Jbl GT650P, GT800P User Manual

GRAND TOURING SERIES

Automotive Powered

Subwoofer Systems

GT650P & GT800P Owner’s Manual

GENUINE JBL

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Thank You for selecting a

JBL GT Series Powered
Subwoofer System. JBL’s history
of high performance and innova­tion goes back 50 years, yet the
only things old-fashioned about
the GT Series products are the
craftsmanship and attention to
detail that go into each one. The
model you have chosen delivers
exceptional performance in a
compact package. With proper
installation and use, it will pro­vide many years of listening
pleasure.

GT Powered Subwoofer
Features

Your Powered Subwoofer fea­tures a built-in amplifier and
electronic crossover capable of
supplying 80 watts of power to
the specially designed Dual
Voice Coil 2-ohm woofer. The
built-in crossover features an
adjustable low-pass filter and
level, facilitating simple match­ing to virtually all main speaker
systems. In addition, this unit
will accept signals from either
preamp level, or speaker level
inputs, allowing connection to
virtually all source units whether
supplied by the car manufac-

turer or purchased separately. A
built-in music sensing circuit will
turn the unit on in the presence
of a music signal without the
need to run a separate remote
turn-on wire. The unit will turn
off automatically a few minutes
after the music stops to conserve
battery power.

Installation

We recommend that you have
your JBL system professionally
installed by an authorized JBL
automotive dealer. However, if
you prefer to perform the instal­lation yourself, please read the
following information in order to
get the most from your GT Series
Subwoofer.

General Installation Guidelines

Placement and Warnings

Your JBL speakers are designed
for the rigors of the automotive
environment and can withstand
high and low temperatures as
well as extreme humidity.
However, you can effectively
increase the life of your speakers
by avoiding installations that
expose them directly to moisture
or water. For safety and reliabil­ity, they should be securely fas­tened to prevent them from mov­ing around when driving, or from
becoming dangerous missiles in
the event of an accident or sud­den stop.

Select your mounting locations
very carefully so as to avoid cut­ting or drilling into critical com­ponents such as brake or fuel
lines, and electrical wiring,
which may be damaged when
drilling holes for the mounting
screws. Be especially cautious
because these components may
be hidden between double-walled
panels.

The mounting locations for opti­mum performance will vary from
vehicle to vehicle, but in general
your Powered Subwoofer will
work well just about anywhere:
In the trunk, hatch area, or any
surface large enough to accom­modate it. Just make sure to
keep at least 3" clearance around
the port end of the unit so that
you do not restrict port airflow.
Unlike some other brands, your
JBL subwoofer does not require
corner loading for optimum per­formance, which means that it
may be pointed whichever way is
most convenient for your particu­lar installation. Pointing the unit
into a corner will increase its low

frequency output, which will
please some listeners. Others
might find this increase too
much, and will prefer pointing
the unit away from the corner.
Since each vehicle model has dif­ferent acoustic characteristics,
we recommend experimentation
with placement before perma­nently mounting your subwoofer.
Also, leave space around the
amplifier end of the unit so that
airflow is not restricted, other­wise the unit may overheat and
activate its protection circuitry.

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