Kjb Dng-2300 User manual

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DNG-2300

Digitalwhitenoisegenerator

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UserManual

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Introduction

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Itiswell‐knownthatsoundpermeatesthroughwalls,doors,water,windowsandother

constructionsaswellasthroughvoids,cavitiesandventilationshafts.Thispropertyofmaterials

makesitpossibletointerceptconversationsconductedwithinpremiseswiththehelpofhighly

sensitivecontactmicrophones(electronicstethoscopes),windowlasersystemsorconventional

microphoneswithoutenteringthetargetarea.

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Wallcontactmicrophonescanpickupvibrationsfromtheplumbing,structures,walls,windows,

doors,floors,ceilingsandmore.Thelisteningdevicemaybeinanadjacentroom,orevenseveral

floorsorroomsawayattachedtoawall,pipeorotherfixture.Cavitiessuchasairducts,ventilation

shaftsorothervoidscanbeusedforinterceptingsoundfromanadjacentpremiseswithahelpof

conventionalmicrophones.Windowlasersystemsareableto"read"conversationsfromthe

premisesbysendingvisible,orinvisible,infraredbeamstotheglassandextractingthesound

vibrationsfromthereflectedrays.

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TheDNG‐2300generator,togetherwithitstransducersandspeakers,counteractsalltheabove

mentionedmethodsoflisteningbycreatingpowerful,non‐filterableinterferenceonthestructure

ofabuildingandwithinitsvoids.

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TheTD2300transducersareperfectlysuitedfortheDNG‐2300.Theyhaveanattractivedesign,

combineahighpoweroutputwithcompactnessandfitequallywellonwindows,wallsandother

structures.TheincludedmountingsetmakesitpossibletoinstalltheTD2300transduceronany

surface.Thetransducerpassesmostofthegeneratednoiseintothedesiredconstructioninthe

formofvibration,whilealsoproducinglessaudibleinterference.Thefrequencycharacteristics

optimallycorrespondtothespectrumofhuman'sspeech.

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Whiletransducersinjecttheirgeneratednoiseintosurfacesandstructures,stoppingthe

distributionofsoundthroughthem,theroleofaspeakeristofillvoids,cavitiesandventilation

shaftswithaudiointerferencetopreventleakageofsoundthroughtheair.TheSP2300isthe

recommendedspeakerfortheDNG‐2300.

Features

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Createspowerfulprotectionagainsttheleakageofalltypesofvibro‐acousticsbyinjectingnon‐

filterablenoiseintosurroundingstructuresandcavities

Suppresseswallcontactmicrophones,windowlasersystemsandwiredmicrophonesinside

walls,voidsandventilationshafts(airducts)

Isakeypartoftheprotectionsystemwhichalsoincludeswire‐connectedtransducersand

speakers

Generateswhitenoise–theoutputinterferenceisevenlydistributedthroughthespectrumofa

human'svoice

Has3independentoutputchannels:2xTRANSDUCERSand1xSPEAKERS

All3channelshaveindividualleveladjustment

EachTRANSDUCERSchannelcanfeedupto12transducersmountedonsolidstructures

(concrete/cement/bricks)andupto24transducersonlightstructures(glass,pipes,drywall,

wood)

TheSPEAKERSchannelcanfeedupto12speakers

TheMUTEcontrolinputallowstheusertoturnoffthespeakerstemporarily

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Specification

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Powersource110‐220V,50‐60Hz

Dimensions6x17,5x25,4

Weight2.2kg

Outputchannels2xTRANSDUCERS

1xSPEAKERS

Peakoutputvoltage12V

TRANSDUCERSoutput 

Max.outputpower 2x10W

Frequencyresponse180‐5600Hz

Minimalimpedanceofload3Ohm

Max.quantityoftransducersperchannel24(lightstructures)

12(solidstructures)

SPEAKERSoutput 

Max.outputpower 1x8W

Frequencyresponse180‐7000Hz

Minimalimpedanceofload8Ohm

Max.quantityofspeakers12

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Suppliedset

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TheDNG‐2300isakeypartoftheprotectionsystemconsistingofanoisegenerator,transducers

andspeakers.Whilethegeneratorcreatesthenoise,thewire‐connectedtransducersand

speakerspassitontotheconstructionsandcavities.Sincethequantityofthetransducersand

speakersmayvary,dependingonthedimensionsoftheroom,possiblevectorsofattackandtype

oftheconstruction(windows,waterpipes,cavities,etc.),itispossibletoorderthestandardset,

whichincludesonlythegenerator,andadditionallyorderanyquantityofthetransducersand

speakers.AnotheroptionistopurchasetheDNG‐KIT1setwhichincludesthequantityof

transducersandspeakerssuitableformostcommoncases(smallormedium‐sizedroomwith1

window).

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*Transducersandspeakerstobeorderedseparately

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Standard*DNG‐KIT1

NoisegeneratorDNG230011

ACpowercord11

TransducerTD23004Ohm 12

SpeakerSP2300 2

Carrycase1

Controls

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Frontpanel

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Figure1

1. Powerswitch

2. Levelindicator‐Channel1(TRANSDUCERS1)

3. Levelindicator‐Channel2(TRANSDUCERS2)

4. Levelindicator‐Channel3(SPEAKERS)

5. Level1adjustment‐Channel1(TRANSDUCERS1)

6. Level2adjustment‐Channel2(TRANSDUCERS2)

7. MutestateofChannel3(SPEAKERS)

8. Level3adjustment‐Channel3(SPEAKERS)

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Rearpanel

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Figure2

1. TRANSDUCERSoutputterminals–Channels1and2

2. MutingforChannel3(SPEAKERS):contactsopen–channelon,contactsclosed–channeloff

3. SPEAKERSoutputterminals–Channel3

4. ACpowerinput

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Installation

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Thecompleteprotectionsystemconsistsofthegeneratorandanumberoftransducersand

speakersuniformlyinstalledinaroomonthestructuresandwithintheaircavities.While

transducersinjectthegeneratednoiseintosurfacesandstructures,stoppingthedistributionof

soundthroughthem,theroleofthespeakersistofillvoids,cavitiesandventilationshaftswith

audiointerferencetopreventleakageofsoundthroughtheair.

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Carefullystudythepremisesforanypotentialpointsofacousticleakage.Notethemostsensitive

pointsfortheplacingofthetransducersandspeakers.Payattentiontothefollowingdetails:

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Structureoftheboundarywalls,ceilingandfloorandtheiraccessibilityfromoutside

Acousticisolationoftheentrancedoor

Windowsandtheirorientation

Presenceofpipes(theheatingsystem,watersupply,fireextinguishingsystem)

Presenceofvoidsconnectedwiththeadjacentrooms

Ventilationshaftsgoingoutofthepremises

Presenceofanyotheracousticleakagechannels

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Quantityandarrangementoftransducers

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Thereare2availableversionsoftheTD2300transducers.Thehigh‐power,4OhmTD2300,is

especiallygoodforsolidsurfacessuchasconcrete,cementorbrickceilingsandfloors,althoughitis

universalandcanbemountedonlightersurfaces.

Theeasy‐to‐wire16OhmTD2300suitslightsurfacessuchaswindowglass,wood,drywall,plaster

andpipes.

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Toestimatethequantityoftransducersusethefollowingsuggestions:

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OnwallstheTD2300transducersshouldbeinstalledevery2‐3meters,centeredbetween

floorsandceiling.Ifitisnecessarytopositionthetransducersclosertothefloororceiling

becauseofinteriordesigndemands,selectalesserdistancebetweenthetransducers.

Onfloorsandceilings–shouldbeinstalledevery6squaremeters

Onwindows–oneachwindowpane

Doors–One,placedadjacenttothecenterhingeonthedoorframe

Waterpipes–oneachpipegoinginandoutofthepremises

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Wiringandconnectionoftransducers

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Whenthequantityoftransducersisestimatedandtheyaregroupedbythesurfacetype,itis

possibletoselectthewiringvariant.Dependingonthenumberoftransducersneeded,choosea

wiringdiagramfromthebelowpictureforeachchannelofthenoisegenerator.

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TD23004Ohmtransducers

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Toprovideanequaloutputpower,andtofollowthedemandsofoutputimpedance,theTD2300

4Ohmtransducersareunitedasacombinationofserialcircuits(chains)connectedinparallel.

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Theoutputpowerisdividedbetweenthetransducersandisinquadraticdependenceontheir

quantityinaserialchain.Thepercentage%showstherelativepowerproducedbyatransducer,

comparingtothe"basic"variantwith2seriallyconnected4Ohmtransducers.

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Quantityof

transducersina

serialchain

Relativepowerproducedby

4Ohmtransducer

Typeofsurface

2100%Solid

344%Solid

425%Solid/Light

516%Light

611%Light

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Thepercentagereflectstherelativepower,whiletherealoutputwilldependonthegenerator's

volumecontrol(LEVEL).Thetransducerswithahigherrelativepowercanbeinstalledonanytypeof

surface,includingthelightconstructionifthecorrespondingoutputissettoalowerlevel.

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Itisrecommendedtopassmorepowertothetransducersmountedontosolidsurfacessuchas

concrete/cement/brickwall,ceilingandfloor.Inthiscasethequantityofseriallyconnected

transducersineachchainshouldnotexceed3‐4pcsfor4Ohmversion.

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Lightsurfacessuchaswindowglass,wood,drywall,plasterandpipesusuallydemandlesspower

andallowfortheconnectionofmoretransducersinaseries(upto6).



    

 

 

  

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Thetransducersmarkedas100%,44%and25%canbemountedonsolidsurfaces.Thetransducers

markedas11%,16%and25%‐onthelightsurfaces.

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TD230016Ohmtransducers

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QuantityofRelativepowerproducedby Typeofsurface

transducersina

serialchain

16Ohmtransducer

1100%Solid

225%Solid/Light

311%Light

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  

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

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AssignmentofTRANSDUCERSoutputs

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TheDNG‐2300hastwoTRANSDUCERSoutputs,eachcapableoffeedingupto12‐24transducers

dependingonthedensityofstructures.

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Groupingthetransducersbythedensityofstructure(solidorlight)andconnectingthemtoa

separateoutputchannelwillallowyoutoadjustthelevelforeachgroupseparately.Forexample,

output“TRANSDUCERS1”canbededicatedtosolidsurfaces(upto10‐12transducers),whilethe

output“TRANSDUCERS2”‐tolightsurfaces(upto24transducers).

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Whentherearemanysolidstructuresintheroom,itmaybenecessarytoinstallmorethan10‐12

"solid"transducers.Inthiscaseitispossibletosharethesecondoutputbetweenthe"light"and

"solid"transducers.Takingintoconsiderationthatthecombinedoutputshouldproduceahigher

powerandlightstructures,beinggoodconductorsofsound,demandalesserportionofnoise,itis

recommendedtochangethestandardconnectionschemesothatthe"light"transducersare

connectedinlongerserialchains.

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Attention:

Resistanceoftheentireloadshouldnotbelowerthan3Ohmper‘TRANSDUCERS’channel.

DamagetoyourDNG‐2300mayoccurifimproperlywired.



Beforeconnectingtothegenerator,measuretheresistanceoftheentirecircuitwithamultimeter.

Youcanalsocalculatetheresistanceoftheentireloadbyconsideringtheresistancemarkedonthe

transducerandbyusingthefollowingformulas:

ResistanceofaserialcircuitiscalculatedasR=Rt*n,whereRtistheresistanceof

transducerandnisthequantityoftransducers.

Example:resistanceof3transducers(each4Ohm)connectedinseriesis4+4+4=12Ohm

ResistanceofaparallelcircuitiscalculatedasR=1/(1/R1+1/R2…1/Rn)

Example:resistanceof3parallelcircuitseachconsistingof3serial4Ohmtransducersis

R=1/(1/12+1/12+1/12)=1/0.25=4Ohm



Mountingthetransducers



TheTD2300transducersaresuppliedwithanumberofaccessoriesallowingdifferentmethodsof

installation.Themethodofmountingisselecteddependingonthetypeofsurface.

Directscrew(wood)

Plasticdowel(cement,concrete,bricks)

Wallanchor(bricks,drywall,fragilematerials)

Mountingdisk(windowglass)



Theaccessoriesformountingonpipesshouldbepurchasedseparately:interlockedhoseclamp100‐

150mm,boltM4x8,washerandnut.



Itisrecommendedtoreadthemanualsuppliedwiththetransducerbeforestartinginstallation.



Quantityandarrangementofspeakers



Behinddroppedceiling‐1xSP2300speakerforeach9‐10squaremeters

Inventilationshafts,airductsandothervoids–1xSP2300foreachvoid



SincetheSP2300isassembledfrom3parts,eachbeingaseparatespeaker,itispossibletousethe

3individualpartsforsmallervoids.DisassembletheSP2300byremovingthetriangularholder,cut

thecables,placetheseparatespeakerpartswherenecessaryandreconnecttheminseries.



ConnecttheSP2300speakersinparallelwhenthereis1,2or3pieces.Foralargerquantity

combinespeakersinserialpairs.Youcanconnectupto6pairs(12pcstotal)



  



 



Attention:Considertheminimumloadof8Ohmforthe‘SPEAKERS’outputswhenusingthe

modifiedwiring.DamagetoyourDNG‐2300mayoccurifimproperlywired.



Mountingthespeakers



Inmostcasesthespeakersdonotrequiremountingandshouldbeplacedinsidevoidsorshafts.If

thevoidisnotlargeenoughtoaccommodatethespeakerasis,thespeakercanbedisassembled

andplacedinsidewithoutthetriangularholder.

Ifthereisnohorizontalspacesufficientforthespeaker,itcanbehungonasteelcable.



Adjustmentoflevel



Afterthetransducersandspeakershavebeeninstalledandconnectedtothegenerator,itis

necessarytoadjustthelevelofnoise.ThefrontpaneloftheDNG‐2300containsthecorresponding

regulators:

LEVEL1–TRANSDUCERS1

LEVEL2–TRANSDUCERS2

LEVEL3–SPEAKERS



FortheTRANSDUCERSchannelsitisrecommendedtoselecttheleveldependingonthetypeof

structureandquantityoftransducers.



StructureQuantityLEVEL

Solid1…6 50‐70%

Solid7…12 70‐100%

Combinedsolid+

light

10…2470‐100%

Light1…630‐50%

Light7…1250‐70%



FortheSPEAKERSoutput(LEVEL3)itisrecommendedtoselecttheleveldependingonhowmany

speakersareconnectedandwhatspacetheycoverwiththenoise.Largerspacestypicallyneeda

higherlevelofnoise.



QuantityLevel

1…450‐70%

5…870‐80%

9…12 80‐100%



Minimizingaudibleinterference



Whenthegeneratorisactiveandthetransducersareinjectingthegeneratednoiseintothe

structures,acertainportionofvibrationsissentintotheairsotheusercanhearthenoise.Despite

beingaudible,thisisjustasmallpartofthenoiseandmostoftheenergyisbeingsentintothe

structures,however,theusermaywanttominimizetheaudibleinterference.Thiscanbeachieved

bysettingtheoptimallevelofnoisewhichissufficientforjammingallperimeter‐boundbugging

devices.(Pleasenotethisisonlypossiblebyusingauxiliaryequipment)



Withthehelpofauxiliaryequipment(anacousticleakageprobe)itispossibletoverifyiftheDNG‐

2300isproducingasufficientlevelofnoiseandminimizetheaudiblelevelincertaincases.An

acousticleakageprobeissimilartoawallstethoscopeandisdesignedfortheevaluationofhow

soundisdistributedthroughstructures.



CreatearecognizablesoundsourceintheroombyturningonaTV,radioorportablespeakerwith

thevolumeproportionaltothatofhumanvoices,oraskanassistanttoreadamagazineoutloud.



Usetheacousticleakageprobe(fromanadjacentroomorfromoutsidethebuilding)andlistento

thesoundinsidetheprotectedroom.Probedifferentstructures–walls,floor,ceilingsandother

constructionsadjacenttothetargetroom.Probetheventilationshaftsandothervoidsgoingfrom

theprotectedroom.Searchforthemostsensitivepointswiththesignsofsoundleakingfromthe

room.



Oncesetup,activatethegeneratorandrepeattheaudioprobingatthemostsensitivepoints.Try

tofindtheoptimallevelofnoiseforeachchannelbyincreasinganddecreasingitslevel.Ifduring

probingyoucanrecognizethespeechpresentinsidetheprotectedroom,itisnecessarytoincrease

thelevelofnoiseonthechannelresponsibleforthecorrespondingtransducer/speaker.



Sometimesitisnotpossibletoprobetheroomfromallsidesorbehindallstructuresduetolimited

access.Inthiscaseitisrecommendedtokeepthedefaultrecommendedlevelsforthechannels,

whichcannotbeverifiedfullybutshouldbesufficienttoofferprotection.



Ifduringprobingyoucanstillhearthevoice/voicesandcanrecognizewhatisbeingsaidafterthe

levelhasbeensetto100%,itmaymeanthequantityoftransducers/speakersisinsufficientortheir

placementisincorrect.Increasethequantityoftransducers/speakerstoachieveuniformcoverage

ofallconstructions/surfaces/voidsasdescribedinthismanual.



Pleasenote:TheDNG‐2300systemwasdesignedasareliablecountermeasureagainstvibro‐

acousticleakage;itshouldnotbe,inanyway,expectedtoperformasprotectionagainstother

waysofeavesdropping.



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