Audionet AMP IV User manual

audionet
amP Iv
4ChannelAmplifier
Owner'sManual

2
Congratulations!
Forthoseinneedofevenmore amplification wehaveengineeredthe
AMPIV.TheAMPIVisourpower amplifier formultichannelapplica-
tions and supplementsourmono and stereoamplifiers. Withitsfour
channelsmodern6.1 homecinemaiseasilyattainableaswell asother
multichannelapplications like,forexample,bi-amping.Withanintelli-
gentcircuit layoutand highpower output,theAMPIVplayssovereign
and slender.Thesound qualityisoutstanding.TheAMPIVdoesnotget
workedup and playshighlyemotionally.Likeall ourmono and stereo
power amplifierswehaverealizedAudionet'sultra-linear amplifier con-
ceptconsequentlywithintheAMPIV.Itscircuitsare designedforthe
lowestdistortion and highestspeedand stability.Theconstruction makes
thefourchannelsoperateindependentlyasmuchaspossible.Aclever
protection circuit ensurestheeasiesthandling,highoperation safety,and
detectsthecorrectmains phase.Theinputsare equippedwithgold-
plated, Teflon-insulatedsockets, and theoutputswithgold-platedloud-
speaker terminals. Of course,AMPIVcanbeswitchedon and off re-
motely.TheAMPIVfascinateswithtransparency,richdetailsand the
greatestofease. Letyourselfbemore than inspired byits enthusiasm.
First,pleasereadthemanualand theprecautions carefully.TheAMPIV
isacomplexunit and offerslotsofcommon features. Incaseofdifficul-
ties, pleasedo nothesitateto contactyourdealer orourfactorydirectly!

3
Installation and powersupply
Pleasefind aplace foryourAudionetAMPIVthatissufficientlyventi-
lated to allowtheheatto dissipate.
Connectthepower jackattherear toyourwall outlet.You shouldeither
usetheprovidedpower cordoranother oneaccordingtoelectricalspeci-
fications ofyourhomecountry.Tuningwith"audiophile"power cords
can lead to improved sound field. Ask yourdealer forassistance.
NOTE:Thepower specificationsontherearmustmeet theelectrical
specificationsofyourhomecountry. TheAMPIVisaClass I-system
and mustbeearthed. Pleaseensure a stableearthconnection.
YourAudionetAMPIVisabletodetectawrongpolarization ofthe
mains. Ifyou see thefrontLEDflashingquicklywhenpoweringon, flip
theplugin 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.
Thecorrectpolarization ofthemains isimportantforreasons ofclarity
and stabilityofsound.
WARNING: AMPIVswitcheson automatically(AutoPower On)when
usingthemains switch attherear panel(see section "Operating").
Placing
Connecting
Mainsphase detection
AutoPowerOn

4
Inputs and Outputs
Foraddingorremovingconnections yourAMPIVmustbeswitched off!
Pleasemakesure thatall cablesare inabsolute bestcondition.Bro-
kenshieldsorshort-cutloudspeaker cablescoulddamageloud-
speakers ortheamplifier!
AtfirstconnectyourAMPIVtoyourpre amplifier.Theinputsare sub-
dividedintothegroups "RightGroup"and "LeftGroup".Withinbothgroups
are two inputjacks each ("IN1R"&"IN2R"and "IN1L"&"IN2L").
Ifyou wanttousetheAMPIVasa4channelpower amplifier flipboth
switches "Input Source"into position "Right Multi"and "Left Multi".
Incaseyou wanttousetheAMPIVasabi-ampingpower amplifier in
stereomodefliptheswitches"InputSource"intoposition "IN1R"and
"IN1L".Connecttheoutputsofyourpre amplifier toinputs"IN1R"and
"IN 1L".
Bothmodesare selectableseparatelytobothinputgroups. Forexample,
you canuse"GroupRight"withitsinputsforbothsurround channels"Left
Surround"and "RightSurround"(switchposition "RightMulti").Theleft
group canbeusedtosetup aCenter speaker inbi-ampingmode(switch
position "bi-ampIN1L").
ConnectyourspeakerstothegoldplatedWBTterminalsattheback.
Pleasemakesure thatthered outputs (+) oftheamplifier are connected to
thepositiveinputsoftheloudspeakers(usuallyred)and thewhiteoutputs
(-) are connectedtothenegativeloudspeaker inputs(usuallywhiteor
black).
Wrongspeaker polarization will result in severe loss ofsound quality!
Thenominalloudspeaker impedance should be4 ohms orhigher.
AlthoughtheAMPIVhasaprotection circuit topreventdamageofthe
system, switch off theunit whileworkingon theloudspeaker cables.
Inputs
Speakers

5
Never useforce ortools tighteningtheterminalscrews!
Inthefollowingyou will find theassignmentofinputjacks tocorre-
spondingloudspeaker outputsdependingon position ofswitch"Input
Source":
"Input Source"in position "Right Multi":
Input"IN 1R"-> Speakers output"OUT 1R"
Input"IN 2R"-> Speakers output"OUT 2R"
"Input Source"in position "Left Multi":
Input"IN 1L"-> Speakers output"OUT 1L"
Input"IN 2L"-> Speakers output"OUT 2L"
"Input Source"in position "bi-ampIN 1R":
Input"IN 1R"-> Speakers output"OUT 1R"&"OUT 2R"
Input"IN 2R"-> notused
"Input Source"in position "bi-ampIN 1L":
Input"IN 1L"-> Speakers output"OUT 1L"&"OUT 2L"
Input"IN 2L"-> notused
Assignmentofspeakers

6
Operating
First,switchon theAMPIVbyflippingthemains switchattherear in
position "1".Theswitchislocatedabovethemains socket.Nowthe
AMPIVwill startautomaticallyinrun mode(AutoPower On).To enter
thestand-bymodepress thebutton atthefrontpanel.
ForswitchingyourAMPIVon and off,pleaseusethepower button at
thefrontpanelfromnowon. Themains switchdoesnotneedtobeoper-
atedunless you are absentforalongtime.Itmustonlybeoperatedwhile
theAMPIVis in stand bymode
Asmentionedabove,yourAudionetAMPIVisabletodetectawrong
polarization ofthemains. Theindication isdonebythefrontLEDbe-
tweenthetouchofthe"power"keyand the"click"oftheloudspeaker re-
lays.
Ifthepolarization iscorrect,theLEDflashesÄ_____Ä_____Äetc.
However,ifyou shouldobserveafastsignalÄ_Ä_Ä_Ä_Ä_Äetc., flip
theplugin yourwall outletafter havingswitched off theAMPIV.
WhentheAMPIVisinstand-bymodeit canbepoweredup byany
Audionetpre amplifier (e.g.MAP,PRE, PRE1, PREG2, PRE1G2)
usingthe"Audionetlink".Thisfeature isdescribedinthepre amplifier
manuals, too.
You onlyneedasimpleoptical"Toslink"cable.Connectoneofthepre-
amplifier outputs"AudionetLink"withthe"Link"inputofyourAMPIV
"IN").NowtheAMPIVisswitchedon and off bythepre amplifier.
Lengthofthe"Toslink"cableisnotcritical-so you canplace theAMP
IVnextto thespeakers ifyou prefer.
Connectthe"AudionetLink"inputoffurther Audionetpower amplifiersto
the"link"output("OUT")ofAMPIVusingasimple,optical"Toslink"
cable.
Power
Mainsphase indicator
AudionetLink

7
Protection system
YourAudionetAMPIVisequippedwithoneofthemostpowerfulpro-
tection circuits availableon themarket.
In caseofan errorpleasecheck thecausereferringto thefollowingtable:
¨Overload:Short-circuit ofaloudspeaker cableorloudspeaker defect.
¨Overtemperature:Pleasefree thetop and bottomventilation slots!
¨HFError:HFoscillation, pleasecheck yourinputsource.
¨DCError:Dangerous DC-voltageattheoutput: Defectivepreamp,
source oractivecrossover carryingDC.
Apossiblefault isindicatedforall fourpower amplifiersseparately.In
caseofanerrortheLEDatthefrontpanelwill flash. Look throughthe
gaps inthetop plate.Attherear end ofthemainPCByou will find 12
LEDs. Whilerunnininerrorfree operatingmodeall 12 LEDswill beon.
IfanerroroccuredonlyoneoftheLEDswill beon indicatingtheerror.
There isanumber printednexttoeachLED.Pleaselook up thecorre-
spondingerrordescription in thefollowingtable:
1. DCon channel1L
2. DCon channel2L
3. DCon channel1R
4. DCon channel2R
5. Overload on channel1L
6. Overload on channel2L
7. Overload on channel1R
8. Overload on channel2R
9. Overtemperature on heatsink L
10. Overtemperature on heatsink R
11. High frequencyin group L
12. High frequencyin group R
WARNING: Removecauseforerrorbefore switchingon AMPIV
again!

8
Specialities
ForoptimizingthehighfrequencycapabilitiesAudionetconsequently
usesSurface-MountedDevices(SMD).Asaresult thefaster and more
compactcircuitsenabletheengineer touselow-straw and extremeshort
wiring. Theverygood dampingfactoris aresult ofthis, forinstance.
Pre and power stageshaveseparaterectifierscircuits. Themaintrans-
formersare ratedat2*400VA and drivesixteenhighcurrentcapacitors
withanoverall capacityof120.000mF.All 16 rectifyingdiodesare ultra-
fast"schottky"-types.
Inputand driver stages haveseparatefastand discretevoltageregulators.
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
Circuitry

9
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.Unauthorized
openingwill causetheloss ofwaranty.
¨Do notshort-circuit theoutputterminals.
¨Pleaseuseadrycloth forcleaning
Wewish you manyexcitinglisteningexperienceswithyourAudionet
products!
Ifyou needfurther information aboutourproductspleasedo nothesitate
to contactyou localAudionetdealer orus directly!
YourAudionetTeam

10
Technical Data
Function4-channel power amplifier
Outputpower4*100 Wattsinto8ohms
4*160 Wattsinto4ohms
Frequencyrange2-300.000 Hz (-3dB)
Damping factor > 1000 from10 Hz to10 kHz
THD + N> 104 dB (25 Watts/4ohms)
Harmonic distortionk2typ. -115 dB for 25 Wattsinto4ohms
k3typ. -120 dB for 25 Wattsinto4ohms
Signal tonoiseratio> 110 dB
Channel separation> 90 dB at 1kHz
Inputimpedance 37 kohms, 150 pF
Inputs4RCAlineAC-coupled, gold-plated
1Audionet-Link, optical
Outputs4stereoloudspeaker terminals, gold-plated
1Audionet-Link, optical
Mains120 Vor 230 V, 50...60 Hz
2WStandby, max. 800 W
Dimensions430 mm *110 mm *360 mm (W*H*D)
Weight18 kg
FeaturesProtectioncircuit for HF, DC, temperatureandoverload
remote switch-onvia Audionet-Link (optical)
automatic mainsphaserecognition
autostartfunction
Engineered and produced by:
Idektron GmbH&Co. KG, HernerStr. 299, Gebäude 6, 44809 Bochum
www.audionet.de
[e-mail]