Crossover Setup for Bi-Amplified System with one
e4300M and a separate subwoofer amplifier:
Once the input and preamp output sections have
been configured appropriately, go to the
“Channel 1
& 2 Controls”
and
“Channel 3 & 4 Controls”
You
will set both control sections identically to start:
Select
“HP”
(high-pass) on the
“Filter Mode”
switch and an appropriate
“Filter Freq.”
(100 Hz is a
good starting point). (Remember to make these
adjustments to both control sections.)
After proper adjustment of the e4300M’s
“Input Sens.”
controls, and the subwoofer amplifier’s
input sensitivity controls, you can fine tune filter
frequencies and attenuate either pair of channels to
achieve proper balance. For proper adjustment of
the
“Input Sens.”
controls of the e4300M use the
method shown in Appendix A (page 14). For
precise filter frequency information for the e4300M
refer to Appendix A (page 15). Refer to the
subwoofer amplifier owner’s manual for proper
adjustments.
JL AUDIO
e4300M
13
BI-AMPLIFIED SYSTEM WITH ONE e4300M IN
FOUR-CHANNEL MODE AND A SEPARATE
SUBWOOFER AMPLIFIER
This configuration requires that the separate
subwoofer amplifier has a built-in low-pass filter. All
JL Audio amplifiers have this feature.
In this configuration, channels 1&2 of the e4300M
will drive front component speakers (stereo 75W x
2 at 2
Ω
) with high-pass filtering. Channels 3&4 will
drive rear component speakers in stereo (75W x 2
at 2
Ω
), also with high-pass filtering.
The separate amplifier will drive the subwoofer
system with low-pass filtering (100 Hz is a good
starting point).
Input connection options for a bi-amplified system
with one e4300M and a separate subwoofer
amplifier are as follows:
A) No User Adjustability
Required:
a basic source unit or processor with one
pair of stereo outputs.
Input Connections:
a single pair of stereo source
unit outputs is connected to the
“CH 1 (Left)”
and
“CH 2 (Right)”
inputs of the e4300M (select
“1&2”
on the
“CH 3&4 Input From”
switch). Connect the
subwoofer amplifier inputs to the preamp outputs
of the e4300M (Select
“1&2”
on the
“Pre-Outs
Input From”
switch. Alternatively, the e4300M can
receive its input from the subwoofer amplifier’s
preamp output set to “full-range” mode.
Result:
the relative level of the LF and front and rear
HF channels will be fixed by the e4300M’s
“Input
Sens.”
settings (as well as the subwoofer amplifier’s
settings) and will not be user adjustable from the
front of the vessel.
B) Fade Subwoofer Level vs. HF Level
Required:
a source unit or processor with front and
rear pairs of stereo outputs.
Input Connections:
one stereo pair of source unit
outputs is connected to the
“CH 1 (Left)”
and
“CH 2 (Right)”
inputs of the e4300M (select
“1&2”
on the
“CH 3&4 Input From”
switch).The second
stereo pair of source unit outputs is connected to
the subwoofer amplifier inputs.
Result:
with this option, the user has the ability to
fade the level of the subwoofer amplifier’s input
relative to the HF channels, but cannot control
front-to-rear fading of the HF channels.The relative
level of the front and rear HF channels will be fixed
by the e4300M’s
“Input Sens.”
settings and will not
be user adjustable from the front of the vessel.
C) Subwoofer Level Control Only
Required:
a source unit or processor with left, right
and dedicated subwoofer outputs.
Input Connections:
The main stereo pair of source
unit outputs is connected to the
“CH 1 (Left)”
and
“CH 2 (Right)”
inputs of the e4300M (select
“1&2”
on the
“CH 3&4 Input From”
switch).The source
unit’s dedicated subwoofer output is connected to
the subwoofer amplifier inputs.
Result:
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.
Set the subwoofer amplifier’s
“Input Sens.”
with
the source unit’s subwoofer level control set at 3/4
of full output.
D) Front to Rear HF Fading and Subwoofer
Level Control
Required:
a source unit or processor with front and
rear pairs of stereo outputs plus a dedicated
subwoofer output.
Input Connections:
one stereo pair of source unit
outputs is connected to the
“CH 1 (Left)”
and
“CH 2 (Right)”
inputs of the e4300M. The second
stereo pair of source unit outputs is connected to
the
“CH 3 (Left)”
and
“CH 4 (Right)”
inputs of the
e4300M (select
“Discrete”
on the
“CH 3&4 Input
From”
switch).The source unit’s dedicated
subwoofer output is connected to the subwoofer
amplifier inputs.
Result:
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.
Set the subwoofer amplifier’s
“Input Sens.”
with
the source unit’s subwoofer level control set at 3/4
of full output.
I M P O RTA N T
!
I M P O RTA N T
!
12
JL AUDIO
e4300M
