JL Audio XD 400/4v2, Owner'S Manual

Page: 7 / 20

7
Input Mode
2 Ch. | 4 Ch.
All | 3&4 1&2 | Sum
Preouts From Remote Level Mode
4 Channel Amplifier
Rem. | Offset | Signal
Input Voltage
Low | High
Turn-On Mode
If you wish to send four discrete channels into
the XD400/4, simply use all four inputs and set
the “Input Mode” switch in the “4 Ch.” position.
If you wish to use only two channels of input to
deliver signal to all four amplifier channels, set the
“Input Mode” switch to “2 Ch.” and use only the
inputs to channels 1 and 2. In this mode, channel
3 will operate with the channel 1 signal and
channel 4 will operate with the channel 2 signal.
Input Voltage Range:
A wide range of signal input voltages can
be accommodated by the XD400/4v2’s 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
This switch affects all channels of the amplifier
equally. The “Low” position on the “Input
Voltage” switch selects an input sensitivity
range between 200mV and 2V. This means that
the “Input Sens.” rotary controls 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. 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 XD400/4v2. 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 unit’s output voltage to the
input stage of the XD400/4v2 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).
Input Mode
2 Ch. | 4 Ch.
All | 3&4 1&2 | Sum
Preouts From Remote Level Mode
4 Channel Amplifier
Rem. | Offset | Signal
Input Voltage
Low | High
Turn-On Mode
To properly set the amplifier for maximum
clean output, please refer to Appendix A (page
14) 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.