 0
Input 1-Pr iority Input 2-Progr am
Input Input
Direct O utput
100V/70V
100V
0
70V
0
8ohm
Priority Only
0
No Priority
0
Priority
100V 0 70V 0 8
Priority Controlled O utput
Priority Only N o Priority
100V 0 100V 0
LBB1938
Figure 4.6
The booster amplifiers have a 100 V slave input that can be connected to an existing 100 V loudspeaker line. In this way it is easy to connect an additional booster amplifier on a remote location for more output power.
The 100 V input of the LBB1938 (13) is not affected by the control terminals for input 1 priority (15) or input 2 enable (14).
Bosch Security Systems | 2003-09 | 3922 988 92983en
Plena Booster Amplifier | Installation and Operating Manual | External settings and connections en | 16
4.5 Connecting loudspeakers
VU
LBB1930
LBB1935
100V
70V
8Ohm
0
0
100V 70V 0 0 8
24V DC IN
+
Figure 4.7
VU
LBB1938
100V
70V
8Ohm
100V
F701
70V
F702
0
0
0
0
Priority Only
No Priority
Figure 4.8
100 V
Figure 4.9
70 V
100 V 70 V
8 Ohm
8 Ohm
8 Ohm
8 Ohm
8 Ohm
4 Ohm
4 Ohm
8 Ohm
8 Ohm
4 Ohm
4 Ohm
8 Ohm
8 Ohm
8 Ohm
8 Ohm
8 Ohm
Input 2
Enable
Slave In put
100V
Input 1
-Priority
Input
Input 2
-Program
Loopth rough
Input
Loopth rough
Direct Output
100V 0 70V 0 8
Priority Controlled Output
Priority Only N o Priority
100V 0 100V 0
100V
0V
100V
GND
GND line out
100V 70V
0
0
8
24V DC
IN
+
230V-
240V-
Line fus e
T1A
Warning aratus m ust be connect earthed ed for 2 red
30V-
Direct O utput
100V
0
70V 0
8
Priority
Contro lled Ou rity tput
Rated input power : 1600
V
Apparat connec us deliv ered
230V-
Line fus e
0V
24VDC
IN
100V
0
100V
0
Warnin g paratus must be earthed
LBB1930
LBB1935
LBB1938
Priority Only No Priority
Figure 4.10
4.5.1 Constant voltage loudspeakers
The booster amplifier can drive 100 V constant voltage loudspeakers at full power (100 V) or half power (70 V).
Connect the loudspeakers in parallel and check the loudspeaker polarity for in-phase connection. The summed loudspeaker power should not exceed the rated amplifier power.
Bosch Security Systems | 2003-09 | 3922 988 92983en
Plena Booster Amplifier | Installation and Operating Manual | External settings and connections en | 17
LBB1938 only:
Ensure that the fuse for loudspeaker voltage selection is properly set (see chapter 2). The Priority Only and No
Priority outputs are controlled by a priority relay. The Priority Only output only provides priority announcements, while the No Priority output just provides the program signal and switches OFF at priority calls. You can also use the Priority Only output for 3-wire remote volume control override. In this case, ensure that the selected voltage for the Priority Only output is the same as for the direct output used.
4.5.2Low impedance loudspeakers
Connect low impedance loudspeakers to the 8 Ohm/0 terminals. This output can deliver the rated output power into an 8 Ohm load. Connect multiple loudspeakers in a series/parallel-arrangement to make the combined impedance 8 Ohm or higher. Check the loudspeaker polarity for in-phase connection.
4.6 Mains connection
11
230V-
240V70V
0
0
8
24V DC
IN
-
+
Line fus
250V T1
Warning
This appar atus mu st be
A App conne earthed aratus de cted fo livered r 230V-
0 2
Chime
1- -3
4 .5
1
R
CD
2
Aux
Line Ou t 1V
Mic/Lin
3
4
Inc
Mic/Lin
Out
In
100V
70V 0
0
8 24V DC
+
IN
230V240V-
Line fus
A
Warning aratus m ust be earthed
Apparatu ed for 2 red
30V-
LBB1930
LBB1935
Direct O utput
Rated power input
: 1600V connect ed for
V
0
70V
Priority
Priority
0
8
Controlle only d Outpu t
No prior ity
Line fuse
T10L25
0V
24VDC
IN
V 0
100V
0
Warning
This app aratus mu st be eart hed
Figure 4.11
Figure 4.12
Use the supplied mains cord to connect the system to the mains supply.
Input 1
Priority
Input 2
Enable
100V put
Input 1-P riority
Input
Input 2-P rogram
Loopthro ugh
Input
Loopthro ugh
Direct
Output
100V
0 70V
0
Priority only
8
Priority
Control
No prio rity ut
Rated power input
: 1600V
Apparat us deliver ed for 2 ed
30V-
Line fus
T10L25 0V
24VDC
IN
100V
0
100V
0
Warning paratus must be earthed
LBB1938
Note (LBB 1930 and LBB 1935 only)
If necessary set the mains voltage switch 230/240 V (11) to the required voltage using a sharp object, e.g. a small screwdriver.
Bosch Security Systems | 2003-09 | 3922 988 92983en
Plena Booster Amplifier | Installation and Operating Manual | Operation of booster amplifier
5 Operation of booster amplifier
2
Plena Booster Amplifier
0 dB
-6 dB
-20 dB
Power
LBB1930
LBB1935 en | 18
Figure 5.1
1
2
Plena Booster Amplifier
0 dB
-6 dB
-20 dB
Power
LBB1938
Battery Overheat
Figure 5.2
1 3 4 5
Upon switching ON the amplifier using the power button (1), the green Power On LED (2) lights up. The VU-bar shows the output level of the amplifier. If the internal temperature of the booster reaches a critical limit, due to poor ventilation or overload, an overheat protection circuit switches OFF the power stage.
LBB1938 only:
The overheat indicator (4) lights up if the power stage is switched OFF by the overheat protection circuit. The battery operation indicator (3) lights up if the mains power supply is failing and the back-up battery is in use.
Bosch Security Systems | 2003-09 | 3922 988 92983en
Plena Booster Amplifier | Installation and Operating Manual | Technical data
6 Technical data
6.1 Electrical
Mains voltage
LBB1930/00, LBB1935/00
LBB1930/50, LBB1935/50
LBB1938/00
Max mains power consumption
LBB1930/x0
LBB1935/x0
LBB1938/00
Max mains inrush current
LBB1930/00
LBB1930/50
LBB1935/00
LBB1935/50
LBB1938/00
Battery voltage
Max battery current
LBB1930/x0
LBB1935/x0
LBB1938/00
230/240 Vac, ±10%, 50/60 Hz
110 Vac, ±10%, 50/60 Hz
230 Vac, ±10%, 50/60 Hz
400 VA
800 VA
1600 VA
8 A
16 A
9 A
19 A
19 A
24 Vdc, +20%/-10%
6 A
11 A
30 A
6.2 Performance
Frequency response
Distortion
S/N (flat at max volume)
LBB1930/x0
LBB1935/x0
LBB1938/00
50 Hz - 20 kHz (+1/-3 dB @ -10 dB ref. rated output)
< 1% @ rated output, 1 kHz
> 80 dB
> 85 dB
> 90 dB
6.3 Inputs
Line input (3-pin XLR, 6.3 mm phone jack, balanced) - LBB1930/x0, LBB1935/x0
CMRR > 25 dB (50 Hz - 20 kHz)
Line input 1, 2 (3-pin XLR, balanced) - LBB1938/00
CMRR
100 V input (Screw, unbalanced)
> 25 dB (50 Hz - 20 kHz) en | 19
Bosch Security Systems | 2003-09 | 3922 988 92983en
Plena Booster Amplifier | Installation and Operating Manual | Technical data
6.4 Outputs
Line loopthrough output (3-pin XLR, 6.3 mm phone jack, balanced) - LBB1930/x0, LBB1935/x0
Nominal level
Impedance
1 V direct connection to line input
Line loopthrough output 1, 2 (3-pin XLR, balanced) - LBB1938/00
Nominal level
Impedance
1 V direct connection to line input
Loudspeaker outputs (Screw, floating)
Max/rated output power
70/100 V output
LBB1930/x0
LBB1935/x0
LBB1938/00
8 Ohm output
LBB1930/x0
LBB1935/x0
LBB1938/00
Output power @ 24 V battery operation
180 W/120 W
360 W/240 W
720 W/480 W
31 V (120 W)
44 V (240 W)
62 V (480 W)
-1 dB ref. rated power
6.5 Environmental conditions
Operating temperature range
Storage temperature range
Relative humidity
-10 to +55 °C
-40 to +70 °C
< 95%
6.6 General
EMC emission
EMC immunity
Acoustic noise level of fan
LBB1930/x0, LBB1935/x0
LBB1938/00
Dimensions
LBB1930/x0, LBB1935/x0
LBB1938/00
Weight
LBB1930/x0
LBB1935/x0
LBB1938/00
19” mounting brackets acc. to EN 55103-1 acc. to EN 55103-2
< 45 dB SPL @ 1 m
< 48 dB SPL @ 1 m
100 x 430 x 270 mm (19” wide, 2U high, with feet)
145 x 430 x 370 mm (19” wide, 3U high, with feet) approx. 10.5 kg approx. 12.5 kg approx. 25 kg included en | 20
Bosch Security Systems | 2003-09 | 3922 988 92983en
For more information visit www.boschsecuritysystems.com
© Bosch Security Systems B.V.
Data subject to change without notice
2003-09 | 3922 988 92983en
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Key Features
- 240 W power amplifier in a 2U high housing
- EN 54‑16 certified
- 70 V / 100 V and 8 ohm outputs
- Dual inputs with priority switching
- 100 V input for slave operation on 100 V speaker line
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