AUDAC AMP20 User manual

AMP20
User Manual
www.audac.eu

2

3
Index
Introduction 5
Precautions 6
Safety requirements6

Caution servicing7
EC Declaration of Conformity    7
Waste of Electrical and Electronic Equipment (WEEE) 7

Chapter 1: Connections and connectors 9
Connection standards 9
Chapter 2: Overview AMP20 11
Front panel 11
Rear panel 12

Chapter 3: AMP20 Quick start guide 14
Connecting the AMP20 14
Configuring the AMP20 15
Ready 15
Chapter 4: Technical specifications 16

4

5
Introduction
Mini Stereo Power Amplifier
TheAMP20isaMiniStereoPowerAmplifierwithapowerratingof2x15Watt,which
lendsitselfperfectlytosmallspeakersystemsrequiringcompactandeconomicalaudio
solutions.Itofferstheidealsolutionforapplicationssuchasclassrooms,officesand
meetingroomswhereasmallamountofspeakersarerequired.
Thecompactsizeandveryhighefficiencymakesitperfectlysuitedtobehiddenina
closet,onafalseceilingormountedunderadeskortable.
Thecombinationofthestereobalancedlineandmicrophoneinputmakeitperfectly
suitedforapplicationswhereitshouldbeusedincombinationwithprojectionscreens
andvideosourceswhileamicrophoneisconnected.Twogainpotentiometersmakeit
possibletocontrolthesensitivityandbalancebetweenmusicandspeech,whileaswitch
allowsbridgingoftheoutputchannelstoobtainonechannelwithmergedoutputpower.
Aremotewallmixercanbeconnectedforapplicationswherelocalmixingoftheinputs
isdesirable,whilelargedistancescanbecoveredbetweenthesourceandamplifier
usingsimpleCAT5twistedpaircabling.Thevolumecontrollerinputallowsconnection
ofanadditionalwallcontrollerforoverallvolumecontrol.
TheClass-DAmplifiertechnology,standbymodeandincludedswitchingpowersupply
makesthisdevicecomplianttoEnergyStar3.0andotherstrictenergyefficiencyand
environmentalrequirements.

6
Precautions
READ FOLLOWING INSTRUCTIONS FOR YOUR OWN SAFETY
• ALWAYSKEEPTHESEINSTRUCTIONSFORFUTUREREFERENCE.NEVER
THROWTHEMAWAY
• ALWAYSHANDLETHISUNITWITHCARE
• CLEANONLYWITHDRYCLOTH
• HEEDALLWARNINGSANDFOLLOWALLINSTRUCTIONS
• NEVEREXPOSETHISEQUIPMENTTORAIN,MOISTURE,ANYDRIPPINGOR
SPLASHINGLIQUID.NEVERPLACEANOBJECTFILLEDWITHLIQUIDONTOP
OFTHISDEVICE
• DONOTINSTALLTHISUNITNEARANYHEATSOURCESSUCHASRADIATORS
OROTHERAPPARATUSTHATPRODUCEHEAT
• DONOTPLACETHISUNITINENVIRONMENTSWITHAHIGHLEVELOFDUST,
HEAT,MOISTUREORVIBRATION
• THISUNITISDEVELOPEDFORINDOORUSEONLY.DONOTUSEITOUTDOORS
• PLACETHEUNITONASTABLEBASEORMOUNTITINASTABLERACK
• ONLYUSEATTACHMENTS&ACCESSORIESSPECIFIEDBYTHE
MANUFACTURER.
• UNPLUGTHISAPPARATUSDURINGLIGHTNINGSTORMSORWHENUNUSED
FORLONGPERIODSOFTIME
• CAREFULLYCHECKTHEUNIT’SCONDITIONAFTERUNPACKING.
IFTHEREISANYDAMAGETOTHECARTONBOXORTHEUNITITSELF,
INFORMYOURVENDORIMMEDIATELY.
• ONLYCONNECTTHISUNITTOAMAINSSOCKETOUTLETWITHPROTECTIVE
EARTHINGCONNECTION
• THEINSTALLATION,CONNECTIONANDCONFIGURATIONOFTHEDEVICE
SHOULDBEDONEBYQUALIFIEDTECHNICIANS

7
CAUTION
• USECABLESOFTHERIGHTGAUGEFORCONNECTINGLOUDSPEAKERSTO
THEAMPLIFIEDOUTPUTS
• USECABLESWITHCLEARCOLOURCODINGINDICATINGTHEPOLARITYAND
MAINTAINTHESAMEPOLARITYTHROUGHOUTTHEWHOLESYSTEM.
• ONLYUSETHECORRECTLOADIMPEDANCE(MIN4OHM)WHEN
CONNECTINGLOUDSPEAKERSTOTHEAMPLIFIEDOUTPUTS.EXCEEDING
THESELIMITSCOULDCAUSEFIREOROTHERFAILURES.
• DONOTCONNECTINDUCTIVELOADSDIRECTLYTOTHEAMPLIFIEDOUTPUTS
• AVOIDELECTRICSHOCKS:SWITCHOFFTHEAMPLIFIERWHENCONNECTING
CAUTION - SERVICING
Thisproductcontainsnouserserviceableparts.Referallservicing
toqualifiedservicepersonnel.Donotperformanyservicing
(unlessyouarequalifiedtodoso.)
EC DECLARATION OF CONFORMITY
Thisproductconformstoalltheessentialrequirementsand
furtherrelevantspecificationsdescribedinfollowingdirectives:
2004/108/EC(EMC)and2006/95/EC(LVD)
WASTE ELECTRICAL AND ELECTRONIC EQUIPMENT (WEEE)
TheWEEEmarkingindicatesthatthisproductshouldnotbe
disposedwithregularhouseholdwasteattheendofitsproduct
life.Thisregulationiscreatedtoprotectboththeenvironment
andhumanhealth.
Thisproductisdevelopedandmanufacturedwithhighquality
materialsandcomponentswhichcanberecycledand/orreused.
Pleasedisposeofthisproductatyourlocalcollectionpointor
recyclingcentreforelectricalandelectronicwaste.Dothisto
makesurethattheproductisrecycledinanenvironmentalfriendly
way,andhelptoprotecttheenvironmentinwhichwealllive.

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9
Chapter 1
Connections and connectors
CONNECTION STANDARDS
The in- and output connections for AUDAC audio equipment are performed
correspondingtointernationalwiringstandardsforprofessionalaudioequipment.
Cinch (RCA):
Forunbalancedlineinputconnections
Tip: Signal  Sleeve:  Ground
White: Left  Red: Right
XLR:
Forbalancedinputconnections
 Pin 1: Ground
 Pin 2: Signal+
 Pin 3: Signal-
3-Pin Euro-Terminal Block:
Forbalancedinputconnections

 Left: Signal- (XLRPin3)
 Center: Signal+ (XLRPin2)
 Right:  Ground  (XLRPin1)
Forbalancedinputconnections:

10
Forunbalancedinputconnections:
REMOTE WALL MIXER RJ45 (Audio, +8V DC, -8V DC):
ForconnectiontoRemoteWallMixers(AudioInput&Mixing)

Pin 1  White-Orange  AUDIOLeft+
Pin 2  Orange   AUDIOLeft-
Pin 3  White-Green  +8VDC
Pin 4  Blue   -8VDC
Pin 5 White-Blue  GND
Pin 6  Green   GND
Pin 7  White-Brown  AUDIORight+
Pin 8  Brown   AUDIORight-
VOLUME CONTROLLER RJ45:
Forconnectiontowallmountedvolumecontrollers(Overallvolumecontrol)
Pin 1  White-Orange  N/C
Pin 2  Orange   N/C
Pin 3  White-Green  -8VDC
Pin 4  Blue   0~-8VVariablein
Pin 5 White-Blue  GND
Pin 6  Green   GND
Pin 7  White-Brown  N/C
Pin 8  Brown   N/C
ATTENTION
Thetwistedpaircablingmustalwaysbe‘straight’.Incase
ofselfmadecabling,itmustbewiredasdescribedabove,
tomakethesystemworkproperly.

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Chapter 2
Overview AMP20
Front panel
MIC LINE
SIGNAL CLIP
ON /
STANDBY
STEREO
MONO /
BRIDGE

ThefrontpaneloftheAMP20containsallthecontrolandindicatorfunctions.
Twogaincontrolpotentiometersareprovidedwithwhichthegainofthelineand
microphoneinputscanberegulatedseparatelyandthebalancebetweenthemusic
andspeechcanbeset.
AslideswitchprovidesthepossibilitytoswitchtheamplifierbetweenStereoand
Mono/Bridgemode.Ifthisswitchissettostereo,theoutputwillbestereo.Ifitsset
toMono/Bridge,theLeftandRightchannelswillbesummedtoadual-monooutput.
ThreeindicationLED’sfor‘ON/STANDBY’,‘SIGNAL’and‘CLIP’indicatetheoperation
modeoftheamplifier.The‘ON/STANDBY’LEDwillturngreenwhenthedeviceis
switchedONandrunning.Whennosignalwithasufficientlyhighlevelisdetected
foracertainperiodoftime,itwillswitchtostandbymodeandthisLEDwillturn
orange.The‘SIGNAL’LEDwillturngreenwhenasignalwithasufficientlyhighlevel
isdetectedandthe‘CLIP’LEDwillstartblinkingwhenthesignalreachedtheclipping
levelandtheinternallimiterstartsworking.

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
AllnecessaryconnectionsoftheAMP20areprovidedatthebacksideofthedevice.An
overviewandexplanationofalltheconnectorsandpossibilitiesisgivenbelow.
1) 24 Volts power connector:
The24VoltspowersupplyconnectionisprovidedontheleftsideoftheAMP20’srear
panel.Theincludedpowersupply(PSD241)shouldbeconnectedtotheterminalblock
connectors.Payattentiontothepolaritywhenconnectingthepowersupply.
2) Loudspeaker output:
Theloudspeakersshouldbeconnectedtothe4-pins‘AMPOUT’TerminalBlock
connector.DependingonthepositionoftheStereoandMono/Bridgeswitchon
thefrontpanel,thecorrespondingaudiooutputwillbeavailablehere.Whenused
inStereomode,theleftloudspeaker(s)shouldbeconnectedtothetwoleftmost
terminalsandtherightloudspeaker(s)shouldbeconnectedtothetworightmost
terminals.WhenusedinBridgemode,theloudspeaker(s)shouldbeconnectedtothe
twoouterterminals.
3) Remote wall mixer and Volume controller connections:
TwoRJ45connectorsareprovidedforconnectingRemotewallmixersandexternal
overallvolumecontrollers.Theconnectionsontheseextensionportsshouldbemade
byusingasimpleCAT5twistedpair(orbetter)cableinastraightpinoutconfiguration.
ThepinoutandcolourcodingisdescribedonChapter1ofthisinstructionmanual.
Theremotewallmixerconnectioncarriesthesupplyvoltagetothewallinputunitand
astereodifferentialaudiosignalfromthewallinputunittotheamplifier.
Rear panel
GND L+ L-
GND
R+
R-
REMOTE WALL
MIXER
VOLUME
CONTROLLER
GND
+
-
AMP OUTPOWER
GND +24V
BRIDGE
LEFT RIGHT
MIC
LINE
GND

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Theaudiosignalcomingfromtheremotewallmixerwillbeproportionallymixedwith
thedirectlineandmicrophoneinputs.
Thevolumecontrollerconnectioncarriesanegativesupplyvoltagetotheexternal
volumecontrollerandhasaninputforavariablenegativevoltage.Dependingonthis
voltage,theoverallvolumewillberegulated.Whennoexternalvolumecontrolleris
connected,theoverallvolumeofthedevicewillbedefaultedtoitsmaximum.
4) Balanced Stereo Line and Microphone inputs:
Thebalancedstereolineandmicrophoneinputareperformedusing3-pinsterminal
blockconnectors.
Alldifferentkindsofbalancedandunbalancedlinelevelaudiosourcescanbe
connectedtothelineinputs.SomeexamplesareCD&MP3players,Tuners,Laptops,
DVDplayers,...
Themicrophoneinputprovidesthepossibilityofconnectinganykindofmicrophone
withoutphantompowerrequirement.

14
Chapter 3
AMP20 Quick start guide
This chapter guides you through the setup process for a basic AMP20 project whereto
a line level audio source and a microphone are connected directly . An external volume
controller and remote wall mixer are installed remotely.
Overview of the AMP20 setup
Connecting the AMP20
1) Connecting audio inputs
Connectallyouraudiosources(CD&MP3players,tuners,microphones,...)tothe
audioinputsoftheAMP20.Allthedirectaudioinputsareperformedusing3-pins
terminalblockconnectors.Formoreinformationabouttheconnectionsandwiring
pinout,checkChapter1ofthismanual.

15
2) Connecting audio outputs
Thissuggestedapplicationusesatotaloffourloudspeakers.TheAMP20contains
twospeakeroutputs(stereo)meaningthattwospeakersshouldbeconnectedon
everyamplifiedoutput.Thespeakersmustbeconnectedinparallelandtheloadon
eachamplifieroutputchannelshouldbe4Ohmorhigher.
3) Connecting the external units
Theexternal(optional)wallvolumecontrollersandremotewallmixersshouldbe
connectedtothecorrespondingRJ45connectorports.Theconnectionsshould
bemadebyusingsimpleCAT5twistedpair(orbetter)cablinginastraightpinout
configuration.ThemaximumcablelengthbetweentheexternalunitsandtheAMP20
maynotexceedatotalcablelengthof100meters.

4) Connecting the power supply
Theincludedpowersupplyshouldbeconnectedtothe2-pinsEuroTerminalblock
connector.Watchthepolaritywhenconnectingthepowersupply.
Configuring the AMP20
1) Adjusting the input sensitivity & volume
TheconfigurationoftheAMP20onlyincludesthesensitivityadjustmentoftheinputs
andtheoverallvolumeregulation.Thesensitivityoftheinputscanberegulatedbythe
twopotentiometersonthefrontpaneloftheAMP20.Thecorrectregulationdepends
onthesignalleveloftheconnectedsourcesandtherequirementsforeachspecific
application.Theregulationshouldbedoneexperimentally,makingagoodbalance
betweenthemusicsignalfromtheaudiosourceandthespeechfromthemicrophone.
Thelineandmicrophonelevelsignalcomingfromtheremotewallmixerismixed
locallyandthebalancecanbesetusingbothpush-lockpotentiometers.Theoutput
levelcanbesetusingthebigvolumedial.Thissignalismixedwiththedirectlineand
microphoneinputsatequallevels.
Afterallsensitivitysettingshavebeenmade,theoverallvolumecontrolcanbedone
usingtheVC3008/4008volumecontroller.
Ready
Yoursystemisnowreadyforuse.

16
Chapter 4
Technical specifications
Inputs   Type  Stereo Balanced Line
   Connectors 2x3-pinsEuroTerminalBlock~3.81mm
   Impedance 20kOhm
   Sensitivity -12dBV~+10dBV
   Type  Balanced Microphone
   Connectors 3-pinsEuroTerminalBlock~3.81mm
   Impedance 47kOhm
   Sensitivity -34dBV~-18dBV
Output   Type  Stereo Loudspeaker Output
   Connectors 4-pinsEuroTerminalBlock~5.08mm
   Impedance MinLoadof4Ohm
   Power  2x7.5Watt@8OhmStereo
     2x15Watt@4OhmStereo
     1x30Watt@8OhmBridge
THD+N     <0.1%
Crosstalk    -75dB
Signal/Noiseratio   >95dB
Powerconsumption Standby  0.8Watt
   Nominal(1/8MUP) 5.3Watt
   AbsoluteMax 35Watt
Efficiency  1/8MUP  70%
   MUP  87%
Cooling     Passive
Protection    Over-Heat
     Shortcircuit
     Limiter
AutoPowerDown  Minimumsignal -46dB
   Timing  Max90Seconds

17
Powersupply    24VDC
PSD241switchingpowersupplyincluded
     100~240VAC/47~63Hz
NOTE:‘MUP’standsforMaximumUndistortedPower
Dimensions(WxHxD)   108x44x164mm
Weight     0.80Kg  
Packaging    Cartonbox
Shippingweight&Volume   1.12Kg-0.0078Cbm
OptionalAccessories VC3008/4008 RemoteVolumecontroller
   WP523  RemoteWallMixer
   MBS200  MountingBracket
   CLA832  RCA/CinchtoTerminalBlockcable
   CLA835  XLRFemaletoTerminalBlockcable
   TR3030  100VLineTransformer30Watt

18
Notes

19
Notes

20
Notes