Jds labs C421 v1.00 User manual

c421™v1.00HeadphoneAmplifier

OperatingInstructions

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GeneralUse

Batterymustbefullychargedpriortofirstuse.Seereverseside.

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1. ConnectanaudioplayertotheSourcejackusingaLineOutputAdapteror3.5mminterconnectcable.

2. ConnectheadphonestotheOutputjack.

3. Uponfirstuse,setbasstoFlat,gaintoLow,andturntheVolumeknobtoitsminimumposition.

4. TurntherearPowerswitchon(seereverseside).

5. SlowlyraisetheVolumeknobtoanappropriatelevel.SeeListeningTipsbelow.

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Bassboostcanbeturnedonoroffbymovingthetoggleupordown,respectively.Reducevolume

beforeswitchingbassbooston.Thisfeatureboostslowfrequenciesby+8dB,whichcanoverdrive

theheadphonesand/oropampatespeciallyhighlisteninglevels.

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Youshouldhearnonoiseorwhiningwithyouraudioplayerconnectedandpaused/muted.Every

amplifierishandtestedtoensureproperoperation.Ifnoiseispresentoraudioissignificantly

distortedatallvolumes,tryadifferentinputcable.

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ListeningTips

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UseLowgainunlessvolumecannotbefurtherincreasedwithyoursourceandheadphones.

Formaximumsoundquality,usealine‐outputadapter(LOD).Ifusinga3.5mminterconnectcable,set

ahighsourcevolume(60‐80%)andonlyusetheamplifier'svolumecontrol.

c421canproducedangerouslyloudmusic.Besensibleandlistensafely:www.hearingloss.org

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Thankyouforpurchasingc421.Ifyouhaveadditionalquestionsorcomments,pleasecontactusat:

[email protected]

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JDSLabs.com

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c421ChargingInstructions

c421featuressmartLi‐Ionrechargingtechnology.Typicalchargetimeis3‐5hours.Minimaluserintervention

isrequired:

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1. Connectprovidedmini‐USBcabletoamplifier.

2. ConnectoppositeendofcabletoanyUSBsource.Chargingbeginsimmediately.

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Amplifiermaybeusedwhilecharging,andUSBcordmaybeconnected/disconnectedasdesired.DuetoUSB

currentlimits,chargedurationisfasterwhenc421isOFF.

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MaximumlongevityofanyLi‐Ionbatteryisachievedbyminimizingthenumberofchargecyclesandavoiding

fullychargedorfullydrainedbatteries.

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LEDIndication

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PowerOff



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BatteryLED:Off

PowerLED:Off

PowerOn,

BatteryGood



BatteryLED:Off

PowerLED:Green

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PowerOn,

BatteryLow

~45min.

remaining

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BatteryLED:Red

PowerLED:Green

Charging



BatteryLED:Orange

PowerLED:Blue

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Charging

Complete

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BatteryLED:Off

PowerLED:Blue

BatteryError

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BatteryLED:OrangeFlashing.

Chargecouldnotcompletedueto

insufficientpowerormissingbattery.

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OperatingEnvironment

c421isahigh‐performanceheadphoneamplifier.Excessivetemperatureormoisturemaytemporarilyimpact

soundquality:

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OperatingTemperatureRange: –40°Cto85°C

OperatingHumidityRange:0to85%RelativeHumidity

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ATTENTION:Batteryshallonlybereplacedwithequivalent3.7V,1200mAhLi‐Ionpack.Misuseof

thebatterymaycausefireorburns.JDSLabs,Inc.isnotresponsiblefordamagescausedby

devicemisuse,orfailuretoadheretodeviceinstructions.

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FCCCertifications

NOTE:ThisequipmenthasbeentestedandfoundtocomplywiththelimitsforaClassAdigitaldevice,pursuanttopart15oftheFCCRules.Theselimitsaredesignedtoprovidereasonable

protectionagainstharmfulinterferencewhentheequipmentisoperatedinacommercialenvironment.Thisequipmentgenerates,uses,andcanradiateradiofrequencyenergyand,ifnot

installedandusedinaccordancewiththeinstructionmanual,maycauseharmfulinterferencetoradiocommunications.Operationofthisequipmentinaresidentialareaislikelytocause

harmfulinterferenceinwhichcasetheuserwillberequiredtocorrecttheinterferenceathisownexpense.

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CEMarkWarning

Thisequipmentcomplieswiththerequirementsrelatingtoelectromagneticcompatibility,EN55022classAforITE,theessentialprotectionrequirementofCouncilDirective89/336/EECon