1. Introductioneither subwoofer or component
Thanks for purchasing your newspeakers in a bi-amplified system,
GT series automotive amplifier.or conventional full-range speakers
The GT series amplifier you havein simpler systems.
chosen includes many uniqueThe GTS300 and 600 also include
features to enhance its perfor-preamp-level outputs which can
mance and utility. The power amp-provide either full-range, high-pass
lifier circuitry is a fully discreteor low-pass signal to drive
design notable for its low dis-additional amplifiers. This lets you
tortion and unusually clean andbuild systems of virtually any
clear sound quality. Your GT seriesdesign without requiring a
amplifier will easily connect toseparate electronic crossover.
virtually any car audio system,
whether it is factory installed or1.2 About Installation
one purchased separately.Although the GTS300 and GTS600
In addition to conventionalare designed to make installation
preamplevel inputs, this modelas easy as possible, they are
features JBLOs Universal Interfacesophisticated products that require
design, which facilitates simpleproper installation to realize their
connection to factory radios withfull performance potential.
the low distortion that is usuallyIf you feel you do not have the
only associated with preamp levelnecessary knowledge and skills we
connection. With Universal Inter-strongly recommend that the
face, a factory radio can be usedinstallation be done by your
either as the main music source orauthorized JBL dealer.
combined with a CD player orIf you choose to install the GTS300
changer, which includes volumeor GTS600 yourself read all of the
control capability, simultaneouslyinformation in this manual
connected to the amplifier. Bybeforeyou start the installation.
providing this two-unit directPay particular attention to the
connection, Universal Interfacesafety precautions and notes.
circuitry eliminates the need for an
2. Installation and UseFM modulator to interface a CD
player to factory radios, improvingRefer to the OCrossover Frequency
the fidelity of digital playback.Adjustments� and OSpeaker Level
In addition, when using a high-Input Impedance Adjustments�
powered (BTL) radio through thesections of this manual to see if
speaker-level inputs, Commonyou will need to make alterations
Sense turn-on circuitry senses theto their factory settings. If you are
common-mode voltage present onnot using the built-in crossover, or
the radioOs speaker wires, turningthe speaker level inputs, you may
the amplifier on without anskip this step.
additional Oremote� wire.1. Disconnect the negative cable
Also, the built-in active crossoverfrom the battery. Note: If the
provides either full-range, high-vehicleOs radio features a code
pass or low-pass operation. Thistype security system, make
lets your GT series amplifier powercertain you know the code
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