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C) Fade HF Front to Rear with Non-Fading
Subwoofer Level
Req uired: a source unit or processor with front
and rear pairs of stereo outputs.
Inp ut Connections: one stereo pair of source
unit outputs-is connected to the CH 1&2
inputs of the 450/4v2 (select "4ch" on the
"Input Mode" switch in the "CH 1&2 Input
Section"). The second stereo pair of source
unit outputs is connected to the CH 3&4
inputs of the 450/4v2. Connect the subwoofer
amplifier inputs to the preamp outputs of the
450/4v2 (Select "ALL" on the "Signal From"
switch in the "Preamp Output Section").
Res ult: with this option, the user has the ability to
fade the HF signals from front-to-rear without
fading the signal to the subwoofer amplifier.
D) Subwoofer Level Control Only
Req uired: a source unit or processor with left,
right and dedicated subwoofer outputs.
Inp ut Connections: The main stereo pair of
source unit outputs is connected to the CH
1&2 inputs of the 450/4v2 (select "2ch" on
the "Input Mode" switch in the "CH 1&2
Input Section"). The source unit's dedicated
subwoofer output is connected to the
subwoofer amplifier inputs. In this mode, the
450/4v2's preamp output is not used.
Res ult: with this option, the user has the ability
to control the absolute level of the subwoofer
channel relative to the HF channels, but
cannot fade the front and rear HF channels
relative to each other.
!
IMPORTANT
Set the CH 1&2 "Input Sens." with the source
unit's subwoofer level control set at 3/4 of full
output. See Appendix B (page 20) for details.
16 | JL Audio - 450/4
Owner's Manual
v2
E) Front to Rear HF Fading and
Subwoofer Level Control
Req uired: a source unit or processor with
front and rear pairs of stereo outputs plus a
dedicated subwoofer output.
Inp ut Connections: one stereo pair (front,
typically) of source unit outputs is connected
to the CH 1&2 inputs of the 450/4v2. The
second stereo pair of source unit outputs
(rear, typically) is connected to the CH
3&4 inputs of the 450/4v2 (select "4ch" on
the "Input Mode" switch in the "CH 1&2
Input Section"). The source unit's dedicated
subwoofer output is connected to the
subwoofer amplifier inputs. In this mode, the
450/4v2's preamp output is not used.
Res ult: with this option, the user has the ability
to fade the front and rear HF channels relative
to each other and also has the ability to
control the absolute level of the subwoofer
channel relative to the HF channels.
!
IMPORTANT
Set the CH 1&2 "Input Sens." with the source
unit's subwoofer level control set at 3/4 of full
output. See Appendix B (page 20) for details.
Crossover Setup for Bi-Amplified System with one
450/4v2 and a separate subwoofer amplifier:
Once the input and preamp output sections
have been configured appropriately, go to the
"CH 1&2 Filter Section". Select "x1" on the
"Freq. Range" switch, "HP" (high-pass) on the
"Filter Type" switch and "12dB" or "24dB" on the
"Filter Mode/Slope" switch and an appropriate
"Filter Freq." (80-90 Hz is a good starting point).
The "Infrasonic Filter" and "Bass EQ" features
cannot be used in this mode.
Next, turn your attention to the "CH 3&4
Input Section" and select "x1" on the "Freq.
Range" switch, "HP" (high-pass) on the "Filter
Type" switch and "12dB" or "24dB" on the "Filter
Mode/Slope" switch and an appropriate "Filter
Freq." (again, 80-90 Hz is a good starting point).
After proper adjustment of the 450/4v2's CH
1&2 and CH 3&4, and the subwoofer amplifier's
"Input Range" and "Input Sens.", you can fine
tune filter frequencies and slopes and attenuate
either pair of channels to achieve proper balance.
For proper adjustment of the "Input Sens."
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.
bi-amplified 3.1 system with one 450/4v2
in three-channel mode and a separate
subwoofer amplifier
This configuration requires a separate
subwoofer amplifier with a built-in low-
pass filter. All JL Audio subwoofer
amplifiers have this feature.
The separate amplifier will drive the subwoofer
system with low-pass filtering (select a filter
frequency of 80-90 Hz to start). The inputs of
the subwoofer amplifier will be connected to the
preamp outputs of the 450/4v2 or to the source
unit or multi-channel processor directly.
In this configuration, CH 1&2 of the 450/4v2
will drive front-left and front-right component
speakers (stereo 150W x 2) with high-pass
filtering. CH 3&4 will be bridged mono to drive a
center-front component speaker system (150W x
1) with high-pass filtering. All three channels will
have equal power at 3 – 4Ω.
Input connection options for bi-amplified 3.1
system with one 450/4v2 and a separate subwoofer
amplifier:
A) Real Left-Center-Right Channels and
Subwoofer with Multi-Channel Source
Req uired: a multi-channel processor or source
unit (Dolby Digital®, Dolby ProLogic II®, dts®,
etc.) with center channel output.
Inp ut Connections: the left-front and right-front
source unit outputs are connected to the CH
1&2 inputs of the 450/4v2 and the front-center
channel output of the source unit or processor
is connected to the CH 3&4 inputs of the
450/4v2 (select "4ch" on the "Input Mode"
switch in the "CH 1&2 Input Section"). Use a
"Y-adaptor" like the JL Audio ECS model XB-
CLRAICY-1F2M (sold separately) to feed both
RCA jacks on the amplifier from the single
signal cable. Most multi-channel processors
and source units are also equipped with a
dedicated subwoofer output and subwoofer
level control. Connect this subwoofer output
directly to the subwoofer amplifier's inputs.
The 450/4v2's preamp outputs are not used.
Res ult: True left, center and right channels with
multi-channel material, derived center channel
with stereo material. Rear-surround channels
are unused. User adjustability of left, center
and right channels depends on source unit/
processor. Subwoofer level is user adjustable.
!
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.
17
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