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.
