JL Audio XD600/1v2 オーナーマニュアル

6  |  JL Audio - XD600/1v2 Owner’s Manual  

The XD600/1v2 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 
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 XD600/1v2’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.

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 sensing and DC offset sensing 

applications, the amplifier’s “Remote” turn-on 
terminal becomes a remote turn-on output. 
This allows the XD600/1v2 to turn on other 
amplifiers in the audio system that do not have 
signal sensing or DC offset sensing. Of course, 
the XD600/1v2 must be the first amplifier in the 
signal path for this to function properly.

The XD600/1v2 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 XD600/1v2 to accept high-
voltage inputs from factory source unit outputs 
without excessive distortion or noise problems.