GMF Ai1 User manual

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Ai1OWNER’SMANUAL
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Thankyouandcongratulationsonyourchoiceofthisproduct.
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Features:
Thisisafull‐featured*AcousticPreamp/*DI/*HeadphoneAmp/*AcousticInterface.Whetheratalocalopen
micnightoratamajorconcertvenue,youwillbeabletodialintheclearnaturalacousticsoundandrouteit
tothestagePAthroughabalancedXLRoutput.YoucanalsousetheAi1topatchyouracousticinstrument
intoyourhometheatersystemtoplayyouracousticinstrumentwithoutanexpensiveamplifier,orjustplugin
apairofheadphonesforprivatelistening.
GettingStarted:
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Asaruleofthumbforallofourproducts,beginwithallofthecontrolsatthemidpoint(12:00o'clock)with
the"NOTCH"and"SHAPE"switches"OFF".ThisisamediumgainsettingwithFLATfrequencyresponse.
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The"INPUTGAIN"controlwillbethefirstcontrolthatyouwillwanttodialin.The"INPUTGAIN"isnota
volumecontrol,ratherthiscontrolsetsthelevelofamplificationappliedtotheinputsignaltoboostittoa
useablelevel.Thereasonthisisadjustableistoaccommodateawiderangeofpickupdevices.Forinstanceif
youareusingahighoutputactivepickupsystemyouwillwanttousealowersettingonthe"INPUTGAIN"
thansayifyouareusingapassivetypepickupsystem.Youwillwanttousethehighest"INPUTGAIN"setting
youcanwithoutoverdrivingordistortingthesignal.Toachievethis,whileplaying,slowlyturnthe"INPUT
GAIN"up(clockwise)untilyoubegintohearsomedistortion,thenbackthe"INPUTGAIN"down(counter‐
clockwise)untilthedistortiondisappears.ThiswillgivetheAi1themostsignaltoworkwithandthebest
signaltonoiseratio.Onceyouhavedeterminedthebestsettingforthe"INPUTGAIN"werecommendthat
youtakenoteofthissettingandalsothesettingsonyourinstrumentcontrolsforfuturereference.
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Precautions:
1)Readandfollowtheseinstructionsbeforeoperatingtheunit.
2)Pleaseheedallsafetywarningsandkeeptheseinstructionsforfuturereference.
3)Donotusethisapparatusnearwaterormoisture.
4)Cleanonlywithsoft,drycloth.
5)Donotinstallnearaheatsourcesuchasradiators,hearregisters,stoves,orotherapparatusthat
produceheat.
6)Onlyuseattachments/accessoriesspecifiedbythemanufacturer.
7)Referallservicingtoqualifiedservicepersonnel.Servicingisrequiredwhentheapparatushasbeen
damagedinanyway,suchas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.
8)Batterynotincluded.UseACadaptorforultimateperformance.
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PowerRequirements:
• Battery:Standard9Vbattery(Powerconsumptionapprox.30mA)
• PowerSupply:9VDC(Regulated),50mAminimum
Attention:Usea“DC”PowerSupplyOnly!Failuretodosomaydamagetheunitandvoidthewarranty
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Specifications:
Input:
Connector: Standard¼”TSJack
InputImpedance1Mohm
LineIn:
Connector: RCA,Unbalanced
InputImpedance10Kohm
Output:
Connector Standard¼”TSJack
OutputImpedance510ohm
DIOUT:
Connector XLRBalanced
OutputImpedance100ohm
LineOut:
Connector: RCA,Unbalanced
InputImpedance1Kohm
Headphone:
Connector 1/8”TRSStereoJack
OutputImpedance5.1ohm
PowerSupply 9VDC‐Battery,ACAdaptor
CurrentDraw >40mA
Dimensions 3.86”x3.62”x2.07”‐(98x92x52)mm(Includingknobsandjacks)
Weight  .55lbs.–248g
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ControlElements
INPUTGAIN:PleaseseeGettingStartedsectionforafulldescriptionoftheINPUTGAINcontrol.
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LEVEL:ThiscontroladjuststheamountofsignalsenttotheOUTPUT,D.I.OUT,LINEOUT,andHEADPHONE
jacks.
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BASS:Thisisan"Active"control.TheBASScontroladjuststheamountofcutorboostinthelowfrequency
(150HZ)range.
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TREBLE:Thisisan"Active"control.TheTREBLEcontroladjuststheamountofcutorboostinthehigh
frequency(5kHZ)range.
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SHAPE:ON/OFF‐ThistoggleswitchenablesordisablestheSHAPEcontrol.Thiscontrolisamiddipcontrol.In
theONposition,themidfrequencieswillbecutandthehighandlowfrequencieswillbeboosted.
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PHASE:Changesthepolarityofthesignal.Phaseaffectsthewaytheguitartopispressurizedbythe
loudspeakers.Whenthesignalsareoutofphasewitheachother,low‐endfeedbackisminimized.Ifyou
experience“positiveacoustic”feedbackonstage,flipthephaseswitchfromitscurrentsettingtokillthe
feedback.Phasewillalsoaffectthewaythesignalmixesliveandwhenrecording.
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GNDLIFT:Whenactivated,theGNDLIFTdisconnectsthegroundconnectionbetweeninputandoutput.
Dependingonthegroundingoftheconnectedequipment,thiscaneliminatehumorgroundloops.
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POWER:ThisLEDilluminateswhentheAi1isactivated.TheAi1willbecomeactivewhenaplugisinserted
intotheINPUTjack.
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INSTRUMENTINPUT:Thisinputisdesignedforallpassiveandactivetypepickupsignals.Whenaplugis
inserted,the9Vbatteryisswitchedon.
BesuretounplugfromtheGUITARINPUTwhentheAi1isnotinusetoconservethebatterylife.Itis
recommendedthatyouturndownyourampormixersinputbeforeplugging/unpluggingfromtheINPUTjack.
Thiswillprotectyourspeakersfromloudpops.
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PHONES:Standard1/8”stereojackforconnectionofheadphones.
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D.I.OUT:PlugastandardXLRcablefromyourPAorrecordingconsoleintothislowimpedancebalanced
output.Usethe“LEVEL"controltosettheoutputlevelwhichmatchesupbestwithyourPAorrecordinggear
andgivesyoutheleastamountofnoise.
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OUTPUT:Thisisastandardunbalancedlineleveloutputsignal.Thisoutputcanbeusedsimultaneouslywith
theD.I.OUTjackforsomecreativesignalrouting.Plugastandardinstrumentcablefromthisoutputtoastage
monitor,amp,orunbalancedMicinputonamixer.
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9VDC–Thisunitcanrunoff9Vbatteryoryoucanconnecta9Vadapter.Theadaptermusthaveabarrel
connectorwithcenternegative.Thebatterymaybeleftinortakenoutwhenusinganadapter.(Toinstallor
replacethe9Vbattery,simplyopentheeasyaccessbatterydooronthebottomoftheunit.Alwaysremember
tounplugyourguitarcordsfromthepedaltoconservebatterylife.
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LINEIN:(Stereo)ThisisaninputforaCD/Tapeplayer,MP3playerorotherequipmentwithRCAtype
connectors.Thesignalpluggedinherewillbeheardthroughalloutputs.(OUTPUT,D.I.OUT,LINEOUT,and
HEADPHONEjacks.)TheLEVELcontroldoesnotaffectthissignal.Volumelevelmustbecontrolledatthe
source.
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LINEOUT:(Stereo)Thisisanoutputthatcanbeusetopatchyouracousticinstrumentintoyourhometheater
systemtoplayyourinstrumentwithoutanexpensiveamplifier,ortopatchintoanyotherequipmentthat
usesRCAtypeinputs.
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BLOCKDIAGRAM