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TURN-ON OPTIONS
The XD1000/1v2 can be switched on and off
using one of three methods, determined by the
position of the amplifier's "Turn-On Mode"
switch. Please read these options and decide
which is best suited for your specific system.
1) +12V remote turn-on lead (preferred)
2) Signal-sensing turn-on circuit
3) DC offset-sensing turn-on circuit
+12 V Remote Turn-On: This is the preferred
method for turning the amplifier on/off. The
amplifier will turn on when +12 V is present at
its "Remote" input and turn off when +12 V is
switched off. This +12 V remote turn-on signal is
typically controlled by a source unit's remote
turn-on wire. The XD1000/1v2's "Remote" turn-
on connector will accept 18 AWG – 12 AWG
wire. To connect the remote turn-on wire to
the amplifier, first back out the set screw on the
top of the terminal block, using the supplied 2.5
mm hex wrench. Strip 1/2 inch (12mm) of wire
and insert the bare wire into the terminal block,
seating it firmly so that no bare wire is exposed.
While holding the wire in the terminal, tighten
the set screw firmly, taking care not to strip the
head of the screw and making sure that the wire
is firmly gripped by the set screw.
6 | JL Audio - XD1200/1v2 Owner's Manual
If a source unit does not have a dedicated
remote turn-on output, consider one of the
following alternative turn-on options:
These methods are useful when a conventional
+12 V remote turn-on signal is not available in a
system. These allow you to operate the amplifier
without having to locate a remote turn-on lead at
the source unit, which can be very useful when
interfacing the amplifier with OEM (factory)
audio systems that do not use conventional +12 V
turn-on leads.
Depending on the characteristics of the audio
signal, one of the following methods may work
better than the other. We recommend trying DC
Offset-Sensing first as it does not require a long
delay to turn the system off after the signal is
shut off.
DC Offset-Sensing: The amplifier will turn on
and off by detecting the presence of a very small
DC signal (offset) that is typical in the audio
output of most OEM (factory) source units and
amplifiers. The amplifier will turn on and off in
reaction to the presence or absence of this DC
Offset. The sensitivity of this circuit is designed
for high-level (speaker level) signals, not for low-
level (preamp level) signals. The circuit senses the
left-channel signal only.
Signal-Sensing: The amplifier will turn on and
off by detecting the presence of a full-range
audio signal at its left-channel input. After
approximately 30 seconds, the amplifier will shut
off. The sensitivity of this circuit is designed for
high-level (speaker level) signals, not for low-level
(preamp level) signals. The circuit is tuned to
react to signals at mid-range frequencies. This
prevents false switching from signals created by
moving loudspeakers that are in parallel with the
amplifier's input signal.
In signal and DC sensing applications, the
amplifier's "Remote" turn-on terminal becomes
a remote turn-on output. This allows the
XD1000/1v2 to turn on other amplifiers in the
audio system that do not have signal sensing.
INPUT SECTION
The XD1000/1v2 employs a differential-
balanced input topology that provides the user
with a high degree of input flexibility, while
retaining superior noise rejection. This type of
circuit also allows the XD1000/1v2 to accept high-
voltage inputs from factory source unit outputs
without excessive distortion or noise problems.
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:
Input Voltage Range: A wide range of signal
input voltages can be accommodated by the
XD1000/1v2'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
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. 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 XD1000/1v2. 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.
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