DaytonAudio APA1200DSP User manual

1200W POWER
AMPLIFIER with
INTEGRATED DSP
Model: APA1200DSP User Manual

2
WARNING! TO REDUCE THE RISK OF FIRE OR ELECTRIC SHOCK, DO NOT EXPOSE THIS APPLIANCE TO RAIN OR MOISTURE.
CAUTION! TO REDUCE THE RISK OF SHOCK, DO NOT REMOVE THE COVER, NO USER SERVICABLE PARTS INSIDE. REFER
SERVICE TO A DAYTON AUDIO AUTHORIZED DEALER.
IMPORTANT SAFETY INSTRUCTIONS
 • Readandkeeptheseinstrucons.
 • Heedallwarningsandfollowallinstruconscontainedwithinthismanual.
 • Donotusethisunitnearwater.
 • Cleanonlywithdrycloth.
 • Donotblockanyvenlaonopenings.Installinaccordancewiththemanufacturer’sinstrucons.
 • Donotinstallnearanyheatsourcessuchasradiators,heatregisters,stoves,orotherapparatus(including
  ampliers)thatproduceheat.
• Donotdefeatthesafetypurposeofthepolarizedorgrounding-typeplug.Apolarizedplughastwobladeswith
  onewiderthantheother.Agroundingtypeplughastwobladesandathirdgroundingprong.Thewidebladeor
  thethirdprongareprovidedforyoursafety.Iftheprovidedplugdoesnottintoyouroutlet,consultan
  electricianforreplacementoftheobsoleteoutlet.
 • Protectthepowercordfrombeingwalkedonorpinchedparcularlyatplugs,conveniencereceptacles,andthe
  pointwheretheyexitfromtheunit.
 • Onlyuseaachments/accessoriesspeciedbythemanufacturer.
 • Unplugthisunitduringlightningstormsorwhenunusedforlongperiodsofme.
 • Referallservicingtoqualiedservicepersonnel.Servicingisrequiredwhentheunithasbeendamagedinany
  way,suchaswhenthepower-supplycordorplugisdamaged,liquidhasbeenspilled,orobjectshavefalleninto
  theunit,theunithasbeenexposedtorainormoisture,doesnotoperatenormally,orhasbeendropped.
 • Operatetheunitonlywiththevoltagespeciedontherear.Fireand/orelectricshockmayresultifahigher
  voltageisused.
 • Donotmodify,kink,orcutthepowercord.Donotplacethepowercordincloseproximitytoheatersanddonot
  placeheavyobjectsonthepowercordand/ortheunititself,doingsomayresultinreorelectricalshock.
 • Donottouchthespeakerterminalsaselectricshockmayresult.
 • Ensurethatthesafetygroundterminalisconnectedtoaproperground.Neverconnectthegroundtoagaspipe,
  asasevereexplosionand/orremayresult.
 • Besuretheinstallaonofthisproductisstable,avoidunlevelsurfacesastheproductmayfallandcauseinjury,
  propertydamage,electrocuonand/orre.
 • Notethatwhentheunitisturnedo,itisnotcompletelydisconnectedfromtheACpoweroutlet.Donotopen
  thecover.
REFER ALL SERVICE TO A QUALIFIED SERVICE TECHNICIAN
Safety

3
ATTENTION!POURRÉDUIRELERISQUED'INCENDIEOUDECHOCÉLECTRIQUE,N'EXPO-SEZPASCETAPPAREILÀLAPLUIE
OUÀL'HUMIDITÉ.
ATTENTION! POUR RÉDUIRE LE RISQUE DE CHOC ÉLECTRIQUE, NE RETIREZ PAS LE COUVERCLE, AUCUNE PIÈCE RÉPARA-
BLEPARL'UTILISATEURNESETROUVEÀL'IN-TÉRIEUR.ADRESSEZ-VOUSÀUNREVENDEURAGRÉÉDAYTONAUDIO.
CONSIGNESDESÉCURITÉIMPORTANTES
 • Lisezetconservezcesinstrucons.
 • Tenezcomptedetouslesaverssementsetsuiveztouteslesinstruconscontenuesdanscemanuel.
 • N'ulisezpascetappareilàproximitédel'eau.
 • Neoyez-leuniquementavecunchionsec.
 • N'obstruezpaslesouverturesdevenlaon.Installezl'appareilconformémentauxinstruconsdufabricant.
 • Nel'installezpasàproximitédesourcesdechaleurtellesqueradiateurs,bouchesdechaleur,poêlesouautres
  appareils(ycomprislesamplicateurs)quiproduisentdelachaleur.
 • Nepascontrecarrerl'objecfdesécuritédelachepolariséeoudelachedeterre.Unechepolariséepossède
  deuxlamesdontl'uneestpluslargequel'autre.Uneprisedeterreadeuxlamesetunetroisièmebrochedemise
  àlaterre.Lalamelargeoulatroisièmebrochesontprévuespourvotresécu-rité.Silachefournienes'adapte
  pasàvotreprisedecourant,consultezunélectricienpourremplacerlapriseobsolète.
 • Protégezlecordond'alimentaonpouréviterqu'onmarchedessusouqu'ilsoitpincé,enparculierauniveaudes
  ches,desprisesdecourantetdupointdesoredel'appareil.
 • N'ulisezquelesaccessoiresspéciésparlefabricant.
 • Débranchezcetappareilpendantlesoragesoulorsqu'iln'estpasulisépendantdelonguespériodes.
 • Coneztouteslesopéraonsd'entreenàunpersonnelqualié.L'entreenestnécessairelorsquel'appareilaété
  endommagédequelquemanièrequecesoit,parexemplelorsquelecordond'alimenta-onoulacheesten
  dommagé,qu'unliquideaétérenverséouquedesobjetssonttombésdansl'appar-eil,quel'appareilaétéexposé
  àlapluieouàl'humidité,qu'ilnefonconnepasnormalementouqu'ilesttombé.
 • Nefaitesfonconnerl'appareilqu'aveclatensionindiquéeàl'arrière.L'ulisaond'unetensionplusélevéepeut
  entraînerunincendieet/ouunchocélectrique.
 • Nemodiezpas,nepliezpasetnecoupezpaslecordond'alimentaon.Neplacezpaslecordond'alimentaonà
  proximitédesappareilsdechauageetneposezpasd'objetslourdssurlecordond'alimentaonet/ousur
  l'appareillui-même,carcelapourraitprovoquerunincendieouuneélectrocuon.
 • Netouchezpaslesbornesdeshaut-parleurs,carvousrisqueriezderecevoirunchocélectrique.
 • Assurez-vousquelabornedeterredesécuritéestconnectéeàuneterreappropriée.Neconnectezjamaislaterre
  àuneconduitedegaz,carcelapourraitprovoqueruneexplosionet/ouunincendie.
 • Assurez-vousquel'installaondeceproduiteststable,évitezlessurfacesnonplanescarleproduitpeuttomberet
  causerdesblessures,desdommagesmatériels,uneélectrocuonet/ouunincendie.
 • Notezquelorsquel'appareilestéteint,iln'estpascomplètementdéconnectédelaprised'alimentaonCA.
  N'ouvrezpaslecouvercle.
CONFIERTOUTEINTERVENTIONÀUNTECHNICIENDESERVICEQUALIFIÉ
Sécurité
RISQUE DE CHOC ELECTRIQUE
NE PAS OUVRIR

4
Thank you for purchasing the Dayton Audio® APA1200DSP 1200 Wa Power Amplier with integrated DSP!
What is Included:
APA1200DSP
PowerCable
User Manual
AutoEQMicrophone
Features
• Networkingcapabilityforconvenientcontrolviaanydevicewithawebbrowser
• AutomatedRoomEQcorreconalgorithmforconnectedsubwoofers
• On-boardcontrolpanelwithLCDdisplayandstatusLEDs
• PowerfulDSPfeaturescongurablewithaweb-basedGUIorrightontheunititself
 • LowPassFilter(LPF)
 • HighPassFilter(HPF),usableasasubsoniclter
 • ParametricEQ(PEQ),upto8bandsperchannel
 • PhaseControl
 • LineOutputHighPassandDelayformainsintegraonwithaconnectedsubwoofer
 • Limiter
• EcientClassDoutputtopology
• Balancedandunbalancedlinelevelinputsandoutputs
• Digital COAX input
• LineOutputwithhighpasslteranddelayforconnecngexternalampliers
Table of Contents
Front Panel Diagram..................................................................................................................................................... 5
Rear Panel Diagram ...................................................................................................................................................... 6
Navigang and Adjusng Parameters with the Onboard GUI ........................................................................................ 7
Onboard GUI Menu Screens ......................................................................................................................................... 8
Network Connecon and Accessing the Web Based GUI ............................................................................................. 10
Web GUI Overview ..................................................................................................................................................... 11
Volume / Phase / Input ............................................................................................................................. 12
LPF Menu (Low Pass Filter) ........................................................................................................................ 13
HPF Menu (High Pass Filter)....................................................................................................................... 14
PEQ Menu (Parametric Equalizer) .............................................................................................................. 15
PEQ Filters Conguraon........................................................................................................... 16
Limiter Menu ............................................................................................................................................ 17
Line Out Sengs ....................................................................................................................................... 18
Presets ...................................................................................................................................................... 19
Auto EQ Funcon ...................................................................................................................................... 20
Auto EQ Menu .......................................................................................................................... 21
Auto EQ Troubleshoong .......................................................................................................... 22
Power Saving Page .................................................................................................................................... 23
Load Selecon........................................................................................................................................... 24
Network Conguraon Page...................................................................................................................... 25
About Page................................................................................................................................................ 25
Specicaons ............................................................................................................................................................. 26
Troubleshoong ......................................................................................................................................................... 27

5
Front Panel
A. LEDs
1. Limiter LED:Lightsredwhenevertheamplierreachesthecongurablevoltagelimit.
  Limiterwillalsobeacvated(lightsup)duringthefollowingcondions:
    I.Overload
    II.Overtemperature
    III.Speakershortcircuit
2. On LED:Lightsgreenwhenthedeviceisturnedonandoperangnormally.
3. Standby LED:Lightsredwhentheamplierentersstandbymode.
B. LCD Display: Displaysstatusinformaonandmenustoallowcompletecontrolofthedevicewiththe
controlknob.
AllparametersfoundinthesemenuscanalsobeadjustedwiththewebGUIaermakinganetwork
connecon.
C. Adjustment/Set Control Knob:
Rotangtheknobmovesthroughthedevice’smenuoradjuststhecurrentlyselectedparameterup
ordown.
1. Pressingthedialonceselectsagivenparameteroradvancesfurtherintothemenu(goforward).
2. Quicklypressingthedialtwicereturnstothepreviouspageorpreviouslevelofthemenu(gobackward).
3. Longpressingthecontrolknobcanbringupextrafuncons,dependingonthemenu.Forexample,
longpressinginsomemenuswillallowyoutolinkorunlinkchannels.

6
Rear Panel
A. Mic In:MicrophoneinputforautoroomEQcalibraon(Note:Usethemicrophonethatcamewiththedevice.The
sowareiscalibratedfortheincludedmic,andresultsWILL VARYifadierentmicisused.)
B. LAN: ConnectyourAPA1200DSPtoanetwork(viaarouterornetworkswitch)withastandardethernetpatch
cabletoenableremotecontrolofalldevicesengsviaanywebbrowserofadeviceonthesamenetwork.
C. DC12V Trigger:12VDCinputtoturnon/otheAPA1200DSPwithanexternalcontroldevice.
D. Power On Seng: Thereare3possiblemodesforthisseng.
1. ON:Thedevicewillremainonatallmesaslongastheunitisconnectedtopowerandthepowerswitchon
therearofthedeviceisswitchedon.
2. Auto: Iftheamplierdoesnotdetectananaloginputsignalgreaterthanthethresholdselectedinthepower
savingmenu,itwillautomacallyenterstandby.IfyouwanttowakeupinAutomode,youcaninputamusic
signalovertheselectedthresholdorselecttheONmode.NOTE:Thismodeshouldnotbeusedifthedigital
coaxconneconisused,asthedigitalcoaxconneconcannottriggerthedeviceoutofstandby.
3. 12V Trigger:WillconrmthatthereisnoaudiosignalandDC12Vbeforeenteringstandby.Ifyouwantto
wakeupunder12VTrigger,youcaninputDC12VorselectON.
E. Digital Input:CoaxDigitalAudioInput.(SPDIF)
F. Input:AnalogRCAx2orXLRx2.
G. Input Aenuaon Switch:Adjustbetween-10dbV(900mVmaxinputbeforeclipping)
and-4dBV(1.8Vrmsbeforeclipping)
H. Preamplier Output:AnalogRCAx2orXLRx2.
I. Speaker Output:Bindingpostx4.
2OhmMinimumforStereoConguraon
4OhmMinimumforBridgedConguraon
J. Power Switch:TurnOn/Otheamplier.
K. Power:Connecttheincludedpowercord(IEC60320-C13)
CAUTION
RIS K OF ELEC TRONI C SHOCK
DO NO T OPEN
AVIS :RISQ UE DE CHO C ELECT RIQUE N E PAS OU VRIR

7
Navigang and Adjusng Parameters with the Onboard GUI
ItispossibletoadjustmostparametersoftheAPA1200DSPontheunititselfviathedisplayandcontrolknob.Forinial
setupofthedevice,itisrecommendedtoconnecttotheweb-basedGUI(seethenextsecon),astheonboardGUIis
beerformakingquickadjustmentsonthey,ratherthanmanyadjustmentsatonce.Formoreinformaonabouteach
menuoponandparametertype,seethecorrespondingseconslaterinthisguide.
Instrucons:
1. Rotang the dialwillmovetothenextmenuoponorincrease/decreaseavaluedependingonthecurrent
contextofthemenu.Thecurrentlyselectedparameterwillbehighlighted.
2. Pressing the dialonceselectsagivenparameteroradvancesfurtherintothemenu(goforward).
3. Quickly pressing the dial twicereturnstothepreviouspageorpreviouslevelofthemenu(gobackward).
Forexample,ifyouareinthePEQmenu,youwillclicktheknoboncetoselectaparametersuchasfrequen-
cy.Youcanthenrotatethedialtochangethisfrequency.Whenyouaredone,pressthedialtwicetogoback,
allowingyoutoselectadierentparametertochange.
4. Long pressing the control knobinthemenusofvolume,LPF,PEQ,HPF,PhaseDegreeandlimiter willallow
youto‘link’theAandBchannelstogether,whichmeansthatallparameterswithinthemenuwillaectboth
channels.Longpressingagainwillallowyouto‘unlink’thechannelsandcreateindividualsengsforeach
channel.
i.
ii. Indicates linked channels
iii.   Indicatesunlinkedchannels(channelAisselected)

8
Onboard GUI Menu Screens
BelowiseachpossiblemenuscreenusingtheAPA1200DSP’sonboardmenusystem.Thelemostcolumnare‘main
menu’opons,andthefollowingcolumnsarefoundbypressingthedialwhilethemainmenuitemisselected.Quickly
pressthedialtwicetogoback.

9
Onboard GUI Menu Screens

10
Network Connecon and Accessing the Web Based GUI
Theweb-basedGUIwillallowcontrolofallfunconsoftheamplierthroughthewebbrowserofanydeviceonthe
samenetwork(cellphone,laptop,tablet,etc).
Steps:
1. ConnecttheAPA1200DSPtoarouterornetworkswitchviaastandardethernetpatchcable.Plugoneendofthe
patchcableintoyourrouter/switch,andplugtheotherendintotheLANportonthebackoftheAPA1200DSP
(TheAPA1200DSPcannotbeaachedtoyournetworkviaWi-Fi,howeverWi-Fidevices,suchasalaptop,can
wirelesslyaccesstheAPA120DSP’swebGUI).Note: TheAPA1200DSPwillworkwithoutanexternalinternetcon-
necon,meaningthenetworkneedstobeestablished,butitdoesnotrequireconnecontoaserviceprovider.
2. Oncethedeviceisconnectedtothenetworkviaethernet,thewebinterfacecanbereachedusinganydevice
withawebbrowseronthesamenetworkastheAPA1200DSP(laptop,cellphone,tablet,desktop,etc).Enter
hp://APA1200DSP/intotheaddressbarofyourbrowsertoconnecttothebrowserGUI.Note: Ifmulple
APA1200DSPunitsareonyournetwork,thislinkcannotbeused,andyoumustfollowthenextsteptondthe
uniqueIPaddressofeachdevice.
3. ThebrowserGUIcanalsobeaccessedbydirectlyenteringtheIPaddressofyourAPA1200DSPintoyourweb
browser.ThisIPaddresscanbefoundbyenteringthedeviceinfoscreenusingthebuilt-indisplayashighlighted
below.EntertheIPaddressintotheaddressbarofyourwebbrowser.
Network Troubleshoong
A. If using the link hp://APA1200DSP/andyoucannotmakeaconnecon,tryfollowingstep3abovetondtheIP
addressofyourdevice,andconnecttoyourdevicebyenteringtheIPaddressintoyourwebbrowser.
B. MakesurethatyouareusingadevicethatisonthesamenetworkasyourAPA1200DSPtoaccesstheinter-
face.ThedeviceyouareusingforaccesscanbeconnectedeitherthroughWi-Fi,likealaptop,ordirectlytothe
networkwithapatchcablelikeyoumightdoonadesktopPC.Insomesituaons,especiallyinbusinesses,there
mightbemulpleWi-Finetworksinthebuilding,andtheoneyouareconnecngtomightnotbethesameactu-
alnetworkastheethernetportyoupluggedyourAPA1200DSPto.
C. Tryadierentethernetpatchcable.MakesureyourAPA1200DSPispoweredon.
D. Tryresengyourrouter.
E. IfyourbrowserisconnecngtothewebGUIbutyouareexperiencingadelayortheinterfaceisveryslow,see
thefollowingsteps.
1. DisconnectanyotherwebbrowserfromtheAPA1200DSP’swebinterface.Onlyconnectonebrowser
atametoyourAPA1200DSPforopmalperformance.
2. Ifusingawirelessdevice(likealaptoporcellphone)toaccesstheGUIaccesstheAPA1200DSP’s
interface,makesurethattheconneconisstableandstrong.
3. Tryrestarngthedevice.Tryusingthe“globalreset”oponinthepresetsmenu(ifyouhavepresets
youwanttosave,savethepresettoyourPC,becausepresetsstoredontheAPA1200DSPwillbe
resetaerpressing“globalreset”

11
Web GUI Overview
TheseGUIelementswillalwaysbepresentwhileusingtheAPA1200DSP’swebinterface.Enterdierentmenus
byclickingmenuitemsonthelesideofyourscreen.
A. Menu – DisplaysallmenuoponsavailableontheAPA1200DSP.Clickonthetextofeachmenuitemto
enterthatmenu.The“Home”seconofthemenucanbecontractedorexpandedbyclickingonit.
B. Level Meter - DisplaysinputandoutputlevelsindB.Ifyouarenotgenganyoutputfromyourconnect-
edspeaker,butyouseethatthereisoutputfromthelevelmeter,checktheconneconfromtheampto
yourspeaker.
1. The“M”buonsnexttotheoutputlabelcanbeusedtomutetheoutputofyourAPA1200DSP.
C. Output Mode – Setyourdevicetoeither“Sub”or“Stereo”mode.
1. Sub – ThismodeshouldbeusedwhenasubwooferisaachedtotheAPA1200DSPinbridged
mode.ThismodeallowstheAutoEQfuncontobeused.
2. Stereo -Thismodeshouldbeusedforstereoconguraons,oranymeaspeakerisnotconnected
totheAPA1200DSPinbridgedmode.AutoEQmodeisdisabledinthismode.
D. System Informaon – Displaysusefulinformaonsuchasthesystemupme,currentpreset,andIPad-
dressoftheAPA1200DSP.

12
Volume / Phase / Input
A. Input Source – SwitchtheinputsourcebetweenanalogandSPDIFinput.
B. Channel Mode-Changewhichchannelthesengsaretobeapplied.Linkmodewillapplythesameset-
ngstobothchannel,butyoucanalsosetindividualsengsforeachchanneliftheAPA1200DSPisused
instereomode.
C. Volume – Dragtheslidertoincreaseordecreasetheamplier’soutputvolume.Thearrowbuonscan
alsobepressedforgranularvolumecontrol.Therangeis-99dBto0dB.
D. Phase – Dragtheslidertoincreaseordecreasetheamplier’sphase.Thearrowbuonscanalsobe
pressedforgranularcontrol(incrementordecrementby5°).Therangeoftheslideris0° to 180°.

13
LPF Menu (Low Pass Filter)
LPFstandsfor“LowPassFilter”.Thisisthetypeoflterthatisusedtopreventasubwooferfromplayinghigh
frequencies,butthisisnottheonlyuseoftheLPF.Forexample,ifIsetalowpasslterat100Hz,frequencies
lowerthan100Hzwill“pass”,butfrequenciesgreaterthan100Hzwillbeaenuatedbyaspeciedslope.LPFsare
essenalforsubwoofers,becauseitallowsthesubwoofertoonlyplaythelowfrequenciesofyouraudiosource.
A. Graph – Showsagraphicalrepresentaonoftheappliedlowpasslter.
B. Channel Mode-Changewhichchannelthelteristobeappliedto.Linkmodewillapplythesamelter
toboth,butyoucanalsosetindividualltersforeachchannel(AandorB)iftheAPA1200DSPisusedin
stereomode.
C. Enable / Disable the LPF
D. Filter Sengs
1. Slope–Opons:6dB,12dB,24dB,36dB
2. Frequency-Range:20Hz–20,000Hz

14
HPF Menu (High Pass Filter)
Subsonic Filter
HPFstandsfor“HighPassFilter”.Thistypeoflterwillcutlowfrequenciesoutofanaudiosignal,allowingfrequencies
higherthantheselectedfrequencyto‘pass’.Thisltercanalsobeusedasa“SubsonicFilter”.Thistypeoflterisahigh
passltersettolteroutverylowfrequencies,anditeasestheloadonaspeakersystembycungoutfrequencies
fromthesignalthatthesystemcannotplay/cannotplaywell.Thiscanhavenumerousadvantagesinpowerhandlingand
evenclarityofaudio,dependingonthesystem.
A. Graph – Showsagraphicalrepresentaonoftheappliedhighpasslter.
B. Channel Mode-Changewhichchannelthelteristobeappliedto.Linkmodewillapplythesamelter
toboth,butyoucanalsosetindividualltersforeachchannel(AandorB)iftheAPA1200DSPisusedin
stereomode.
C. Enable / Disable the LPF
D. Filter Sengs
1. Slope–Opons:6dB,12dB,24dB,36dB
2. Frequency-Range:16Hz–20,000Hz

15
PEQ Menu (Parametric Equalizer)
TheparametricEQ(PEQ)menuallowsforupto8bandsofcustomequalizaon,andalsoallowscustomizaonoftheEQ
generatedfromthe“AUTOEQ”funconoftheAPA1200DSP.Allltersareimplementedasinniteimpulseresponseor
IIRlters,whichisstandardformostPEQinterfaces.
A. EQ Control Buons
1. Disable All EQ – TurnsOFFallEQbands.Doesnotresetvalues.Usefulfordoingbeforeandaer
comparisonswithEQ.
2. Enable All EQ – TurnsONallEQbands.Doesnotchangevalues.Usefulfordoingbeforeandaer
comparisonswithEQ.
3. Reset All EQ – ResetsallEQvaluestodefault(at).Doesnotchangeenabled/disabledstatus.There
willbeaslightdelay.
B. Graph-ThegraphwillshowtheeectsofallenabledEQbands.EachenabledEQbandwillhaveitsown
correspondingpurpleandyellowdotsonthegraphforeasycontrol.
1. Purple Dot–DragthedottochangethefrequencyandgainvaluesofeachenabledEQband
2. Yellow Dot–DragtheyellowdottochangetheQvalueofeachenabledEQband.Movingthe
yellowdotawayfromthecorrespondingpurpledotwillreducetheQvalue,andmovingtheyellow
dottowardsthepurpledotwillincreasetheQvalue.(LargerQvalueswillaectasmallerrangeof
frequencies,smallerQvalueswillaectalargerrangeoffrequencies)
C. Channel Mode-Changewhichchannelthelteristobeappliedto.Linkmodewillapplythesamelter
toboth,butyoucanalsosetindividualltersforeachchannel(AandorB)iftheAPA1200DSPisusedin
stereomode.
D. See next page
E. See next page

16
PEQ Filters Conguraon
The5BandPEQwillbeautomacallysetupbytheAUTOEQmodeofthisamplier,butvaluescanbe
changedatanyme.The3BandPEQwillnotbeaectedbyAUTOEQ.Clickanynumberinthismenu
totypeaspecicvalue.
1. Freq–SetsthefrequencyofeachEQband
i. Range:20Hzto20,000Hz
ii. ControllablebydraggingthepurpledotofeachEQbandhorizontally.
2. Gain–SetsthegainofeachEQband.
i. Range:-12dBto+6dB
ii. ControllablebydraggingthepurpledotofeachEQbandvercally.
3. Q –SetstheQvalueofeachEQband.ThiswillaecttherangeoffrequenciestheEQbandwillaect.
i. Range:0.4to14
ii. Lowervalueswillaectalargerrangeoffrequencies.Highervalueswillaectanarrow-
errangeoffrequencies.
iii. ControllablebydraggingtheyellowdothorizontallyforeachcorrespondingEQband
4. Type –TypeislockedtoPEAKforthe3bandPEQ.The5-BandPEQhas5oponsforltertype
1. Peak 4. Notch
2. TrebleShelf 5. LPF
3. Bass Shelf 6. HPF
5. Enable –TheboxattheboomofeachbandenablesordisableseachEQband.Itwillgloworange
whenenabled,orgreywhenitisdisabled

17
Limiter Menu
Thelimiterisatoolthatwillallowinputsignalsbelowthegiventhresholdtopassthroughtheamplierun-
aectedbutwillaenuatesignalsiftheyarehigherthanthethreshold.Thelimiteronlyrespondstoactual
clipping,andautomacallycompensatesforloadandvoltagevariaons.Thistoolcanbeparcularlyusefulfor
protecngdrivers.ThelimiterLEDonthefrontofthedevicewillilluminatewhenlimingisacvelyoccurring.
A. Channel Mode-Changewhichchannelthelimiteristobeapplied.Linkmodewillapplythesameliming
toboth,butyoucanalsosetindividuallimitforeachchannel(AandorB)iftheAPA1200DSPisusedin
stereomode.
B. Threshold – Setthethresholdofthelimiter.Signalsbelowthisthresholdwillpassthroughunaected,but
signalsabovethisthresholdwillbelimited.0dBeecvelymeansthelimiterisOFF.
1. Range: -99dBto0dB
C. Aack – Determineshowquicklylimingisappliedtotheinputsignal.Alowervaluemeansafaster at-
tack,andthelimiterreactsquicklytoasignalthathaspeakedabovethethresholdvalue.
1. Range: 1msto100ms
D. Release – Determineshowquicklythelimiterstopsaecngthesignal.Thelowerthevalue,thequicker
thelimiterwillstopreacngtoasignalthatpeakedabovetheselectedthreshold.
1. Range:90msto3000ms

18
Line Out Sengs
Thispageallowsyoutoadjustvarioussengsthataectthelineoutputpassthroughopononthe
APA1200DSP.ThismenuisparcularlyusefulifyouareusingtheAPA1200DSPasasubwooferamplierand
wouldliketohighpassyourmainspeakerstopreventinteraconbetweenthebassfromyourmainsandthe
bassfromyoursubwoofer.DoingthiswillalsoensureamoreaccuratesimulatedresultwhenusingtheAUTO
EQfunconofthisdevice.
A. Graph–Showsagraphicalrepresentaonofthelineoutput.Ifyouhaveenabledthehighpasslter(HPF),
youwillseeitrepresentedinthisgraph.
B. HPF Enable – Turnsthehighpasslterforthelineoutonoro.
C. HPF Slope – Changestheslopeofthehighpasslter.
1. Opons: 6dB, 12dB, 24dB, 36dB
D. Delay – Addsanoponaldelaytoyourlineoutput.Thiscanbeusefulformealigningyoursubwoofer
andmains.
1. Range:0msto10ms
E. Frequency –Range:31Hz–125Hz

19
Preset Menu
Presetsareparcularlyusefulforquicklychangingmanysengsontheyfordierentusecases,orwhile
prototypingEQandltersengs.Presetscaneitherbesavedtotheamplieritself,ortothecomputerthat
thewebGUIisrunningon.Thismenualsoletsyouresettodefaultvalues.Notethatpresetswillnotaector
savethesengsofinputtype(analogorcoax),powersavingsengs,orloadselecon.
A. To Amp Preset Opons – ThesepresetswillbestoredontheAPA1200DSPunititself.Theunitcanstoreupto20
uniquepresetswithcustomizablenames.
1. DropdownMenu–Selectyourdesiredpresetorpresetslotfromthisdropdownmenu.Ifloadingor
savingapreset,thisseleconwillbetheslotsavedtoorloadedfrom.
2. EditNameField–Enteryourdesirednameforthepresethere.Thisisthenamethatwillbesaved
when“SavePre-Set”isselected.
3. SavePre-SetBuon–Thisbuonwillsaveallcurrentsengsandparameterstoapresetthatcan
beloadedatanyme.Thepresetwillsaveintothecurrentlyselectedpresetslot(itwilloverwrite
thepresetstoredinthisslot).
4. LoadPre-SetBuon–Thisbuonwillloadallofthesengsandparametersthatwereoriginally
savedintoyourselectedpreset.Itwilloverwriteanyofyourcurrentsengs.
B. Reset–Thisbuonwillresetthecurrentlyselectedpreset.ItwillalsoresetallyouracveDSPsengs
(LPF,HPF,PEQ,Limiter,LineOutSengs).
C. To Computer Preset Opons–Thesepresetswillbedownloadedtowhicheverdeviceyouareusingto
connecttotheAPA1200DSP’swebinterface.Aerpressingsave,theGUIwillpromptyoutogiveyourle
anameandtochoosebetween.txtor.csvletypes(eitherisOK).
1. SaveBuon–ThisbuonwillsavethecurrentsengsontheAPA1200DSPintoalethatcanbe
storedonthecomputer.
2. LoadBuon–Thisbuonwillallowyoutoloadapresetfromyourcomputerthatwaspreviously
createdwiththesavebuonnexttoit.
D. Global Reset – Thisbuonwillresettheenredevicetofactorydefaults,removingallpresetsandother
sengs.Theinterfacewillrebootafewmomentsaerthisbuonispressed.

20
Auto EQ Funcon
TheAPA1200DSPoersapowerfullowfrequencyautoEQprocessforsubwoofersconnectedinSUB(bridged)
mode.Bytaking5measurementsthroughoutaroomoraroundalisteningposion,thesowarewillgainan
understandingofthecombinedresponseofthesubwooferwithinyourroom.Withthisunderstanding,the
devicewillgenerate5bandsofEQtotrytogenerateasignicantlyaerbassresponsethroughouttheroom
orlisteningposion.
Youwillbeaskedtoplacethemicrophonein5dierentlocaonsduringthisprocess.Thelocaonsyouchoose
areuptoyouandwhatyouaretryingtoachievewiththecorrecon.Ifyouwouldlikethebassresponsetobe
eventhroughouttheenreroom,choose5locaonsspreadacrosstheroomtogetanaverageresponsefor
theroom.Ifyouwouldlikethebassresponsetobeasbestasitcanbeinasinglelisteningposion,movethe
microphoneforeachmeasurement,butkeepitclosetothelisteningposion.(thiswillusuallyhavenegave
impactonthesubwoofer’ssoundintherestoftheroombutcanhavegreatresultsinasinglelisteningposi-
on).
FollowingtheautoEQprocess,5bandsofEQwillbeappliedtotheconnectedspeaker(thiscorrecondoes
NOTaectthelineoutfrequencyresponse).These5bandsofEQwillbemodiableviathe“PEQ”menuop-
on.Youwillseethe“5BandEQ”willmatchtheresultsofyourautoEQandallowyoutofurthermodifythe
correcontoyourliking.
Before you start
1. Setyourdesiredhighpassandlowpassltersforyoursubwoofer.Thesehighpassandlowpasslters
willaectyourmeasurements.Forexample,ifyouintendonusingasubsoniclter(HPF)foryoursub-
woofer,youcansetthatbeforetakingmeasurements,orchoosetodothemeasurementswithoutthe
HPFenabled.
2. NotethatallPEQwillbedisabledduringthemeasurementprocess,andanyvaluesinthe5BandPEQ
willbereset.
3. REDUCE YOUR OUTPUT VOLUME USING THE PROVIDED SLIDER.Eventhoughyoursubwoofermight
notbeoverloadedortooloudwhileplayingmusic,thetestsignalsusedformeasurementswilllikelybe
muchlouderthanyourinputsource.Toensuretheproteconofyoursubwoofer,reducethevolume
signicantlybeforetakingyourrstmeasurement.Youcanthenrestartthemeasurementprocesswith
ahighervolumeifthevolumewastoolow.
4. UseonlythemicrophoneprovidedintheboxwiththeAPA1200DSP.Whilealternavemicrophones
mightfunconwiththedevice,theautoEQprocesswascalibratedspecicallywiththestyleofmicro-
phonethatcamewithyourdevice,andresultswillvaryifusingalternavemic.