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2
before disconnecting the
battery!
2. Run a minimum AWG #8
power cable complete with a
40 amp fuse (not included) for
the GTS300 or an AWG #6 or
AWG #4 cable with an 80 amp
fuse for the GTS600 directly
from the positive + 12V battery
terminal to the disired
amplifier location. Keep the
fuse to within 6” of the battery
terminal, and before the wire
runs through any metal
partition.
Note: All wiring connections
should be made either by
soldering with heatshrink tubing
insulation or with high quality
crimp type insulated connectors
installed with a professional type,
articulated crimping tool.
Soldering crimptype terminals is
recommended for additional
security. Never use wire-nuts,
insulation-displacement
connectors (i.e. ScotchLok type),
or “twist and tape” connections.
Do not use electrical tape; it will
loosen with age and extreme
temperatures.
3. Mount amplifier in the desired
location using four screws.
4. Connect power wiring as
shown i the Wiring Diagram.
5. Connect the outputs from the
head unit to the appropriate
inputs of the amplifier
according to the Wiring
Diagram with either high
quality low-level signal cables
with RCA plugs, with the
supplied speaker-level input
connector, or both.
6. Connect the speakers to the
amplifier according to the
wiring diagram.
7. Turn the input gain adjustment
to the 1/4 position.
8. Set the crossover switches as
desired.
9. Set the input mode switch to
stereo, left + right or right
input only operation.
10. Set the bass boost switch to
the desired position.
11. Reconnect the negative
battery cable.
12. Turn on the signal source at a
low volume level and check
for the correct output from
each speaker.
13. Adjust the amplifier gain
control using the procedure
described in the “Adjusting
the Gain” section.
2.2 Controls and Connectors
1. Preamp-Level Input Connector
–
Use these connectores for line
(preamp) level input to the
amplifier.
2. Preamp-Level Output Connector
– Use these outputs to send the
signal to additional amplifiers.
3. Speaker-Level Input Connector
–
Use this connector for speaker
level input signals. A wire harness
is supplied for use with this
connector. This input also includes
JBL’s Common Sense input
circuitry which turns the amplifier
on as soon as the high powered
head unit connected to this input
is turned on.
4. Speaker Output Connector
–
Connect speaker wiring to this
connector. See “Wiring” directions
for more information.
5., 6., 7., 8., Power Connector
–
Connection for power wires #A.
See “Wiring” directions for
information on proper
connections.