1. Manuals
  2. Brands
  3. Bosch Manuals
  4. Security System
  5. LBB 1968
  6. Installation and operating manual

Bosch LBB 1968 Installation And Operating Manual

Plena feedback suppressor
Hide thumbs Also See for LBB 1968:
Table of Contents

Advertisement

Quick Links

See also: User Manual
Plena Feedback Suppressor
Installation and Operating Manual
en
LBB 1968

Advertisement

Table of Contents
loading

Related Manuals for Bosch LBB 1968

Summary of Contents for Bosch LBB 1968

  • Page 1 Plena Feedback Suppressor Installation and Operating Manual LBB 1968...

  • 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 | 2003-11 | 9922 141 81681en...

  • 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 | 2003-11 | 9922 141 81681en...

  • Page 5: Table Of Contents

    Switching ON ................................20 Calibration ................................21 General recommendations to prevent feedback ....................21 5 Technical data ..................................22 Electrical ..................................22 Performance ................................22 Inputs ..................................22 Outputs ..................................23 Controls and indicators ............................23 Environmental conditions ............................23 General ..................................23 Bosch Security Systems | 2003-11 | 9922 141 81681en...
  • Page 6 Plena Feedback Suppressor | Installation and Operating Manual | Table of Contents en | 6 Bosch Security Systems | 2003-11 | 9922 141 81681en...

  • Page 7: About The Equipment

    'tracks' the moving speaker for optimum speech intelligibility, and the maximum feedback margin is maintained by keeping the summed gain constant. Even if the feedback processor is switched to bypass this automatic mixer is still operating. Bosch Security Systems | 2003-11 | 9922 141 81681en...

  • Page 8: Controls And Indicators (Front)

    The LED lights up to indicate a fast calibration cycle after pressing the calibrate button (9). 9 Calibrate button Upon pressing the calibrate button, random noise at -6 dBr is generated for a few seconds to allow the feedback suppression algorithm to calibrate quickly. Bosch Security Systems | 2003-11 | 9922 141 81681en...

  • Page 9: Controls And Connections (Rear)

    Switch that enables and disables phantom power on Microphone 1/Line input (1 and 2) and Microphone 2 input (4 and 5). When the line input is selected with the help of the Mic/Line switch (3), phantom power is disabled for this input. Bosch Security Systems | 2003-11 | 9922 141 81681en...

  • Page 10: Installation In Rack

    Remove the 4 feet from the bottom of the unit. Without the feet, the unit is 1U high. • Ensure that the ambient temperature of the unit in the rack does not exceed 55 °C. Bosch Security Systems | 2003-11 | 9922 141 81681en...

  • Page 11: External Settings And Connections

    24VDC In Mic/Line Mic/Line 100/70V/ 8Ω0 100/70 V 0 100/70 V 0 100/70 V 0 100/70 V 0 Chime Warning This apparatus must be earthed figure 3. 1 : Announcement set-up Bosch Security Systems | 2003-11 | 9922 141 81681en...

  • Page 12: Live Performance Set-Up And Conference Set-Up

    Rated input S/N. Design & Quality Power: 50VA The Netherlands Mic/Line T500L250V Signal Level Phantom Mic 1+2 Warning 1 2 3 4 This apparatus must be earthed figure 3.2: Live performance set-up Bosch Security Systems | 2003-11 | 9922 141 81681en...
  • Page 13 UTILISER UN FUSIBLE DE RECHANGE DE MEME TYPE Multi Link Rec. Line Trunk Port 1 COMMERCIAL AUDIO EQUIPMENT LISTED 9R88 Port 2 2A 250V Made in Holland Symmetrical figure 3.3: Conference set-up Bosch Security Systems | 2003-11 | 9922 141 81681en...

  • Page 14: Presentation Set-Up And Set-Up In Churches, Mosques, Houses Of Worship, Etc

    Zone 2 Call Only Mix Only Call/Mix 24VDC In Mic/Line Mic/Line 100/70V/ 8Ω0 100/70 V 0 100/70 V 0 100/70 V 0 100/70 V 0 Chime Warning This apparatus must be earthed figure 3.4: Presentation set-up Bosch Security Systems | 2003-11 | 9922 141 81681en...
  • Page 15 100/70V/ 8Ω0 100/70 V 0 100/70 V 0 100/70 V 0 100/70 V 0 Chime Warning This apparatus must be earthed figure 3.5: Set-up in churches, mosques, houses of worship, etc. Bosch Security Systems | 2003-11 | 9922 141 81681en...

  • Page 16: Signal Level

    +12 dBV Output level -12 dBV 0 dBV +12 dBV table 3.2: Mic in High Input level -42 dBV -30 dBV -18 dBV Output level 0 dBV 0 dBV 0 dBV Bosch Security Systems | 2003-11 | 9922 141 81681en...

  • Page 17: Setting The Options Switches

    The 'Bass lift' option is provided to correct this phenomenon. Bosch Security Systems | 2003-11 | 9922 141 81681en...
  • Page 18 Fast filter mode set-up Presentation Speech mode Dual input voice Any position Fast filter mode set-up tracking Churches, houses Music mode Dual input voice Any position Accurate filter mode of worship set-up tracking Bosch Security Systems | 2003-11 | 9922 141 81681en...

  • Page 19: Mains Connection

    Use the supplied mains cord to connect the system to the mains supply. Note If necessary set the mains voltage selection switch (14) to the required voltage using a sharp object, e.g. a small screwdriver. Bosch Security Systems | 2003-11 | 9922 141 81681en...

  • Page 20: Operation Of The Feedback Suppressor

    Note Keep in mind that, contrary to traditional feedback reduction systems, the Plena Feedback Suppressor suppresses feedback before it occurs. Consequently, deactivating the suppression algorithm may lead to immediate feedback. Bosch Security Systems | 2003-11 | 9922 141 81681en...

  • Page 21: Calibration

    Improve poor and reverberating room acoustics, e.g. by covering highly reflective (tiled) walls and floors with curtains or carpets. • Never use loudspeakers above their rated power. Due to power compression of the loudspeakers, the feedback margin is reduced. Try to ensure enough headroom. Bosch Security Systems | 2003-11 | 9922 141 81681en...

  • Page 22: Technical Data

    Loopthrough of pin 4 and 5 of DIN (for microphones with priority switch) Line input 3, Line (Cinch, unbalanced) Max. input level 18 / 6 / -6 dBV (Hi / Med / Lo level) Impedance 20 kOhm Bosch Security Systems | 2003-11 | 9922 141 81681en...

  • Page 23: Outputs

    EN 55103-2 Dimensions 56 x 430 x 270 mm (with feet, without mounting brackets) 19”, 1U high (with mounting brackets, without feet) Weight approx. 3 kg 19” mounting brackets included Bosch Security Systems | 2003-11 | 9922 141 81681en...
  • Page 24 Plena Feedback Suppressor | Installation and Operating Manual | en | 24 Bosch Security Systems | 2003-11 | 9922 141 81681en...
  • Page 26 For more information visit www.boschsecuritysystems.com © Bosch Security Systems B.V. Data subject to change without notice 2003-11 | 9922 141 81681en...

Table of Contents