Audionet AMP III User manual

audionet
amPIII
Stereo -Amplifier
Owner'sManual

2
Congratulations!
Audionetisproud towelcomeyou intheworldofgermanhigh-end au-
dio!YourAudionetAMPIII isdesignedfornaturaland audiophilemusic
reproduction inconjunction withsafe operation and perfectlong-term
stability.TheAMPIII combinesexcellenthigh-frequencycapabilities
with totalcontrolofyourloudspeakers.
Therefore,it isideallysuitabletobecombinedwiththeAudionetSAM
mainamplifier for"bi-amping".Furthermore,inconjunction withthe
AudionetPREIpreamplifier it formsaworld-class high-end combina-
tion.
First,pleasereadthemanualand theprecautions carefully.TheAMPIII
isacomplexunit and offerssomeuncommon features!Incaseofdiffi-
culties, pleasedo nothesitatetocontactyourdealer orourfactorydi-
rectly!

3
Installation and powersupply
Pleasefind aplace foryourAudionetAMPIII thatissufficientlyventi-
lated to allowtheheatto dissipate.
Connectthepower jackattherear toyourwall outlet.You shouldeither
usetheprovidedpower cordoranother oneallowedforyourhomecoun-
tryspecifications. Tuningwith"audiophile"power cords canleadtoim-
proved sound field. Ask yourdealer forassistance.
NOTE:Thepower specificationsontherearmustmeet to yourhome
countryspecifications. TheAMPIII isaClass I-systemand mustbe
earthed. Pleaseensure a stableearthconnection.
YourAudionetAMPIII isabletodetectawrongpolarizingofthemains.
Ifyou see thefrontlamp flashingquicklywhen poweringon, flip theplug
in yourwall outlet(also see below).
Additionally,on therear panelyou find amark"phase"nexttothemains
connector.Ifyou havetheoptional"AudionetPower Cord",APC,the
phaseis also marked on thewall plugitself.
Thecorrectpolarizingofthemains isimportantforreasons ofaudioclar-
ityand stability.
Placing
Connecting
Mainsphase detection

4
Inputs and Outputs
Foraddingorremovingconnections yourAMPIII mustbe
switched off!
Pleasemakesure thatall cablesare inabsolute bestcondition.Bro-
kenshieldsorshort-cutloudspeaker cablescoulddamageloud-
speakers ortheamplifier!
AtfirstconnectyourAMPIII toyourpreamplifier.Normally,theinputs
labeled "directin"should beused forthis purpose.
Additionally, theAMPIII is equipped with an AC-coupled input.
UsingthisinputremovesaDC-offset(directcurrent)fromthesignalof
thepreamplifier byahigh-gradecapacitor.
You shouldusethis"ac-coupledin"only,ifyou haveproblemswith
D.C., whichare notunlikelyespeciallywithactivecrossovers. Bycon-
nectingthesource totheseinputsyou preventaDC-currentflowing
throughtheloudspeaker woofersdecreasingsound dynamicand quality.
InextremecasestheAMPIII mightevenshutdownshowingthe"DC"
flash code(see below).
TheAudionetAMPIII canbeconnectedtoother power amplifiersfor
"multi"-amping.Forthispurposethesignalsfromtheinputare routed
back to theoutputlabeled "out".
Connecttheleftand rightspeakerstothegoldplatedWBTterminalson
therear.Pleasemakesure thattheredoutputs(+) oftheamplifier are
connectedtothepositiveinputsoftheloudspeakers(usuallyred)and the
whiteoutputs(-) are connectedtothenegativeloudspeaker inputs(usu-
allywhiteorblack).
Inputs
Loop output
Speakers

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Wrongspeaker polarization will result in severe loss ofsound quality!
Thenominalloudspeaker impedance mustbe4 ohms orhigher.
AlthoughtheAMPIII hasaprotection circuit topreventdamageofthe
system, switch off theunit whileworkingon theloudspeaker cables.
Never useforce ortools tighteningtheterminalscrews!
Forbi-wiringtheloudspeakerswithyourAudionetAMPIII pleaseuse
twoloudspeaker cablesand removethe"bridge"atthespeaker terminals.
Insertthe"tweeter"cablefromtherear usingbananaplugsand mountthe
"bass"cablefromtheside. In doubtpleaseask yourdealer forassistance.
A6.3mm headphonejackislocatedon therear ofyourAMPIII.The
signalon this socketis permanentlyactiveand cannotbeswitched off.
Pleasebeaware thatlisteningmusicviaheadphonescanseriouslydam-
ageyourears!Theprogramcan startsuddenly!
Headphones

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Ifyourspeakerssupportbi-wiring,connecteachspeaker with2separate
speaker cables. Bi-wiringcanimprovetheimpulseresponseand spatial
resolution ofyourspeakers.
TheAMPIII istheidealpartner forbi-amping.Incombination witha
second amplifier (e.g.AudionetSAM),thelowrangeand themid/high
rangesection ofyourspeakers can bedriven byseparateamplifiers.
Before you useyoursystemin abi-ampingsetup, pleaseask themanufac-
turer ofyourspeakers, iftheyare abletoworkinabi-ampingenviron-
ment, and ifanymodifications orspecialsetup procedures are necessary.
Warning:Youmustremovethejumpersconnectingtheterminalsof
thelowrangeand mid/highrangeinputsofyourspeakers. Before
switchingonyoursystemforthefirsttime,pleasemakeabsolutely
sure,thatthejumpershavebeenremoved.Otherwisebothamplifi-
ers are shortedagainsteachother and will bedestroyed!
Bi-Wiring
Bi-Amping
Speaker terminal
+
-
mid/high range
l
ow
range
SAM
AMPIII
+
-
+
-
Warning!
Remove
jumpers!!

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Operating
Please,atfirstturndownyourpreamplifier.Thenbringthemainswitch
attherear inthe"on"position. Theswitchislocatedabovethemains
socket. NowtheAMPIII is in stand-bymode.
ForswitchingyourAMPIII on and off,pleaseusethepower button at
thefrontpanelfromnowon. Themainswitchdoesnotneedtobeoper-
atedunless you are absentforalongtime.Itmustonlybeoperatedwhile
theAMPIII is in stand bymode.
Asmentionedabove,yourAudionetAMPIII isabletodetectawrong
polarizingofthemains. Theindication isdonebythefrontLEDbetween
thetouch ofthe"power"ball and the"click"oftheloudspeaker relays.
Ifthepolarizingiscorrect,theLEDflashesÄ_____Ä_____Äetc.
However,ifyou shouldobserveafastsignalÄ_Ä_Ä_Ä_Ä_Äetc., flip
theplugin yourwall outletafter havingswitched off theAMPIII.
WhentheAMPIII isin stand-bymodeits power can becontrolled byany
Audionetpreamplifier usingthe"Audionetlink".Thisfeature isde-
scribed in thepreamplifier manuals, too.
You onlyneedasimpleoptical"Toslink"cable.Connectoneofthepre-
amplifier outputs"AudionetLink"withthe"Link"inputofyourAMPIII.
NowtheAMPIII power followsthepreamplifier.Lengthofthe"Tos-
link"cableisnotcritical-so you canplace theAMPIII nexttothe
speakers ifyou prefer!
Power
Mainsphase indicator
AudionetLink

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Protection system
YourAudionetAMPIII isequippedwithoneofthemostpowerfulpro-
tection circuitsavailableon themarket.Sixerrorsare distinguishedand
indicated bythefrontLEDusinga"morse"likecode:
•••Overload left
•• ¾Overload right
• ¾•Temperature error
¾••High-Frequencyerror
¾¾•DCerrorleft
¾¾¾DCerrorright
Incaseofanerrorbeingindicatedpleasecheckthecausereferringtothe
followingtable:
¨ Overload:Short-circuit ofaloudspeaker cableorloudspeaker defect.
¨ Overtemperature:Pleasefree thetop and bottomventilation slots!
¨ HFError:HFoscillation, pleasecheck yourinputsource.
¨ DCError:Dangerous DC-voltageattheoutput: Defectpreampor
activecrossover carryingDC.Pleasetryconnectingthesource tothe
inputs "ac-coupled in"(see above).

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Specialities
ForoptimizingtheHigh-FrequencycapabilitiesAudionetconsequently
usesSurface-MountedDevices(SMD).Asaresult thefaster and more
compactcircuitsenabletheengineer touselow-straw and extremeshort
wiring. Theverygood dampingfactoris aresult ofthis, forinstance.
There are separatetransformer windingsand filtersforpre- and power
circuitrytoensure maximumload-independence.Themaintransformer is
rated700VA and drivestwoloadcapacitorsfrom"Audionet"
(2x41.000µF). All 16 rectifyingdiodes are ultra-fast"schottky"-types.
TheAMPIII iscontrolledand supervisedbyapowerfulInfineon micro-
controller.Itchecks themains phase,detectserrorsofthepower stagesin
timeand indicatesthecauseunambiguously.Of courseit isdrivenbyan
oversized power supplyofits own.
IntheinputstageAudionetemploysalow-noisemonolithicDual-FET. A
dualdifferentialgainstagefollowsfeedingmultiplebootstrappedemit-
ter-followers, whichdecouplethepower stagesfromthevoltagegain
stages perfectly.
Afastarithmeticcorrection circuit locallyensuresthatdistortion ofthe
power stagesiseliminatedatonce.ThefastAmerican"IR"Power-
MOSFET-Transistorsensure powerfulloudspeaker controland longterm
stability.
Construction
Powersupply
Microcontroller
Circuitry

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Precautions and Care
¨ Preventchildren fromplayingwith plasticbags!
¨ Pleasestore and operatetheunit inadryroomatareasonableroom
temperature
¨ Avoid moisture oranyliquid to getinto theunit
¨ Setup theunit in afree position. Do notcover thetop.
¨ Donotopenthecase.Nouser serviceablepartsinside.Unauthorised
openingwill causealoss ofwaranty.
¨ Do notshort-circuit theoutputterminals.
¨ Pleaseuseadrycloth forcleaning
Wewish you manyexcitinglisteningexperienceswithyourAudionet
products!
Ifyou needfurther information aboutourproductspleasedo nothesitate
to contactyou localAudionetdealer orus directly!
YourAudionetTeam

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Technical Data
FunctionHigh-EndStereoPower Amplifier
Power2x110 Wattsinto8W
2x200 Wattsinto4W
Frequencyresponse0-500,000Hz (-3dB)
Damping factor typ. 1000 at 100Hz, (8W)
typ. 600 at 10kHz (8W)
Distortionspectrumk2typ. -100dB, k3typ. -120dB, at 25W/4W
Noise> 112dB (A) at 10Veff
Channel separation> 90dB for 1kHz
Inputimpedance 47kOhm, 150pF
VoltageGain31,3(=30dB)
Inputs1xDIRECTIN, dc-coupled
1xAC-COUPLEDIN, ac-coupledvia
1µFMKP-Capacitor, f0=3,4Hz
Outputs1xOUT, for routing toother amplifiers
Speaker output"WBT" teminals, goldplated
Headphonesout1x6.3mm, stereo, 32..600W(rear side)
Power supply220..240 Volts/50..60 Hz or
110..120 Volts/50..60 Hz asindicatedontherear
5W stand-by, 700W max.
Dimensionsw430mm, h110mm, d360mm
Weight15kg
FinishSteel Chassis:black, 2mm
Front: 10mm aluminum, natural or blackelox
Top:brushedaluminum, black
Engineered and produced by:
Idektron GmbH&Co. KG, HernerStr. 299, Gebäude 6, 44809 Bochum
www.audionet.de
[e-mail]