JL Audio NexD XD500/3 Owner's Manual page 9

Tuning Hint: If you are using the XD500/3
to drive a subwoofer system ("LP" mode),
and a component satellite speaker system
("HP" mode), 80 Hz is a good baseline
"Filter Freq. (Hz)" setting. After properly
adjusting the "Input Sens.", as outlined in
Appendix A (page 14), you can fine tune
the "Filter Freq. (Hz)" control to achieve
the desired system frequency response.
remote leVel control (oPtional)
( L )
R )
CH. 1&2 SUB CH. Preouts
INPUT SECTION
With the addition of the optional Remote
Level Control (HD-RLC), you can control the
volume of the subwoofer channel (Subwoofer
Level) or of the entire XD500/3 from the front of
the vehicle (Master Volume).
The HD-RLC connects to the jack labeled
"Remote Level Control" on the Connection Panel
of the amplifier using a standard telephone cable
(supplied with the HD-RLC). If desired, multiple
XD (and HD) amplifiers can be controlled from
a single HD-RLC controller using a simple phone
line "splitter" and multiple phone cables.
When connected to the amplifier, the
HD-RLC operates as follows. At full counter-
clockwise rotation, the audio of the selected
channels will mute completely. At full clockwise
rotation the level will be the same as if the
HD-RLC was not connected at all. In other
words, it operates strictly as a level attenuator.
Remote
Level
Control
CH. 1
( L )
Bridged
"Remote Level Mode" Switch: This switch
allows you to assign the operation of the
HD-RLC to the entire amplifier or only the
subwoofer channel. In the "All" position, the
HD-RLC knob will affect all channels equally.
In the "Sub Ch." position, only the level of
the subwoofer channel will be affected by the
HD-RLC knob.
Preouts
The XD500/3 incorporates a pass-through
preamp output section, so that additional
amplifiers can be easily added to the system. This
pass-through pre-amp output can be configured
three different ways using the switch labeled
"Preouts From".
CH. 2
( R )
Mono Subwoofer Output
1) "1&2": The preamp output delivers the same
signal that is connected to the CH 1&2 Inputs.
2) "Sub": The preamp output delivers the same
signal that is connected to the Subwoofer
Channel Inputs.
3) "Sum": The preamp output delivers a summed
signal, combining the "Ch 1 & 2" inputs and the
"Sub Ch." inputs into a stereo signal pair.
Note: Any signal delay between the "Ch 1 & 2"
and "Sub Ch." inputs can result in a cancellation
of signals within certain frequency ranges when
using the "Sum" position. If you experience a loss
of bass output in the "Sum" position, compared
to the "1&2" position, you are likely dealing
with a delayed signal in either the front or rear
outputs of the source unit. If the front to rear delay
is desirable for other reasons or if it cannot be
defeated at the source unit, we recommend that
you use the "1&2" position.
Note: In any of the three modes, the preamp
output signal is not affected by any crossover
filter selected (if the input signal is full-range, the
preamp output will be full-range).
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