JL Audio 450/4V2 Stereo Amplifier User Manual


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20 | JL Audio - 450/4v2 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 Connec tions: one stereo pair of source
unit outputs is connected to the CH 1&2
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iInput ModewTXJUDIJOUIFiCH 1&2 Input
SectionwBOEUIFTPVSDFVOJUTEFEJDBUFE
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.
IMPORTANT
!
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
CFFODPOGJHVSFEBQQSPQSJBUFMZHPUPUIFiCH 1&2
Filter SectionwPGUIFW5IFTFTFUUJOHT
will determine the high-pass cutoff and slope of
the bandpass filtering applied to the MF (mid-
GSFRVFODZDIBOOFMT4FMFDUix1wPOUIFiFreq.
RangewTXJUDIiBPwCBOEQBTTPOUIFiFilter
TypewTXJUDIBOEi12dBwPSi24dBwPOUIF
iFilter Mode/SlopewTXJUDIBOEBOBQQSPQSJBUF
iFilter Freq.w)[JTBHPPETUBSUJOHQPJOU
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cannot be used in this mode.
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Input Sectionw5IFTFTFUUJOHTXJMMEFUFSNJOF
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.
4FMFDUix1wPOUIFiFreq. RangewTXJUDIJGZPVS
desired MF to HF crossover frequency is below
)[4FMFDUix10wPOUIFiFreq. RangewTXJUDI
if your desired MF to HF crossover frequency
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iFilter TypewTXJUDIBOEi12dBwPSi24dBw
POUIFiFilter Mode/SlopewTXJUDIBOEBO
BQQSPQSJBUFiFilter Freq.w
After proper adjustment of the 450/4v2’s CH
1&2 and CH 3&4, and the subwoofer amplifier’s
iInput RangewBOEiInput Sens.wZPVDBOGJOF
tune filter frequencies and slopes and attenuate
the LF, MF and HF channel pair or with the
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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 Connec tions: a single pair of stereo
source unit outputs is connected to the CH
JOQVUTPGUIFWTFMFDUi2chwPO
UIFiInput ModewTXJUDIJOUIFiCH 1&2
Input Sectionw4VCXPPGFSBNQMJGJFSJOQVUT
are connected to the preamp outputs of the
W4FMFDUi1&2wPOUIFiSignal Fromw
TXJUDIJOUIFiPreamp Output Sectionw
Res ult: the relative level of all channels will be
GJYFECZUIFWTiInput Sens.wTFUUJOHT
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 Connec tions: one stereo pair of source
unit outputs is connected to the CH 1&2
JOQVUTPGUIFWTFMFDUi2chwPOUIF
iInput ModewTXJUDIJOUIFiCH 1&2 Input
SectionwBOEUIFTFDPOETUFSFPQBJSPGTPVSDF
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
BNQMJGJFSTFDUJPOTiInput Sens.wDPOUSPMT
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