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JBL 508GTI manual

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Table of contents for the manual

  • Page 1

    408GTi 508GTi AUTOMOTIVE NEO/KEVLAR MATCHED COMPONENT SYSTEM WITH CAST FRAME INSTALLATION GUIDE 408/508 MANUAL.QXP 7/17/98 11:21 AM Page 1[...]

  • Page 2

    T able of Contents Welcome to Club GT i .........................................................................3 About this Manual ..............................................................................3 Autosound at its Best .........................................................................3 Designing Y our System .................[...]

  • Page 3

    Welcome to Club GT i Thank you for purchasing the finest Automotive Component Systems JBL has ever produced. As a GT i 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 GT i.” By sending in the customer information card, which you will fi[...]

  • Page 4

    minimizing stray magnetic fields, this closed circuit magnetic assembly design concentrates the magnetic field on the voice coil where it provides superior performance. In the woofer/midrange drivers, this high concentration of magnetic power is coupled to a 2" Edge-wound Aluminum Wire V oice Coil on a High T emperature Fiberglass Former . Thi[...]

  • Page 5

    and high frequency transducers in a high quality system, we recommend you use either a high quality active crossover such as JBL ’s GTX47, GTX4 or GTX2 to provide optimum matching to your subwoofer or woofer/midbass loudspeaker . If you prefer passive crossovers, we recommend that you use only high quality audiophile grade film-type capacitors an[...]

  • Page 6

    Mounting Instructions Pick a mounting location after reading the recommendations in the Component Placement section of this manual. Installing the GTi System Crossover The GT i system crossover should be mounted securely to prevent damage to the crossover or possible loosening of wiring connections. Choose one of the crossover mounting methods and [...]

  • Page 7

    Woofer/Midrange Driver Mounting Mounting the Woofer/Midrange to Stock Hole Locations 1. Access the stock speaker location and remove the stock speaker . The 408 and 508GT i include mounting ring adapters which allow the speaker to be mounted in standard 4" and 5 1 / 4 " holes respectively . 2. Attach the mounting ring adapter to the stock[...]

  • Page 8

    Note: The metal grille is designed so that it can be covered with grille cloth if desired. Simply , remove the metal grille from the grille frame as shown in Figure E. Then use spray adhesive to glue and wrap the grille cloth to the metal grille. Push the metal grille with cloth back in the grille frame. For even better interior matching it is also[...]

  • Page 9

    T weeter Surface Angle Mounting Instructions 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 Surface Angle Mount Adapter with two 3 ⁄ 4 " sheet metal screws as shown in Figure G. b) Secure the mountin[...]

  • Page 10

    T weeter Flush Mounting Instructions a) Use a hole saw or other tool and the Flush Mount T emplate at the back of this manual to make a hole for the flush mount cup in the desired location. Secure the metal spring to the Flush Mount Cup using one metal spring screw as shown in Figure H. T ighten the screw only enough to keep the metal spring from f[...]

  • Page 11

    T weeter Flush Angle Mounting Instructions a) Follow steps a through c in the T weeter Flush Mounting Instructions. b) Secure the Flush Angle Mount Adapter to the Flush Mount Cup using two 5 ⁄ 16 " screws as shown in Figure J. c) Connect the 408 and 508GT i speaker wires (from the crossover) to the tweeter , observing correct polarity (see f[...]

  • Page 12

    Wiring Use 2-conductor stranded type, insulated wire to connect the 408 and 508GT i Woofer/Midrange and tweeter to the included crossover , and the crossover to the amplifier as shown in Figure K. A minimum wire gauge of 18A WG is recommended, with larger size suggested for wire runs longer than 10 feet. The polarity (the positive / negative orient[...]

  • Page 13

    System Connections There are a variety of system options available with the 408 and 508GT i. The simplest configuration is to use the 408 and 508GT i full range. Although this will yield good sound, the best performance will be achieved in a high-end system which includes subwoofers and, optionally , midbass transducers. Because the 408 and 508GT i[...]

  • Page 14

    used and at or above 3.5kHz if you are using an 18 or 24dB per octave crossover . In this configuration, the crossovers supplied with the 408 and 508GT i are not used. For tweeter protection, a 1.5A fast acting fuse should be installed in series with the tweeter . The maximum recommended RMS amplifier power routed directly to the woofer/midrange is[...]

  • 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 electroni[...]

  • Page 16

    16 Specifications: 408GT i 508GT i 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 W atts 150 W atts Continuous Power Handling with 12dB Passive Network High Pass[...]

  • Page 17

    17 Thiele-Small Specifications: 408 GT i 508 GTi Free Air Resonance (Fs): 125Hz 100Hz Electrical Damping (Qes): 0.52 0.51 Mechanical Damping (Qms): 5.17 5.14 T otal Damping (Qt): 0.47 0.4 Equivalent V olume of Compilance (V as): 0.0388 cu. ft. (1.10 liters) 0.1059 cu. ft. (3.0 liters) Effective Cone Area (Sd): 9.3 sq. inches (0.0060 m 2 ) 14.26 sq.[...]

  • Page 18

    19 Tweeter is angled in this direction Drill 3 / 32 " (2.9mm) hole in two places Drill 11 / 32 " (8.7mm) holes for wire feed through TWEETER SURF ACE ANGLE MOUNT TEMPLA TE 408/508 MANUAL.QXP 7/17/98 11:21 AM Page 18[...]

  • Page 19

    21 Drill 3 / 32 " (2.4mm) holes for mounting screw Drill 11 / 32 " (8.7mm) holes for wire feed through TWEETER MOUNTING PLA TE TEMPLA TE 408/508 MANUAL.QXP 7/17/98 11:21 AM Page 19[...]

  • Page 20

    23 Cut Hole Using 2 1 / 8 -2 1 / 4 " (54mm) hole saw TWEETER FLUSH MOUNT TEMPLA TE 408/508 MANUAL.QXP 7/17/98 11:21 AM Page 20[...]

  • Page 21

    408GTi 508GTi AUTOMOTIVE NEO COMPONENT SYST INSTALLATION GU JBL Consumer Products, Inc. 80 Crossways Park West Woodbury, NY 11797 8500 Balboa Blvd. Northridge, CA 91329 1-800-336-4JBL A Harman International Company NMGP/N:306385-001 5/94 408/508 MANUAL.QXP 7/17/98 11:21 AM Page B[...]