JBL 08GTi, Installation Manual

Page: 19 / 32

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 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.
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
19
08GTi Owners Manual 9/17/98 4:17 PM Page 19