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Bosch LBB 1920 Installation And Operating Manual

Plena universal pre-amplifier.
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Plena Universal Pre-amplifier
Installation and Operating Manual
en
LBB 1920

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   Summary of Contents for Bosch LBB 1920

  • Page 1

    Plena Universal Pre-amplifier Installation and Operating Manual LBB 1920...

  • Page 3: 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 99482en...

  • Page 4: 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 99482en...

  • Page 5: Table Of Contents

    Set Line input volume, treble and bass ........................16 Line monitoring ..............................16 6 Technical data ..................................17 Electrical ..................................17 Performance ................................17 Inputs ..................................17 Outputs ..................................18 Interconnection ...............................18 Relays ..................................18 Environmental conditions ............................18 General ..................................18 Bosch Security Systems | 2003-09 | 3922 988 99482en...

  • Page 6

    Plena Universal Pre-amplifier | Installation and Operating Manual | Table of Contents en | 6 Bosch Security Systems | 2003-09 | 3922 988 99482en...

  • Page 7: About The Equipment

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

  • Page 8: Controls And Connections (front)

    15 Mains voltage 115/ 230 V switch 7 24 V DC backup power input (terminal 16 Mains socket 8 24 V DC output (terminal) 17 Mains fuse 9 XLR for direct output, channel 1 to 4 Bosch Security Systems | 2003-09 | 3922 988 99482en...

  • Page 9: Internal Settings

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

  • Page 10: Setting Emergency, Insertion Or Cascade

    Jumper JP301 Switch Insertion Cascade CASC Emergency 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. Bosch Security Systems | 2003-09 | 3922 988 99482en...

  • Page 11: Installation In Rack

    • 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). Bosch Security Systems | 2003-09 | 3922 988 99482en...

  • Page 12: External Settings And Connections

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

  • Page 13: Connect A Microphone Or Line-level Source

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

  • Page 14: Insertion Or Cascade Connection

    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...

  • Page 15: Connect An Emergency Input Line

    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...

  • Page 16: Operation

    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...

  • Page 17: Technical Data

    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...

  • Page 18: Outputs

    <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...

  • Page 20

    For more information visit www.boschsecuritysystems.com © Bosch Security Systems B.V. Data subject to change without notice 2003-09 | 3922 988 99482en...

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