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Introduction
Thanks for purchasing your new
GT series automotive amplifier. The
GT series amplifier you have chosen
includes many unique features to
enhance its performance and utility.
The power amplifier circuitry is a
fully discrete design notable for low
distortion and unusually clean and clear
reproduction quality. Your GT series
amplifier will easily connect to virtually
any car audio system, whether it is
factory installed or purchased
separately.
In addition to conventional preamp-level
inputs, this model features JBL’s
Universal Interface design, which facili-
tates simple connection to factory
radios with the low distortion that is usu-
ally only associated with preamp level
connection. With Universal Interface, a
factory radio can be used either as the
main music source or combined with a
CD changer which includes volume
control capability, simultaneously
connected directly to the amplifier.
3
By providing this two-unit direct connec-
tion, Universal Interface circuitry elimi-
nates the need for an FM modulator to
connect a CD player to factory radios,
improving the fidelity of digital playback.
Also, 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
and turns the amplifier on without an
additional “remote” wire. When the
speaker-level inputs are used exclu-
sively, the preamp-level inputs may be
converted to preamp-level outputs to
drive additional amplifiers or signal
processors.
In addition, the built-in active crossover
provides either high-pass or low-pass
operation. This lets your GT series
amplifier power either subwoofer or
main speakers in a bi-amplified system,
without the expense of an additional
crossover.
JBL 1394 Manual 7/17/98 11:49 AM Page 3