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JL Audio XD400 Manual

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9
REMOTE LEVEL CONTROL OPTIONAL
With the addition of the optional Remote Level
Control (HD-RLC), you can control the volume
of one or both channel pairs of the XD400/4v2
from the front of the vehicle. This is useful for
subwoofer level control, rear channel level control,
center channel level control or even as a master
volume control for the system.
The HD-RLC connects to the jack labeled
“Remote Level Control” on the Connection
Panel of the amplifier using a standard telephone
cable (supplied with the HD-RLC). If desired,
multiple XD (and HD) amplifiers can be
controlled from a single HD-RLC controller using
a single-line, four-wire phone line splitter and
multiple phone cables.
When connected to the amplifier, the HD-RLC
operates as follows: At full counter-clockwise
rotation, the audio will mute completely. At full
clockwise rotation the level will be the same as if
the HD-RLC was not connected at all. In other
words, it operates strictly as a level attenuator.
Input Mode
2 Ch.
|
4 Ch.
All
|
3&4
1&2
|
Sum
Preouts From Remote Level Mode
4 Channel Amplifier
Rem.
|
Oset
|
Signal
Input Voltage
Low
|
High
Turn-On Mode
“Remote Level Mode” Switch: This switch allows
you to assign the operation of the HD-RLC to one
or both pairs of channels.
In the “A l l” position, the HD-RLC knob will
affect all channels equally.
In the “3&4” position, only the level of
channels 3 and 4 will be affected by the HD-RLC
knob (channels 1, and 2 will not).
PREOUTS
The XD400/4v2 incorporates a buffered, pass-
through preamp output section, so that additional
amplifiers can be easily added to the system. This
pass-through preamp output can be configured
two different ways using the switch labeled
“Preouts From”.
1) “1&2”: the preamp output delivers the same
signal that is connected to the “CH 1&2”
inputs. This mode is useful for feeding a
subwoofer amplifier when the XD400/4v2
is being used to drive front and rear speaker
systems. In this mode, the preamp output
signal will depend only on the input signal level
of “CH 1&2”, allowing channels 3&4 to
be faded without affecting the subwoofer level.
If “CH 1&2” is faded in this mode,
the signal level of the preamp output
would change accordingly.
2) “Sum”: When the XD400/4v2 is being used
to drive front and rear speaker systems, this
preamp output mode will deliver a summed
front/rear stereo signal to a subwoofer amplifier,
while permitting fading of the front and
rear speaker systems from the source unit.
This method prevents a loss of signal to the
subwoofer amplifier when the system is faded to
the front or the rear by the head unit.
Note: Any signal delay between the front and rear
channels can result in a cancellation of signals
within certain frequency ranges when using the
“Sum” position. If you experience a loss of bass
output in the “Sum” position, compared to the
“1&2” position, you are likely dealing with a
delayed signal in either the front or rear outputs
of the source unit. If the front to rear delay is
desirable for other reasons or if it cannot be
defeated at the source unit, we recommend that
you use the “1&2” position.
Note: The preamp output delivers the same signal
that is connected to the XD400/4v2’s inputs.
The preamp output signal is not affected by the
amplifier’s filter controls. If the input signal is
full-range, the preamp output will be full-range.
… 9 …


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