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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
+12VDC
Ground Remote
frequencies it is well-suited for, resulting in
reduced distortion and improved fidelity.
amPliFier low-Pass Filter
1000/1
v2
The 1000/1v2 employs a sophisticated, state-
Monoblock Subwoofer Amplifier
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.
Amp LP Filter
Amplifier Input Section
Center Freq.
Boost (dB)
40
+10
Mode | Slope
Input Voltage
Input Sens.
Signal Sensing
30
60
+4
+13
75
Off | 12dB | 24dB
Low | High
20
80
0
+15
65
55
80
Advanced
Bass
45
100
Control
40
200
mote Bass Port
Filter Freq. (Hz)
Left Ch.
Right Ch.
1) Filter Operation: The low-pass filter in the
1000/1v2 is fully variable between 40 Hz and
200 Hz via the "Filter Freq." control knob
and features the ability to select between a
moderate "12dB" per octave or a steep "24dB"
per octave slope via the "Mode/Slope" switch.
Depending on the subwoofer system and the
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.
8 | JL Audio - 1000/1
Owner's Manual
v2
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.
The above hint is not "set-in-stone"...
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.
2) Precise Frequency Selection: The filter
frequency markings on the front panel of
the amplifier are for reference purposes and
are generally accurate to within 1/3 octave
or better. If you would like to select the filter
frequency with a higher level of precision,
Subwoofer Output
consult Appendix C: Chart A-1 (page 16)
of this manual. This chart gives you a more
Off | On
accurate frequency for each of the forty
detented positions of the frequency selection
MONO OUTPUT ONLY
control. This method can be very useful if the
amplifier is mounted in a location where you
can't see the front panel markings easily.
3) Defeating the Amplifier Filter: The Low-
Pass filter can also be defeated completely,
by switching the "Mode/Slope" switch to the
"Off" position. This is useful if you are using
an external active crossover in the system.
Keep in mind that turning the internal
crossover off also defeats the "Advanced Bass
Control" section processing (see page 9 for
details). With the internal crossover turned
off, the 1000/1v2's upper frequency response
limit is 250 Hz, due to its bass-specific
Class D design.
PreamP outPut seCtion
The 1000/1v2 incorporates a flexible preamp
output section, designed to make multiple
amplifier systems easy to set up.
The Preamp output can be configured in three
different "Output Modes":
Preamp Output Section
Infrasonic Filter
Output Mode
Filter Slope
Mode
Full Range | Amp Filter | Out Filter
12dB | 24dB
Off | On
65
Filter Mode
55
85
25
45
120
18
LP | HP
40
200
15
Left Output
Right Output
Filter Freq. (Hz)
Infrasonic Freq. (Hz)
1) "Full-Range": This is a pass-through mode
for the preamp output, delivering the same
signal that is being fed to the "Amplifier Input
Section" (If the input signal is full-range,
the preamp output will be full-range). This
signal is not affected by the "Advanced Bass
Control" processing selected for the amplifier.
2) "Amp Filter": The preamp output delivers
the same signal that is feeding the 1000/1v2's
amplifier section, including all the processing
induced by the "Amp LP Filter" and
"Advanced Bass Control" sections. This
is primarily used for running additional
1000/1v2's in a "Slave" configuration
from the "Master" amplifier. For detailed
information on "Master/Slave" configurations,
see Appendix D (page 18). If the "Output
Mode" switch is in the "Amp Filter"
position and the "Amp LP Filter" switch
is in the "Off" position, there will be no
output from the preamp output jacks. The
independent output filter controls ("Filter
Slope", "Filter Freq" and "Filter Mode")
are inactive in "Amp Filter" mode.
3) "Out Filter": The preamp output is
filtered by a fully variable, active filter
incorporated into the output section
and is not affected by the bass control
processing selected for the amplifier. In
"Out Filter" mode, the user can select:
a) High-pass ("HP") or low-pass ("LP")
Amp LP Filter
Amplifier Input Section
"Q"
Center Freq.
Boost (dB)
1.6
45
+10
filtering by way of the "Filter Mode" switch.
Mode | Slope
Input Voltage
1.1
2.7
35
55
+4
+13
b) 12 dB/octave or 24 dB/ octave filter slope by
0.7
25
70
Off | 12dB | 24dB
Low | High
0.5
4.3 20
80
0
+15
way of the "Filter Slope" switch.
30
65
Bass EQ
40
55
80
c) A filter cutoff frequency between 40 - 200
Advanced
Bass
50
45
100
Hz for the preamp output signal by way of
Control
Off | On
60
40
200
the "Filter Control" switch.
Remote Bass Port
Filter Freq. (Hz)
This is completely independent of the
amplifier's internal filter and allows the user to
match, stagger or overlap the subwoofer low-pass
filter frequency of the amplifier crossover with
the output filter's frequency for precise control
and optimized midbass performance.
If you would like to select the filter frequency
with a higher level of precision, consult
Appendix C: Chart A-2 (page 16) of this manual.
!!
CAU T I ON
The signal level of the "Preamp Output" is
always low level regardless of the voltage
applied to this amplifier's inputs and the
setting chosen on this amplifier's "Input
Range" switch. All "Slave" amplifiers should
have their switches set to "Low". See Appendix
D (page 18) for details.
Input Sens.
Output Polarit
Normal|Revers
Left Ch.
Right Ch.
9
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