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12 | JL Audio - XD700/5 Owner’s Manual
SYSTEM CONFIGURATIONS
The XD700/5 is a very flexible amplifier, well-
suited for a multitude of system configurations. In
this section, the most likely configurations for a
system with a single XD700/5 are explained in detail.
Once you have selected your desired
configuration, you can use the amplifier panel
drawing on pages 18 & 19 to mark the required
switch positions for easy reference.
BIAMPLIFIED SYSTEMS
Bi-amplified systems are defined as systems
in which separate amplifier channels drive low-
frequency (LF) and high-frequency (HF) speakers
and are separately filtered to send appropriate
frequency ranges to each speaker system.
The most common application of
bi-amplification in mobile audio is to drive a
subwoofer system from one or more amplifiers or
channels and component speakers from separate
amplifiers or channels.
The XD700/5 can be configured to drive a
bi-amplified system by itself.
Bi-Amplified System with one XD700/5
In this configuration, the Subwoofer Channel
of the XD700/5 will drive a subwoofer system
with low-pass filtering. The Main Channels (1&2,
3&4) will drive component speakers in stereo
with high-pass filtering.
Crossover Setup for Bi-Amplified System
with one XD700/5:
Once the input sections have been configured
appropriately (see page 6), go to the “SUB CH.”
control section and select “12dB” or “24dB”
(low-pass) on the “LP Filter Mode” switch and
an appropriate “Filter Freq.” (80 Hz is a good
starting point). The “12dB” setting engages a
shallow filter slope that gradually attenuates
frequencies above the selected “Filter Freq.”
setting. The “24dB” setting engages a sharper
filter slope that more aggressively attenuates
frequencies above the selected “Filter Freq.”
setting. Neither setting is “better”, but in general,
the shallower “12dB” setting is more desirable for
a subwoofer having to fire from a trunk into the
cabin of a sedan or coupe. The sharper “24dB”
setting is typically better in a hatchback, SUV or
wagon application. Experiment to find the slope
setting that results in the smoothest subwoofer to
midbass transition.
Next, turn your attention to the “CH 1 & 2”
Controls and select “x1” (high-pass) on the “HP
Filter Mode” switch and select an appropriate
“Filter Freq.” (again, 80 Hz is a good starting
point). The “x1” setting means that the Filter
Freq. indicated on the dial is exactly what you are
selecting. (In the “x10” mode, the actual Filter
Frequency is ten times higher than the indicated
value. This setting is generally not used in
bi-amplified systems.)
Finally, turn your attention to the “CH 3 & 4”
Controls and select “HP” (high-pass) on the “Filter
Mode” switch and select an appropriate “Filter
Freq.” (again, 80 Hz is a good starting point).
Tri-Amplified Systems with one XD700/5
The XD700/5’s 3-way crossover capability
allows you to create true, tri-amplified systems by
selecting the appropriate settings described below.
In a tri-amplified configuration, the
Subwoofer Channel of the XD700/5 will drive
a subwoofer system, in mono, with low-pass
filtering. Channels 3 & 4 will drive component
woofers (or mid-range speakers) in stereo
with bandpass filtering (both a high-pass
and a low-pass filter applied). Channels 1 & 2
will drive high-frequency speakers (tweeters,
typically), in stereo, with high-pass filtering.
To operate a single XD700/5 in Tri-Amplified
mode, set the “Input Mode” switch in “2 Ch.”
mode, and apply a single set of stereo inputs to the
Ch. 1 & 2 Inputs only!
Crossover Setup for Tri-Amplified System
with one XD700/5:
First go to the “SUB CH.” control section
and select “12dB” or “24dB” (low-pass) on the
“LP Filter Mode” switch and an appropriate
“Filter Freq.” (80 Hz is a good starting point). The
“12dB” setting engages a shallow filter slope that
gradually attenuates frequencies above the selected
“Filter Freq.” setting. The “24dB” setting engages