Table of Contents
Advertisement
3) "Filter Freq. (Hz)" The filter frequency
markings surrounding this rotary control
are for reference purposes and are generally
accurate to within 1/3 octave or better. If you
would like to select the filter cutoff frequency
with a higher level of precision, consult the
charts in Appendix A (page 22) of this manual.
Preamp output section
The 450/4v2 incorporates a pass-through
preamp output section, so that additional
amplifiers can be added to the system. This pass-
through pre-amp output can be configured three
different ways using the switch labeled "Signal
From" in the "Preamp Output Section".
Preamp Output Section
CH 1 & 2 Speaker Outputs
Signal From
1 & 2 | 3 & 4 | All
Left
Right
150W
(1.5-4 )
150W
Left Output
Right Output
Bridged: 300W x 1 (3-8 )
1) "1&2": The preamp output delivers the same
signal that is connected to the 450/4v2's
CH 1&2 Inputs. This mode is useful for
feeding a subwoofer amplifier when the
450/4v2 is being used to drive front and rear
speaker systems. This preamp output mode
will track the signal level of CH 1&2, allowing
fading of the rear channels without affecting
Preamp Output Section
CH 1 & 2 Speaker Outputs
the subwoofer level.
Signal From
2) "3&4": The preamp output delivers the same
1 & 2 | 3 & 4 | All
signal that is connected to the 450/4v2's CH
3&4 Inputs. This mode is useful for feeding a
Left
150W
subwoofer amplifier when the 450/4v2 is being
Left Output
Right Output
Bridged: 300W x 1 (3-8 )
used to drive front and rear speaker systems.
This preamp output mode will track the signal
level of CH 3&4, allowing fading of the front
channels without affecting the subwoofer level.
10 | JL Audio - 450/4
Owner's Manual
v2
3) "ALL": This mode delivers a sum of the signals
being fed to the "CH 1&2 Input Section" and
"CH 3&4 Input Section" of the amplifier.
The Preamp Output signal is not affected by
the "LF Boost" or "Infrasonic Filter" processing
selected for the amplifier or by any crossover
filter selected (if the input signal is full-range,
the preamp output will be full-range). When
the 450/4v2 is being used to drive front and
rear speaker systems, this preamp output mode
will deliver a summed front/rear signal to the
subwoofer amplifier, while permitting fading
of the front and rear speaker systems from the
source unit.
CH 1 & 2 Bass Control
CH 1 & 2 Filter Section
Note: The signal level of the "Preamp Output"
Freq. Range Filter Mode | Slope
Bass EQ
Infrasonic Filter
Input Voltage
is always low level regardless of the voltage
applied to this amplifier's inputs and the
Off | On
Off | 30Hz
x1 | x10
Off | 12dB | 24dB
Low | High
setting chosen on this amplifier's "Input
95
Either
Filter Type
75
130
feature
sums the
Range" switch. A JL Audio amplifier receiving
CH 1&2 input
60
200
signals to
mono when
LP | BP | HP
50
500
signal from this preamp output should have
activated.
Remote
CH 1
Filter Freq. (Hz)
its "Input Range" switch set to "Low".
Bass Port
(Left)
CH 1 & 2 bass Control
This section provides two basic bass processing
tools for CH 1&2: a 24 dB/octave infrasonic filter
+12VDC
at 30 Hz and a +6 dB boost circuit centered at 48
Hz. Activation of either feature automatically
sums the CH 1&2 input signals to mono. (These
features should only be used when driving
subwoofer(s) from CH 1&2).
Four-Channel System Amplifier
CH 1 & 2 Bass Control
CH 1 & 2 Filter Section
Bass EQ
Infrasonic Filter
Freq. Range Filter Mode | Slope
Off | On
Off | 30Hz
x1 | x10
Off | 12dB | 24dB
95
Either
Filter Type
75
130
feature
sums the
CH 1&2 input
60
200
Right
signals to
mono when
150W
LP | BP | HP
(1.5-4 )
50
500
activated.
Remote
Filter Freq. (Hz)
Bass Port
1) "Infrasonic Filter": The infrasonic filter is a
24 dB/octave high-pass filter, with a fixed
cutoff frequency of 30 Hz. This filter is
designed to conserve amplifier power and
protect subwoofer systems without audibly
degrading the sub-bass output. 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. The
infrasonic filter can be completely defeated
by selecting the "Off" position on the
"Infrasonic Filter" switch. This bypasses all
signal from flowing through the circuit.
CH 1 & 2 Input Section
CH 3 & 4 Filter Section
CH 3 & 4 Input Section
Input Sens.
Freq. Range
High-Pass Filter
Input Voltage
2) "Bass EQ": This switch allows the user to
activate a 6 dB boost centered at 48 Hz.
x1 | x10
Off | 12dB | 24dB
Low | High
95
Input Mode
Also sets
75
130
low-pass
cutoff for
3) "Remote Bass Port": Allows you to connect an
60
200
CH 1 & 2
Bandpass
2ch | 4ch
Filter
50
500
optional remote boost knob (sold separately,
(if selected)
1 & 2
1 & 2
CH 2
CH 3
Inputs
and
HP Filter Freq. (Hz)
JL Audio Model RBC-1) that can be mounted
(Right)
(Left)
Only
3 & 4
in the front of the vehicle. With the RBC-1
connected, the boost is no longer limited to 0
or +6 dB, allowing a range of 0-15 dB of boost
to be selected.
Ground Remote
!
IMPORTANT
The "Bass EQ" and "Infrasonic Filter" features
will only operate when the CH 1&2 filter is
450/4
v2
activated and in low-pass mode. If you are
CH 1 & 2 Input Section
CH 3 & 4 Filter Section
using an external active crossover and would
Input Voltage
Input Sens.
Freq. Range
High-Pass Filter
like to use the "Bass EQ" and "Infrasonic
Low | High
Filter" features, set the "Filter Mode/Slope"
x1 | x10
Off | 12dB | 24dB
95
Input Mode
switch on "12dB" and rotate the frequency
Also sets
75
130
low-pass
cutoff for
60
200
CH 1 & 2
selection knob fully clockwise to the "500 Hz"
Bandpass
2ch | 4ch
Filter
50
500
(if selected)
position. This will activate the bass controls
1 & 2
1 & 2
CH 1
CH 2
Inputs
and
HP Filter Freq. (Hz)
(Left)
(Right)
Only
3 & 4
without significantly affecting the crossover
point selected by the external active crossover.
sPeaker outPuts
The 450/4v2 employs JL Audio's exclusive
Regulated, Intelligent Power Supply (R.I.P.S.)
design. The operation of the R.I.P.S. system is
independent for each pair of channels. This
sophisticated power supply allows the amplifier
to produce its optimum power (150 watts x 2 for
channels 1&2 and 75 watts x 2 for channels 3&4)
over a wide range of speaker impedances.
Unlike conventional amplifiers that require
a specific impedance to produce optimum
power, the R.I.P.S.-equipped 450/4v2 gives
you the freedom to use a variety of speaker
configurations that achieve final nominal
impedances between 1.5 – 4Ω per channel in
stereo (without sacrificing power output or
sound quality). When bridged, each channel
CH 3 & 4 Speaker Outputs
pair will optimize output between 3 – 8Ω.
Input Sens.
The operation of the R.I.P.S. circuitry is
entirely automatic and adjusts itself every time
the amplifier is turned on according to the
lowest impedance present at the speaker load.
Left
Right
75W
(1.5-4 )
75W
There are no user controls to configure. The
CH 4
Bridged: 150W x 1 (3-8 )
system operates through multiple stages of
(Right)
impedance optimization, choosing the stage
most appropriate to the actual impedance of the
speakers you connect to it.
Preamp Output Section
CH 1 & 2 Speaker Outputs
Signal From
1 & 2 | 3 & 4 | All
150W
CH 3 & 4 Input Section
CH 3 & 4 Speaker Outputs
Left Output
Right Output
Bridged: 300W x 1 (3-8 )
Input Voltage
Input Sens.
Low | High
Left
Right
75W
75W
(1.5-4 )
CH 3
CH 4
Bridged: 150W x 1 (3-8 )
(Left)
(Right)
CH 1 & 2 Bass Control
CH 1 & 2 F
Bass EQ
Infrasonic Filter
Freq. Range
Off | On
Off | 30Hz
x1 | x10
95
Either
75
130
feature
sums the
CH 1&2 input
60
2
Left
Right
signals to
mono when
(1.5-4 )
150W
50
50
activated.
Remote
Filter Freq. (Hz
Bass Port
11
Advertisement
Table of Contents
