Remote Level Control Optional - JL Audio M400/4-24V Owner's Manual

REMOTE LEVEL CONTROL OPTIONAL

With the addition of the optional Remote
Level Control (HD-RLC or MHD-RLC),
you can control the volume of one, or both
channel pairs of the M400/4-24V from a
location of your choosing. This is useful for
subwoofer level control, cabin speaker level
control, zone volume control or even as a
master volume control for the entire 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 simple 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.
"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 "All" position, the HD-RLC knob will affect
all three channel pairs equally. In the "3&4"
position, only the level of channels 3 and 4 will
be affected by the HD-RLC knob (Channels 1 &
2 will not).
PREOUTS
The M400/4-24V incorporates a pass-through
preamp output section, so that additional
amplifiers can be easily added to the system. This
pass-through pre-amp 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 M400/4-24V 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 will change accordingly.
2) "Sum": When the M400/4-24V 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: In either mode, the preamp output signal is
not affected by any crossover filter selected (if the
input signal is full-range, the preamp output will
be full-range).
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