ADL GT40 Questions And Answers

GT40USBDAC Q&A



Q1.ComputerdoesnotrecognizetheGT40

A1‐1.Notconnectedcorrectly

（RefertomanualandcheckiftheGT40isconnectedcorrectlytothecomputerviaUSBcable.）

A1‐2.ThereisaproblemwithaUSBHub

(ADLdoesnotrecommendthe

useofaHubwhenconnectingtheGT40toacomputer)

A1‐3.ComputerdoesnotrecognizetheGT40asboththeplaybackandrecordingUSBdev ice

（DisconnecttheUSBcableandre connectafter10seconds.IfitstilldoesnotrecognizetheGT40restart

thecomputer.）

Q2.Systemerror

occurswhenswitchingbetweensettingsontheGT40

A2.Switchingbetweensettingsduringplayback

（ThereisasmallpossibilityofanOSsystemerrorwhenswitchingbetweensettingsontheGT40duringplayback.

Avoidswitchingduringplayback.）



Q3.Thereisnosound

A3‐1.Thesoundhasbeenmuted

（Open

thevolumecontroltabonthecomputerandunselectmute.）

A3‐2.Volumeoutputsettingistoolow

（Openthevolumecontroltabonthecomputerandsetthevolumetomaximum.）

A3‐3.Anotherdeviceissetasthedefaultplaybackdevice

（OpentheSoundandAudio

DevicepropertiestabandselectUSBAudioDeviceGT40USBDACasdefault

playbackdevice.）

A3‐4.Thereisaproblemwiththeexternalamporspeakers

（ChecktheconnectionbetweenexternalcomponentsandtheGT40LINEOUTRCAjacks.）

A3‐5.Headphonesarepluggedintothe6.3mm

phonejackonthefrontpaneloftheGT40

（Whenheadphonesarepluggedin,therewillbenosignaloutputformtheLineOutjacks.）



Q4.Nosoundfromcomputerinternalspeakers

A4.USBdeviceissetasthedefaultforplayback

（WhentheGT40isselectedas

defaultaudiodeviceforplayback,therewillbenosoundfromthecomputer

speakerswhichisperfectlynormal.）



Q5.Nosoundthroughheadphones

A5‐1.ThevolumeissettoolowontheGT40

（AdjustthevolumeonthefrontoftheGT40totheappropriatelevel）

(WhenadjustingvolumelevelforheadphonestheLineOutRCAjack’svolumelevelisalsoadjusted)

A5‐2.TheGT40powerisnotswitchedon

（PushthepowerbuttonontheGT40frontpanel.Itwillshowasbluewhenswitchedon）



Q6.Unevensoundbalanceduringplayback

A6‐1.Balanceisnotsetaneutral

（Openthevolumecontroltabonthecomputerandsetthebalancetoneutral–centered.）

A6‐2.Thereisabalanceproblemwiththeexternalamporspeakers

（Checkthebalancesettingsonexternalcomponents.）



Q7.Nosoundfrom

CD’sintheCD‐ROMdrive

A7.CD‐ROMdrivedoesnothavedigitaloutput

（IfthesystemdoesnotstreamdigitaloutputfromtheCD‐ROMdrive、thentherewillnotbesoundoutputvia

USB.CD‐ROMdrivesandCDtransportsmustbeconnectedtotheLINEIN

RCAjacksforlisteningwithheadphones)



Q8.NosoundviaLINEINRCAjacks

A8‐1.Checkthattheconnectionsarecorrect

（ChecktheconnectionbetweenexternalcomponentsandthePhono/LineInput.Iftherearenoproblems

withtheexternalcomponents,thencheckthecableconnection.）

A8‐2.There

isnosoundoutputfromexternalcomponents

（Checkifthereissoundoutputfromexternalcomponents.）

A8‐3.TheselectorswitchonthefrontoftheGT40lightsupgreen

（Iftheselectorswitchisgreen,thecomputerissetasthesoundsourceviaUSB.）

A8‐4.Incorrect

settingoftherearpanelInputSelectorSwitch （Phono（MC）・Phono(MM) ・Line）

（Selecttheappropriatesettingforyouranaloginputsource.）



Q9.Notabletorecord

A9‐1.Anotherdeviceissetasthedefaultrecordingdevice

（OpentheSoundandAudioDevicepropertiestaband

selectUSBAudioDeviceGT40USBDACasthedefault

recordingdevice.）

A9‐2.Checkthatconnectionsarecorrect

（ChecktheconnectionbetweenexternalcomponentsandthePhono/LineInput.Ifthereisnoproblemwith

theexternalcomponents,thencheckthecableconnections.）

A9‐3.Checkifrecordingsoftware

(notsuppliedwithGT40)recognizestheGT40asthedefaultrecordingdevice

※ RecordingsoftwareisrequiredtorecordusingtheGT40.Furutechrecomme ndsfree‐to‐download

softwareAudacity:http://audacity.sourceforge.net/

A9‐4.ChecktoseeifbothInputandOutputsettingsintheSoundorMIDIapplicationarenotsetto24bit/96KHz

TheTENORchipusedintheGT40hasabandwidthlimitationof12Mbps(USB2.0fullspeedoperation),and

duetothislimitationonly oneI2Sinputoroutput

canbesetfor24bit/96KHzapplicationatonetime.

Therefore,underthiscondition,forsimultaneousmultiple‐channelapplicationsotherI2Sinterfacesmust

beconfiguredat16‐bit/48KHzor16‐bit/96KHz.Inotherwords,whenrecordingitisnecessarytosetthe

audioInputonthecomputerto24bit/96KHz(PC‐Sound

application;MAC‐MIDIapplication),butdonotset

nottheaudioOutputto24bit/96KHz.TheOutputshouldbesettoalower16bitresolutionuntilrecording

isdone.Thenwhenyouwanttoplaybackyour24bit/96KHzfilesthroughtheGT40youneedtoresetthe

outputto24bit/96KHzandresetthe

inputtoa16bitresolution.



Q‐10.Soundcutsout

A10‐1.Duringplaybackorrecordingthecomputer’sCPUoverloads

（Especiallyduringrecordingmakesureallothercomputerapplicationsareclosed.）

A10‐2.DuringplaybackorrecordinganotherUSBdeviceisconnectedtothecomputer

（ThesoundwillcutoutduringplaybackorrecordingifanotherUSBdeviceis

connectedtothecomputer.）

A10‐3.CPUisunabletoprocessdatafastenough

（IftheCPUdoesnotmeettherequiredspecificationstheexpectedresultsmaynotoccur.IftheCPUmeets

therequirements,butthesoundcutsout,closeallotherapplicationsoradjustsettingsintherecording

software）

A10‐4.ChecktoseeifbothInputandOutputsettingsintheSoundorMIDIapplicationarenotsetto24bit/96KHz.

TheTENORchipusedintheGT40hasabandwidthlimitationof12Mbps(USB2.0fullspeedoperation),and

duetothislimitationonly oneI2Sinput

oroutputcanbesetfor24bit/96KHzapplicationatonetime.

Therefore,underthiscondition,forsimultaneousmultiple‐channelapplicationsotherI2Sinterfacesmust

beconfiguredat16‐bit/48KHzor16‐bit/96KHz.Inotherwords,whenrecordingitisnecessarytosetthe

audioInputonthecomputerto24bit/96KHz

(PC‐Soundapplication;MAC‐MIDIapplication),butdonot set

nottheaudioOutputto24bit/96KHz.TheOutputshouldbesettoalower16bitresolutionuntilrecording

isdone.Thenwhenyouwanttoplaybackyour24bit/96KHzfilesthroughtheGT40youneedtoresetthe

outputto24bit/96KHzand

resettheinputtoa16bitresolution.



Q11.Noiseandinterference

A11‐1.TheGT40isplacedtoonearapplianceswithstrongmagneticfieldslikeTVs

（Placeatadistancefromapplianceswithstrongmagneticfield）

A11‐2.Checkthecomputer’sACadaptor

(Thereisthepossibilitythatthe

adaptorisnotprovidingstablequalitypower:Noiseat60Hzor120Hzor

both)

A11‐3.Connectionsarenotcorrect

（Checkallterminalsforcorrectconnection）

A11‐4.ChecktoseeifbothInputandOutputsettingsintheSoundorMIDIapplicationarenotsetto24bit/96KHz.

The

TENORchipusedintheGT40hasabandwidthlimitationof12Mbps(USB2.0fullspeedoperation),and

duetothislimitationonly oneI2Sinputoroutputcanbesetfor24bit/96KHzapplicationatonetime.

Therefore,underthiscondition,forsimultaneousmultiple‐channelapplicationsotherI2Sinterfacesmust

configuredat16‐bit/48KHzor16‐bit/96KHz.Inotherwords,whenrecordingitisnecessarytosetthe

audioInputonthecomputerto24bit/96KHz(PC‐Soundapplication;MAC‐MIDIapplication),butdonotset

nottheaudioOutputto24bit/96KHz.TheOutputshouldbesettoalower16bit

resolutionuntilrecording

isdone.Thenwhenyouwanttoplaybackyour24bit/96KHzfilesthroughtheGT40youneedtoresetthe

outputto24bit/96KHzandresettheinputtoa16bitresolution.



IfnoiseisexperiencedwhileusingGT 40withaturntable:

A11‐3. Stepone:Disconnectphonocablefrom

GT40analogline‐injacksmomentarilyandthenreconnect.

A11‐4. Steptwo:ConnectpowersourcesforGT40,turntableandcomputertothesamepowerstrip/Power

distributor



Q12:CantheADLGT40beuseddirectlywithactivespeakersviathespeaker’sRCAinputs?

A12:Yes,Pleasenotethat

whenpairingtheGT40withsuchactivesspeakers,beforeplaybacktheGT40volume

shouldbesetatitsmaximumandthespeakervolumeatitsminimum.Volumewouldthenbeadjustedatthe

speakers.



Q13:CantheADLGT40beusedasapreamplifier

A13:TheGT40hasbeendesignedtoworkwithapreamp,butitputsoutenoughvoltagetobepaired

withanamp

andsensitivespeakersanduseddirectlywithitshighqualityvolumecontrol

A13‐1:ThevolumecontrolwilladjustvolumeforboththeheadphoneoutputandRCAlineoutoutput.



Q14.CantheGT40beusedwith64bitoperatingsystems?

A14:Yes



Q15:IstheGT40compatible

withWASAPI?

A15:WASAPIisanOSapplicationandmaynotbecompatiblewithsomeplaybacksoftware.Foorbar2000softwareis

knowntobecompatiblewithWASAPI.



Q16:IsitpossibletoconnectlinearPCMrecordersdirectlytotheGT40viaUSBforplayback?

A16:TheGT40USBDACiscompatiblewith

computerbasedsound dataonly.PleaseuploadPCMrecordeddatato

yourcomputerandthenplaybackviatheGT40. 



Q17:ThemanualpackagedwiththeGT40doesnotshowset‐upinstructionsforWindows7.IstheGT40

compatiblewithWindows7?

A17:theGT40iscompatiblewithWindows7

andtheset‐upinstructionsandthesameasthoseofWindowsVista

showninthemanual.



Q18:IwouldliketorecordLPstoharddrive.Isitnecessarytoinstalladriver?

A18‐1.Installationofadriverisnotnecessary.Howeverrecordingsoftwareisnecessary.

softwareAudacity:

http://audacity.sourceforge.net/

A18‐2.Importantnotewhenrecording:ChecktoseeifbothInputandOutputsettingsintheSoundorMIDI

applicationarenotsetto24bit/96KHz.

TheTENORchipusedintheGT40hasabandwidthlimitationof12Mbps(USB2.0fullspeedoperation),and

duetothislimitation

onlyoneI2Sinputoroutputcanbesetfor24bit/96KHzapplicationatonetime.

Therefore,underthiscondition,forsimultaneousmultiple‐channelapplicationsotherI2Sinterfacesmust

beconfiguredat16‐bit/48KHzor16‐bit/96KHz.Inotherwords,whenrecordingitisnecessarytosetthe

audioInputonthe

computerto24bit/96KHz(PC‐Soundapplication;MAC‐MIDIapplication),butdonotset

nottheaudioOutputto24bit/96KHz.TheOutputshouldbesettoalower16bitresolutionuntilrecording

isdone.Thenwhenyouwanttoplaybackyour24bit/96KHzfilesthroughtheGT40youneedtoresetthe

outputto24bit/96KHzandresettheinputtoa16bitresolution.



Q19:WhywilltheGT40onlyworkwithanAC9V500mAadaptor? Whywon’tanAC9V2000mAadaptorwork?

A19‐1.Pleasecheckthe“NoLoad”outputACvoltageoftheAC9V2000mAadapter.The“NoLoad”voltageof

an

AC9V500mAadaptorisunderAC11V(necessary)andthismustbethesameforanAC9V2000mAadapter.Ifthe“No

Load”voltageisgreaterthanAC12VthentheIC4LM7806andIC8LM7906mayoverheat.

Wedon'tsug gestreplacingitifthenoloadoutputACvoltageoverAC12V.

A19‐2.TheGT40hasalinearpowertransformer,notaswitchingmodepowersupply.AlsotheGT‐40'sadaptorisan

AC9V500mAandcannotbereplacedwithaDC9V2Aadaptor.



Q20:IsitpossibletoconnectlinearPCMrecordersdirectlytotheADLGT40viaUSBforplayback?

A20:TheespritUSBDACiscompatiblewithcomputerbasedsounddataonly.PleaseuploadPCMrecordeddatato

yourcomputerandthenplaybackviatheEsprit.



Q21:DoestheADLGT40’sfront

panelvolumecontroladjustvolumefortheheadphoneoutputonlyordoesitalso

adjustvolumeoutputfortherearpanelLineOutjacks?

A21:ThevolumecontroladjustvolumeoutputforbothHeadphoneandLineOutjacks,sotheADLGT40canbeused

asapreamplifier



Q22:When

theGT40isconnectedtoapreampisitpossibletoadjusttheheadphoneoutputvolumeatthe

externalpreamp?

A22:No,theheadphoneoutputvolumecanonlybeadjustedwiththeGT40’svolumecontrol.



Q23:Isitpossibletolistenviaexternalspeakers(lineout)whileheadphonesarepluggedinto

theGT40’s

headphonejack?

A23:yes,therewillbesignaloutputfromthelineoutjackswhileheadphonesarepluggedintotheGT40headphone

jack.



Internaluseonly:

Q1:Unbalance(gangerror)experiencedwhenadjustingvolumefrom9O’clocktolowestlevel:

GT40usesananalogtypedualvolumecontrolandanunavoidable,howeververysmallunbalancecanbe

experiencedinsomeunits.Furutechhaspreparedselect analogtypedualvolumecontrolreplacementpartsfor



servicingsuchclaims:

Stepstoresolveclaim:

1. Havetheunitreturnedandassessthelevelofunbalance

2. Comparewithanotherstockunitandfindaunitwithnounbalanceandsendreplacementtocustomer.



Q2:Humnoiseheardthroughheadphoneorsystemwhenpowerisoff:

Reason:High

impedancewhencircuitisclosed.Whenunitisswitchedon,noisedisappears.

Problemcorrectedinsecondproductionlot.



Q3:IsitpossibletorecordhighqualityanalogsignalonMACOSX10.6.4application“GarageBand”?IsGarageBand

compatiblewithCoreAudio?

FurutechhasnottestedtheGT40withMACOS

applicationsandweareunabletoanswerquestionsregarding

GarageBandorCoreAudio.TheGT40recordingcapabilitiesweretestedusingfree‐to‐downloadsoftwareAudacity.



Q4:ASIOdriver

TheGT40iscompatiblewithASIOdrivers

Q5:USBasynchronous

(TE7022L)ISO>Adaptivemode>PLL+DPLL>Sync(lessjitter).Notasynchronous.



Q6:Soundsuddenlycutsoutduringplayback

Cause:staticelectricitybuildupinlowhumidityconditions.

Problemcorrectedinsecondproductionlot



Q7:NoiseexperiencedwhenGT40isconnectedtoaturntable

TryconnectingGT40,

turntableandcomputertothesamepowerstriporpowersource

ConnectedphonocablegroundwiretoGT40earthscrew

Checkthecomputer’sACadaptor(Thereisthepossibilitythattheadaptorisnotprovidingstablequalitypower:

Noiseat60Hzor120Hzorboth)



Q8:MACOSMidiapplication

IftheMidisettingis24bit/96kHzonbothinputandoutput,recordingsoftwaremayfreeze.IftheMidisettingisset

to16bit/96kHzononeofeithertheinputoroutputsettings,recordingsoftwarewillnotfreeze.

IftheMidisettingis24bit/96kHzoninput,

outputissetto16bit/96kHz:Itispossibletosave24bit/96kHzfileson

theGT40.

(WindowsOS:Itispossibletosave24bit/96kHzfiles)



Q9:IstheGT40compatiblewithMACOSLion?

Yes.



Q10:ComputerdoesnotrecognizetheGT40

Thereispossibility

ofaUSBcableconnectorproblemorPCUSBportproblem.ChangecablesortryanotherUSB

port.

IfnotrecognizedoneitherMACorPC,thereisapossibilityofGT40USBsocketproblem.



Q11:IsthedatatransferbandwidthUSB2.0orUSB1.0?

TheGT40usesaTE7022L

USB2.0Fullspeed(12Mbit/s)limitedDAC,notUSB2.0Highspeed(480Mbit/s). 



USB3.0

SuperSpeed:5Gbit/s

‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐

USB2.0(TE7022LUSBIC:USB2.0FullSpeedcompliant)

High‐Speed:480Mbit/s

FullSpeed:12Mbit/s(USB1.0supported)

LowSpeed:1.5Mbit/s(USB1.0supported)

‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐

USB1.0or1.1

FullSpeed:

12Mbit/s

LowSpeed:1.5Mbit/s



Q12.  Experiencingnoiseaftercon nec t ionofUSBcable:

Computerswitchingadaptorscanbeasourceofnoise.Trychangingthecomputersswitchingadaptor.

Thiswasprobleminpastlots.Thishasbeencorrected.



Q12. Soundfromonlyonechannelandnoiseisexperienced:

Playback from computer source is  normal and

 noise is experienced when playback via line in ja cks. Problem with

unit’sphonoorlineinputjacks.



Q13.Powersuddenlycutsoutandpowerlampfailstolight.ProblemsstilloccursafterchangingACadaptor:

Defectiveunitfrom2

lot.



Q14. CanaMCcartridgewithoutputof0.5mV(1kHz、5cm/sec.)beuse dwiththeGT40?

GT40’slineinputisMC=0.4mV、MM=5mV,sonoproblem.



Q15. Isitpossibletorecordinstrumentsusingamicrophone?

IfthemicrophonecomponenthaslineoutputjacksthenitispossibletoconnectwithGT40’slineinputjacks



Q16. NoiseisexperiencedduringrecordingofanalogsignalviaUSBconnection:

Pastlotshadthisproblem.Ithasbeencorrectedincurrentlots.



Q17. Whenheadphonesarepluggedinanoiseisexperiencedwhentheon/offswitchispressed:

Thisisnormal.ThenoiseheardissmallamountofDCvoltagecomingoutoftheoutputjackswhenthepoweris

switched

on.Thiswillnotaffectheadphonesatgenerallistingvolume.



ADL GT40 Questions And Answers

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