Read JBL GTH 400 (serv.man2) User Guide / Operation Manual online
GTH400-20107 06/03/98 15:49 Side 26
GTH400
GTH400
6/5/4/3 CHANNEL AUTOMOTIVE POWER AMPLIFIER
OWNER’S MANUAL
6/5/4/3 CHANNEL AUTOMOTIVE POWER AMPLIFIER
OWNER’S MANUAL
GTH400-20107 06/03/98 15:49 Side 1
Table of Contents
1. Introduction...................................................................................... 3
1.1 Features .................................................................................... 4
1.2 About Installation ...................................................................... 4
1.2 About Installation ...................................................................... 4
2. Installation and use .......................................................................... 5
3. System Design with the GTH400..................................................... 6
3. System Design with the GTH400..................................................... 6
3.1 Speaker Requirements ............................................................. 6
3.2 Typical Applications.................................................................. 7
3.2 Typical Applications.................................................................. 7
4. Installation and Use ......................................................................... 9
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
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
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 2
3
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.
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 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.
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.
GTH400-20107 06/03/98 15:49 Side 3
