08GTi Owners Manual
Contents
1. A B and E For this applica tion no other network is neces sary A disadvantage of this type of system is that the high frequencies are not blocked from the midrange drivers making the performance of this type of sys tem typically less accurate than one where a full crossover is used A better approach is a com plete low pass or band pass filter for the midrange driver com bined with a high pass filter for the tweeter When a matched GTi Competition Series system is 19 used the best crossover choice is the laboratory optimized system matched crossover which is included with the 408GTi or 508GTi system If you have not yet installed your components we suggest that you consult your dealer for this system package When a crossover such as this one is used you do not use the protection network as it will inter act with the main crossover in a detrimental way It is also redun dant the main crossover will per form all of the functions of the protection network If the pack aged GTi system crossover is 20 not used the protection network should be used as the high pass element and a 5kHz low pass fil ter may be built or purchased to connect in line with the midrange driver The most advanced system designs use active electronic crossovers such as the JBL GTX2 or GTX47 When an active crossover is used the pro tection network is not used you should however install an in line fuse holder containing2. TEMPLATE Drill 3 22 2 4mm holes for 27 mounting screw p 7 y Cut Hole Using 2 4 2 4 54mm hole saw 086Ti FLUSH MOUNT TEMPLATE 29 JBL continually engages in research related to products improvement New materials production methods and design refinements are introduced into exist ing products without notice as a routine expression of this philosophy For this reason any current JBL GTi loudspeaker may differ in some respect from its published description but will always equal or exceed the original design specifi cations unless otherwise stated 1994 All rights reserved JBL Consumer Products Incorporated 80 Crossways Park West Woodbury NY 11797 8500 Balboa Blvd Northridge CA 91329 1 800 336 4JBL in the USA JBL Consumer Products Inc B 80 Crossways Park West UBL Woodbury NY 11797 8500 Balboa Blvd Northridge CA 91329 1 800 336 4JBL in the USA Id A Harman International Company Made in USA NMGP N 302695 001 5 94
3. professional speaker systems The 08GTi incorporates advanced JBL pure titanium technology which is especially suited to the unique acoustic environment of modern vehicles The 08GTi has been engineered to provide excellent dispersion and frequency response along with minimum size and flexible installation options for optimizing placement within the vehicle Pure titanium has long been known to have a very high stiff ness to weight ratio making it ideal for treble reproduction However only JBL has tamed titanium through a special manu facturing process The dome of the O8GTi is created using spe cial nitrogen gas cooled forming machines which can create a uniformly paper thin dome with out the work hardening or defor mation which causes resonances in domes made without benefit of this process The result is exceptionally smooth and detailed high fre quency music reproduction to beyond 20 000Hz high output capability and a clean sound that cuts through road noise Designing Your System The availability of separate components makes a variety of system designs possible Because of its wide range design and variety of mounting options the O8GTi is perfect for many dif ferent applications The overall quality of any system design is a result of how well all of the com ponents work together not just the result of the performance of 6 any one component JBL GTi Competition Series midrange midbas
4. that due to the difference in the distance the sound travels from the midrange to your ears compared to the distance from the tweeters in a typical system and the short wavelengths of sound at the crossover frequen cy that a connection where the tweeters are connected in reverse polarity from the other drivers in the system may actu ally result in better sound Because there is no way to accurately predict this before 18 installation we recommend that you try the connection both ways and leave it in the polarity that gives the smoothest audible transition between the midrange and tweeter The JBL standard for polarity marking uses the solid red wire as positive and the black striped wire as nega tive System Connections There are a variety of sys tem options available with the O8GTi The simplest configura tion is to use the 08GTi connected in parallel to a full range speaker system Because the 08GTi is specifically designed for high frequency operation it must have low fre quencies blocked by electrical means to prevent damage to the speaker To facilitate this the 08GTi is supplied with an in line 12dB per octave 5kHz high pass filter We call this a protection network This allows you to use the O8GTi as an add on to an existing system by attaching the supplied protection network in parallel to the existing speakers and connecting the tweeters to the output of the network as in fig
5. 086Ti AUTOMOTIVE TITANIUM DOME TWEETER Table of Contents Welcome to Club GTi 5c lt c cc lt lt lt lt 5 About this Manual lt lt lt lt lt lt lt lt lt s Autosound at its BeSt asistar Designing Your System Akakas Component Placement cccceeQgereeeeeeeeeeees Installation Warnings and Tips Mounting Instructions Surface Mounting Instruction Surface Angle Mounting Ins Flush Mounting Instructions s Flush Angle Mounting Instructions WIIN Er I a System Connections ccs lt xs A Note on Power Handling In Case of Difficulty 00 0 aaa aaa aaa kaka Seeiso rrm Templa es SS 2 Welcome to Club GTi Thank you for purchasing the finest automotive tweeter JBL has ever produced As a GTi Competition Series owner you are a member of a select group of people who enjoy the most advanced mobile audio products available We call this group Club GTi By sending in the customer information card which you will find attached to your warranty we will automati cally register you as a Club GTi member which will give you access to exclusive Club GTi apparel and other special offers we will make available from time to time We suggest you fil
6. a 1 5A fast acting fuse between the power amplifier and the tweeter Set the crossover frequency at or above 5kHz if a 12dB per octave crossover is used and at or above 3 5kHz if you are using an 18 or 24dB per octave crossover For safety the maximum recom mended amplifier power routed directly to the O8GTi tweeter is 125 Watts RMS In fact due to the nature of music and the reduced energy present at high frequencies there is little reason to use an amplifier larger than 50 Watts per channel on the tweeter regardless of the power of other speakers in the system 21 A Note on Power Handling As a result of their high effi ciency all JBL loudspeakers will produce reasonable volume levels in the automotive environ ment using very little amplifier power However the use of a small amplifier to attain very high volume levels could lead to over driving the amplifier This will generate high distortion levels which can easily damage loud speakers even if the rated power of the amplifier is below the rated maximum power handling of the loud speaker 22 As a general rule do not turn up the volume control past the point where you hear distor tion in the form of either signal distortion from an overdriven amplifier or mechanical noise from an overstressed speaker For the best performance and system reliability you should select an amplifier with an output rating greater than the maximum power likel
7. components in the system The problem is most likely insufficient amplifier power or improper set ting of gain controls Refer to the instructions which came with the electronics for assistance The 08GTi will sound distorted if it is used without a crossover or protection network It will also not last very long Never use the 08GTi without one of the 24 recommended crossover options If you want to talk to us about any problems call JBL Customer Service at 1 800 336 4JBL 4525 between 9AM and 5PM eastern time Specifications Frequency response without crossover 3 5kHz 22kHz Frequency response with supplied protection network 5Khz 22kHz I E C power handling with included 5kHz Protection net work 60 Watts RMS Power handling with 3 5kHz 18dB octave active crossover 60 Watts RMS Recommended system amp lifier power range 20 Watts 125 Watts RMS per channel Sensitivity 92dB 2 83V 1Meter Dimensions Overall Diameter 50mm 1 95 inches Height 18mm 0 69 inches Height with angle adapter 38mm 1 5 inches Flush mount cutout diameter 54mm 2 inches Flush mount depth 23mm 0 9 inches 25 Drill 1 32 8 7mm Abe holes for wire feed through A e j Drill 3 42 2 9mm E hole in two places O8GTi SURFACE p ANGLE o MOUNT h TEMPLATE Tweeter is angled in this direction Drill s2 8 7mm holes for wire feed through 086Ti MOUNTING PLATE
8. ever knowledge of the following consid erations will help you get the most from your system The most spacious stereo image is achieved when the 08GTi s are placed as wide apart as possible The best center image will be achieved when the distance from the left speaker to your left ear is as equal as possi ble to the distance from the right speaker to your right ear This is most easily achieved by placing the 08GTi as far forward as you can Treble is directional in nature High frequencies fall off as you move off of the tweeter s axis Because of this you can improve imaging by using the angle mount capabilities of the 08GTi to point each tweeter s axis across the car to the listener on the opposite side This will make each listener slightly off axis of the tweeter they are closest to which helps to compensate for the fact that they are always closer to one tweeter than to the other 4 The best system integration is achieved when the tweeter is mounted close to the midrange speaker Installing the tweeter close to the midrange helps smooth the transition from the midrange to the tweeter at the crossover point 5 You will get the best fre quency response when the path from the tweeter to your ear is unobstructed Installation Warnings and Tips Be careful not to cut or drill into fuel tanks fuel lines brake or hydraulic lines vacuum lines or electrical wiring when work
9. ing on your vehicle Inspect behind panels before you cut or drill Do not use the 08GTi unmounted Failure to securely mount this product could result in damage or injury particularly in the event of an accident Do not mount the 08GTi where it will get wet Always disconnect the ground wire from the battery be fore doing any work on the vehicle Mounting Instructions The O8GTi tweeter includes accessories for four different mounting configurations Take a look at all the possibilities described in the following para graphs pick one follow the steps and you ll soon be done Surface Mounting Instructions a Using the Mounting Plate Template at the back of this manual Pick a mounting location for the tweeter making sure that speaker wire can be run to this location Flat surfaces 10 work best Drill the holes as shown on the template in the desired mounting location Use three mounting screws to secure the mounting plate in place as shown in Figure A b Run the included speaker wire with the O8GTi crossover to the wire feed through hole and connect the wire to the tweeter making sure to connect to and to c Push the tweeter down onto the mounting plate making sure to line up the bayonet tabs with the slots in the tweeter housing d Twist the tweeter clockwise about 14 to lock it into position Figure A SURFACE MOUNT INSTALLATION 11 Surface Angle Mounting Instructi
10. l the card out at your earliest conve nience Also be sure to save your sales receipt in a safe place It will be necessary to use this doc ument as proof of purchase in the event that you ever need warranty service It is also use ful for insurance purposes and for establishing value when you re sell your vehicle About This Manual Because of the performance capability of your GTi Compe tition Series product and the variety of potential system con figurations we strongly recom mend that you have the system professionally installed You will also get a better warranty if your equipment is professionally installed by an authorized GTi dealer This manual provides information on the installation and use to help a skilled techni cian get the most from your GTi Competition Series product This manual does not cover 4 basic information about installa tion which is common knowledge to a professional installer except for information which is unique to the O8GTi If you feel you possess the necessary skills and prefer to install the equipment yourself this manual will provide you with the necessary specifics to prop erly use the 08GTi in typical installations Consult your JBL dealer or a qualified technician for more information Autosound at its Best The 08GTi has been built to meet the same rigorous stan dards of construction and perfor mance that have long estab lished JBL s renowned home and
11. onnect the speaker wire MOUNT to the tweeter See Figure D INSTALLATION e Push the tweeter down onto the mounting plate making sure to line up the bayonet tabs with the slots V in the tweeter housing Figure D f Twist the tweeter clockwise about to lock it into position Flush Angle e Snap the other portion of the Mounting Instructions tweeter down onto the angle adapter a Follow steps a through c in the Flush Mounting Instructions b Secure the flush angle mount adapter to the flush mount cup using two e screws as shown in Figure E c Connect the O8GTi speaker wires with crossover to the tweeter d Press the tweeter down onto the flush angle mount adapter lower portion making sure to line up the snaps with the slots in the tweeter housing 16 Figure E FLUSH ANGLE INSTALLATION Wiring Use 2 conductor stranded type insulated wire to connect the O8GTi to it s crossover and the crossover to the amplifier A minimum wire gauge of 18AWG is recommended with larger size suggested for wire runs longer than 10 feet The polarity the positive negative orientation of the con nections for every speaker to amplifier connection must be consistent from left to right chan nel to assure proper imaging and optimum frequency response This does not mean that the 17 O8GTi should always be con nected in the same polarity as the midrange however It is pos sible
12. ons a Using the Surface Angle Mount template at the back of the manual drill two screw holes at the desired mounting location Secure the Surface angle mount adapter with two sheet metal screws as shown in figure B b Secure the mounting plate to surface angle mount adapter using two 3 2 screws c Run the included speaker wire with the O8GTi crossover to the wire through hole and connect 12 the wire to the tweeter making sure to connect to and to d Push the tweeter down onto the mounting plate making sure to line up the bayonet tabs with the slots in the tweeter housing e Twist the tweeter clockwise about to lock it into position Figure B SURFACE ANGLE INSTALLATION 13 Flush Mounting c Tighten the larger spring Instructions mounting screw to lock the flush mounting cup into the mounting a Use a hole saw or other tool and hole the Flush Mount Template at the back of this manual to make a hole for the flush mount cup in the desired location Secure the metal J spring to the flush mount cup using one metal spring screw as shown in figure C Tighten the screw only enough to keep the metal spring from falling off Flush Mount Cup b Push the flush mount cup with the metal spring into the hole that was cut in step a FigueC FLUSH MOUNT INSTALLATION gt 14 d Secure the mounting plate to the flush mount cup using three 6 FLUSH screws C
13. s and subwoofer trans ducers are the ideal companion products to your 08GTi Each of the GTi Competition Series com ponents is designed to comple ment the others to provide the highest performance with the simplest and most predictable system design The 08GTi may be used as the primary high fre quency transducer in a system or as an add on tweeter or super tweeter used to improve the high frequency response of an exist ing system A high pass filter is included to facilitate use of the 08GTi as an add on tweeter To use the 08GTi as the primary high frequency transducer in a high quality system we recom mend you use either a high qual ity active crossover such as JBL s GTX47 or GTX2 If you prefer passive crossovers we suggest a complete 408GTi or 508GTi system which includes the 08GTi an outstanding 4 or 5 midrange and a laboratory optimized crossover Your GTi Competition series dealer is uniquely qualified to help guide you on the best system configu ration for your needs Component Placement The location of each of the loudspeakers plays a vital role in achieving proper frequency response and spacious imaging Because the 08GTi has an extremely wide and smooth dis persion pattern and because it is supplied with extremely versatile mounting hardware excellent per formance may be achieved in any vehicle Due to the wide variety of vehicles there is not one right way to locate the 08GTi how
14. y to be used to gener ate the desired volume levels If you want your system Loud Clear we suggest that you step up to a JBL power amplifier which has an RMS power rating equal to but not exceeding the Maximum Recommended Amplifier Power listed in the specifications of your specific JBL speaker This margin of reserve power will ensure that the amplifier will not attempt to deliver more power than its design allows Your dealer will be happy to point out which high power JBL amplifiers are opti mum for your application and lis tening habits Following these guidelines will provide virtually distortion free sound reproduction and long loudspeaker life In Case of Difficulty The most common difficul ties are noise distortion and intermittent connections System noise is usually not the fault of the O8GTi Hiss or alternator whine is most often the result of faulty grounding of the system electronics or improp er setting of amplifier level con trols An exception to this is if the protection network or passive crossover is mounted near a source of radiated noise the net work may pick up this noise with sufficient power to drive the O8GTi tweeters For this reason 23 be careful not to mount any pas sive crossover components near wires carrying high currents such as battery cables or wires lead ing to ammeters or tachometers Distortion is usually the result of overdriving one or more
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