JBL GTH400-20107 Car Amplifier User Manual
Contents
1. 4 Channel Input Fading Subwoofer Front ue when Group1 Group2 Group3 4 channel output input Mode L L LAR L is available ___ i Group 2 Input GR2 pa Group 3 Input GR3 Speaker Crossover High Pass High Pass Low Pass od Preamp Output Crossover 2 Channel Input Mono Subwoofer li a E Group 1 Group2 Group3 Input Mode L L L R Group 2 Input GR 2 Group 3 Input GR 1 2 Speaker Crossover High Pass High Pass Low Pass Preamp Crossover 3 Note Image Enhancement cannot be used in these applications L R Z Main Speakers Subwoofer GTH400 20107 06 03 98 15 49 Side 9 p 4 Installation and Use 4 1 Controls and Connectors 1 Preamp Level Input Connector Use these connectors for line pre amp level inputs to the amplifier 2 Preamp Level Output Connector Use these outputs to send signal to additional amplifiers 3 Speaker Level Input Connector Use this connector for speaker level input signals A wire harness is supplied for use with this connector See Audio Input Connections section page 23 for wiring instructions This input also includes BL s Common Sense input circuitry which turns the amplifier on as soon as the high powered head unit connected to this input is turned on 4 Speaker Output Connectors Connect speaker wiring to these connectors See wiring directions for more information 5 6 7 8 Power Connector C2. Power Ground Chassis Ground Speakers Speakers Amplifier Speaker Output Connection Speakers A 15 GTH400 20107 06 03 98 15 49 Side 16 is heat and oil resistant whenever insulated crimp on connector or running wires through the engine secure set screw type terminal compartment All wire to wire blocks Never leave bare wire connections should be soldered and exposed Terminate wires with crimp insulated with heat shrink tubing or or solder on lug terminals whenever connected through a high guality appropriate Simultaneous Stereo Mono Connection Diagrams A Satellite Subwoofer Subwoofer Low Pass O High Pass Satellite Crossover Frequency 100Hz Tweeter Midrange Satellites C 300uF capacitor Left High ieee Right 100V non polorized Subwoofer Lowpass 0 L O Crossover Frequency 100Hz Cc e L 6 2mH air core inductor GTH400 e And ananan an gt sal SS i O a Le LUNE LEVELINPUTS PREAMP OUTPUTS iz S te a ae ep al S Y Y E Fo aupa a OOO HII OO a o oo P roo ne LalaJa OP You may change the subwoofer satellite crossover frequency by us
3. J MODULE Standard lt Large systems with rear speakers You should begin to hear an increase in reverberation and get a feeling of being in a very large auditorium Note The GTH400 converts the rear channels into true rear fill surround channels which cancel all center information vocals lead instruments etc and lets only true ambience information come out This same process is used in more expensive Surround Sound systems used in theaters Adjust the front and rear ambience as desired For optimum center imaging it is recommended that ambience be used sparingly on the front channels To bypass the effects of the Imaging Enhancer in the GTH400 simply pull on the Front Ambience knob until it clicks to the Bypass position The Enhancer On LED on the remote control panel will turn off and your sound system should revert back to normal stereo sound without ambience enhancement The Imaging Enhancer is also bypassed when the remote control is unplugged from the amplifier Slowly turn the Front Ambience knob in the clockwise direction to increase ambience You should begin to hear slight reverberation in the music and a sense of a widening front sound stage in both the Driver and All modes 7 Slowly turn the Rear Ambience knob in the clockwise direction to increase rear ambience only in 6 Important C
4. 16 to use in conjunction with a high pass filtered input signal to create a bandpass crossover for a midrange or midbass driver Set the switch to H high to activate the high pass filter for use with satellite speakers or tweeters on an amplifier group Mode Switches These switches are used to set the input mode for both preamp and speaker level inputs Set the switch to ST ereo for normal operation on the group using individual left and right inputs Set this switch to L to drive both the left and right outputs with only a single input on the left jack Set the switch to L R to sum the left and right inputs for a mono output on the group These switches do not affect the preamp outputs Bass EQ Switch These switches activate a built in Bass Boost circuit used to increase low bass output on the selected group These switches do not effect the preamp outputs Group 2 Input Switch This switch is used to select which inputs will drive Group 2 of the amplifier Put the switch in position GR 1 to allow Group 2 to be driven by the Group 1 inputs Put the switch in the GR 2 position to drive Group 2 with the Group 2 inputs Group 3 Input Switch This switch is used to select which inputs will drive Group 3 of the amplifier Put the switch in position GR 3 to allow Group 3 to be driven by the Group 3 inputs Put the switch in the GR 2 position to drive Group 3 with the Group 2 inputs Put this swit
5. PS IA ee ae HOLMS SGOW 185 Dr Dz D TDT ogo Qz222 ta weibelg 49019 OOPHLD 554 S 4 cun LD eyo cun Lu9 11 GTH400 20107 06 03 98 15 49 Side 12 4 2 Internal Adjustments Speaker Level Input Impedance Adjustments The speaker level inputs of the GTH400 come factory set with 100k ohm input impedance This will provide the lowest distortion operation from the speaker outputs of most modern head units by reducing the power the amplifier in the head unit must deliver to practically nothing On some older or lower priced head units this load will not facilitate proper fader operation To allow for this we have provided the ability to change the input impedance of the speaker level inputs to 15 ohms This is accomplished by moving the jumpers JUMPER SELECTOR ELECT 100K OR 15 OHMS A shown on the diagram above This in put is also capable of directly accepting signals when in the 100k ohm setting from many Balanced Line Drivers such as those sometimes used in competi tion vehicles For best results a Balanced Line Driver capable of at least 4V nominal output should be used If the head unit has 4 channels of built in amplification and or an electronic fader control you should leave the jumpers in the factory set position If the head unit has 2 channels of amplification with a speaker level fader the jumpers should be set to the 15 ohm position This will always bea r
6. GTH400 20107 06 03 98 15 49 Side a p 1 1 Features 1 2 About Installation Theory of Operation Although the GTH400 is designed to Virtual Center Image Enhancer make installation as easy as possible it J BL s breakthrough Virtual Center is an extremely sophisticated product circuitry is the result of the that requires proper installation and understanding of how the human ear setup to realize its full performance responds to timing frequency and potential If you feel you do not have amplitude cues to determine the the necessary knowledge and skills we apparent direction of a sound source strongly recommend that the Virtual Center circuitry manipulates the installation be done by your analog signal in real time to provide authorized J BL dealer each of the driver s ears with the signal If you choose to install the GTH400 they would receive if the driver was yourself read all of the information in seated in the center of the vehicle This this manual before you start the provides a stable centered image to installation Pay particular attention to the driver much like that obtained with the safety precautions and notes a dedicated center channel loudspeaker To restore the spaciousness that is generally lost in the small confines of a car interior the rear channels utilize differential mode ambience recovery to restore the ambience information pres ent in all conventional stereo recordings Unlike DSP the J BL circ
7. Input Minimum Speaker Impedance Single Ended Non Bridged Bridged Built in Electronic Crossover Frequency and Slope Bass Boost Frequency and Magnitude GTH400 35 Watts x 4 70 Watts x 2 4 ohms 0 05 THD 50 Watts x 4 100 Watts x 2 2 ohms 0 08 THD 100 Watts x 2 Bridged 4 ohms 0 08 THD 70 Watts x 2 4 ohms 0 05 THD 100 Watts x 2 Bridged 4 ohms 0 08 THD 200 Watts x 1 Bridged 4 ohms at 0 08 THD 100dBA 10Hz 50kHz 0 1dB 20Hz 20kHz 0 0 1dB gt 200 gt 100mV 4V RMS 10k ohms 15 ohm or 100k ohm Selectable by Internal J umpers 200mV 8V RMS 4V in for 4V out 4V in for 2V out 2 ohms 4 ohms 18dB per Octave Low Pass Filter Frequency Chips Available from 50 5kHz Factory Setting 80Hz 18dB per Octave High Pass Filter Frequency Chips Available from 50 5kHz 4dB at 40Hz 23 GTH400 20107 06 03 98 15 50 Side 24 b Power Reguirement 11 to 16V DC Negative Ground Fuse Size 30 Amp ATC Type Fuse 2 per Amplifier Size L x W x H 15 1 4 x 11 1 4 x 2 387mm x 286mm x 51mm Weight 13 lbs 4 oz 6 kg Speaker Level Input Molex Mini Fit J r Mating Connector 39 01 2080 Metal Pins 39 00 0038 Remote Control Drilling Template 24 GTH400 20107 06 03 98 15 50 Side 25 Staple or clip your original bill of sale here W 25
8. checking for continuity between the chassis ground point and battery ground Bass output from speakers too low Speaker wired out of phase check for proper polarity on all speaker wiring amp terminal to speaker terminal and amp terminal to speaker terminal Amplifier Power Light is on and Verify that the remote control is not set sound is heard from the front and rear in BYPASS mode by checking to see channels but the Imaging is not improved that the ON LED is lit with the image enhancer on Using the system configuration diagram confirm that the audio connections are correct for signal path and polarity Note that right hand drive car installations must have the Left and Right input and output connections reversed as shown in the wiring section on page 19 Perform the adjustments as directed in the Imaging Enhancer Setup section Power light is blinking and Incorrectly connected or shorted speaker no sound is heard wires check for shorts in wiring Defective GTH400 if there is no short on the speaker outputs the GTH400 may be broken Consult your BL dealer 22 GTH400 20107 06 03 98 15 50 Side 23 p 8 Specifications Signal to Noise Ratio Frequency Response Damping Factor Slew Factor Line Level Input Sensitivity For Rated Power Line Level Input Impedance Speaker Level Input Impedance Speaker Level Input Sensitivity Preamp Output Sensitivity Preamp Input Speaker
9. 2 Group 3 LIIR Pt LIIR Mode Stereo Stereo L R Group 2 Input GR2 Group 3 Input GR 1 2 Speaker Crossover High Pass High Pass Low Pass Preamp Crossover GTH400 GR GR2 GR3 L L L f L L R R R R R r q L R fL ZR Front Speakers Rear Speakers Subwoofer L satelite Speakers mi GTH400 20107 06 03 98 15 49 Side s p Application 3 4 Channel Full Range or Bi Amplified SE L R LR reamp or 4 Channel Full Range Front Speaker Level Rear Group1 Group2 Group 3 L Lt p Input Mode L L Stereo GR GR GR3 Group 2 Input GR2 Group 3 Input GR 3 a eee cael Speaker Crossover Flat Flat Flat Preamp Output Crossover GTH400 4 Channel Bi Amplified with cat a Fading Mono Subwoofers Er 4 N Group 1 Group2 Group3 Input Mode L L L4R Group 2 Input GR2 Group 3 Input GR3 Speaker Crossover High Pass High Pass Low Pass Preamp Crossover Stereo subwoofers may also be used by selecting ST L R L R on the group 3 input mode switch Front Speakers Rear Speakers or Subwoofer Note Image Enhancement cannot be used in these applications Application 4 3 Channel Bi Amplified
10. Dealer Name City State Zip Sales Receipt Number Date of Purchase GTH400 20107 06 03 98 15 49 Side 3 G 1 Introduction Thanks for purchasing your new GT series automotive multichannel ampli fier Your GT series amplifier will easily connect to virtually any car audio system whether it is factory installed or one purchased separately The GTH400 includes an abundance of unique features which are described in this manual The most obvious feature of the GTH400 is its 6 channel staggered power design This design provides the simplicity of driving an entire system with a single amplifier without compromise The flexible design of the GTH400 s built in crossover circuitry also allows elaborate systems to be built more simply than with conventional components For optimum performance the power amplifier circuitry is a fully discrete design notable for its low distortion and unusually clean and clear sound quality In addition to conventional preamp level inputs the GTH400 features BL s Universal Interface design which facilitates simple connection to factory radios with the low distortion that is usually only associated with preamp level connection In addition when using a high powered BTL radio through the speaker level inputs Common Sense turn on circuitry senses the common mode voltage present on the radio s speaker wires turning the amplifier on without an additional remote wire
11. GTH400 20107 06 03 98 15 49 Side 26 p GTH400 20107 06 03 98 15 49 Side 1 p GTH400 20107 06 03 98 15 49 Side 2 p Table of Contents e e e e o PE YY e e 3 Lid MES ai re anar a al ya aa a a aa 4 1 2 About Install isis aa dens sedans lanma duya 4 2 Installation ANG USC usd it aaaea 5 3 SystemDesignwiththeGTH400 6 3 1 SpeakerREg ireMEn S crio ia yazdy alama msi 6 3 2 Typical APPlicatio nS varices 7 4 Imstallati nand Usas tiara lata dada 9 4 1 Controls and COMNeCtOlS iaiia rra 9 42intermalAdijiustmenis 12 Speaker Level Input Impedance Adjustments 12 CrossoverFreguencyAdjustments 12 Custom Chip CONStrUCtON sasi ad da kanamada a sallana ada ty 13 RemoteChassisinstallation 13 Unter DashRemotelnstallation 14 In Dashremotelnstallation 14 PowerSupplyConnections 14 Simultaneous Speaker Stereo Mono Connection Diagram 16 Speaker Level Input Harness ColorCodes 17 5 Adjusting the GIN ornato 17 6 lmporantCharacteristics 19 Tli CASS OF Dificultad 21 8 Specifications miccional 23 Owner s Warranty Information Model Number Serial Number
12. an damage loudspeakers Reduce the level just to the point where the distortion goes away This is the maximum undistorted output level of your head unit and signal processors and should not be exceeded during use If audible distortion does not occur continue to increase the level until the head unit is turned all the way up If this setting does not provide adequate volume levels gradually increase turn clockwise the gain control for the main usually front speaker groups on the GTH400 until the system plays as loud as necessary or when the first signs of distortion are heard e After adjusting the main speaker s gain control you may then turn down the head unit s volume control to a comfortable level and adjust the remaining channels for the desired system balance You will find this easiest to do by adjusting the channels in the following order 1 front speaker Group 2 rear speaker Group 3 subwoofer speaker Group Elaborate systems incorporating tri or quad amplification can be complex to adjust Your local authorized J BL installation specialist is the best person to help with such adjustment Imaging Enhancer Setup After the installation and set up is finished and all wiring is checked proceed with the next few steps to set up the Imaging Enhancer on the GTH400 Note Since the Imaging Enhancer in the GTH400 is primarily designed to optimize the sound stage for the driver all tests should be performed
13. ch in the GR 1 2 position to drive Group 3 with the sum of Group 1 and 2 fora non fading subwoofer output on Group 3 17 Remote Bypass On Indicator This indicator is on when the Imaging Enhancer is engaged and off when the Imaging Enhancer is bypassed 18 Driver All Optimizer Indicator This indicator is on when the Virtual C enter Channel circuitry is in Driver opti mization mode and off when it is in the All passenger mode Note The enhancer on indicator must be on before driver s mode can enabled 19 Front Ambience Control and On Bypass Switch Rotating this control adjusts the amount of ambience and front staging width produced by the Imaging Enhancer Pulling the knob places the Imaging Enhancer in Bypass mode Pushing in the knob places the Imaging Enhancer in On mode 20 Rear Ambience and Driver All Optimizer Control Rotating this knob controls the amount of rear fill ambience and the room size of the acoustic environment when used in a system with rear speakers Pulling the knob out places the Imaging Enhancer in All passengers opti mization mode Pushing the knob in places the unit in Driver optimizati on mode Best results at the driver s position will be achieved with the control in the Driver setting Power Indicator LED on amp chassis top LED steadily illuminates for normal operation LED blinks when protection circuitry or mu
14. ed to the frame of the speaker or to the chassis of the vehicle NEVERAMourt Upeic GTH400 20107 06 03 98 15 49 Side 7 G 3 2 Typical Applications The diagrams on pages 8 amp 9 show the most common basic system configurations of the GTH400 One or more of these building blocks may be combined to form elaborate system designs Application 1 The GTH400 uses the terminology Group 1 Group 2 and Group 3 to indicate the three main signal paths within the amplifier Each group may consist of a mono bridged signal or a stereo pair of L R signals depending on the system configuration 6 Channel Bi Amplified System with Qu Non Fading Subwoofers L R L R Preamp or Front speaker Level Rear Group 1 Group2 Group3 L R Input L R Mode Stereo Stereo Stereo SA E Group 2 Input GR 2 EDE Group 3 Input GR 142 Speaker Crossover High Pass High Pass Low Pass Preamp Crossover GTH400 GR 2 GR3 L L L L L fL R R R R R R R Front Speakers Rear Speakers Subwoofers Application 2 5 Channel Bi Amplified System with Non Fading Mono Subwoofer Preamp or Front speaker Level Rear Group 1 Group
15. ess of whether you build or buy it the necessary resistor network has the following configuration Each resistor in the package has the same value lf you know the crossover frequency you want you can calculate the resistor value necessary by solving the following equation Resistor Value in ohms 2 500 000 Frequency in Hz Use the following equation if you have a resistor pack of a known value and want to find its crossover frequency Frequency _ 2 500 000 in Hz Resistor Value in ohms To build chips from discrete resistors solder the resistors to a standard 14 pin DIP Header according to the diagram Ifa DIP Header is not available you may bend the leads of X watt resistors 90 degrees trim them to length and insert them directly into the chip sockets To change the crossover frequency change the resistor network as follows 1 Remove the screws from the bottom panel as shown below 2 Select which resistor module high pass or low pass that you wish to change 3 Achip puller which can be obtained from any electronics store is recommended to remove the resistor chip Pull the resistor chip from the socket as shown in the figure below 4 Place the new module in the socket making sure all pins are lined up with the socket holes Press the module firmly into the socket 5 Replace the bottom lid For further information on h
16. fier Use a minimum of AWG 8 Use wire that 14 GTH400 20107 06 03 98 15 49 Side 15 JBL FACE PLATE SPACER PLATE INCLUDED Cassette CD Tuner Speaker Level Output Connection Use only when line level ouput is not available DASH PANEL Antenna Motor Cassette CD Tuner CD Player or Changer J O o O en en len len len Antenna Input 2 pm CD Input Me mplifier Bower Cassette Receiver Speaker Antenna Power Suppl evel Wires Inputs nen Amplifier Amplifier Antenna Cassette CD Preamp Output Power pang Connection Speaker Paay z Tgl Output RIE Li Connection o 5 u sl E el ss 3 oz E 2857 gi GM E lt a 2 2 o 2 5 al TH sl aga 5 E Eg E i a 8338 l hal E l z LA Blue w White Stripe Remote On Off y E ami B Amplifier ignition Switch Srna 60 Amp Connection Not Included Fuse Ly s Main 12V LA Vehicle Battery
17. haracteristics Overload Protection The GTH400 incorporates elaborate protection cir cuitry to prevent damage to the amplifier circuitry and ensure reliable operation This circuitry will turn the amplifier off in the event of overheating a short circuit on the speaker output wiring or improper power supply connections If the amplifier cycles on 19 GTH400 20107 06 03 98 15 50 Side 29 and off or does not work at all a problem in installation or an abnormal electrical condition is indicated Check speaker wiring for short circuits or impedance loads significantly below 2 ohms 4 ohms in bridged mode Check the power supply voltage at the input of the amplifier to be sure that it is normal between 11 and 16 volts Check that the power wires are not reversed 20 GTH400 20107 06 03 98 15 50 Side 21 7 In Case of Diffic ulty Power on light does not come on e Head unit not on turn the head unit on e Ground wire is disconnected or defective check for continuity with an ohmmeter between the amplifier s ground terminal and a known chassis ground point e Battery wire is disconnected or defective check for approximately 12 volts between the amplifier s battery and ground terminals Blown fuse check amplifier s fuses located on the end panel near the power connector If they are blown replace them with an identical one If the new fuses blow immediately then check all the wiring connections If
18. ing the Inductor and Capacitor values calculated with the following formulas 30 000 High Pass Satellite Crossover Desired crossover Frequency in Hz New Capacitor Value in uF 620 Low Pass Subwoofer Crossover Desired crossover Frequency in Hz New Inductor Value in mH Center Channel B Center Channel Bridged Speaker Connection Ol saminimum 80 L Pad Optional but Recommended GTH400 Ha J OOM e Sree EL SPEAKER OUTPUTS a m E ma A A ea r i REN OUT e E EN O amp 00 eo paz E BATTI GND amp F Center Channel Speaker Minimum 8 Ohms Main Speakers Minimum 4 Ohms When Used Simultaneously Stereo Non Bridged Speaker Connection 16 i GTH400 20107 06 03 98 15 49 Side 1p The GTH400 will draw as much as 60 amps from the vehicle s electrical system enough to overload conventional vehicle wiring Therefore the 12 volt power supply must be taken directly from the positive side of the battery Do not connect to the vehicle s fuse block or to a wire feeding other accessories To prevent electrical system damage or fire a fuse holder and fuse not included maximum 60 Amp must be installed in the power supply wire as close to the battery as possible and befo
19. ity Never use wire nuts insulation displacement connectors i e ScotchLok type or twist and tape connections Do not use electrical tape it will loosen with age and extreme temperatures 4 Mount amplifier in the desired location using the included screws 5 Connect power wiring as shown in the Wiring Diagram on page 18 10 11 12 13 14 15 16 17 Connect the outputs from the head unit to the appropriate inputs of the amplifier according to the Wiring Diagram page 18 with either or both high quality low level signal cables with RCA plugs or the supplied speaker level input connector Install the remote control in the desired location Connect and run the cable from the remote to the amplifier Connect the speakers to the ampli fier according to the Wiring Diagram on page 18 Turn the gain controls to the 1 4 position for all groups Set the bass boost of each group to the desired position Set the crossover switches for each group as desired Set the Group 2 Input and Group 3 Input as desired Set the mode switches to Stereo Left Right or Left Input Only operation for each group Double check your switch settings Reconnect the negative battery cable Note Incorrect switch settings can damage your speakers Turn on the signal source at a low volume level and check for the correct output from each speaker Adjust the amplifier gain controls using the proced
20. no fault is found consult your BL dealer Remote on wire between the head unit and the amplifiers is disconnected or defective check for 12 volts between amplifiers remote on input terminal and the ground wire with the head unit on Power light is on but no sound is heard e Incorrect switch settings make sure from some or all of the speakers that all switches mode input and crossover are in their correct positions for your system configuration Incorrectly connected or shorted speaker wires check for shorts in wiring Defective or disconnected audio cables check for continuity and replace if necessary Incorrect gain adjustment verify that the amplifier gain controls are not turned completely down If they are sound output level may be very low and may give the impression that the system or part of the system is dead 21 GTH400 20107 06 03 98 15 50 Side 22 Power light is on but no sound is heard e Defective head unit or signal processor from some or all of the speakers check each component for proper wiring and operation Defective GTH400 If there is audio signal present at the inputs of the amplifier and there is no output the GTH400 may be defective Alternator whine through the audio system Ground loops follow the wiring with the engine running suggestions in the section called Solving Noise Problems Also verify that the chassis grounding point you have chosen is true ground by
21. onnection for power wires See wiring directions for information on an nan n a n n inng proper connections 9 Fuses Two 30 Amp ATC type fuses OACI m malar PAS i 666660 aie 880900 10 HE 12 para yy o magana MO MAA OO nia k e p g T ARITA hal dE dd Pree Gain Controls Use these controls to adjust the gain of the amplifier channel group See the Adjusting the Gain section on page 25 for tips on proper setup Preamp Crossover Switches These switches control the built in cross overs that are directed to the preamp output connectors Set the switch to F flat for full band operation for that group Set the switch to L low to activate the low pass filter on the pre amp output group for subwoofer use or to use in conjunction with a high pass filtered input signal to create a bandpass crossover for a midrange or midbass driver Set the switch to High Pass to activate the high pass filter for use with satellite speakers or tweeters on the pre amp output group Speaker Crossover Switches These switches control the built in crossovers that are connected to each group s power amplifier cir cuitry Set the switch to F flat for full band operation on a group Set this switch to L low to activate the low pass filter on the selected amplifier group for subwoofer use or 4 GTH400 20107 06 03 98 15 49 Side 19 13 14 15
22. otary type control not one controlled by electronic pushbuttons If you are not certain of the type of fader control your unit has measure the resistance across one Set of speaker outputs with an ohmmeter with the head unit off Adjust the fader control through its entire adjustment range If there is a change in the resistance as the control is adjusted set the jumpers to the 15 ohm position See step 1 page 16 to remove bottom cover Crossover Frequency Adjustments The GTH400 amplifiers include built in frequency selectable crossovers One crossover is connected in series with the amplifier circuitry and the other crossover is connected to the preamp level output jacks These crossovers can be set in either the F full bandwidth operation L subwoofer operation or H satellite operation The crossover frequencies are set by chips inside the amplifier These chips are simply a set of resistors connected across the pins and molded into a single package The crossover frequencies may be changed to any value desired by changing the resistor network Frequency Resistor JBL Part Value Number 50Hz 47k Q 1 23 750 80Hz 33k Q 1 23 817 120Hz 22k Q 1 23 820 200Hz 12k Q 1 23 821 250Hz 10k Q 1 23 810 375Hz 6 8k Q 1 23 822 500Hz 4 7k Q 1 23 815 650Hz 3 9k Q 1 23 823 2 5kHz 1kQ 1 23 824 5kHz 470 Q 1 23 816 12 GTH400 20107 06 03 98 15 49 Side 13 Custom Chip Construction Regardl
23. ow to use the speaker output and preamp output crossovers for system building see the Typical Applications and Add On and Upgrade Steps sections Remote Chassis Installation The wired remote of the GTH400 can be installed either in dash or under dash 13 GTH400 20107 06 03 98 15 49 Side 14 Under Dash Remote Installation 1 Set the GTH400 remote in the installation location and mark two mounting screw hole locations 2 Setthe GTH400 remote aside and drill two pilot holes using a 1 16 1mm bit Be careful not to drill into any of the car s components 3 Secure the spacer and faceplate with the control labeling to the front of the remote control panel using the four smaller screws included 4 Push the two adjustment knobs onto the metal shafts 5 Setthe GTH400 remote back in place and secure it using two sheet metal screws Continue to Step 6 in the In Dash Installation section In Dash Remote Installation 1 Choose a location for the in dash installation and use the template at the back of this manual to mark hole locations as shown on the template 2 Drill the holes indicated on the template 3 Using the diagram on page 15 as reference install the remote behind the panel with the holes just drilled Position the remote so the two knobs feed through panel and the LEDs are in alignment with the holes drilled 4 Place the trim panel with the control labeling over the
24. re the wire travels through the firewall or other metal panel Ground Wire Proper grounding is extremely important Use a heat and oil resistant stranded copper automotive wire equivalent to the size used for the 12V connection Crimp or solder and insulate any wire to wire connections Keep the ground wire as short as possible A ground wire must be solidly connected to a major sheet metal structure of the vehicle such as a panel near the amp mounting location Scrape all paint and primer off the sheet metal at the grounding point to ensure a good electrical connection Attach the wire to the grounding point with a nut bolt and star washer The high current demanded by high powered amplifiers requires a more secure ground than the typical sheet metal screw will provide The color code for the speaker level input harness is as follows Speaker Level Input Harness Color Codes Group 1 Left White Group 1 Left White with Black Stripe Group 1 Right Gray Group 1 Right Gray with Black Stripe Group 2 Left Green Group 2 Left Green with Black Stripe Group 2 Right Purple Group 2 Right Purple with Black Stripe 5 Adjusting the Gain Before operating the GTH400 recheck all wiring connections to make sure they are correct and secure Be sure that a fuse 60 amps not included is installed in the 12V line near the battery Reconnect the negative ground terminal of the ba
25. ting is engaged 10 49 Side 11 st 400 20107 06 03 98 15 JBL ano seyeeds 1ubIy YN O INC Jeyeeds 497 YD O MO seyeeds 1uBiy Z Y9 O MO seyeeds ya7 Z 49 O O Jeyeeds 1YBIY UD O MO seyeeds ya7 Y9 O cd O y 1oyng o o 1oyng C 41 8 SSed UH SSed U IH osag SsedMmoJ Z SSEJMOT Z k ld L eld L PN NSI e y sg dweaig seyeedS eins po y ztLyo e O dH 249 2 1nO3ud eee Z ePon induy ANANI 7 49 air O Gv aang Pa S S s ndul 2 prot Breeds 8 Y3NO X y O a 1oyng ind U e ey o ae SS e er a ee ayan ee l l LNOBYd lo Sz t yng 5 i 4249 T dH oF l b Lig o INOX 249 2 J ar poz Jeyng 29 7 xe o A A Lo l i INdNI 3 Hng E e Zdnoyo 8 10 de 87 t 4 bo x Jayng INOX oF nv Jayng Y LHD OX 4 Zona Lo nv E l gt w 8 I 3 ope lt lt dayng O T am H Hung YINO X gt of je p CEP l sindut janaj dweasd l 0900 00000 TIT tities Se EA a ae yN HN Ww
26. ttery Make sure that the mode switches crossover switches Group 2 amp 3 Input switches and crossover frequency modules are properly set The setting of the gain controls on the GTH400 is important to ensure proper performance low noise levels and maximum reliability in the system As a general rule controls on components at the front end of the system source equalizers electronic crossovers etc should be set as high as possible with the amplifier gain control set as low as possible while still providing adequate volume levels Using a high signal level from the source and a low gain setting on the amplifier will help keep 17 i GTH400 20107 06 03 98 15 49 Side 1e p background noise levels in the system low To adjust a system using a single GTH400 start with all three of the amplifier gain controls fully counterclockwise and the Imaging Enhancer Remote set to Bypass mode Some head units have additional output level controls or switches Set those to their maximum position Set the level controls on any associated equipment such as equalizers and electronic crossovers as recommended by their manufacturers Set all Bass Treble or equalizer controls to their centered or bypassed positions While listening carefully to the system output adjust the volume control of the radio tape deck to the point where you first begin to hear audible distortion Use caution excessive distortion c
27. two shafts and secure it in place with the 4 screws provided 5 Push the two adjustment knobs onto the metal shafts 6 Connect one end of the GTH400 remote control wire included to the connector on the back of the remote control box 7 Run the wire back to the GTH400 main chassis and plug the remote control wire into the Remote In connector on the main chassis Note a standard 6 pin telephone extension cord may be used if more wire is needed for remote control connection These extension cords can be purchased at many electronics or hardware stores In countries with Right Hand Drive vehicles the built in Image Enhancer will not operate properly with standard wiring To use the GTH400 with right hand drive vehicles reverse both the input and output wiring as shown below GTH400 Audio Signal Connection for Right Hand Drive Cars Front Speakers Rear Speakers The right and left inputs and outputs of the GTH400 must be reversed for proper functioning of the virtual Subwoofers center image enhancer when used in a right hand drive automobile Power Supply Connections The power input and remote turn on wires are connected to the GTH400 via the power connector on the end of the amplifier 12V Battery Wire Connect a wire directly from the 12 volt terminal of the battery to the Battery terminal on the ampli
28. uitry does not add synthetic reverb but recovers real information that is masked in conventional systems As a result the overall effect from the Virtual Center circuitry of the GTH400 is incredibly realistic yet simple to adjust and use Best of all the Virtual Center and ambiance recovery circuits do not require specially encoded recordings and work with virtually all conventional stereo tapes discs and broadcasts GTH400 20107 06 03 98 15 49 Side 5 G 2 Installation and use Refer to the Crossover Frequency Adjustments and Speaker Level Input Impedance Adjustments sections of this manual to see if you will need to make alterations to their factory settings 1 Disconnect the negative cable from the battery Note If the vehicle s radio features a code type security system make certain you know the code before disconnecting the battery 2 Runa minimum AWG 8 power cable complete with a 60 amp fuse not included directly from the positive 12V battery terminal to the desired amplifier location Keep the fuse within 6 of the battery terminal and position it before the wire runs through any metal partition 3 Note All wiring connections should be made either by soldering with heatshrink tubing insulation or with high quality crimp type insulated connectors installed with a professional type articulated crimping tool Soldering crimp type terminals is recommended for additional secur
29. ure described in the Adjusting the Gain section page 25 Read the rest of the manual to get maximum use and enjoyment from your amplifier GTH400 20107 06 03 98 15 49 Side s 3 System Design Using the GTH400 3 1 Speaker Requirements When used in the non bridged mode a group channel of the GTH400 can easily drive two 2 ohm speaker loads When only one speaker is connected to the left and right outputs of a group virtually any conventional speaker may be used When two speakers are connected in parallel to a single output left or right of a given group each speaker must have a minimum impedance of at least 4 ohms This ensures that the combined load will not drop below 2 ohms Although the amplifier will not be damaged load impedances lower than 2 ohms will eventually cause the amplifier to overheat activating the protection circuits and causing the unit to shut off until it cools down sufficiently Parallel Wiring 2 ohms Nominal Impedance z Series Wiring fd 8 ohms Nominal Impedance A When a group of the GTH400 is in bridged mode the combined impedance of the speaker or speakers connected to the bridged channels should be at least 4 ohms As in the example above sustained operation of the GTH400 in bridged mode with less than 4 ohms will likely cause overheating The GTH400 must not be used with speakers that have either one of their input terminals wir
30. while sitting in the driver s seat 1 The Power Indicator LED on the GTH400 main chassis should light up when the head unit is turned on 2 Make sure the Front Ambience Bypass On knob and Rear Ambience Driver All knobs are pushed in and rotated completely counterclockwise 3 Play a selection which has vocals and good center information 4 Gently turn up the volume to a comfortable listening level You should hear a very distinctive center image coming from the middle of your dashboard If not make sure the Rear Ambience Driver All knob is pushed in to the Driver 18 GTH400 20107 06 03 98 15 50 Side 19 position for driver optimized sound stage Proceed to push and pull the Rear Ambience knob to hear the effects of Driver and All modes You should hear imaging coming from the middle ofthe dashboard when the knob is pushed in Driver mode You should hear stereo with ambience recovery when the knob is pulled out All mode If you find that the center imaging in the Driver position is slightly offset to the left or right side of the dashboard switch the car size switch located inside of the GTH400 under the bottom cover as shown below This switch optimizes the Imaging Enhancer for standard or large cars IMAGING ENHANCER REMOTE PLUG FRONT PLATE 1 Imaging Enhancer Car Size Switch IMAGE lt ENHANCER
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