GPX750.1D - Receiver Crunch - Free user manual and instructions

USER MANUAL GPX750.1D Crunch

- This device is only suited for a 12 volt system with negative ground. - Theradiatedheatwhileoperationrequiressufcientaircirculationattheplaceofinstallation.Itis veryimportantthattheheatsinknsdonothavecontactwithanymetalpartsoranysurfaceswhich couldimpairaircirculation.Theampliermaynotbeinstalledinsmallclosedlocationorspaces without air circulation (e.g. spare wheel recess or below the vehicle carpeting). We recommend the installationinthevehicle’strunk.Ensuresufcientprotectionagainstvibrations,dustanddirt. - Ensurethattheinputandoutputcablesaresufcientlyseparatedfromthepowersupplycables. Otherwise interferences may occur. - Ensure the accessibility of the fuse and the operating elements after installation. - Thereliabilityandperformanceoftheamplierdependsonthequalityofinstallation.Preferably consult an expert to install the system, particularly if you want to install several loudspeakers.

POWER SUPPLY AND TURN-ON-CONNECTION

ATTENTION: Before you start with the installation, disconnect the ground connection from the ve- hicle’s battery in order to prevent short circuits. Thepowerwiringwhichisusuallyinstalledinon-boardcarnetworksisnotsufcientforapoweramplier‘sde- mands.MakesurethatthepowerwirestoGNDandtothe+12Vterminalhasbeensufcientlyspecied.Asuf- cientcablecrosssection(seepage31,g.6)mustbeusedtoconnectthebatterytotheamplier‘sterminals. FirstconnecttheGNDterminaloftheampliertoanappropriategroundconnectionatthechassis.Toensurea good connection, residue dirt and dust from the connection point. A loose connection may cause malfunctions or interferences noise and distortion. Thenconnectthe+12Vterminaloftheamplierwiththebatterybyusinganappropriatecable(seepage31, g.6)includinganin-linefuse.Thisfuseshouldbelocatedveryclosetothebattery;forsafetyreasonsnot more than 30 cm away. Thenconnecttheremoteturn-on-wirefromtheheadunitwiththeamplier‘sREMterminal.Acablewitha cross-section of 0.5 mm

is adequate. LOUDSPEAKER CONNECTION - The total impedance must not be lower than 1 ohm. - Never connect loudspeaker cables with the ground of the chassis or the +12 V supply voltage. Iftheamplierisoperatedwithatoolowimpedanceorincorrectlyused,theentiresoundsystemmaybedam- aged. This means a warranty void in such cases.

When installing the audio cables between the RCA outputs of the head unit and the RCA inputs of the ampli- er(Fig.1,8),theaudioandpowersupplycablesshould,ifpossible,notberoutedalongthesamesideofthe vehicle. We recommend a separated installation, e.g. routing the power cable through the cable channel on the left side and the audio cables through the cable channel of the vehicle on the right side or vice versa. This prevents interferences due to crosstalk into the audio signal.10 INPUT SENSITIVITY TurntheLEVELINPUT(Fig.1,7)controlleroftheampliertotheMINposition.Thenturnthevolumecontroller of the head unit to 80 - 90% of its full setting. Now turn LEVEL INPUT clockwise until you hear some distortion. Then turn back the LEVEL INPUT slightly until you hear a cleaner sound.

By using the BASS BOOST controller (Fig. 1,3) you are able to increase the bass enhancement from 0 to 12 dB. ATTENTION: Use the BASS BOOST wisely!

HIGH LEVEL INPUTS & AUTO TURN ON

The high level inputs under HI LEVEL INPUT (Fig. 5) are suitable to connect the device input with speaker wires,ifyourheadunitisnotequippedwithpre-amplierRCAoutputs.Extendthereforeveryregardingspeak- er cable from your head unit with appropriate speaker cables from your car audio retailer to the mounting locationoftheamplier.ThenconnecttheeachmatchingloudspeakercablewiththecablesoftheincludedHI LEVEL INPUT connector. CAUTION: Never use the high level inputs and the RCA inputs at the same time. This may damage the device seriously. Theamplierdetectsavoltagerise(6Volts)withasocalled”DCOffset”overtheconnectedinputsignalonthe highlevelinputsunderHILEVELINPUT(Fig.5)whentheheadunitwillbeswitchedon.Hence,theamplier willalsobeturnedon.Assoonastheheadunitwillbeturnedoff,theamplierturnsalsoautomaticallyoff.In this case the turn-on connection REM (Fig. 2,2) is not needed. NOTE: The Auto Turn On function usually works with 90% of all head units, because they are equipped with ”High Power”-outputs. Only with a few older and head units the Auto Turn On function is not working.

VARIABLE SUBSONIC FILTER

WiththeSUBSONICcontroller(Fig.1,5)youcanadjustthelowercrossoverfrequency,toltertheverylow frequencies to relieve the subwoofer or to generate a bandpass signal. If you don’t want to use this function, turn the controller (Fig. 1,5) to the very left to the 10 Hz position.

VARIABLE LOW PASS FILTER

Set the desired crossover frequency by using the controller LOW PASS (Fig. 1,4). Thus to that only the fre- quenciesbelowthechosencrossoverfrequencywillbeampliedandthesubwooferplaysmorepreciselyand efcient.

BASS LEVEL REMOTE CONTROLLER

With the included bass level cable remote controller you are able to adjust the bass level e.g. out of the driver’s seat. Connect the remote controller and the REMOTE connector (Fig. 1,2) with the enclosed cable.

PHASE SHIFT CONTROLLER

The PHASE SHIFT controller (Fig. 1,6) allows to adjust the phase between 0° and 180° to match the output signal with the vehicle’s interior acoustic.11 PROTECTION CIRCUIT ThePOWER/PROTECTIONLED(Fig.1,1)lightsupgreen,iftheamplierisinoperation. ThePOWER/PROTECTIONLED(Fig.1,1)lightsupred,whentheamplierisoverheated,orashortcircuit occurs respective a too low impedance load is connected to the speaker outputs. If this events, the internal built-inprotectioncircuitshutsdowntheamplierautomatically.Theampliershouldworkagainproperlyafter you have solved the problems. CONNECTIONS AND CONTROLLERS (FIG. 1) (1) Power-/Protection-LED (2) Connector for the included bass level remote controller (3) LOW PASS controller (4) BASS BOOST controller (5) SUB SONIC controller (6) PHASE SHIFT controller (7) LEVEL INPUT controller

POWER SUPPLY AND TURN ON CONNECTION (FIG. 2) (1) GND terminal for the ground (2) REM terminal for the turn on connection (3) +12 V terminal for the positive-connection of the battery (4) Vehicle’s battery (5) Inline Fuse (not included in the scope of delivery) (6) Turn on wire from the head unit or the electrical antenna (7) Fuses 1-CHANNEL OPERATION MONO / 2 x SUBWOOFERS (FIG. 4) Ifyouwanttoruntheamplierwiththe2lineoutputchannelsfromtheheadunittodrivetwosubwoofers,con- nect the following setup: (1) Bass level remote controller (2) To the head unit, line output rear left or subwoofer output (3) To the head unit, line output rear right or subwoofer output (4)Subwoofer1(2-8Ω) (5) Subwoofer2(2-8Ω) 1-CHANNEL OPERATION MONO / 1 x SUBWOOFER (FIG. 3) Ifyouwanttoruntheamplierwiththe2lineoutputchannelsfromtheheadunittodriveasubwoofer,connect the following setup: (1) Bass level remote controller (2) To the head unit, line output left or subwoofer output (3) To the head unit, line output right or subwoofer output (4)Subwoofer(1-8Ω) IMPORTANT! Always observe the correct polarity of all connections!

FIGURES (P. 28-31)12

TROUBLESHOOTING If you are having problems after installation follow the Troubleshooting procedures below. Procedure 1: CheckAmplierforproperconnections. Verify that POWER/PROTECTION LED lights up green. If this is the case, skip to Step 3, if not continue.

1. Check in-line fuse on battery positive cable. Replace if necessary.

2.Checkfuse(s)onamplier.Replaceifnecessary.

3. Verify that Ground connection is connected to clean metal on the vehicle’s chassis. Repair/replace if necessary.

4. Verify there is 9 to 16 Volts present at the positive battery and remote turn-on cable. Verify quality connections for both cables at amplier,stereo,andbattery/fuseholder.Repair/replaceifnecessary. Procedure 2: POWER/PROTECTION LED lights up red. 1. If the PROTECT lights up red, this is a sign of a possible short in the speaker connections. Check for proper speaker connections and use an ohm meter to check for possible shorts in the speaker wiring. Too low speaker impedance may also cause PROTECTION tolight.Thiscanalsobeasignofdrivingtheamplieratveryhighpowergainswithoutadequateairowaroundtheamplier.Shut offthesystemandallowampliertocool.Checkthatthevehiclechargingsystemismaintainingpropervoltage.Ifthepreviousitems donotsolvetheproblem,afaultmaybeintheamplier.Inthiscaseyoushouldcontactyourdealer. Procedure 3: CheckAmplierforaudiooutput. 1.VerifygoodRCAinputconnectionsatstereoandamplier.Checkentirelengthofcablesforkinks,splices,etc. Test RCA inputs for AC volts with stereo on. Repair/replace if necessary. Procedure 4: CheckAmplierforapoppingnoisewhileturningon. 1.Disconnectinputsignaltoamplierandturnamplieronandoff. 2.Ifthenoiseiseliminated,connecttheremoteleadofampliertosourceunitwithadelayturn-onmodule. Procedure 5: CheckAmplierifyouexperienceexcessEngineNoise.

1. Route all signal carrying wires (RCA, speaker cables) away from power and ground wires.

3. Remove existing ground wires for all electrical components. Reground wires to different locations.

Verify that grounding location is clean, shiny metal free of paint, rust etc.

4. Add secondary ground cable from negative battery terminal to the chassis metal or engine block of vehicle.

Cable length in meters