GMA4704 - AV receiver PIONEER - Free user manual and instructions

Product type	Power amplifier, 4-channel bridgeable
Brand	Pioneer
Model	GM-A4704
Weight	2.0 kg (without wiring)
Supply voltage	14.4 V DC (10.8 to 15.1 V acceptable)
Power consumption (continuous)	20.5 A (4 Ω)
Average power consumption	5.5 A (4 channels, 4 Ω) / 8.5 A (2 channels, 4 Ω)
Fuse	30 A × 1
Maximum output power	80 W × 4 (4 Ω) / 130 W × 4 (2 Ω) / 520 W total (bridged)
Continuous output power	40 W × 4 (14.4 V, 4 Ω, 20 Hz-20 kHz, ≤1% THD+N) / 130 W × 2 (bridged, 1 kHz, ≤1% THD+N) / 65 W × 4 (14.4 V, 2 Ω, 1 kHz, ≤1% THD+N)
Load impedance	4 Ω (2 Ω to 8 Ω acceptable)
Frequency response	10 Hz to 70 Hz (+0 dB, -3 dB)
Signal-to-noise ratio	94 dB (IEC-A network)
Total harmonic distortion	0.05% (10 W, 1 kHz)
Low-pass filter (channel A)	Cutoff frequency 80 Hz (adjustable from 40 Hz to 500 Hz)
Maximum input level / impedance (RCA)	6.5 V / 22 kΩ
Maximum input level / impedance (speaker)	26 V / 16 kΩ
Main functions	LPF/HPF selection, gain adjustment, 2CH/4CH input selection, bass boost (0/6/12 dB), built-in protection
Maintenance and cleaning	Clean with a dry, soft cloth. Do not use solvents or abrasive products.
Safety	Use a 30 A conforming fuse. Connect the ground wire first. Do not expose to liquids. Respect speaker impedances.
Spare parts and repairability	30 A fuse (sold separately), battery wire and ground wire RD-223 recommended. Contact an authorized Pioneer center for any repairs.
General information	Website: www.pioneer-car.fr. Product registration recommended.

Frequently Asked Questions - GMA4704 PIONEER

How to bridge the channels to get a more powerful mono output?

For a bridged connection, use the output terminals of channels A and B respecting polarities: the positive wire of the speaker on the positive terminal of channel A and the negative wire on the negative terminal of channel B. Make sure the resulting impedance is at least 4 Ω (e.g., a 4 Ω speaker or two 8 Ω speakers in parallel). Refer to diagram A in the manual.

What type of power cable is recommended?

It is recommended to use a special red battery wire and a ground wire RD-223 (sold separately). The battery wire should be connected directly to the vehicle battery positive terminal and the ground wire to the chassis.

How to adjust the gain of the amplifier?

Gain adjustment should align the head unit output with the amplifier. Start with the setting at NORMAL position. If sound is weak at high volume, turn the control to a lower level. In case of distortion, turn to a higher level. For a 4 V RCA output, use the HIGH position.

What to do if the amplifier stops working during use?

This may be due to the protection function. Check that there is no short circuit on the speaker wires, that the temperature is not too high, and that the speaker impedance is correct. If the problem persists, turn off the power and check the connections. Contact an authorized center if necessary.

What is the minimum speaker impedance I can use?

The load impedance is 4 Ω, with an acceptable range of 2 Ω to 8 Ω. For a bridged connection, the minimum impedance is 4 Ω. Do not go below 2 Ω to avoid damaging the amplifier.

Can I use both RCA and speaker inputs?

No, do not connect both RCA input and speaker input simultaneously. Use only one. If you use the speaker input, the INPUT SELECT switch is automatically set to 4CH.

How to activate the amplifier automatically?

If you connect the speaker input wires of the head unit, the amplifier turns on automatically when the head unit is turned on. If this does not work, use a system remote control wire (sold separately) connected to the remote terminal of the head unit.

What is the function of the BASS BOOST switch?

The BASS BOOST switch allows boosting the bass by 0 dB, 6 dB or 12 dB. It applies only to the output of channel B. Use with caution to avoid distortion.

How to install the amplifier in the vehicle?

Fix the amplifier on a flat and rigid surface using the provided self-tapping screws. Leave enough space for ventilation. Drill 2.5 mm diameter holes at the marked locations and screw in. Ensure no wires or important parts are damaged.

What to do in case of intermittent sound cut at high volume?

This may indicate an incorrect gain setting. Make sure the gain is not too high and the head unit volume is not at maximum. The protection function may cut the sound if the output is excessive or in case of overheating. Reduce the volume and check the settings.

USER MANUAL GMA4704 PIONEER

PIONEERELECTRONICSAUSTRALIAPTY.LTD.

5ArcoLane,Heatherton,Victoria,3202Australia TEL:[phone]

PIONEERELECTRONICSOCANADA,INC.

340FerrierStreet,Unit2,Markham,OntarioL3R2Z5,Canada
TEL:[phone]
TEL:[phone]

PIONEERELECTRONICSDEMEXICOS.A.deC.V.

Blvd.ManuelAvilaCamacho138,10piso
Col.LomasdeChapultepec,Mexico,D.F.11000
TEL:[phone]
FAX:[phone]

先锋股份有限公司

ThankyouforpurchasingthisPIONEER product

Toensureproperuse,pleasereadthroughthis manualbeforeusingthisproduct.Itisespeciallyimportantthatyoureadandobserve

WARNING sand CAUTION sithismanual.

Please keep themualinasafeandaccessible placeforfuturereference.

Ifyouwanttodisposethisproduct,donotmix itwithgeneralhouseholdwaste.Thereiseaseparatecollectionsystemforusedelectronic productsinaccordancedewithlegislationthatrequirespropertreatment,recoveryandrecyclc.

Privatehouseholdsinthememberstates of theEU,inSwitzerland and Norway may return theirusedelectronicproductsfreeofcharge todesignatedcollectionfacilitiesortoaretailer(ifyoupurchaseasimilarnewone).

For countriesnotmentionedabove,please contactyourlocalauthoritiesforthecorrect methodofdisposal.

Bydoingsoyouwillensurethatyourdispersed productundergoesthenecessarytreatment, recoveryandrecyclingandthuspreventpotentialnegativeeffectsontheenvironment

andhumanhealth.

Visitourwebsite

Visitusatthefollowingsite:

http://www.pioneer-car.co.uk

• Registryourproduct.Wewillkeepthedetailsofyourpurchasefiletohelpyou

refertothisinformationintheeventofan insuranceclaimsuchaslossorthoft.

Weofferthelatestinformationabout PIONEERCORPORATIONNonour website.

Ifyouexperienceproblems

Shouldthisproductfailtooperateproperly, pleasecontactyourdealerornearestauthorizedPioneerServiceStation.

Beforeconnecting/ installingtheamplifier

WARNING

Theuseofaspecialredbatteryandground wireRD-223,availableseparately,isrecommended.Connectthebatterywiredirectlyto thecarbatterypositiveterminal ④ andthe groundwiretothecarbody.
- This unit is for vehicles with a 12V battery and negative grounding. Before installing in recreational vehicles, trucks or buses, check the battery voltage.
- Wheninstallingthisunit,makesuretoconnectthegroundwirefirst.Ensurethatthe groundwireisproperlyconnectedtometal partsofthecar'sbody.Thegroundwireofthe oneofthisunitmustbeconnectedtothecar separatelywithdifferent screws.Ifthescrew forthegroundwireloosensorfallsout,it couldresultinfire,generationofsmokeormalfunction.
Alwaysuseafuseoftheratingprescribed. Theuseofanimproperfusecouldresultin overheatingandsmoke,damagetotheproductandjury,includingburns.
- Check the connection of the powersupply and speakersifthefuseoftheseparatelysold batterywireortheamplifierfuseblows.Determineandresolvethecause,thenreplacethefusewithandidenticalequivalent.
Alwaysinstalltheamplifieronaflatsurface. Donotinstalltheamplifieronasurfacethat isnotflatoronasurfacewithaprotrusion. Doingsocouldresultinmalfunction.
- Wheninstallingtheamplifier, donotallow partssuchasextrascrewstogetcaughtbetweenthemplifierandtheautomobile. Doingsocouldcausealfunction.
- Donotallowthisunittocomeintocontact withliquids,Electricalshockcouldresult. Also,damagetothisunit,smoke,andoverheatingcouldresultfromcontactwithliquids. Thesurfacesoftheamplifierandanyattached

speakersmayalsoheatupandcauseminor burns.

• Intheeventofanyabnormality, the power supplytotheamplifieriscutofftoprevent equipmentmalfunction. Ifthisoccurs, switch thesystempoweroffandcheckthepower supplyandspeakerconnections.Ifyouareunabledeterminetherecause, pleasecontact yourdealer.
• Always disconnect thenegative terminal of the battery before hand to avoid other risk of electricshockorshort circuit during installation.
• Donotattemptodisassembleormodifythis unit.Doingsomayresultinfire,electric shockorothermalfunction.

CAUTION

• Alwayskeep the volume lowened to hear outside sounds.
• Extendeduseofthecarstereowhiletheengineisatrestoridlingmayexhaustthebattery.
  This product is evaluated in moderate and tropical climate condition under the Audio, video and similare electronic apparatus-Safety requirements, IEC60065.
  Theographicalsymbol placedonthe productmeansdirectcurrent.

Abouttheprotectionfunction

Thisproducthasprotectionfunction.Whenthis productdetectssomethingabnormal,the followingfunctionswilloperatetoprotecttheproduct andspeakeroutput.

Thepowerindicatorwillturnoffandthemplifierwillshutdowninthesituationsoutlined below.

—Ifthespeakeroutputterminalandspeaker wireareshort-circuited.
—IfaDCvoltageisappliedtothespeaker outputterminal.

BeforeyoustartSettingtheunit

Theamplifierwillreducethepoweroutputif thetemperatureinsidetheamplifiergets high.lfthetemperaturegetstoohigh,the powerindicatorwillturnoff,andthemplifier willshutdown.

What'swhat

GM-A6704
Frontside

Rearside
GM-A4704

Frontside

Rearside

Toadjusttheswitch,useaflatheadscrewdri- verifneeded.

①HPFFREQ(cutofffrequency)control

Cutofffrequencyselectablefrom40Hzto 500 Hz if the HPF select switch is set to HPF.

• You can select cutoff frequency only for CHANNELA.

LPF(low-passfilter)/HPF(high-passfilter)selectswitch

Switchthesettingsbasedontheconnected speaker.

• Whenthe Subwooferisconnected:

Settingtheunit

SelectLPF.This eliminates highrange frequency and outputs low range frequency.

• Whenthefullrangespeakerisconnected: SelectHPForOFF.HPFeliminateslow rangefrequencyandoutputhighrange frequency.Offoutputstheentirefrequencyrange.

③ GAIN(gain)control

AdjustinggaincontrolsCHANNELA(channelA)andCHANNELB(channelB)helps alignthecarstereooutputtothePioneer amplifier.DefaultsettingistheNORMAL position. Iftheoutputremainslow,evenwhentecar stereovolumeisturnedup,turnthecontrolstoalowerlevel.lfdistortionoccurs whenthecarstereovolumeisturnedup, turnthesecontrolstoahigherlevel.

• Ifusingonlyoneinputplug,setthegain controlsforspeakeroutputsAandBto thesameposition.
• ForusewithanRCAequippedcarstereo (standardoutputof500mV),settothe NORMALposition.ForcewithanRCA equippedPioneercarstereo,with maximumoutputof4Vormore,adjustlevel to matchthatofthecarstereooutput.
• ForusewithanRCAequippedcarstereo withoutputof4V,settotheHIGHposition.

④INPUTSELECT(inputselect)switch

Select2CHfortwo-channelinputand4CH forfour-channelinput.

• YoucanselectinputselectonlyforconnectionswhenusingtheRCAinputjack. Forconnectionswhenusingthespeaker inputwire,4CHwillbeusedautomaticallynomatterwhichswitchsettingis selected.

⑤ BASSBOOST(bassboostlevelcontrol) switch

You can select tabassboostlevelfrom0dB, 6dBand12dB.

• Bassboostlevelsettingappliesonlyto CHANNELB channelB)output.

6Powerindicator

Thepowerindicatorlightsuptoindicate powerON.

Settingtheunit

Settinggainproperly

• Protectivefunctionincludedtoprevent malfunctionoftheunitand/orspeakers duetoexcessiveoutput,improperuseor improperconnection.
• When outputting high volumesoundetc., this function cut off the output for a few seconds as anormalfunction, but output is restored when the volume of the head unitisturned down.
• Acutinsoundoutputmayindicateimpropersettingofthegaincontrol.Toensure continuousoundoutputwiththehead unitatahighvolume,setamplifergain controtoalevelappropriateforthepreout maximumoutputleveloftheheadunit,so that volumecanremainunchangedandto controllexcessoutput.
• Despitecorrectvolumeandgainsettings, theunitsoundstillcutsoutperiodically. In suchcases, please contact the nearest authorized Pioneer Service Station.

Gaincontrolofthisunit

AboveillustrationsshowsNORMALgainsetting.

Relationshipbetweenamplifiergain andheadunitoutputpower

If amplifiergainisraisedimproperly, this will simply increase distortion, with little increase in power.

Signalwaveformwhenoutputting at highvolumeusingamplifiergain control

Ifthesignalwaveformisdistorteduetohigh output,eveniftheamplifiergainisraised,the outputpowerwillchangeonlyslightly.

Connectingtheunits

Connectiondiagram

①Specialredbatterywire RD-223(soldseparately) Aftercompletingallotheramplifierconnections,finallyconnectthebatterywireterminal ofthemaplifiertothepositive batteryterminal.
②Groundwire(Black) RD-223(soldseparately) Connecttometalbodyorchassis.
③ CarstereowithRCAoutputjacks(soldseparately)
Externaloutput Ifonlyoneinputplugisused.donotconnect anythingtoRCAinputjackB.
⑤ConnectingwirewithRCApinplugs(soldseparately)
⑥RCAinputjackA
⑦RCAinputjackB
(8)Speakerinputterminal(useaconnectorincluded)

Pleaseseethefollowingsectionforspeaker connectioninstructions.RefertoConnections whenusingthespeakerinputwire.

⑨ Speakeroutputterminals Pleaseseethefollowingsectionforspeaker connectioninstructions.RefertoConnecting thespeakers.
10Systemremotecontrolwire(soldseparately) Connectmaleterminalofthiswiretothesystemremotecontrolterminalofthecarstereo. Thefemaleterminalcanbeconnectedtothe auto-antennarelaycontrolterminal.lfthecar stereolacksystemremotecontrolterminal, connectthemaleterminaltothepowerterminaiviatheignitionswitch.
⑪Fuse25A×2(GM-A6704)/30A×1(GMA4704)
⑫Fuse(30A)×2
⑬Grommet
14Rearside
15Frontside

Note

INPUTSELECT(inputselect) switchmustbeset.
Fordetails,seeSettingtheunit.

Connectingtheunits

Beforeconnectingthe amplifier

WARNING

• Securethewiringwithcableclampsoradhesivetape.Toprotectthewiring,wrapsectionsincontactwithmetalpartsinadhesivetape.
• Nevercuttheinsulationofthepowersupply tofeedpowertootherequipment.Current capacityoftwewireislimited.

CAUTION

• Nevershortenanywires, the protection circuit may malfunction.
• Neverwirethespeakernegativecabledirectly toground.
• Neverbandtogethermultiplespeaker'snegativecables.
• Ifthesystemremotecontrolwireoftheamplifierisconnectedtothepowerterminalviathe ignitionswitch(12VDC),theamplifierwillremainonwiththeignitionwhethertecar stereoisonoroff,whichmayexhaustbattery iftheengineisatrestoridling.
  Installandroutetheseparatelysoldbattery wireasfaraspossiblefromthespeakerwires. Installandroutetheseparatelysoldbattery wire,groundwire,speakerwiresandthemplifiersfarawayaspossiblefromtheantenna,antennacableandtuner.

Aboutbridgedmode

Diagram A - Proper
4ΩBridgedMode

Diagram B - Improper
2Ω Bridged Mode

• Donotinstallorusethisamplifierbywiring speakersratedat4Ω(orlower)inparallelto achievea2Ω(orlower)bridgedmode(DiagramB).

Amplifierdamage,smoke,andoverheating couldresultfromimproperbridging.The amplifiersurfacecouldalsobecomehottothetouchandminorburnscouldresult. Toproprielyinstalloruseabridgedmodeand achievea4Ωload,wiretwo8Ωspeakersin parallelwithLeft+andRight-(DiagramA) oruseasingle4Ωspeaker. Inaddition,reftothespeakerinstruction manualforinformationonthecorrectconnectionprocedure.

• Forany further enquiries, contact your local authorized Pioneer dealer or customer service.

Connectingtheunits

Aboutsuitable specificationofspeaker

Ensurespeakersconformtothefollowing standards,otherwisethereisariskoffire, smokeordamage.Speakerimpedanceis2Ω to 8 Ω or 4 Ω to 8 Ω for two-channel and other bridgeconnections.

Subwoofer

SpeakerchannelPower
Four-channeloutput	Nominalinput: Min.60W(GM-A6704) Min.40W(GM-A4704)
Two-channeloutput	Nominalinput: Min.190W(GM-A6704) Min.130W(GM-A4704)
Three-channelSpeakeroutputA	Nominalinput: Min.60W(GM-A6704) Min.40W(GM-A4704)
Three-channelSpeakeroutputB	Nominalinput: Min.190W(GM-A6704) Min.130W(GM-A4704)

Otherthansubwoofer

SpeakerchannelPower
Four-channeloutput	Max-input: Min.170W(GM-A6704) Min.80W(GM-A4704)
Two-channeloutput	Max-input: Min.500W(GM-A6704) Min.260W(GM-A4704)
Three-channel SpeakeroutputA	Max-input: Min.170W(GM-A6704) Min.80W(GM-A4704)
Three-channel SpeakeroutputB	Max-input: Min.500W(GM-A6704) Min.260W(GM-A4704)

Connectingthespeakers

Thespeakeroutputmodecanbefour-channel, three-channel(stereoandmono)ortwo-channel(stereoormono).Connectthespeaker leadsbasedonthemodeandthefigures shownbelow.

Four-channeloutput

①Right
(2)Left
③SpeakeroutA
④SpeakeroutB

Connectingtheunits

Three-channeloutput

①Right
②Left
③SpeakeroutA
④SpeakeroutB(Mono)

Two-channeloutput(Stereo)

①Speaker(Right)
②Speaker(Left)

Two-channeloutput(Mono)

①Speaker(Mono)

Connectionswhenusing theRCAinputjack

ConnectthecarstereoRCAoutputjackand theRCAinputjackoftheamplifier.

Four-channel/Three-channeloutput

• SlideINPUTSELECT(inputselect) switch to4CHposition.

(4)

①RCAinputjackA
②RCAinputjackB
③ConnectingwireswithRCAplugs(soldseparately)
④Fromcarstereo(RCAoutput)

Connectingtheunits

Ifonlyoneinputplugisused.e.g. when the carstereohasonlyoneoutput(RCAoutput), connecttheplugtoRCAinputjackArather thanB.

Two-channeloutput(Stereo)/(Mono)

• SlideINPUTSELECT(inputselect) switch to2CHposition.

①RCAinputjackA

Fortwo-channeloutput,connecttheRCA plugstotheRCAinputjackA.

② Connecting wire with RCA pin plugs (sold separately)

③Fromcarstereo(RCAoutput)

Connectionswhenusing thespeakerinputwire

Connect the car stereospeaker output wires to the amplifier using the supplied speaker input wire.

• DonotconnectboththeRCAinputandthespeakerinputatthesametime.

①CarStereo
②Speakeroutput
③White/black:CHA,Left
White:CHA,Left
⑤Gray/black:CHA,Right
⑥Gray:CHA,Right
Green/black:CHB,Left
⑧Green:CHB,Left
⑨ Violet/black:CHB,Right
10Violet:CHB,Right
⑪Speakerinputconnector

Tospeakerinputterminalofthisunit.

Note

If speakerinputwiresfromheadunitareconnectedtothisamplifier, the amplifierwillautomaticallyturnonwhentheheadunitisturnedon. Whentheheadunitisturnedoff, the amplifier turnsoffautomatically.Thisfunctionmaynot workwithsomeheadunits.Insuchcases,make surethattheCHAftchannelisconnectedcorrectly.Ifthefunctionstilldoesnetwork, please useasystemremotecontrolwire(soldseparately).Ifmultipleamplifiersaretobecomnected togethersynchronously, connecttheheadunit andallamplifiersviathesystemremotecontrol wire.

Connectingtheunits

Connectingthepowerterminal

Theusefaspecialredbatteryandground wireRD-223(soldseparately)isrecommended.Connectthebatterywiredirectlyto thecarbatterypositiveterminal ④ andthe groundwiretothecarbody.

WARNING

If the battery wire is not securely fixed to the terminal using the terminals screws, there is a risk of overheating, malfunction and injury, including minor burns.

1Routebatterywirefromenginecompartmenttothevehicleinterior.

• Whendrillingacablepass-holeintothevehiclebodyandroutingabatterywirethoroughit, takecarenttoshort-circuitthe wiredamagingitbythecutedgesorburrs ofthehole.

Aftercompletingallotheramplifierconnections,finallyconnectthebatterywireterminal oftheamplifiertothepositive batteryterminal.

①Positive terminal
②Enginecompartment
③Vehicleinterior
④Fuse(30A)×2
⑤InserttheO-ringrubbergrommetintothe vehiclebody.
⑥ Drilla14mmholeintothevehiclebody.

2Twistthebatterywire,groundwire andsystemremotecontrolwire.

3Attachlugstowireends.

Usepliers,etc.,tocrimplugstowires.

①Lug(soldseparately)
② Batterywire
③Groundwire

4Connectthewirestotheterminal.

Fixthewiressecurelywiththeterminal screws.

①Systemremotecontrolterminal
②Groundterminal
③Powerterminal
④Terminalscrews
⑤Batterywire

Connectingtheunits

⑥Groundwire

⑦Systemremotecontrolwire

Connectingthespeaker outputterminals

1Usewirecuttersorautilityknifeto stripteendofthespeakerwirestoexposeabout10mmofwireandthentwistthewire.

2Attachlugstowireends.

Usepliers,etc.,tocrimplugstowires.

①Lug(soldseparately)

②Speakerwire

3Connectthespeakerwiresthespeakeroutputterminals.

Fixthespeakerwiressecurelywiththeterminalscrews.

①Terminalscrews
②Speakerwires
③Speakeroutputterminals

Installation

Beforeinstallingtheamplifier

WARNING

Toensureproperinstallation,usethesupplied partsinthemannerspecified.Ifanyparts otherthanthesesuppliedareused,theymay damageinternalpartsoftheamplifier,orbecome loosecausingtheamplifiertoshut down.
- Donotinstallin:

—Placeswhereitcould injurethedriveror passengersifthevehiclestopssuddenly.
—Placeswhereitmayinterferewiththedriver,suchasonthefloorinfrontofthedriver'sseat.

Installtappingscrewsinsuchawaythatthe screwtipdoesnn'touchanywire.Thisisimportanttopreventwiresfrombeingcutbyvibrationofthecar,whichcanresultinfire.
- Makesurethatwiresdonotgetcaughtinthe slidingmechanismoftheseseatsortouchthe legsofapersoninthevehicleassshort-circuit mayresult.
- Whendrillingtoinstalltheamplifier,always confirmnopartsarebehindthepaneland protectallcablesandimportantequipment (e.g.fuel/brakelines,wiring)fromdamage.

CAUTION

• Toensureproperheatdissipationoftheamplifier,ensurethefollowingduringinstallation: Allowadequatespaceabovetheamplifier forproperventilation. Donotcovertheamplifierwithafloormat orcarpet.
• Protectionfunctionmayactivatetoprotectthe amplifieragainstoverheatingduetoinstantioninlocationswheresufficienttheatcannot bedissipated,continuoususeunderhigh-volumeconditions,etc.Insuchcases,theamplifierreducesthepoweroutputshuts downuntilithascooledtoacertaindesignatedtemperature.

• Placeallcablesawayfromhotplaces, such asneartheheateroutlet.

• Theoptimalinstallationlocationdiffersdependingonthecarmodel.Securethempliferatasufficientlyrigidlocation.

• Checkallconnectionsandsystemsbefore finalinstallation.
  Afterinstallingtheamplifier, confirmthat the spare tire, jack and tools can beeasily removed.

Exampleofinstallationon thefloormatorchassis

1Placethemamplifierinthedesiredinstallationlocation.

Insertthesuppliedtappingscrews(4mm× 18mm)intothescrewwholesandpushonthe screwswithascrewdriversotheymakeanim-printwheretheinstallationholesaretobelocated.

2Drill2.5mm diameter holesattheimprintseitheronthecarpetordirectlyon thechassis.

3Installtheamplifierwiththeuseof suppliedtappingscrews(4mm×18mm).

①Tapping-screws(4mm×18mm)
②Drill2.5mm diameterhole
③Floormatorchassis
④Hole-to-holedistance:343mm(GM-A6704)/313mm(GM-A4704)
⑤Hole-to-holedistance:195mm

Additionalinformation

Specifications

GM-A6704

Powersource.14.4VDC(10.8Vto15.1V allowable)

Groundingsystem.Negativetype

Currentconsumption.31A(atcontinuouspower, 4Ω)

Averagecurrentconsumption 8.5A(4Ωfor four channels) 14A(4Ωfortwochannels)

Fuse. 25Ax2

Dimensions(W×H×D)...356mm×60mm×215mm

Weight. 2.2kg(Leadsforwiringnot included)

Maximumpoweroutput.....170Wx4(4Ω)/250Wx4 (2Ω)/1000WTOTAL (BRIDGE)

Continuouspoweroutput...60W×4(at14.4V,4Ω, 20Hzto20kHz≤1%T +N)

190W×2(at14.4V,4Ω BRIDGE1kHz,≤1%THD +N)

95W×4(at14.4V,2Ω, 1kHz,≤1%THD+N)

Load impedance 4Ω (2Ω to 8Ω allowable)

Frequencyresponse.10Hzto70kHz(+0dB, -3dB)

Signal-to-noiseratio. 95dB(IEC-Anetwork)

Distortion.0.05%10W,1kHz

Lowpassfilter:

(Ach) Cutofffrequency.80Hz Cutoffslope-12dB/oc

(Bch) Cutofffrequency.80Hz Cutoffslope-12dB/oc

Highpassfilter:

(Ach) Cutofffrequency.40Hzto500Hz Cutoffslope-12dB/oc

(Bch) Cutofffrequency.80Hz Cutoffslope-12dB/oc

Bassboost: Frequency. .50Hz Level. 0dB/6dB/12dB

Gaincontrol:
RCA.0.3Mto6.5V
Speaker.3.0Mto26V

Maximuminputlevel/impedance: RCA. 6.5V/22kΩ Speaker. 26V/16kΩ

GM-A4704

Powersource.14.4VDC(10.8Vto15.1V allowable)

Groundingsystem.. Negativetype

Currentconsumption.20.5A(atcontinuouspower, 4Ω)

Averagecurrentconsumption 5.5A(4Ωfor four channels) 8.5A(4Ωfortwochannels)

Fuse. 30A×1

Weight. 2.0kg(Leadsforwiringnot included)

Maximumpoweroutput.....80Wx4(4Ω)/130Wx4 (2Ω)/520WTOTAL (BRIDGE)

Continuouspoweroutput...40W×4(at14,4V,4Ω, 20Hzto20kHz≤1%THD

+N) 130W×2(at14.4V,4Ω BRIDGE1kHz,≤1%THD +N)

65W×4(at14.4V,2Ω, 1kHz,≤1%THD+N)

Load impedance 4Ω (2Ω to 8Ω allowable)

Frequencyresponse.10Hzto70Hz(+0dB, -3dB)

Signal-to-noiseratio.94dB(IEC-Anetwork) Distortion.0.05%(10W,1kHz)

Lowpassfilter:

(Ach) Cutofffrequency.80Hz Cutoffslope-12dB/oc

(Bch) Cutofffrequency.80Hz Cutoffslope-12dB/oc

Highpassfilter:
(Ach)
Cutofffrequency.40Hzto500Hz
Cutoffslope.12dB/oc

(Bch) Cutofffrequency.80Hz Cutoffslope-12dB/oc

Gaincontrol:
RCA. 0.3Vto6.5V
Speaker. 3.0Vto26V

Maximuminputlevel/impedance: RCA. 6.5V/22kΩ Speaker. 26V/16kΩ

Notes

• Specificationsandthedesignaresubjectto modificationswithoutnotice.

Theaveragecurrentconsumptionisnearly themaximumcurrentconsumptionbythis unitwhenanaudiosignalinput.Usethis valuewhenworkingouttotalcurrentconsumptionbymultiplepoweramplifiers.

Avantdecommencer

Pentedecoupure.....12dB/octave

(CanalB)

Frequencedecoupure 80Hz

Pentedecoupure.....12dB/octave

Filtrepasse-haut:

(CanalA)

Frequencedecoupure 40Hzà500Hz

Pentedecoupure.....-12dB/octave

(CanalB)

Frequencedecoupure 80Hz

Pentedecoupure.....12dB/octave

Accentuationdesgraves:

Fréquence. 50Hz

Niveau. 0dB/6dB/12dB

Commandedegain:

RCA. 0,3V6,5V

Pentedecoupure.....12dB/octave

(CanalB)

Frequencedecoupure 80Hz

Pentedecoupure.....-12dB/octave

Filtrepasse-haut:

(CanalA)

Fréquencedecoupure

40Hzà500Hz

Pentedecoupure.....-12dB/octave

(CanalB)

Fréquencedecoupure

80Hz

Pentedecoupure.....-12dB/octave

Commandedegain:

RCA. 0,3V6,5V