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8  |  JL Audio - 600/1
v3
 Owner’s Manual  
9
CROSSOVER CONTROLS
Crossovers are groups of individual electronic 
filters which allow only certain frequency 
ranges to pass through them by attenuating 
frequencies outside the selected range. These 
filters allow the user to specify what frequency 
range will be sent out of each channel section 
of the amplifier. This, in turn, allows each 
speaker system to only reproduce a range of 
frequencies it is well-suited for, resulting in 
reduced distortion and improved fidelity.
 
AMPLIFIER LOW-PASS FILTER
The 600/1v3 employs a sophisticated, state-
variable, low-pass active filter for its internal 
channel. This feature is designed to attenuate 
frequencies above its filter frequency, so that the 
system’s subwoofers do not reproduce any audible 
midrange content.
(dB)
Amp LP Filter
nced
rol
A
Left C
Filter Freq. (Hz)
Mode | Slope
Input Vo
Off | 12dB | 24dB
Low | H
40
45
55
65
80
100
200
0
+13
+15
 
1)  Filter Operation: The low-pass filter in the 
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and features the ability to select between a 
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vehicle, different slopes may be required to 
produce a smooth transition to the mid-bass 
speakers in the system. Experiment to find 
the slope which best matches the acoustic 
requirements of your system.
 
Tuning Hint
:
 A trunk mounted sub whose output 
has to "fight" through a rear deck or a back seat 
often benefits from the 12 dB/octave slope which 
lets more upper bass content pass through. A sub 
that fires directly into the listening environment 
is more likely to benefit from a 24 dB/octave slope.
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You should always listen to the system carefully to 
determine the best choice as vehicle acoustics and 
other factors play a big role in choosing the most 
appropriate filter slope. 
ranges, accessible via switches located in the 
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switch selects an input sensitivity range 
between 200mV and 2V.  This means that 
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within that voltage window. If you are using 
an aftermarket source unit, with conventional 
preamp-level outputs, this is most likely the 
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sensitivity range between 800mV and 8V.  This 
is useful for certain high-output preamp level 
signals as well as speaker-level output from 
source units and small amplifiers. To use 
speaker-level sources, splice the speaker output 
wires of the source unit or small amplifier  
onto a pair of RCA cables or plugs or use the  
JL Audio ECS Speaker Wire to RCA adaptor 
9%$-3"*$48
 
I M P O R TA N T
!
 
The output of the amplifier will decrease  
for a given input voltage when the “Input 
Range” switch is placed in the “High” position. 
Conversely, the output will be higher with  
the switch in the “Low” position. While this 
may sound counter-intuitive, it is correct  
as described.
 
3)  Input Sensitivity Adjustment: Located 
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rotary control can be used to match the source 
unit’s output voltage to the input stage of the 
amplifier for maximum clean output. Rotating 
the control clockwise will result in higher 
sensitivity (louder for a given input voltage). 
Rotating the control counter-clockwise will 
result in lower sensitivity (quieter for a given 
input voltage). To properly set the amplifier 
for maximum clean output, please refer to 
Appendix A (page 14) in this manual. After 
using this procedure, you can then adjust 
the level of the amplifier by adjusting the 
input sensitivity downward, if the amplifier 
requires attenuation to achieve the desired 
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beyond the maximum level established during 
the procedure outlined in Appendix A (page 
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and possible speaker damage.