A302GTi - JBL Car Audio User Guide / Operation Manual. Page 6

Programming and Using the 
Status Monitor
In order for the status monitor to 
display the correct data, it must be
programmed. Follow the sequence
below after the amplifier(s) has been
installed. Refer to Figure 3 for the
location of the controls.
1. While pressing the Power button,

turn on the head unit.

2. Select the appropriate amplifier 

by repeatedly pressing the 
“mode” button. A601GTi is 
abbreviated as A601. A1201GTi 
is abbreviated as A12k, and 
A302GTi is abbreviated as A302.

3. Press “Power” to confirm your 

selection. The status monitor will 
display “OK”.

4. Press the “Mode” button to 

select a value that most closely 
corresponds to the nominal 
impedance of the speaker 
system connected to your amp. 
For the A302GTi, choose the 
value that corresponds to the 
impedance of either channel. 
This information must be correct 
in order for the monitor to 
correctly calculate output power.

5. Press “Power” to confirm your 

selection. The status monitor will 
display “End” to indicate that 
programming is complete.

During amplifier operation, press the
“Mode” button repeatedly to scroll
through the available information. 
The status monitor will display 
output power in Watts, input current 
in Amperes, input voltage, heatsink
temperature (measured near the 
output devices) in F° or C°. 

Setting Input Level 
Initially, turn the input level control 
to its fully counterclockwise 
position. Turn on the source unit, 
and increase the volume control 
until it is approximately 3/4 of 
maximum output level. Slowly turn 
the input level control (clockwise)
while listening to the quality of the 
reproduced sound. When you hear
distortion on the music peaks, turn
the level control back slightly. This 
is the maximum undistorted output
level of your system. Turning the 
level control up past this level WILL
NOT INCREASE THE MAXIMUM
OUTPUT POWER OF YOUR 
AMPLIFIER! It will only decrease 
the amount of volume control 
rotation before the amp is at full 
output power. It will also increase 
the amount of extraneous noise 
present in your system.

A1201GTi and A601GTi
The 24dB/octave low-pass filter built
into your A1201GTi or A601GTi can
be adjusted to any frequency between
32Hz and 320Hz. You should choose
a crossover frequency that prevents
vocals and other midrange information
from being reproduced by your 
subwoofer. Turning the knob 
counterclockwise will decrease the
crossover frequency and turning it
clockwise will increase it. 

A302GTi
The 24dB/octave crossover built into
your A302GTi can be selected as a
low-pass filter (LPF), a high-pass filter
(HPF) or it may be defeated (Flat). 
If your A302GTi will be used to drive
subwoofers, select LPF and adjust 
the crossover according to the
instructions above for the A1201GTi
and A601GTi. If your A302GTi will 
be used to drive midrange and high-
frequency speakers, you should set
the crossover as HPF and select a 
frequency that minimizes the 
distortion present in the speaker’s
output while allowing the speaker 
to produce as much low-frequency
information as it can with minimum 
distortion. Adjust the crossover 
frequency after setting the level 
control as described above. If your
A302GTi will be used to drive
midrange and high-frequency 
speakers as well as a subwoofer,
defeat the crossover (Flat).

Setting the Bass Boost 
(A601GTi and A1201GTi)
Use this control to add as much 
as 6dB of boost at 50Hz. You may 
set this control according to your
preference.

06

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