JL Audio E6450 - Manual (Page 6)

“CH 2 (Right)” inputs, the second pair of stereo
source unit outputs is connected to the
“CH 3 (Left)” and “CH 4 (Right)” inputs and the
source unit’s dedicated subwoofer output is
connected to the “CH 5 (Left)” and “CH 6 (Right)”
inputs (select “Discrete” on the “Input Mode”
switch in the “Channel 5 & 6 Controls” section).
Result: in this mode, the user has the ability to
control the absolute level of the LF channels as well
as both pairs of HF channels.
When using a source unit’s dedicated subwoofer
output, set the “Input Sens.” of any channels
receiving input from the subwoofer output with the
source unit’s subwoofer level control set at 3/4 of full
output. See Appendix A (page 12) for details.
Crossover Setup for Bi-Amplified System
with one e6450:
Once the input sections have been configured
appropriately, go to the “Channel 5 & 6 Controls”.
Select “LP” (low-pass) on the “Filter Mode” switch
and an appropriate “Filter Freq.” (100 Hz is a good
starting point).
Next, turn your attention to the “Channel 1 & 2
Controls” and “Channel 3 & 4 Controls” and
select “HP” (high-pass) on the “Filter Mode”
switches and an appropriate “Filter Freq.” (again,
100 Hz is a good starting point).
After proper adjustment of the “Input Sens.”
controls for all three channel pairs using the method
shown in Appendix A (page 12), you can fine tune
filter frequencies and attenuate any pair of channels
to achieve proper balance. For precise filter frequency
information refer to Appendix B (page 13).
I M P O RTA N T !
JL AUDIO e6450 11
SYSTEM CONFIGURATIONS
The e6450 is a flexible amplifier, well-suited for a
multitude of system configurations. In this section, the
most likely configurations are explained in detail.
Once you have selected your desired
configuration, you can use the amplifier panel
drawing on pages 16 & 17 to mark the required
switch positions for easy reference.
BI-AMPLIFIED SYSTEMS
Bi-amplified systems are defined as systems in
which separate amplifier channels drive low-frequency
(LF) and high-frequency (HF) speakers and are
separately filtered to send appropriate frequency
ranges to each speaker system.
The most common application of bi-amplification
in mobile audio is to drive a subwoofer system from
one or more amplifiers or channels and component
speakers from separate amplifiers or channels.
The e6450 is designed to work as the only
amplifier in a bi-amplified system.
BI-AMPLIFIED SYSTEM WITH THE e6450
In this configuration, channels 5&6 of the e6450 will
drive subwoofers (stereo 75W x 2 at 2 Ω or bridged
150W x 1 at 4 Ω) with low-pass filtering. Channels
1&2 and channels 3&4 will drive component speakers
in stereo (75W x 4 at 2 Ω) with high-pass filtering.
Input connection options for a bi-amplified system with
one e6450 are as follows:
A) No User Adjustability
Required: a basic source unit or processor with a
single pair of stereo outputs.
Input Connections: a single pair of stereo source
unit outputs each split with a “Y-Adaptor” allowing
the left signal to be sent to the “CH 1 (Left)” and
“CH 3 (Left)” inputs and the right signal to be sent
to the “CH 2 (Right)” and “CH 4 (Right)” inputs
of the e6450 (select “SUM” on the “Input Mode”
switch in the “Channel 5 & 6 Controls” section).
Result: the relative level of the LF and HF channels will
be fixed by the e6450’s “Input Sens.” settings and will
not be user adjustable from the front of the vehicle.
B) Fade Front vs. Rear with no Subwoofer
Level Control
Required: a basic source unit or processor with two
pairs of stereo outputs.
Input Connections: one pair of stereo source unit
outputs is connected to the “CH 1 (Left)” and “CH
2 (Right)” inputs and the second pair of stereo
source unit outputs is connected to the
“CH 3 (Left)” and “CH 4 (Right)” inputs of the
e6450 (select “SUM” on the “Input Mode” switch in
the “Channel 5 & 6 Controls” section).
Result: the relative level of the LF and HF channels will
be fixed by the e6450’s “Input Sens.” settings and will
not be user adjustable from the front of the vehicle.
C) Fade Subwoofer Level vs. HF Level
Required: a basic source unit or processor with two
pairs of stereo outputs.
Input Connections: the first stereo pair of source
unit outputs each split with a “Y-Adaptor” allowing
the left signal to be sent to the “CH 1 (Left)” and
“CH 3 (Left)” inputs and the right signal to be sent
to the “CH 2 (Right)” and “CH 4 (Right)” inputs
of the e6450.The second stereo pair of source unit
outputs is connected to the “CH 5 (Left)” and
“CH 6 (Right)” inputs (select “Discrete” on the
“Input Mode” switch in the “Channel 5 & 6
Controls” section).
Result: in this mode, the user has the ability to fade
or control the level of the LF channels relative to
the HF channels via the source unit’s fader control
without exceeding the maximum clean output level
set by each amplifier section’s “Input Sens.” controls.
D) Subwoofer Level Control Only
Required: a source unit or processor with one pair of
stereo outputs and dedicated subwoofer outputs.
Input Connections: the stereo pair of source unit
outputs each split with a “Y-Adaptor” allowing the
left signal to be sent to the “CH 1 (Left)” and “CH
3 (Left)” inputs and the right signal to be sent to the
“CH 2 (Right)” and “CH 4 (Right)” inputs of the
e6450.The source unit’s dedicated subwoofer
outputs are connected to the “CH 5 (Left)” and
“CH 6 (Right)” inputs (select “Discrete” on the
“Input Mode” switch in the “Channel 5 & 6
Controls” section).
Result: in this mode, the user has the ability to
control the absolute level of the LF channels relative
to the HF channels.
E) Independent level control of all three
channel pairs
Required: a source unit or processor with two pairs
of stereo outputs and dedicated subwoofer outputs.
Input Connections: one pair of stereo source unit
outputs is connected to the “CH 1 (Left)” and
10 JL AUDIO e6450