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Anleitung Zusammenfassung
Introduction...................................................................................... 3 1.1 Features .................................................................................... 4 1.2 About Installation ...................................................................... 4 2. Installation and use.......................................................................... 5 3. System Design with the GTH400..................................................... 6 3.1 Speaker Requirements ............................................................. 6 3.2 Typical Applications.................................................................. 7 4. Installation and Use ......................................................................... 9 4.1 Controls and Connectors.......................................................... 9 4.2 Internal Adjustments ................................................................ 12 Speaker-Level Input Impedance Adjustments......................... 12 Crossover Frequency Adjustments.......................................... 12 Custom Chip construction....................................................... 13 Remote Chassis Installation .................................................... 13 Unter-Dash Remote Installation............................................... 14 In-Dash remote Installation...................................................... 14 Power Supply Connections ..................................................... 14 Simultaneous Speaker Stereo-Mono Connection Diagram..... 16 Speaker-Level Input Harness - Color Codes........................... 17 5. Adjusting the Gain .......................................................................... 17 6. Important Characteristics ............................................................... 19 7. In Case of Difficulty......................................................................... 21 8. Specifications ................................................................................. 23 Owner’s Warranty Information Model Number Serial Number Dealer Name City, State, Zip Sales Receipt Number Date of Purchase GTH400-20107 06/03/98 15:49 Side 3 1. Introduction Thanks for purchasing your new GT series automotive multichannel amplifier. 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 JBL’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. 3 GTH400-20107 06/03/98 15:49 Side 4 1.1 Features Theory of Operation – Virtual Center Image Enhancer JBL’s breakthrough “Virtual Center” circuitry is the result of the understanding of how the human ear responds to timing, frequency, and amplitude cues to determine the apparent direction of a sound source. Virtual Center circuitry manipulates the analog signal in real time to provide each of the driver’s ears with the signal they would receive if the driver was seated in the center of the vehicle. This provides a stable, centered image to the driver much like that obtained with 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 present in all conventional stereo recordings. Unlike DSP, the JBL circuitry 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. 4 1.2 About Installation Although the GTH400 is designed to make installation as easy as possible, it is an extremely sophisticated product that requires proper installation...