Read JBL GT 800P User Guide / Operation Manual online
Equivalently, if you are using
the speaker-level connection,
you can connect the Powered
Subwoofer in parallel with the
speakers. The Powered
Subwoofer will sample the
signal, but will not load the
source unit the way a second
pair of conventional speakers
would, so you do not need to
worry that this connection will
lower the speaker impedance
too far for your amplifier or
source unit.
If you are using two GT Powered
Subwoofers, only one input
channel needs to be used on
each subwoofer.
Please refer to Figure 2 on
page 5 for a wiring diagram.
06
Adjustments
Volume Level and Crossover
Frequency (labeled ”X-Over”)
adjustments are done by ear. The
Crossover Frequency may be
adjusted over the range of 80Hz
to 150Hz. Midpoint on the X-Over
scale is at 125Hz. The knob at
“9:00” equals 100Hz, and at
“3:00” equals 175Hz.
1. We recommend starting your
setup procedure with the
volume control set at the
minimum, and the X-Over set
at the most counterclockwise
(80Hz) position.
2. Increase the volume level of
the source unit to the maxi-
mum listening position. This
is the point where the main
speakers in the system begin
to sound slightly distorted.
3. Back off on the source unit’s
volume control until just below
the point where you hear dis-
tortion. Slowly increase the
Powered Subwoofer volume
control until you begin to hear
slight distortion from the sub-
woofer. Mark or remember the
position of the Powered
Subwoofer volume knob and do
not exceed this point in subse-
quent adjustments.
4. Adjust the volume control so
that the bass level is balanced
to your taste from the listening
position.
Input Connections
Your GT Subwoofer may be
driven either with the preamp
output or speaker level output
of your source unit. The input
impedance of the GT amplifier
module is such that a “y-connec-
tor” may be used to connect your
source unit simultaneously to the
GT Subwoofer and an external
power amplifier used to drive the
main speakers when the preamp
level connection is used.
GT650P, 800P Powered Sub OM 7/15/98 10:57 AM Page 6
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