JBL GT 650P User Manual / Operation Manual ▷ View online
GRAND TOURING SERIES
G E N U I N E J B L
A u t o m o t i v e P o w e r e d
S u b w o o f e r S y s t e m s
G T 6 5 0 P & G T 8 0 0 P O w n e r ’ s M a n u a l
GT650P, 800P Powered Sub OM 7/15/98 10:57 AM Page 1
Thank You
for selecting a
JBL GT Series Powered
Subwoofer System. JBL’s history
of high performance and innova-
tion 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 pro-
vide many years of listening
pleasure.
GT Powered Subwoofer
Features
Features
Your Powered Subwoofer fea-
tures 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 match-
ing 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.
02
Installation
We recommend that you have
your JBL system professionally
installed by an authorized JBL
automotive dealer. However, if
you prefer to perform the instal-
lation yourself, please read the
following information in order to
get the most from your GT Series
Subwoofer.
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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 reliabil-
ity, they should be securely fas-
tened to prevent them from mov-
ing around when driving, or from
becoming dangerous missiles in
the event of an accident or sud-
den stop.
Select your mounting locations
very carefully so as to avoid cut-
ting or drilling into critical com-
ponents 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.
General Installation Guidelines
03
The mounting locations for opti-
mum 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 accom-
modate 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 per-
formance, which means that it
may be pointed whichever way is
most convenient for your particu-
lar 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 dif-
ferent acoustic characteristics,
we recommend experimentation
with placement before perma-
nently mounting your subwoofer.
Also, leave space around the
amplifier end of the unit so that
airflow is not restricted, other-
wise the unit may overheat and
activate its protection circuitry.
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Installing JBL tie-down straps
with your JBL subwoofer
GT650P or GT800P.
04
Figure 1
Securing Your Speakers
The GT Subwoofers must be
securely fastened to the vehicle
with screws, brackets, and/or the
included tie-down straps to pre-
vent movement of the speaker
system while the car is in motion.
A secure mounting will also
improve the bass performance.
Again, because each vehicle is
different, your ingenuity will play
a major role in how and where
you mount your unit. If you do
not feel that you have the skills
or the tools necessary to properly
and safely mount your unit,
please refer the installation to an
authorized JBL dealer. Refer to
Figure 1 for a diagram of how to
use the tie-down straps to secure
the subwoofer to its mounting
surface. When using the strap,
make sure that it is pulled tight.
Wiring
Power Connections
Connect the Black ground wire
coming from the amplifier mod-
ule to the vehicle chassis. Keep
this wire as short as possible. If
you need to extend it, use a mini-
mum #12AWG stranded copper
wire.
Connect the Red wire to a source
of constant
+
12V power. If you
are installing your unit in a sys-
tem which uses a high-quality
power distribution system, your
GT Powered Subwoofer can be
connected to an unused output of
a distribution block. Otherwise,
the power wire should be
extended with a minimum
#12AWG power cable and con-
nected directly to the vehicle
battery. Install a fuseholder with
a 15-amp fuse at the battery end
of this cable. Keep the fuseholder
as close as possible to the battery
(within 18" if possible) and be
sure that it is installed between
the battery and the point where
the wire passes through the fire-
wall or the closest metal panel.
A high-value power supply
capacitor mounted close to the
GT Subwoofer will enhance its
performance.
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