NHT A-10 Owner's Manuals

Brand: NHT

Model: A-10

Category: Supplementary music equipment

Type: Owner's Manuals

A-10

OwnersManual

A-10LeftMonitorSerialNumber:

A-10RightMonitorSerialNumber:

A-10ControlAmplifierSerialNumber:

CAUTION

RISKOFELECTRICSHOCK

DONOTOPEN

WARNING:SHOCKHAZARD-DONOTOPEN.

AVIS:RISQUEDUCHOCELECTRONIQUE-

NEPASOUVRIR.

SafetyInstructions--PleaseReadFirst

DETAILEDSAFETYINSTRUCTIONS:

Allthesafetyandoperationinstructionsshouldbereadbeforetheapplianceisoperated.

RetainInstructions:

Thesafetyandoperatinginstructionsshouldberetainedforfuturereference.

HeedWarnings:

Allwarningsontheapplianceandintheoperatinginstructionsshouldbeadheredto.

FollowInstructions:

Alloperationanduserinstructionsshouldbefollowed.

WaterandMoisture:

Theapplianceshouldnotbeusednearwater(e.g.nearabathtub,washbowl,kitchensink.laundrytub,inawetbasement,ornearaswimmingpool

etc.).

Ventilation:

Theapplianceshouldbesituatedsothatitslocationorpositiondoesnotinterferewithitsproperventilation.Forexample,theapplianceshould

notbesituatedonabed,sofa,rug,orsimilarsurfacethatmayblocktheventilationopenings,orplacedinabuilt-in installation,suchasabookcase

orcabinetthatmayimpedetheflowofairthroughtheventilationopenings.

Heat:

Theapplianceshouldbesituatedawayfromheatsourcessuchasradiators,heatregisters,stoves,orotherappliances(includingother

amplifiers)thatproduceheat.

PowerSource:

Theapplianceshouldonlybeconnectedtoapowersupplyofthetypedescribedintheoperatinginstructionsorasmarkedonthe

appliance.

GroundingandPolarization:

Precautionsshouldbetakensothatthegroundingorthepolarizationmeansoftheapplianceisnotdefeated.

PowerCordProtection:

Powersupplycordsshouldberoutedsothattheyarenotlikelytobewalkedonorpinchedbyitemsplaceduponoragainst them,paying

particularattentiontocordsandplugs,conveniencereceptaclesandthepointwheretheyexitfromtheappliance.

Cleaning:

Theapplianceshouldonlybecleanedasrecommendedbythemanufacturer.

Non-usePeriods:

Thepowercordoftheapplianceshouldbeunpluggedfromtheoutletwhenleftunusedforalongperiodoftime.

ObjectandLiquidEntry:

Careshouldbetakensothatobjectsdonotfallandliquidsarenotspilledintotheenclosurethroughopenings.

DamageRequiringService:

Theapplianceshouldbeservicedbyqualifiedservicepersonnelwhen;

Thepowersupplycordortheplughasbeendamaged;or

Objectshavefallen,orliquidhasbeenspilledintotheappliance;or

Theappliancehasbeenexposedtorain;or

Theappliancedoesnotappeartooperatenormallyorexhibits amarkedchangeinperformance;or

Theappliancehasbeendropped,ortheenclosuredamaged.

Servicing:

TheusershouldnotattempttoservicetheappliancebeyondwhatisdescribedintheOperatingInstructions.Allotherservicingshouldbe

referredtoqualifiedservicepersonnel.

CAUTION:Toreducetheriskofelectricshock,donotremovethe

cover(orback).Nouserserviceablepartsareinside;referservicingto

qualifiedpersonnel.

WARNING:Toreducetheriskoffireorelectricshock,donotexpose

thisappliancetorainormoisture.

Thissymbolwhereveritappears,alertsyoutothepresence

ofuninsulateddangerousvoltageinsidetheenclosurethat

maybesufficienttoconstituteariskofelectricshock.

Thissymbol,whereveritappearsalertsyouto

importantoperatingandmaintenanceinstructionsinthe

accompanyingliterature.Readthemanual.

RackRail

A-10

Amplifier

FrontPanel

Screws

Insulating

Washers

Fig.1:RackMountingDetail

INTRODUCTION:

ThankyouforyourselectionoftheA-10.Yourstudiomonitorsareacriticalelementinthecountlessdecisions

madeduringrecording,mixing,masteringandotherkeyaspectsofaudioproduction.Theymustdelivera

transparent,neutralandrevealingassessmentofsound,sothatyouhavetheinformationyouneedtochooseand

placemicrophones,setEq’s,balancemixes...deliverexceptionalproduct.TheA-10iscapableofstate-of-the-art

sonicresolutionandflexibility.InvestingtimetolearnabouttheA-10’sfeaturesandoperationwillrewardyouwith

thebestpossibleperformance.

Ifyourequireassistanceatanytimeduringorafterthesetupprocess,callourCustomerServiceHotLineat1-800-

NHT-9993(648-9993).Youcanalsovisitourwebsiteatwww.nhtpro.comformoreindepthtechnicalinformation.

Thanksagainforyourconfidenceinourproducts!

GETTINGSTARTED:

TheA-10isauniquesystemthatcombinesadedicatedcontrolamplifierwithloudspeakermonitorcabinets,using

controlledimpedancecablesthatactuallyformpartofthecrossovernetwork.Bydesigningthesystemasanintegral

packageinthismanner,manyoftheadvantages ofself-poweredspeakerscanberealizedwithoutattendant

performancecompromise.However,itmustberecognizedthatthecontrolamp,cablesandmonitorsarean

inseparablepackage.

ThefollowingareincludedintheControlAmplifiercarton:

1ea.-ControlAmplifier2ea.-20'MonitorOutputCables

1ea.-6'IECPowerCord4ea.-10-32RackMountingScrews

1ea.-WarrantyRegistrationCard8ea.-PlasticInsulatingWashers

TheA-10MonitorsmustonlybeusedwiththeA-10ControlAmpandcables,andviceversa.

TheA-10ControlAmplifiermaybeusedonashelf,ormountedinastandard19”equipmentrackusingthe

screwsandwasherssupplied.Forrackmounting,removeandretainthefourfeetfromthebottomoftheamp

chassisusinga#2Philipsscrewdriver.Twoverticalrackspacesarerequired,butwerecommendyouleaveatleast

oneadditionalopenspaceaboveandbelowtheA-10forimprovedcooling,asyouwouldwithanyhighpower

amplifier.Fortableorshelfuse,thefourfeetmustremainattachedtoallowforaircirculation.Asastartingpoint

forspeakerplacement,alignthebackoftheenclosuresparalleltotherearwall,withtheangledfrontsfacingin

towardsyou.Formoredetailedspeakerplacementinformation,seepage7.

Fig.2TypicalSystemConfiguration

Signalflow

ToACLine

Signalflow

MonitorOutputCables

A-10

Control

Amplifier

POWER

SENSITIVITY BOUNDARY POSITION

+11

-3

-10 NF

MF0

SYSTEMCONNECTIONS:

CONTROLAMPLIFIERINPUTSECTION:TheA-10ControlAmplifieracceptsbothbalancedand

unbalancedinputsoneitherXLRor1/4”TRSconnectors.Theseconnectorsarehardwiredinparallelwithinthe

A-10toallowforconvenientequipmentchaining,butonlyonesignalsourceshouldbephysicallyconnectedto

theunitatanytime.Figure3aindicatesproperwiringprotocolforeachtypeofconnector.Sincethereare

manydifferentconnectortypesandsignallevelsemployedbysourceequipment,someexperimentationmaybe

necessary,keepinginmindthatA-10canaccept awiderangeofsignalsandhasaninputsensitivitycontrolon

thefrontpanel.

SPEAKERCABLECONNECTIONS:TheA-10includestwo20’specialpurposecablestoconnecttheControl

unittotheMonitors.Whilethesecableslooksimilartostandardmicrophonecables,theyareconstructedwith

lowerandmoreconsistentconductorimpedance.PortionsoftheA-10’scrossovercircuitryarelocatedinboth

theamplifierandspeakerenclosures,andthecablessuppliedareanimportantpartofthiselectricalnetwork.

Thisallowsthespeakercablestofunctionasaneutralandtransparentcomponentinthesystem.Replacingor

extendingthesuppliedcableswithanyothertypewillhaveavarying,andonlypartlypredictableimpactonthe

soundoftheA-10.Ifyourinstallationrequirestheuseofalternativecables,youmayconsultthesuppliedtable

listingourmeasurementdataonavarietyofcabletypes.BesuretheyarewiredasshowninFig.3a.These

considerationsaside,usingthesuppliedNHTProcablestoconnectthecontrolamplifierisquitesimpleand

straightforward.Boththeamplifierandthemonitorsaremarkedwiththeappropriate“left”and“right”channels.

FittheXLRconnectorsintothecorrespondingconnectorsonthecontrolamplifierandmonitorsuntilthe

connectorlocks.

WARNING:IFUSINGCABLESOTHERTHANTHOSESUPPLIEDWITHTHISSYSTEM,BESURE

THATNOCONDUCTORISWIREDTOTHEXLRCASING.FAILURETODOSOMAY

CONSTITUTEARISKOFELECTRICSHOCK.

CAUTION:MAKEALLCONNECTIONSWITHTHEACPOWEROFF!

CAUTION:CONNECTINGTHEOUTPUTOFTHEA-10CONTROLAMPLIFIERTOANY

EQUIPMENTOTHERTHANTHEA-10MONITORMAYCAUSEEQUIPMENTDAMAGE.

Fig.3aBalancedWiringDiagram

+(SIGNAL)

-(GND)

Shield

SOURCE

A-10INPUT

Fig.3bUnbalancedWiringDiagram

NHTPro

MODELA-10MONITORPOWERMODULE.

SERIALNO:

NHTPro.

BENICIA,CALIFORNIA,U.S.A.

A10-A-10001

MADEINTAIWAN G1

A-10MONITOR

LEFT

CAUTION:

CONNECTINGOUTPUTSTOANY

PRODUCTOTHERTHANNHTPro

A-10MONITORMAYRESULTIN

SEVEREEQUIPMENTDAMAGE.

A-10MONITOR

RIGHT

FUSETYPE:

T5A250VFOR110/120V.

T3A250VFOR220/240V.

50/60Hz-600W

INPUTVOLTAGE

CAUTION

RISKOFELECTRICSHOCK

DONOTOPEN

WARNING:SHOCKHAZARD-DONOTOPEN.

AVIS:RISQUEDUCHOCELECTRONIQUE-

NEPASOUVRIR.

FORCONTINUEDPROTECTIONAGAINST

RISKOFFIREREPLACEONLYWITHSAME

TYPE250VFUSE.

CAUTION:

NHTisaregisteredtrademarkoftheRecotonCorporation.

Fig.4A-10ControlAmplifierRearPanel

USINGTHEA-10CONTROLFUNCTIONS:

TheA-10controlsaredesignedforutilityandrepeatabilityundervaryingconditions.Youshouldfindtheeffects

ofthecontrolssonicallysubtle,withlittleimpactonthebasiccharacterandaccuracyofthespeaker.We

encourageexperimentationtofinetunethesystemtotherequirementsofyourparticularinstallation.

POWERINDICATORS:JusttotheleftofthepowerswitchontheA-10ControlAmplifieraretwopower

relatedLED's.Theupper(green)LEDlightsupindicatingthereisACpowertotheamplifierandthePOWER

SWITCHisinthe“on”position.Thelower(red)LEDindicatesaclippingoroverloadcondition.Occasional

flashingofthisindicatorisagentlewarningyouarereachingthesystem’slimits.IftheredLEDglows

continually,severeclippingisoccurring.Theinputsignalorsystemgainshouldbereducedtoavoidtheriskof

possiblesystemdamage.

SENSITIVITY:Thiscontrolisusedtochangetheinputsensitivitywithsettingsat;-10dB,-3dB,+4dB,+11dB

and(M)uteprovidingnoisefree,consistentgainmatchingwithawidevarietyofequipment.Thepropersettingis

thelowestsensitivitypossible(highestdBnumber)whichallowsthespeakertoreachthemaximumdesired

outputwithoutsourceclipping.Professionaldevicestypicallyspecfulloutputat+4dB,mostconsumeraudio

productsreachfulloutputat-3dB,andmostcomputersoundcardshaveafullscaleoutputof-10dB.Consultthe

owner’smanualforthedeviceconnectedtotheControlAmplifierforitsoutputlevelspecificationsandsetthe

SENSITIVITYswitchaccordingly.

BOUNDARYCONTROL:Reflectiveboundaries,suchasfloors,walls,eventabletops,reinforceaspeaker’slow

frequencyoutput.Conversely,placingspeakersoutintoaroomdecreasesbassresponse.Thegreatestlow

frequencyoutputiswiththeBOUNDARYcontrolinthe“0”position,whichassumesnosignificantboundary

reinforcementispresent.Thecontrolattenuateslowfrequenciesby3dB(at50Hz),withrapidlydecreasing

effectabove300Hz.RefertothediagraminFig.6forinformationonsettingthecontrolappropriately.

Fig.6:BoundaryControlSettingsDiagram

HalfSpace

WholeSpace

A-10

Control

Amplifier

POWER

SENSITIVITY BOUNDARY POSITION

+11

-3

-10 NF

MF0

Fig.5A-10ControlAmplifierFrontPanel

POSITIONCONTROL:Closeinmonitoring,sometimesreferredtoas“near-field”reducestheeffectofroom

acousticsonthesignal,andprovidesgreatdetail.Mid-fieldlisteningrevealsaspectsofrecordedambienceandis

morerepresentativeofenduse.However,aspeaker’supperfrequencypowerresponsechangeswithdistance,due

toroominfluencesandairabsorption.TheA-10maybeadjustedforflatresponseattwolisteningdistances.

Themaximumhighfrequencyoutputisobtainedwiththecontrolinthe“FF”(far-field)position.Inthenear-

field,thecontrolattenuates20kHzby 2.5dB,withnoeffectonfrequenciesbelow3kHz.SeeFig.7forthe

appropriatePOSITIONcontrolsettingbasedonlisteningdistance.

SPEAKERPLACEMENT:

TheA-10isintendedtoprovideconsistentperformanceoverawiderangeofplacementsituations.Thisis

accomplishedthroughtheuseofelectricalcontrols,widedispersiondrivers,advancedenclosuredesignand

carefullychosencrossovercharacteristics.Nevertheless,itisalwaysworthinvestingtimeandeffortexperimenting

withoptimumloudspeakerplacement.Inallcases,A-10Monitorsshouldbesetupsymmetricallyequidistant

fromthelisteningposition;theleftspeakerandrightspeakershouldbeatthesamerelativepositionswithrespect

totheprimarylisteningarea.Thisisimportantinorderthehearaproperstereosoundstage.Thespeakerbaffles

angleintowardsthelisteningpositionwiththeloudspeakerbacksparalleltooneanother.Agoodstartingpoint

canbefoundinFigure8below.Ideally,thetweeterheightshouldbeonaxiswithyourears,orslightlyabove.

Also,rememberthatnearbyreflectivesurfacescanalterimpulseresponseandblurimagingandtonality.

POSITION

Near-Field

Mid-Field

Listening

Distance

A-20

Monitor

A-10

Monitor

Fig.7PositionControlSettingsDiagram

< 1M

2-3M

ListeningPosition

Fig.8IdealMonitorPlacement

SYSTEMOPERATION:

TheA-10iscapableofveryhighoutputlevels,especiallywhenlisteninginthenear-field.Still,everyspeaker

systemhasitslimits.Protectyourearsandusecommonsense.Harshbreakupatextremelyhighvolume,orheat

emanatingfromthedriversisanindicationthatthesystemhasexceededitsoutputlimitsandyoushouldlower

theplaybacklevel.Andwatchforexcessivelightingoftheamplifierfrontpanelclippingindicator.Speaker

damagemostoftenoccursfromsustainedhighvolumelevels,notfromtransientsoundsorbriefmusicalpeaks.

A-10STUDIOMONITORSYSTEMCARE:

Exceptfortheoccasionalflatteringcomment,yourA-10needsnoregularmaintenance.Neverattempttoclean

theA-10Monitordriverunitsexceptforverylightfeatherdusting.TheA-10MonitorcabinetandtheA-10

ControlAmplifierfrontpanelcanbecleanedusingadamp,softcottonclothfirstsprayedwithamild,

nonabrasiveglasscleaner.Neverspraythespeakeroramplifierdirectly!Avoidsiliconeoroilbasedcleanersor

treatments.

NEEDHELP?

TechnicalSupportcanbereachedseveralways:Telephoneustoll-freeat(800)-NHT-9993(648-9993),E-mailus

at:Tech@nhtpro.com,Faxusat:(707)748-5945orwriteusat:NHTPro,527StoneRd.,Benicia,CA94510.Or

visitourwebsiteatwww.nhtpro.com.

SYSTEMSPECIFICATIONS:

Type:Modular,twopiecepowerednear/midfieldmonitor.

Configuration:2-wayacousticsuspension.

Woofer:6.5"treatedpaper.

Tweeter:1"softdome.

MagneticShielding:Full.

PERFORMANCESPECIFICATIONS:

AmplifierPower:150W(continuousRMS/ch),300W(100mspeak).

PeakAcousticOutput:116dBSPL(100mspinknoise@1M).

Residualhum/noise:<10dBSPL(Aweighted@1M).

THD@90dBSPL:<0.8%(100Hz~10kHz@1M).

SystemResponse+/2dB(1/3oct.sweptnoise):57Hz~20kHz@1M,55Hz~20kHz@2M.

-6dBLFcutoff:50Hz(inroomresponse).

LoudspeakerDimensions/Wgt.:11.9"hx7.5"wx10.7"d/14lbs.

LoudspeakerMaterials:0.75"MDFw/highpressurelaminate(internal+external).

ControlAmplifierDimensions/Wgt.:3.5"hx19"wx13.25"d/32lbs.

FEATURES/CONTROLS:

Connectors:

Input:XLR,TRS.

Outputtomonitor:XLR.

Controls:

Sensitivity:5position(-10dB,-3dB,+4dB,+11dB,Mute).

Wallproximity(Boundary):2position(0.0,1.0).

ListeningProximity(Position):2position(near/mid).

Power:On,off.

LEDDisplays(2):

Power.

Overload.

NHTPro

527StoneRd.

Benicia,CA94510

ph:(707)748-5940

fx:(707)747-1252

www.nhtpro.com

NHT A-10 Owner's Manuals

Brand: NHT

Model: A-10

Category: Supplementary music equipment

Type: Owner's Manuals

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NHT A-10 Owner's Manuals

NHT A-10 Owner's Manuals

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