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Bosch LBB 1968 Installation And Operating Manual Download Page 1

Plena Feedback Suppressor

Installation and Operating Manual

LBB 1968

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Summary of Contents for LBB 1968

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

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Page 3: ...he 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 electric...

Page 4: ...ety precautions 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 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 ...

Page 5: ...ngs and connections 11 3 1 Connecting the inputs and the outputs 11 3 1 1 Announcement set up 11 3 1 2 Live performance set up and Conference set up 12 3 1 3 Presentation set up and set up in churches mosques houses of worship etc 14 3 1 4 Signal level 16 3 2 Setting the options switches 17 3 3 Mains connection 19 4 Operation of the feedback suppressor 20 4 1 Switching ON 20 4 2 Calibration 21 4 3...

Page 6: ...Plena Feedback Suppressor Installation and Operating Manual Table of Contents en 6 Bosch Security Systems 2003 11 9922 141 81681en ...

Page 7: ...back suppression function the Plena Feedback Suppressor also features a built in automatic mixer for the two microphone inputs In many situations two microphones are used to better capture the voice of a moving speaker like on a rostrum pulpit or a conference table but often this increases the risk of acoustic feedback The automatic mixer of the Plena Feedback Suppressor however automatically redu...

Page 8: ...ion see 1 1 is active 5 Bypass indicator The LED lights up to indicate that the feedback suppression function is deactivated 6 Feedback suppression active indicator The LED lights up to indicate that feedback suppression algorithm is active 7 Bypass switch 8 Calibrate indicator The LED lights up to indicate a fast calibration cycle after pressing the calibrate button 9 9 Calibrate button Upon pres...

Page 9: ... in Cinch unbalanced 16 Phantom power switch microphone 1 and 2 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 figure 1 3 Controls and connections rear N663 115V 230V This apparatus must be earthed Warning Rated input Powe...

Page 10: ...t 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 unit is 1U high Ensure that the ambient temperature of the unit in the rack does not exceed 55 C figure 2 1 Installation in rack Power Plena Feedback Suppressor Signal Overload Present Voice tracking Processor Bypass Active Calibrate Installa...

Page 11: ...icrophone 1 input 2 figure 3 1 Announcement set up LBB1950 LBB1950 Mic In Mic In Line Out This apparatus must be earthed Warning 115V 230V Apparatus delivered connected for 230V Rated input power 400VA LBB1968 LBB1914 10 8900 191 21005 Max output power 180W Rated output power 120W 115 240V 50 60Hz S N LBB1914 10 3 1 1 4 5 L R CD Aux Line Out 1V Mic Line Mic Line Inc Out In 0 0 Chime Tel Emer 2 1 G...

Page 12: ... one unbalanced line output 6 Set the Mic Line switch 3 to Line to use the balanced line input 1 In this case the phantom power switch 16 has no function figure 3 2 Live performance set up LBB1968 Line Out Line In N663 115V 230V This apparatus must be earthed Warning Rated input Power 50VA T500L250V LBB 1968 00 8900 196 80001 Plena Feedback Suppressor 115 230V 50 60Hz S N Design Quality The Nether...

Page 13: ...RECHANGE DE MEME TYPE CAUTION ATTENTION N663 115V 230V This apparatus must be earthed Warning Rated input Power 50VA T500L250V LBB 1968 00 8900 196 80001 Plena Feedback Suppressor 115 230V 50 60Hz S N Design Quality The Netherlands Switch 1 2 3 4 Music mode Dualinputvoicetracking Mic1In Mic2In Process with bass lift Accurate mode Speech mode Single input Mic2 Line In Process flat Fast mode On Off ...

Page 14: ...1914 10 8900 191 21005 Max output power 180W Rated output power 120W 115 240V 50 60Hz S N LBB1914 10 LBB1968 3 1 1 4 5 L R CD Aux Line Out 1V Mic Line Mic Line Inc Out In 0 0 Chime Tel Emer 2 1 GND 2 3 1 GND 2 3 2 3 4 24VDCIn Call Mix Zone 1 Zone 2 CallOnly Mix Only 100 70V 8Ω0 100 70V 0 100 70V 0 100 70 V 0 100 70 V 0 Mic In Mic In N663 115V 230V This apparatus must be earthed Warning Rated input...

Page 15: ... Tel Emer 2 1 GND 2 3 1 GND 2 3 2 3 4 24VDCIn Call Mix Zone 1 Zone 2 CallOnly Mix Only 100 70V 8Ω0 100 70V 0 100 70V 0 100 70 V 0 100 70 V 0 N663 115V 230V This apparatus must be earthed Warning Rated input Power 50VA T500L250V LBB 1968 00 8900 196 80001 Plena Feedback Suppressor 115 230V 50 60Hz S N Design Quality The Netherlands Switch 1 2 3 4 Music mode Dualinputvoicetracking Mic1In Mic2In Proc...

Page 16: ...l switch 9 to the appropriate position in order to optimize the signal to noise ratio and to prevent overload See the tables below table 3 1 Line in table 3 2 Mic in Low Med High Input level 12 dBV 0 dBV 12 dBV Output level 12 dBV 0 dBV 12 dBV Low Med High Input level 42 dBV 30 dBV 18 dBV Output level 0 dBV 0 dBV 0 dBV External settings and connections ...

Page 17: ...ck suppression using the de reverberation algorithm filters and reduces the room reverb this may cause the low frequency response of the room to be less pronounced especially in larger halls The Bass lift option is provided to correct this phenomenon figure 3 6 Options switches table 3 3 Options switches Switch number ON position OFF position 1 Music mode Speech mode 2 Dual input Auto Mix Mic 1 In...

Page 18: ... allowed to converge more slowly to suppress the reverb components even more Position of the options switches The table below shows the recommended position of the options switches for the specific configuration set ups described in 3 1 table 3 4 Configuration set ups and options switches positions Configuration Position of the options switches switch 1 switch 2 switch 3 switch 4 Announcement set ...

Page 19: ...s deliver ed con nec ted for 230 V 1 2 3 4 1 2 3 4 Mic 2 In In Out Line Out Line Mic 1 Line In Mic Line On Off Ph an tom Mic 1 2 Sign al Le vel High Med Lin e Mic 2 In Sw itch 1 2 3 4 Mu sic mo de Du alin put voi cet rac kin g Mic 1In Mic 2In Pro ces s wit h bas s lift Acc ura te mo de Sp eec h mo de Sin gle inp ut Mic 2 L ine In Pro ces s flat Fas t mo de On Off N663 Thi s app ara tus mu st be ea...

Page 20: ...ll light up to indicate that the feedback suppression algorithm is active Increase the master volume to the desired level figure 4 1 Controls and indicators front Note It is recommended to test the gain margin by increasing the volume with another 3 dB to test for feedback should a higher volume be required later on Note Keep in mind that contrary to traditional feedback reduction systems the Plen...

Page 21: ... of the unit When howling noises are heard the Feedback Suppressor is operating at its feedback suppression limit In this case decrease the overall signal gain e g by decreasing the microphone gain on the mixing panel or by decreasing the master volume on the power amplifier 4 3 General recommendations to prevent feedback Ensure correct arrangement of microphones and loudspeakers Pay special atten...

Page 22: ...requency shift 5 Hz up Speech mode Masked noise Music mode 5 3 Inputs Line Mic input 1 3 pin XLR 5 pin DIN balanced Max input level 18 6 6 dBV Line Hi Med Lo level 18 30 42 dBV Mic Hi Med Lo level Impedance 10 kOhm 2 kOhm Line Mic CMRR 25 dB 50 Hz 20 kHz Phantom power 16 V Mic only switchable Priority control Loopthrough of pin 4 and 5 of DIN for microphones with priority switch Mic input 2 Mic 3 ...

Page 23: ... Priority control Loopthrough of pin 4 and 5 of DIN from inputs 5 5 Controls and indicators Power switch Bypass Active switch with yellow and green LED Calibrate button to start fast calibration cycle Signal indicators Overload 0 dBr red Present 40 dBr green Auto Mix enabled green Calibrate yellow 5 6 Environmental conditions Operating temperature range 10 to 55 C Storage temperature range 40 to 7...

Page 24: ...Bosch Security Systems 2003 11 9922 141 81681en Plena Feedback Suppressor Installation and Operating Manual en 24 ...

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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 ...

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