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JBL gto 601 1 ii Manual

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6
INSTALLATION AND SETUP
SETTING THE
CROSSOVER(S)
Determine your system plans and set the
crossover mode switch accordingly. If
you plan to use the GTO75.2 II or GTO75.4II
to drive full-range speakers, set the
crossover mode to FLAT and skip to
“Setting Input Sensitivity.”
Initially set the crossover frequency
control midway. While listening to music,
adjust the crossover for the least
perceived distortion from the speakers,
allowing them to reproduce as much
bass as possible.
Systems using a separate subwoofer set
the crossover mode to HP (high pass) for
your full-range speakers. Adjust the
crossover frequency to limit bass and
provide increased system volume with
less distortion.
For subwoofers, choose the highest
frequency that removes vocal information
from the sound of the subwoofer.
If using the GTO75.2
II or GTO75.4 II to drive
a subwoofer(s), set the crossover mode to
LP (low pass).
NOTE: The GTO301.1II, GTO601.1II,
GTO1201.1II and the subwoofer output of
the GTO755.6 II are low-pass only and do
not have a crossover mode switch.
SETTING INPUT
SENSITIVITY
1. Initially turn the INPUT LEVEL control(s)
to minimum (counter clockwise).
2. Reconnect the (–) negative lead to the
vehicle’s battery. Apply power to the
audio system and play a dynamic music
track.
3. On the source unit, increase the volume
control to 3/4 volume. Slowly increase
the INPUT LEVEL control(s) toward three
o’clock until you hear slight distortion
in the music. Then reduce the INPUT
LEVEL slightly until distortion is no
longer heard.
NOTE: After the source unit is on, red LEDs
(on the top panel) will light, indicating the
amplifier is on. If not, check the wiring,
especially the remote connection from the
source unit. Also refer to “Troubleshooting”
on the next page.
REMOTE LEVEL CONTROL
The GTO755.6 II and all three GTO
subwoofer amplifiers have inputs for
an optional remote level control (RLC).
This will allow the amplifier’s input level
to be adjusted from the listening position.
Connect the optional remote level control
using the RJ-11 jack on the side of the
amplifier. Install the control module in the
front of the vehicle within easy reach of
the driver. Under the dash or in the center
console are both suitable locations.
SETTING THE BASS BOOST
The GTO755.6 II, GTO301.1II, GTO601.1II and
GTO1201.1II are all equipped with a bass-
boost control. This allows you to adjust the
bass output of your system at 50Hz up to
12dB and enhance low frequency.
AUX OUTPUT
GTO amplifiers (except GTO755.6 II) are
equipped with full-range outputs that can
be used to connect additional amplifiers.
NOTE: When using the high-level inputs,
the AUX outputs can be used to pass a
line-level signal to another amplifier.
INSTALLING NEON TUBES
(OPTIONAL)
1. Using a Phillips screwdriver, remove all
screws on the amplifier’s output/power
end panel and set them aside.
2. Using a 3⁄32-inch Allen wrench, remove
only the screws on the amplifier’s (top)
clear cover and set them aside.
3. Remove the end panel and slide the
cover off. Set both parts aside.
4. Locate the enclosed hardware bag and
remove the four clips. Each clip has a
square end and a larger round end.
Using a round end, press two clips onto
each neon tube (e.g., Street Glow AN9
or equivalent), as shown in
Figure 13.
5. For each tube, align both clips so the
square ends slide onto an exposed
extrusion edge, as shown in Figure 9.
Do not cover any screw holes. When
installed correctly, each neon tube will
sit under an extrusion and not be visible
when viewed from directly above.
6. Route each neon tube’s power cable
through its respective NEON hole on the
end panel (see
Figure 13).
7. Slide the cover back into place and re-
install its screws. Then, replace the end
panel and reinstall its screws.
8. Finish the installation of the neon tubes
as instructed in their owner’s manual.
Figure 12. Control end panel.
GTO75.2
II
GTO75.4 II
GTO301.1II, GTO601.1II, GTO1201.1II
GTO75.6 II
6


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