JBL GTO 75.4 Service Manual

Contents

JBL GTO 75.4 Service Manual Manual pdf 4 page image

INSTALLATIONWARNING: Playing loud music in anautomobile can hinder your ability to heartraffic and permanently damage yourhearing. We recommend listening at low ormoderate levels while driving your car. JBLaccepts no liability for hearing loss, bodilyinjury or property damage resulting fromthe use or misuse of this product.IMPORTANT: To get the bestperformance from your JBL Grand Touring ®Series amplifiers, we strongly recommendthat installation be entrusted to a qualifiedprofessional. Although these instructionsexplain how to install GTO amplifiers in ageneral sense, they do not show specificinstallation methods that may be requiredfor your particular vehicle. If you do nothave the necessary tools or experience,do not attempt the installation yourself.Instead, please ask your authorized JBLcar audio dealer about professionalinstallation.INSTALLATIONWARNINGS AND TIPS• Always wear protective eyewear whenusing tools.• Turn off the audio system and otherelectrical devices before you start.Disconnect the (–) negative lead fromyour vehicle’s battery.• Check clearances on both sides ofa planned mounting surface beforedrilling any holes or installing anyscrews. Remember that the screwscan extend behind the surface.• At the installation sites, locate andmake a note of all fuel lines, hydraulicbrake lines, vacuum lines and electricalwiring. Use extreme caution when cut-ting or drilling in and around these areas.• Before drilling or cutting holes, use autility knife to remove unwanted fabricor vinyl to keep material from snaggingin a drill bit.• When routing cables, keep input-signalcables away from power cables andspeaker wires.• When making connections, makecertain they are secure and properlyinsulated.• If the amplifier’s fuse must be replaced,use only the same type and rating asthat of the original. Do not substituteanother kind.CHOOSING A LOCATIONAND MOUNTING THEAMPLIFIERChoose a mounting location in the trunkor cargo area where the amplifier will notbe damaged by shifting cargo. Amplifiercooling is essential for proper amplifieroperation. If the amplifier is to be installedin an enclosed space, make sure there issufficient air circulation for the amplifierto cool itself.When mounting the amplifier under aseat, ensure that it is clear of all movingseat parts and does not affect the seatadjustments. Mount the amplifier so itis not damaged by the feet of backseatpassengers. Make sure that the amplifieris mounted securely using nuts and boltsor the supplied mounting screws.Mount the amplifier so that it remainsdry – never mount an amplifier outsidethe vehicle or in the engine compartment.POWER CONNECTIONSThe GTO amplifiers are capable ofdelivering extremely high power levels,and require a heavy-duty and reliableconnection to the vehicle’s electrical systemin order to perform optimally. See Figure 1for connection location. Please adhere tothe following instructions carefully:Ground ConnectionConnect the amplifier’s Ground (GND)terminal to a solid point on the vehicle’smetal chassis, as close to the amplifieras possible. Refer to the chart below todetermine minimum wire-gauge size. Scrapeaway any paint from this location; use a star-type lock washer to secure the connection.Power ConnectionConnect a wire (see chart at right forappropriate gauge) directly to the vehicle’spositive battery terminal, and install anappropriate fuse holder within 18" of thebattery terminal. Do not install the fuse atthis time. Route the wire to the amplifier’slocation, and connect it to the amplifier’sPositive (+12V) terminal. Be sure to useappropriate grommets whenever routingwires through the firewall or other sheetmetal. Failure to adequately protect thepositive wire from potential damage mayresult in a vehicle fire. When you are donerouting and connecting this wire, you mayinstall the fuse at the battery.Remote ConnectionConnect the amplifier’s Remote (REM)terminal to the source unit’s Remote Turn-On lead using a minimum of 18-gauge wire.NOTE: When using the speaker levelinputs, connect the remote (REM) terminalto the source unit. If your source unit doesnot have a remote turn-on connection,connect the amplifier’s (REM) terminal tothe vehicle’s accessory circuit.Speaker ConnectionsRefer to the application guides on thepages that follow. Speaker connectionsshould be made using a minimum of16-gauge wire.High-Level Input ConnectionsThe GTO75.4 and GTO75.4IIamplifiers are equipped with speaker-levelinputs that allow you to add an amplifierto head units that do not have RCA lineoutputs. The speaker outputs for thesource unit should be connected to theamplifier using the supplied connector(square four-wire plug). Remember tocheck for proper polarity. The GTO301.1,GTO601.1 and GTO1201.1 amplifiers arenot equipped with high-level inputs.NOTE: When using the high-level inputs,the AUX outputs can be used to pass aline-level signal to another amplifier.Wire Gauge ChartAmplifier Maximum MinimumModel Current Draw Wire GaugeGTO75.4 85A #8 AWGGAWGAWGThese recommendations assume 7' – 10'wire runs. If your installation differs mark-edly, you will need to adjust the wiregauge accordingly.IMPORTANT NOTE: If you are planningto use optional neon tubes, install thembefore making any electrical connectionsto the amplifier (refer to“Installing NeonTubes” on page 5).Figure 1. Terminal connection end plate.4 PM Page 2GTO 75.4/75.4II3