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7
Remote
Level
Control
+12 VDC Ground
Remote
Mono Subwoofer Output
You may run a stereo or a mono signal into
the inputs of the amplifier. The amplifier’s input
section automatically sums stereo signals to mono
for the internal amplifier section. The amplifier
will operate with only one input connection
but will require an increase in input sensitivity
to overcome the loss of signal. If a mono input
signal is to be run, we recommend that you use
a “Y-adaptor” to split the mono signal into both
inputs of the amplifier. If you are feeding only
one input and using either the DC-Offset or
Signal Sensing “Turn-On Mode”, you must use
the left-channel input for the automatic turn-on
to operate.
Input Voltage Range:
A wide range of signal input voltages can
be accommodated by the XD600/1v2s input
section (200mV – 8V). This wide range is split
up into two sub-ranges, accessible via the “Input
Voltage” switch:
“Low: for preamp level signals
High”: for speaker level signals
The “Low” position on the “Input Voltage
switch selects an input sensitivity range between
200mV and 2V. This means that the “Input Sens.
rotary control will operate within that voltage
window. If you are using an aftermarket source
unit, with conventional preamp level outputs, this
is the position you should select.
The “High” position on the “Input Voltage”
switch selects an input sensitivity range between
800mV and 8V for all input channels. This is
useful for certain high-output preamp level
signals as well as speaker-level output from source
units and small amplifiers. To use speaker-level
sources, splice the speaker output wires of the
source unit or small amplifier onto a pair of RCA
cables or plugs or use the JL Audio ECS Speaker
Wire to RCA adaptor (XD-CLRAIC2-SW).
Line output converters are usually not needed
with the XD600/1v2. If you find that the output
cannot be reduced sufficiently with a direct
speaker level signal applied to the amplifier and
the “Input Voltage” switch in its “High” position,
you may use a line output converter or voltage
divider to reduce the signal level.
INPUT SENSITIVITY CONTROLS
The control labeled “Input Sens.” can be used
to match the source units output voltage to the
input stage of the XD600/1v2 for maximum clean
output. Rotating the control clockwise will result
in higher sensitivity (louder for a given input
voltage). Rotating the control counter-clockwise
will result in lower sensitivity (quieter for a given
input voltage).
To properly set the amplifier for maximum
clean output, please refer to Appendix A (page
12) in this manual. After using this procedure,
you can then adjust the “Input Sens.” levels
downward if this is required to achieve the
desired system balance.
Do not increase any “Input Sens.” setting for
any channel(s) of any amplifier in the system
beyond the maximum level established during
the procedure outlined in Appendix A (page
12). Doing so will result in audible distortion
and possible speaker damage.
7


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