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408/508 MANUAL.QXP 7/17/98 11:21 AM Page 1
408GTi 508GTi
AUTOMOTIVE NEO/KEVLAR MATCHED
COMPONENT SYSTEM WITH CAST FRAME
INSTALLATION GUIDE
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408/508 MANUAL.QXP 7/17/98 11:21 AM Page 2 Table of Contents Welcome to Club GTi .........................................................................3 About this Manual ..............................................................................3 Autosound at its Best .........................................................................3 Designing Your System ......................................................................4 Component Placement..................................
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408/508 MANUAL.QXP 7/17/98 11:21 AM Page 3 Welcome to Club GTi About This Manual Autosound at its Best Thank you for purchasing the finest Because of the performance capability The 408 and 508GTi systems are built Automotive Component Systems JBL has of your GTi Competition Series product, to meet the same rigorous standards of ever produced. As a GTi Competition and the variety of potential system construction and performance that have Series owner, you are a member of a configurations, we st
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408/508 MANUAL.QXP 7/17/98 11:21 AM Page 4 minimizing stray magnetic fields, this accuracy because it is 3 times stronger response to be completely optimized for closed circuit magnetic assembly design than conventional spider materials. each combination. concentrates the magnetic field on the The tweeters in the 408 and 508GTi What does all this technology add voice coil where it provides superior feature domes made from pure titanium. up to? A system with ideal frequency performance. In the
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408/508 MANUAL.QXP 7/17/98 11:21 AM Page 5 and high frequency transducers in a high smooth dispersion pattern, excellent 5. Because of the high acoustic energy quality system, we recommend you use performance may be achieved in any capability of the 408 and 508GTi, the woofer/midrange drivers must be either a high quality active crossover vehicle. Due to the wide variety of vehicles, securely mounted in a rigid panel which such as JBL’s GTX47, GTX4 or GTX2 there is not one “right” way to locat
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408/508 MANUAL.QXP 7/17/98 11:21 AM Page 6 2. Remove the crossover board from the 3. Mark 4 hole locations, drill holes and Mounting Instructions plastic case. secure the bottom cover to the desired Pick a mounting location after reading 3. Use wire ties to secure the plastic case mounting location as shown in Figure B. the recommendations in the Component to the desired location as shown in Before starting make sure no electrical Placement section of this manual. Figure A. or other critical
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408/508 MANUAL.QXP 7/17/98 11:21 AM Page 7 Mounting the Woofer/Midrange in 2. Cut out the speaker hole at the Woofer/Midrange Driver Custom Locations mounting location and drill the three Mounting 1 marked holes with a /8" (3mm) drill. Mounting the Woofer/Midrange to 3. Run speaker wire to the hole location, WOOFER/ Stock Hole Locations MIDRANGE making sure that either an active or 1. Access the stock speaker location and the included passive crossover is remove the stock speaker. The 408 con
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408/508 MANUAL.QXP 7/17/98 11:21 AM Page 8 Logo Orientation on Grille mounting screws to secure the mounting GRILLE FRAME The orientation of the logo on the plate in place as shown in Figure F. metal grille relative to the grille frame can b) Run wire from the 408 and 508GTi be adjusted. Simply remove the metal Crossover to the wire feed-through hole grille and reassemble the metal grille to and connect the wire to the tweeter the grille frame utilizing a different tab slot. making sure to c
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408/508 MANUAL.QXP 7/17/98 11:21 AM Page 9 Tweeter Surface Angle Mounting D Instructions A C a) Using the Surface Angle Mount Template at the back of the manual, drill two screw holes at the desired mounting location, making sure to choose the correct tweeter orientation. Secure the 3 B Surface Angle Mount Adapter with two ⁄4" sheet metal screws as shown in Figure G. b) Secure the mounting plate to surface 5 angle mount adapter using two ⁄16" screws. c) Run the speaker wire from the 408 and Fi
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408/508 MANUAL.QXP 7/17/98 11:21 AM Page 10 3 c) Tighten the larger ⁄4" spring mounting Tweeter Flush Mounting screw to lock the Flush Mounting Cup into Instructions the mounting hole. a) Use a hole saw or other tool and the E d) Secure the mounting plate to the Flush Flush Mount Template at the back of this 5 Mount Cup using three ⁄16" screws. manual to make a hole for the flush mount Connect the speaker wire from the cup in the desired location. Secure the F crossover to the tweeter (see Fig
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408/508 MANUAL.QXP 7/17/98 11:21 AM Page 11 Tweeter Flush Angle Mounting E Instructions D a) Follow steps a through c in the Tweeter Flush Mounting Instructions. b) Secure the Flush Angle Mount Adapter 5 16 to the Flush Mount Cup using two ⁄ " screws as shown in Figure J. c) Connect the 408 and 508GTi speaker wires (from the crossover) to the tweeter, observing correct polarity (see figure K for details). d) Press the tweeter down onto the Flush Angle Mount Adapter lower portion, making sure t
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408/508 MANUAL.QXP 7/17/98 11:21 AM Page 12 The polarity (the positive / negative Wiring Crossover Tweeter Level orientation of the connections) for every Adjustment Use 2-conductor stranded type, speaker and crossover to amplifier insulated wire to connect the 408 and The Gti System Crossover allows you connection must be consistent from left to 508GTi Woofer/Midrange and tweeter to to adjust the level of the GTi Systems right channel to assure proper imaging and the included crossover, and
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408/508 MANUAL.QXP 7/17/98 11:21 AM Page 13 OdB use may be obtained at slightly lower louder. Since no crossover is perfect, it is Tweeter Level Adjustment Switch –2dB –4dB power handling levels. advisable to keep your crossover points For the best performance, we away from the range where your hearing is recommend that an active crossover with most sensitive. Therefore we recommend a minimum of 12dB per octave slope be that you try to keep the high-pass used for the transition point between t
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408/508 MANUAL.QXP 7/17/98 11:21 AM Page 14 used and at or above 3.5kHz if you are JBL loudspeakers will produce reasonable speaker. This margin of reserve power will using an 18 or 24dB per octave crossover. volume levels in the automotive environment ensure that the amplifier will not attempt to In this configuration, the crossovers using very little amplifier power. However, deliver more power than its design allows. supplied with the 408 and 508GTi are the use of a low-powered amplifier to
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408/508 MANUAL.QXP 7/17/98 11:21 AM Page 15 crossovers near wires carrying high currents such as battery cables or wires leading to ammeters or tachometers. Distortion is usually the result of overdriving one or more components in the system. The problem is most likely insufficient amplifier power, or improper setting of gain controls. Refer to the instructions which came with the electronics for assistance. The 408 and 508GTi will not play as loudly, or handle the full rated power, when used
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408/508 MANUAL.QXP 7/17/98 11:21 AM Page 16 Specifications: 408GTi 508GTi Frequency response: 80–22kHz 60–22kHz Recommended minimum High-Pass Crossover Frequency for Medium Power Operation: 80Hz 60Hz Continuous Power Handling With 12dB Passive Network High Passed at Recommended Minimum Frequency: 100 Watts 150 Watts Continuous Power Handling with 12dB Passive Network High Passed at 150–200Hz (Midrange Operation): 150 Watts 200 Watts Continuous Power Handling When Used Without High-Pass
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408/508 MANUAL.QXP 7/17/98 11:21 AM Page 17 Thiele-Small Specifications: 408 GTi 508 GTi Free Air Resonance (Fs): 125Hz 100Hz Electrical Damping (Qes): 0.52 0.51 Mechanical Damping (Qms): 5.17 5.14 Total Damping (Qt): 0.47 0.4 Equivalent Volume of Compilance (Vas): 0.0388 cu. ft. (1.10 liters) 0.1059 cu. ft. (3.0 liters) 2 2 Effective Cone Area (Sd): 9.3 sq. inches (0.0060 m ) 14.26 sq. inches (0.0092 m ) Center to Peak Linear Excursion (Xmax): 0.126 inches (3.2mm) 0.126 inches (3.2mm) Voice C
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408/508 MANUAL.QXP 7/17/98 11:21 AM Page 18 11 Drill /32" (8.7mm) holes for wire feed through 3 Drill /32" (2.9mm) hole in two places TWEETER SURFACE ANGLE MOUNT TEMPLATE Tweeter is angled in this direction 19
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408/508 MANUAL.QXP 7/17/98 11:21 AM Page 19 11 Drill /32" (8.7mm) holes for wire feed through TWEETER MOUNTING PLATE TEMPLATE 3 Drill /32" (2.4mm) holes for mounting screw 21
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408/508 MANUAL.QXP 7/17/98 11:21 AM Page 20 Cut Hole Using 1 1 2 /8-2 /4" (54mm) hole saw TWEETER FLUSH MOUNT TEMPLATE 23
