8
| JL Audio - 1000/1
v2
Owner’s Manual
9
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”:
+12VDC
Ground Remote
Preamp Output Section
Infrasonic Filter
“Q”
Center Freq.
Boost (dB)
Amp LP Filter
Advanced
Bass
Control
Amplifier Input Section
Subwoofer Output
MONO OUTPUT ONLY
Left Output
Right Output
Left Ch.
Right Ch.
Filter Freq. (Hz)
Filter Freq. (Hz)
Infrasonic Freq. (Hz)
Remote Bass Port
Full Range | Amp Filter | Out Filter
Output Mode
Filter Slope
Mode
Mode | Slope
Input Voltage
Input Sens.
Output Polarity
12dB | 24dB
Filter Mode
LP | HP
Bass EQ
Off | On
Off | 12dB | 24dB
Low | High
Normal|Reversed
Off | On
40
45
55
65
85
120
200
15
18
25
30
40
50
60
40
45
55
65
80
100
200
0.5
0.7
1.1
1.6
2.7
4.3 20
25
35
45
55
70
80
0
+4
+10
+13
+15
1000/1
v2
Monoblock Subwoofer Amplifier
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”)
filtering by way of the “Filter Mode” switch.
b) 12 dB/octave or 24 dB/ octave filter slope by
way of the “Filter Slope” switch.
c) A filter cutoff frequency between 40 - 200
Hz for the preamp output signal by way of
the “Filter Control” switch.
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.
CAUTION
!!
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.
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 1000/1v2 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.
+12VDC
Ground Remote
Preamp Output Section
Infrasonic Filter
“Q”
Center Freq.
Boost (dB)
Amp LP Filter
Advanced
Bass
Control
Amplifier Input Section
Subwoofer Output
MONO OUTPUT ONLY
Left Output
Right Output
Left Ch.
Right Ch.
Filter Freq. (Hz)
Filter Freq. (Hz)
Infrasonic Freq. (Hz)
Remote Bass Port
Full Range | Amp Filter | Out Filter
Output Mode
Filter Slope
Mode
Mode | Slope
Input Voltage
Input Sens. Signal Sensing
12dB | 24dB
Filter Mode
LP | HP
Bass EQ
Off | On
Off | 12dB | 24dB
Low | High
Off | On
Off | On
40
45
55
65
80
100
200
15
18
22
30
45
55
60
40
45
55
65
80
100
200
0.5
0.7
1.1
1.6
2.7
4.3 20
25
30
40
60
75
80
0
+4
+10
+13
+15
500/1
v2
Monoblock Subwoofer Amplifier
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.
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,
consult Appendix C: Chart A-1 (page 16)
of this manual. This chart gives you a more
accurate frequency for each of the forty
detented positions of the frequency selection
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.
