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JL Audio XD500 Manual

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9
2) “Filter Freq. (Hz)”
The filter frequency
markings surrounding these rotary controls
(one in each Channel Section) are for reference
purposes and are generally accurate to within
1/3 octave or better. If you would like to select
the filter cutoff frequency with a higher level
of precision, consult the chart in Appendix B
(page 15).
Tuning Hint:
If you are using the XD500/3v2
to drive a subwoofer system (“LP” mode), and
component satellite speaker systems (“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
Remote
Level
Control
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 XD500/3v2 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 single-line, four-wire 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 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.
3 Channel Amplifier
Rem.
|
Oset
|
Signal
Input Voltage
Low
|
High
Turn-On Mode
“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 XD500/3v2 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”.
3 Channel Amplifier
Rem.
|
Oset
|
Signal
Input Voltage
Low
|
High
Turn-On Mode
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.
… 9 …


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