JL Audio XD400/4 - Handbuch (Seite 6)

6 | JL Audio - XD400/4 Owner’s Manual
turn-on lead
The XD400/4 uses a conventional +12V remote
turn-on lead, typically controlled by the source
unit's remote turn-on output. The amplifier will
turn on when +12V is present at its “Remote”
input and turn off when +12V is switched off. If
a source unit does not have a dedicated remote
turn-on output, the amplifier’s turn-on lead can
be connected to +12V via a switch that derives
power from an ignition-switched circuit.
The XD400/4’s “Remote” turn-on connector
is designed to 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 2.5mm 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 (not the
insulation) is firmly gripped by the set screw.
inPut section
The XD400/4’s input section allows you to
send signals to the amplifier section through the
use of two or four differential-balanced inputs.
Input connections are via up to two pairs of
traditional RCA-type jacks.
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 & 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:
The XD400/4’s input sections are designed to
accept signal voltages from 100mV – 4V. This
will accommodate all preamp level signals and
many speaker level signals.
To use speaker-level sources, simply splice the
speaker output wires of the source unit onto a
pair of RCA plugs for each input pair. (or use JL
Audio part XD-CLRAIC2-SW) No “line output
converter” is needed in most cases.
If you find that the output cannot be reduced
sufficiently with a direct speaker level signal
applied to the amplifier, you may use a “line
output converter” to reduce the signal level.