JBL 08 GTi User Manual / Operation Manual ▷ View online
Flush Angle
Mounting Instructions
Mounting Instructions
a) Follow steps a through c in
the Flush Mounting Instructions.
the Flush Mounting Instructions.
b) Secure the flush angle mount
adapter to the flush mount cup
using two
adapter to the flush mount cup
using two
5
⁄
16
" screws as shown
in Figure E.
c) Connect the 08GTi speaker
wires (with crossover) to the
tweeter.
wires (with crossover) to the
tweeter.
d) Press the tweeter down onto
the flush angle mount adapter
lower portion making sure to line
up the snaps with the slots in the
tweeter housing.
the flush angle mount adapter
lower portion making sure to line
up the snaps with the slots in the
tweeter housing.
e) Snap the other portion of the
tweeter down onto the angle
adapter.
tweeter down onto the angle
adapter.
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17
Figure E
E
D
Wiring
Use 2-conductor stranded
type, insulated wire to connect
the 08GTi to it’s crossover, and
the crossover to the amplifier. A
minimum wire gauge of 18AWG
is recommended, with larger size
suggested for wire runs longer
than 10 feet.
the 08GTi to it’s crossover, and
the crossover to the amplifier. A
minimum wire gauge of 18AWG
is recommended, with larger size
suggested for wire runs longer
than 10 feet.
The polarity — the positive/
negative orientation of the con-
nections for every speaker to
amplifier connection must be
consistent from left to right chan-
nel to assure proper imaging and
optimum frequency response.
This does not mean that the
nections for every speaker to
amplifier connection must be
consistent from left to right chan-
nel to assure proper imaging and
optimum frequency response.
This does not mean that the
FLUSH
ANGLE
INSTALLATION
ANGLE
INSTALLATION
08GTi Owners Manual 9/17/98 4:17 PM Page 17
08GTi should always be con-
nected in the same polarity as
the midrange however. It is pos-
sible, that due to the difference
in the distance the sound travels
from the midrange to your ears
compared to the distance from
the tweeters in a typical system,
and the short wavelengths of
sound at the crossover frequen-
cy, that a connection where the
tweeters are connected in
reverse polarity from the other
drivers in the system may actu-
ally result in better sound.
Because there is no way to
accurately predict this before
nected in the same polarity as
the midrange however. It is pos-
sible, that due to the difference
in the distance the sound travels
from the midrange to your ears
compared to the distance from
the tweeters in a typical system,
and the short wavelengths of
sound at the crossover frequen-
cy, that a connection where the
tweeters are connected in
reverse polarity from the other
drivers in the system may actu-
ally result in better sound.
Because there is no way to
accurately predict this before
installation, we recommend that
you try the connection both
ways, and leave it in the polarity
that gives the smoothest audible
transition between the midrange
and tweeter. The JBL standard
for polarity marking uses the
solid red wire as positive (+) and
the black striped wire as nega-
tive (–).
you try the connection both
ways, and leave it in the polarity
that gives the smoothest audible
transition between the midrange
and tweeter. The JBL standard
for polarity marking uses the
solid red wire as positive (+) and
the black striped wire as nega-
tive (–).
System Connections:
There are a variety of sys-
tem options available with the
08GTi. The simplest configura-
tion is to use the 08GTi
08GTi. The simplest configura-
tion is to use the 08GTi
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08GTi Owners Manual 9/17/98 4:17 PM Page 18
connected in parallel to a full
range speaker system. Because
the 08GTi is specifically
designed for high frequency
operation, it must have low fre-
quencies blocked by electrical
means to prevent damage to the
speaker. To facilitate this, the
08GTi is supplied with an in-line
12dB per octave 5kHz high-pass
filter. We call this a “protection
network”. This allows you to use
the 08GTi as an add-on to an
existing system by attaching the
supplied protection network in
parallel to the existing speakers,
and connecting the tweeters to
range speaker system. Because
the 08GTi is specifically
designed for high frequency
operation, it must have low fre-
quencies blocked by electrical
means to prevent damage to the
speaker. To facilitate this, the
08GTi is supplied with an in-line
12dB per octave 5kHz high-pass
filter. We call this a “protection
network”. This allows you to use
the 08GTi as an add-on to an
existing system by attaching the
supplied protection network in
parallel to the existing speakers,
and connecting the tweeters to
the output of the network as in
fig. A, B and E. For this applica-
tion, no other network is neces-
sary. A disadvantage of this
type of system is that the high
frequencies are not blocked from
the midrange drivers, making the
performance of this type of sys-
tem typically less accurate than
one where a full crossover is
used.
fig. A, B and E. For this applica-
tion, no other network is neces-
sary. A disadvantage of this
type of system is that the high
frequencies are not blocked from
the midrange drivers, making the
performance of this type of sys-
tem typically less accurate than
one where a full crossover is
used.
A better approach is a com-
plete low-pass or band pass filter
for the midrange driver, com-
bined with a high pass filter for
the tweeter. When a matched
GTi Competition Series system is
for the midrange driver, com-
bined with a high pass filter for
the tweeter. When a matched
GTi Competition Series system is
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