Wiring; System Connections - JBL 600GTI Installation Manual

Wiring

Use 2-conductor stranded type,
insulated wire to connect the 600GTi
Woofer/Midbass and Tweeter to the
included crossover, and the crossover to
the amplifier as shown in Figure B. A
minimum wire gauge of 18AWG is
recommended, with larger size suggested
for wire runs longer than 10 feet.
tweeter
JBL 08GTi
AMPLIFIER
midrange
JBL 400GTi
AMPLIFIER
midbass
JBL 600GTi
ACTIVE
AMPLIFIER
X-OVER
woofer
JBL 1200GTi
AMPLIFIER
tweeter
JBL 08GTi
PASSIVE
AMPLIFIER
X-OVER
midrange
JBL 400GTi
midbass
JBL 600GTi
Figure B
woofer
JBL 1200GTi
The polarity (the positive / negative
orientation of the connections) for every
speaker and crossover to amplifier
connection must be consistent from left to
right channel to assure proper imaging and
optimum frequency response. This does
not mean that the 600GTi should always
be connected in the same polarity as the
other drivers in the system however. It is
possible, that due to the difference in the
distance the sound travels from the
woofer/midbass to your ears compared to
the distance from the woofer/midrange or
subwoofer in a typical system, and the
short wavelengths of sound at the
crossover frequency, that a connection
HEAD
where the midranges or subwoofers are
UNIT
connected in reverse polarity from the
600GTi Drivers may actually result in
better sound. Because there is no way to
accurately predict this before installation,
HEAD we recommend that you try the connection
UNIT
both ways, and leave it in the polarity that
gives the smoothest audible transition
between the woofer/midbass, subwoofer
and/or midrange. When the subwoofer,
midrange, and midbass drivers are
mounted close to each other, the in-phase
connection will usually yield the best
sound. Active crossovers such as the JBL
GTX47 sometimes include a phase switch
that lets you easily try both polarities by
merely flipping the switch polarity.

System Connections

There are a variety of system options
available with the 600GTi. The simplest
configuration is to use the 600GTi low
passed. In this situation, the 600GTi is
used as a small subwoofer. In small
vehicles at moderate power levels this will
yield good sound. You may also wish to
use the 600GTi in multiples, for example
four 600GTi Drivers will move nearly the
same air volume as a pair of 10" drivers.
This is a good solution when you have a
narrow area that won't fit larger diameter
subwoofers. The best performance will be
achieved in a high-end 4-way system
which includes subwoofers and additional
midrange and high frequency transducers.
Here the 600GTi is at its best, adding
impact and power to the midbass
7