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10 | JL Audio - 600/1v3 Owner’s Manual
11
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.
ADVANCED BASS CONTROL SECTION
The 600/1v3 includes a versatile bass
processing section consisting of two
primary components: a fully variable,
24 dB per octave infrasonic filter and a
parametric, single-band equalizer.
Infrasonic Filter
“Q” Center Freq. Boost (dB)
Advanced
Bass
Control
Infrasonic Freq. (Hz) Remote Bass Port
Mode
Bass EQ
Off
|
On
Off
|
On
15
18
22
30
45
55
60
0.5
0.7
1.1
1.6
2.7
4.3
20
25
30
40
60
75
80 0
+4
+10
+13
+15
1) “Infrasonic Filter”: The infrasonic filter is a
24 dB/octave high-pass filter, with a fully
variable cutoff frequency between 15 - 60 Hz.
When set at frequencies lower than 30 Hz, it
conserves amplifier power without audibly
affecting the quality of the sub-bass output. If
set at frequencies higher that 30 Hz, there will
be an audible effect, but one which may be
desirable for SPL competition purposes or curve
shaping of a bottom-heavy system. With ported
enclosures, the use of the infrasonic filter is
highly recommended to protect the speaker(s)
from excessive excursion below box tuning.
With sealed enclosures, the use of the filter is
less necessary, but can still help protect the
speaker system. If you would like to select the
infrasonic filter frequency with a higher level of
precision, consult Appendix C: Chart A-3 (page
17) of this manual. The infrasonic filter can be
completely defeated by selecting the “Off”
position on the “Mode” switch. This bypasses
all signal from flowing through the circuit.
2) Parametric Bass Equalizer: The parametric
equalizer allows the user to select the center
frequency of the boost band as well as the
bandwidth (“Q”) of the boost band. The “Q"
control selects the bandwidth of the boost
around the center frequency. Lower numbers
pertain to wider bandwidths while higher
number pertain to narrower bandwidths.
The “Center Freq.” control selects the center
frequency of the boost bandwidth within
a range of 20 - 80 Hz. If you would like to
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 11 for
details). With the internal crossover turned off,
the 600/1v3’s upper frequency response limit is
250 Hz, due to its bass-specific Class D design.
PREAMP OUTPUT SECTION
The 600/1v3 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. Signal Sensing
12dB
|
24dB
Filter Mode
LP
|
HP
Bass EQ
Off
|
On
Off
|
12dB
|
24dB Low
|
High Off
|
OnOff
|
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
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 600/1v3’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 600/1v3’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.
… 6 …

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