20
| JL Audio - 450/4
v2
Owner’s Manual
21
C) Subwoofer Level Control Only
Req uired
: a source unit or processor
with left, right and dedicated
subwoofer outputs is required.
Inp ut Connections
: one stereo pair of source
unit outputs is connected to the CH 1&2
JOQVUTPGUIFW TFMFDUi
2ch
wPOUIF
i
Input Mode
wTXJUDIJOUIFi
CH 1&2 Input
Section
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subwoofer output is connected to the
subwoofer amplifier inputs. In this mode, the
450/4v2’s preamp output is not used.
Res ult
: the user has the ability to control the
absolute level of the subwoofer channel
relative to the MF and HF channels.
I M P O RTA N T
!
Set the subwoofer amplifier’s “Input
Sens.” with the source unit’s subwoofer
level control set at 3/4 of full output.
Refer to the subwoofer amplifier owner’s
manual for proper adjustment.
Crossover setup for tri-amplified 3.1 system with
one 450/4v2 and a separate subwoofer amplifier:
Once the input and preamp output sections have
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CH 1&2
Filter Section
wPGUIFW5IFTFTFUUJOHT
will determine the high-pass cutoff and slope of
the bandpass filtering applied to the MF (mid-
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x1
wPOUIFi
Freq.
Range
wTXJUDIi
BP
w CBOEQBTTPOUIFi
Filter
Type
wTXJUDIBOEi
12dB
wPSi
24dB
wPOUIF
i
Filter Mode/Slope
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i
Filter Freq.
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5IFi
Infrasonic Filter
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Bass EQ
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cannot be used in this mode.
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CH 3&4
Input Section
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the high-pass cutoff and slope of the high pass
filtering applied to the HF (high-frequency)
channels as well as the low-pass cutoff frequency
and slope for the MF channels’ bandpass filter.
4FMFDUi
x1
wPOUIFi
Freq. Range
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desired MF to HF crossover frequency is below
)[4FMFDUi
x10
wPOUIFi
Freq. Range
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if your desired MF to HF crossover frequency
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HP
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i
Filter Type
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12dB
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24dB
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Filter Mode/Slope
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Filter Freq.
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After proper adjustment of the 450/4v2’s CH
1&2 and CH 3&4, and the subwoofer amplifier’s
i
Input Range
wBOEi
Input Sens.
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tune filter frequencies and slopes and attenuate
the LF, MF and HF channel pair or with the
i
Input Sens.
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Input Sens.
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controls of the 450/4v2 use the method shown in
Appendix B (page 22). For precise filter frequency
information for the 450/4v2 refer to Appendix
A (page 22). Refer to the subwoofer amplifier
owner’s manual for proper adjustments.
TRI-AMPLIFIED SYSTEMS
Tri-amplified systems are defined as systems
in which separate amplifier channels drive
low-frequency (LF), mid-frequency (MF) and
high-frequency (HF) speakers and are separately
filtered to send appropriate frequency ranges to
each speaker system.
The most common application of tri-
amplification in mobile audio is to drive a
subwoofer system from one or more amplifiers
or channels (LF channels), mid-range speakers
from a separate amplifier or set of channels
(MF channels) and high-frequency speakers
from a separate amplifier or set of channels
(HF channels). One such configuration is to
run subwoofers off the LF channel(s), mid-
bass speakers off the MF channels, and a
passively crossed over mid/high frequency
component speaker systems on the HF channels.
Another approach is to run subwoofers off the
LF channel(s), mid-woofers off the MF channels
and tweeters off the HF channels (all actively
crossed over).
By activating the CH 1&2 bandpass filter
feature, the 450/4v2 can easily be configured
to drive a tri-amplified system in conjunction
with a separate subwoofer amplifier that
includes a low-pass filter. CH 3&4 of the
450/1 will drive the HF speakers (75W x 2),
CH 1&2 will drive the MF speakers (150W
x 2) and the separate subwoofer amp(s)
will drive the LF speakers (subwoofers).
Input connection options for the Tri-Amplified
Stereo mode are as follows:
A) No User Adjustability
Req uired
: a basic source unit or processor with
left and right stereo outputs.
Inp ut Connections
: a single pair of stereo
source unit outputs is connected to the CH
JOQVUTPGUIFW TFMFDUi
2ch
wPO
UIFi
Input Mode
wTXJUDIJOUIFi
CH 1&2
Input Section
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are connected to the preamp outputs of the
W 4FMFDUi
1&2
wPOUIFi
Signal From
w
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Preamp Output Section
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Res ult
: the relative level of all channels will be
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Input Sens.
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and will not be user adjustable from the front
of the vehicle.
B) Fade Subwoofer Level vs. MF/HF Level
Req uired
: a source unit or processor with front
and rear pairs of outputs is required.
Inp ut Connections
: one stereo pair of source
unit outputs is connected to the CH 1&2
JOQVUTPGUIFW TFMFDUi
2ch
wPOUIF
i
Input Mode
wTXJUDIJOUIFi
CH 1&2 Input
Section
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unit outputs is connected to the subwoofer
amplifier inputs. In this mode, the 450/4v2’s
preamp output is not used.
Res ult
: the user has the ability to adjust the level
of the subwoofer channel relative to the mid
and high-frequency channels via the source
unit’s fader control, without exceeding the
maximum clean output level set by each
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Input Sens.
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