Owner's Manual
Table Of Contents
Next,
turn
your attention to the
"Channell
&
2
Controls"
and
select
"HP"
(high-pass) on
the
"Filter
Mode"
switch
and
an appropriate
"Filter
Freq." (again, 80
Hz
is
a good starting point).
After
proper
adjustment
of
the
"Input
Sens."
controls for
both
channel pairs using the
method
shown
in
Appendix A (page
14),
you can fine
tune
filter frequencies
and
attenuate either
pair
of
channels to achieve proper balance. For precise
filter frequency information refer to Appendix B
(page
15).
Bi-Amplified
System
with
one
M4300
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 M4300
will drive front
component
speakerswith high-
pass filtering.
Channels
3&4 will drive
rear
component
speakers
in
stereo, also with
high-pass filtering. The separate amplifier
will drive
the
subwoofer system with low-pass
filtering (80
Hz
is
a good
starting
point).
Input connection options for a bi-amplified
system with one M4300 and a separate sub woofer
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 M4300
(select "1&2"
on
the
"CH
3&4
Input
From"
switch). Connect the subwoofer amplifier
inputs to the preamp outputs
of
the M4300
(Select "1&2" on the
"Pre-Outs
Input
From"
switch. Alternatively, the M4300 can receive its
input from the subwoofer amplifier's preamp
output set to
"full-range"
mode (ifapplicable).
Result: the relative level
of
the
LF
and
front
and
rear
HF
channels will be fixed by the
M4300's
"Input
Sens." settings (as well as the
subwoofer amplifier's settings)
and
will not be
user adjustable from the front
of
the vehicle.
12
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 M4300
(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 M4300's
"Input
Sens." settings
and
will not be user
adjustable from the front
of
the vehicle.
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
M4300 (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.
DIMPORTANTI
Set
the
subwoofer
amplifier's
"Input
Sens,"
with
the
source
unit's
subwoofer
level
control
set
at
3/4
of
full
output.
..JL
AUDIO
M4300