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Bosch LBB 1903/10 Installation And Operating Manual

Plena mixer amplifier installation and operating manual.
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Communications Systems | LBB 190x/10 and LBB 191x/10 Plena Mixer Amplifiers
LBB 190x/10 and LBB 191x/10 Plena
Mixer Amplifiers
The Plena mixer amplifier is a versatile, high-performance
unit with four mono microphone inputs and a music input.
It fulfills a wide variety of public address requirements at
a surprisingly low cost.
Functions
All input channels have a phantom power supply to
provide power to condenser microphones and selectable
speech filters for improved intelligibility. Input channels 3
and 4 can also be switched to line sensitivity. Separate
music inputs are available with their own input selector
and volume control.
Input channel 1 can take priority over all other
microphone and music inputs. Contact closure on the 5-
pin DIN connector, or if the signal level on channel 1
exceeds a predefined value (VOX) will activate priority. A
2-tone chime can be configured to precede a priority
announcement. A telephone or emergency input with VOX
activation and its own preset volume control overrides all
other input.
▶ 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
▶ VOX activated emergency override
▶ Outputs for normal, call-only and mix-only zones
▶ Choice of CD, tuner or auxiliary music inputs
Loop through input and output connections enable
external sound processing equipment, such as an
equalizer or the Plena feedback suppressor, to be
connected between the preamplifier and the power
amplifier stages. An LED VU-meter monitors the master
output. The unit also has a tape output channel.
The Plena mixer amplifiers come in a range of maximum
output power. This power is directly available on 70 V and
100 V constant voltage connections and on a low
impedance connection for an 8 ohm load. Moreover, the
amplifiers have a separate 70 V / 100 V call-only output
channel for addressing areas where only priority
announcements are required, and a 70 V / 100 V mix-only
output channel for areas where no priority
announcements should be heard. The call-only output can
also be used for 3-wire remote, volume control override.
For more output power than the built-in power stage can
deliver, additional Plena power amplifiers can be
connected to the balanced line output in a loop-through
arrangement.
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 when certain announcements or background music
should not be heard in part of a building. Priority calls,
however, are always routed to both zones.
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   Summary of Contents for Bosch LBB 1903/10

  • Page 1

    Communications Systems | LBB 190x/10 and LBB 191x/10 Plena Mixer Amplifiers LBB 190x/10 and LBB 191x/10 Plena Mixer Amplifiers ▶ Range of single and dual zone mixer amplifiers from 30 W to 120 W ▶ Four low-noise balanced inputs for microphone or line ▶...

  • Page 2

    Voltage 230/115 VAC, ±10%, 50/60 Hz • Headphone jack Inrush current Back LBB 1903/10 4.5 / 9 A (230 / 115 VAC) • Priority mic input (DIN/6.3 mm jack) • LBB 1906/10 5 A / 10 A (230 / 115 VAC) Mic input (XLR/6.3 mm jack)

  • Page 3

    Screw, floating Impedance >1 kohm (mic); >5 kohm (line) Power S/N (flat at max volume) >63 dB (mic); >70 dB (line) LBB 1903/10 16 V (30 W) S/N (flat at min volume/muted) >75 dB LBB 1906/10 22 V (60 W) CMRR >40 dB (50 Hz to 20 kHz)

  • Page 4: Ordering Information

    Phone: +65 6571 2600 Fax: +1-800-955-6831 Fax: +31 40 2577 330 Fax: +65 6571 2698 audiosupport@us.bosch.com emea.securitysystems@bosch.com apr.securitysystems@bosch.com www.boschsecurity.com www.boschsecurity.com www.boschsecurity.com © Bosch Security Systems Inc. 011 | Data subject to change without notice T865996555 | Cur: en-US, V22, 27 Jan 2011...

  • Page 5

    Plena Mixer Amplifier Installation and Operating Manual LBB 1903/10, LBB 1906/10, LBB 1912/10, LBB 1914/10...

  • Page 7: Important Safeguards

    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. Bosch Security Systems | 2003-09 | 3922 988 92883en...

  • Page 8: About This Manual

    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 92883en...

  • Page 9: Table Of Contents

    5 Operation of mixer amplifier ............................19 Source selection ...............................19 Volume and tone control ............................19 Zone selection (LBB1914/10 only) ........................19 6 Technical data ..................................20 Electrical ..................................20 Performance ................................20 Inputs ..................................20 Outputs ..................................21 Environmental conditions ............................21 General ..................................22 Bosch Security Systems | 2003-09 | 3922 988 92883en...

  • Page 10

    Plena Mixer Amplifier | Installation and Operating Manual | Table of Contents en | 6 Bosch Security Systems | 2003-09 | 3922 988 92883en...

  • Page 11: About The Mixer Amplifier

    The power amplifier has a direct output for mixed signals and priority announcements, but additionally a priority controlled output relay routes the output to loudspeaker zones that should receive only priority announcements or no priority announcements at all. Bosch Security Systems | 2003-09 | 3922 988 92883en...

  • Page 12: Controls And Connections (front)

    5 Input 3 (microphone) volume control 12 Zone 1 selection button (LBB1914/10 only) 6 Input 4 (microphone) volume control 13 Zone 2 selection button (LBB1914/10 only) 7 Line (music source) volume control Bosch Security Systems | 2003-09 | 3922 988 92883en...

  • Page 13: Controls And Connections (rear)

    9 CD input (2x phono connectors) LBB1914 T2.5A (230 Vac) / T5A (115 Vac) 10 Tape input (2x phono connectors) 19 Mains voltage 115/230 V switch 11 Auxiliary input (2x phono connectors) Bosch Security Systems | 2003-09 | 3922 988 92883en...

  • Page 14: Internal Settings

    The speech intelligibility can be improved by cutting off the lower frequencies of the signal. To activate this filter for each microphone input, set the respective filter jumper (JP401 for input 1, JP402 for input 2, JP403 for input 3 and JP405 for input 4) to ON. Bosch Security Systems | 2003-09 | 3922 988 92883en...

  • Page 15: Setting The Chime Volume

    Mix Only output just provides the mixed signals and switches off at priority calls. The zone selection buttons control the outputs of Zone 1 and 2, but priority announcements are always routed to these zones. Bosch Security Systems | 2003-09 | 3922 988 92883en...

  • Page 16: Installation In Rack

    (45 °C ambient). • use the mounting brackets which can be ordered by Bosch (LBC 1901/00). • remove the 4 feet from the bottom of the unit. Without the feet the unit is 2U high.

  • Page 17: External Settings And Connections

    M ic/ Lin 11 5V /2 30 Wa rn Th is ap pa rat us mu st be ea rth ed 6.3 mm phono jack 180 5-pole DIN 180 3-pole XLR Figure 4.2 Bosch Security Systems | 2003-09 | 3922 988 92883en...

  • Page 18: Chime On/off-switch

    VR401 on the main PCB of the unit (see §2.3). Note Only when connecting a 5-pole DIN microphone to the 5-pole DIN connector of microphone input 1 the chime can be activated. Bosch Security Systems | 2003-09 | 3922 988 92883en...

  • Page 19: Microphone Inputs

    Never try to make a direct connection between the telephone network and the mixer amplifier. Bosch Security Systems | 2003-09 | 3922 988 92883en...

  • Page 20: Music Source Inputs

    M ic /L 0 dB -6 dB -20 dB Po we Figure 4.7 The line output (12) is an output for connecting additional PA amplifiers (such as the Plena Booster Amplifiers). Bosch Security Systems | 2003-09 | 3922 988 92883en...

  • Page 21: Connecting Loudspeakers

    You can use the Call Only output for 3-wire remote volume control override. In this case, ensure that the selected voltage for the Call Only output is the same as for the direct output or the zone outputs. Bosch Security Systems | 2003-09 | 3922 988 92883en...

  • Page 22: Low Impedance Loudspeakers

    Use the supplied mains cord to connect the system to the mains supply. Note If necessary set the switch 115/230 V to the required voltage using a sharp object, e.g. a small screwdriver. Bosch Security Systems | 2003-09 | 3922 988 92883en...

  • Page 23: Operation Of Mixer Amplifier

    Use the zone selection buttons (12 and 13) to route the music/microphone mix from the amplifier output to loudspeaker zone 1 and/or loudspeaker zone 2. Priority announcements, however, are always routed to both zones, irrespective of the position of the zone selection buttons. Bosch Security Systems | 2003-09 | 3922 988 92883en...

  • Page 24: Technical Data

    > 40 dB (50 Hz - 20 kHz) Headroom > 25 dB Speech filter -3 dB @ 315 Hz, high-pass, 6 dB/oct Phantom power supply 16 V via 1.2 kOhm (microphone) Bosch Security Systems | 2003-09 | 3922 988 92883en...

  • Page 25: Outputs

    Output power @ 24 V battery operation -1 dB ref. rated power 6.5 Environmental conditions Operating temperature range -10 to +45 °C Storage temperature range -40 to +70 °C Relative humidity < 95% Bosch Security Systems | 2003-09 | 3922 988 92883en...

  • Page 26: General

    100 x 430 x 270 mm (19” wide, 2U high) Weight LBB1903/10 approx. 5 kg LBB1906/10 approx. 8.5 kg LBB1912/10, LBB1914/10 approx. 10.5 kg 19” mounting brackets LBC1901/00 (to be ordered separately) Bosch Security Systems | 2003-09 | 3922 988 92883en...

  • Page 28

    For more information visit www.boschsecuritysystems.com © Bosch Security Systems B.V. Data subject to change without notice 2003-09 | 3922 988 92883en...

This manual also for:

Lbb 1906/10, Lbb 1912/10, Lbb 1914/10

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