Input Sensitivity Controls; Filter Controls - JL Audio XD 800/8v2 Owner's Manual

inPut sensitiVitY Controls

The controls labeled "Input Sens." located in
each channel section can be used to match the
source unit's output voltage to the input stage of
each pair of amplifier channels for maximum
clean output. Rotating the control clockwise will
result in higher sensitivity (louder for a given
input voltage). Rotating the control counter-
clockwise will result in lower sensitivity (quieter
for a given input voltage.)
H. 1 & 2 CH. 3 & 4 CH. 5 & 6
Input Input
Sens. Sens.
Filter Mode Filter Mode Filter Mode
O | HP | LP O | HP | LP O | HP | LP
Filter Freq. (Hz) Filter Freq. (Hz)
CH. 1 CH. 2 CH. 3 CH. 4
(L) (R) (L) (R)
To properly set the amplifier for maximum
clean output, please refer to Appendix A (page
14) in this manual. After using this procedure,
you can then adjust any or all "Input Sens."
levels downward if this is required to achieve the
desired system balance.
Do not increase any "Input Sens." setting for
any channel(s) of any amplifier in the system
Remote
Turn-On
Level
Mode
beyond the maximum level established during
Mode
Rem. | O set | Signal
the procedure outlined in Appendix A (page 14).
Input Voltage
Doing so will result in audible distortion and
possible speaker damage.
Low | High 2 Ch. | 4 Ch. | 8 Ch.
MODES:
put 1 feeds CH. 1, CH. 3, CH. 5 & CH. 7
put 2 feeds CH. 2, CH. 4, CH. 6 & CH. 8
CH. 1 CH. 3 CH. 5 CH. 7 (L)
put 1 feeds CH. 1 & CH. 3
put 2 feeds CH. 2 & CH. 4
put 5 feeds CH. 5 & CH. 7
put 6 feeds CH. 6 & CH. 8
(R)
CH. 2 CH. 4 CH. 6 CH. 8
ch input feeds its
rresponding output channel
8 | JL Audio - XD800/8v2 Owner's Manual

Filter Controls

Most speakers are not designed to reproduce
the full range of frequencies audible by the human
ear. For this reason, most speaker systems are
comprised of multiple speakers, each dedicated
to reproducing a specific frequency range. Filters
are used to select which frequency range is sent
to each section of a speaker system. The division
of frequency ranges to different speakers can be
done with passive filters (coils and/or capacitors
between the amplifier outputs and the speakers),
which are acceptable and commonly used
for filtering between mid-range speakers and
CH. 7 & 8
Input Input
Sens. Sens.
tweeters. Filtering between subwoofer systems
and satellite speaker systems is best done with
Filter Mode
active filters, which cut off frequency content at
the input to the amplifier. Active filters are more
O | HP | LP
stable than passive filters and do not introduce
Filter Freq. (Hz) Filter Freq. (Hz)
extraneous resistance, which can degrade
subwoofer performance.
The active filter built into each channel section
of the XD800/8v2 can be used to eliminate
CH. 5 CH. 6 CH. 7 CH. 8
(L) (R) (L) (R)
potentially harmful and/or undesired frequencies
from making their way through the amplifier
sections to the speaker(s). This serves to improve
tonal balance and to avoid distortion and possible
speaker failure. Correct use of these filters can
substantially increase the longevity and fidelity of
your audio system.
CH. 1 & 2 CH. 3 & 4
Input Input
Sens. Sens.
All | 5- 8 | 7&8
Input Mode Filter Mode Filter Mode
O | HP | LP O | HP | LP
Filter Freq. (Hz) Filter Freq. (Hz)
CH. 1 CH. 2 CH. 3
(L) (R) (L)
1) "Filter Mode" Control: The XD800/8v2
employs a 12dB per octave filter for each
pair of channels. Each of these filters can be
configured independently into one of two filter
types or defeated completely by way of the
three-position "Filter Mode" switches:
"Off": Defeats the filter completely, allowing
the full range of frequencies present at the inputs
to feed the amplifier. This is useful for systems
utilizing outboard active crossovers or requiring
full-range reproduction from one or more of the
XD800/8v2's channel pairs.
"LP" (Low-Pass): Configures the filter to
attenuate frequencies above the selected filter
frequency at a rate of 12 dB per octave. This is
useful for connection of subwoofer(s) to one
+12 VDC Ground
or more of the XD800/8v2's channel pairs in a
bi-amplified system.
"HP" (High-Pass): Configures the filter to
attenuate frequencies below the selected filter
frequency at a rate of 12 dB per octave. This is
useful for connection of component speakers to
one or more of the XD800/8v2's channel pairs in
a bi-amplified system.
2) "Filter Freq. (Hz)" The filter frequency
markings surrounding this rotary control
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 XD800/8v2
to drive a subwoofer system ("LP" mode), a
component satellite speaker system ("HP" mode)
or both, 80 Hz is a good baseline "Filter Freq.
(Hz)" setting. After properly adjusting the "Input
CH. 5 & 6 CH. 7 & 8
Input Input
Sens.", as outlined in Appendix A (page 14), you
Sens. Sens.
can fine tune the "Filter Freq. (Hz)" control to
Filter Mode Filter Mode
achieve the desired system frequency response.
O | HP | LP O | HP | LP
Filter Freq. (Hz) Filter Freq. (Hz)
8 Channel Amplifier
CH. 4 CH. 5 CH. 6 CH. 7 CH. 8
(R) (L) (R) (L) (R)
+12 VDC Ground
remote leVel Control (oPtional)
(L)
(R)
Remote
CH. 1&2 CH. 3&4
INPUT SECTION
With the addition of the optional Remote
Level Control (HD-RLC), you can control the
volume of two, four or all eight channels of the
XD800/8v2 from the front of the vehicle. This
feature can be used for subwoofer level control,
rear channel level control, zone control, or even
as a master volume control for the system.
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,
non-duplex 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.
Turn-On
INPUT MODES:
2 Ch. Input 1 feeds CH. 1, CH. 3, CH. 5 & CH. 7 "Remote Level Mode" Switch: This switch
Input 2 feeds CH. 2, CH. 4, CH. 6 & CH. 8
CH. 1 CH. 3
4 Ch. Input 1 feeds CH. 1 & CH. 3
allows you to assign the operation of the
Input 2 feeds CH. 2 & CH. 4
Input 5 feeds CH. 5 & CH. 7
HD-RLC to one, two or all four pairs of channels.
Input 6 feeds CH. 6 & CH. 8
CH. 2 CH. 4
8 Ch. Each input feeds its
In the "All" position, the HD-RLC knob will
corresponding output channel
Remote
affect all four channel pairs equally.
In the "5-8" (middle) position, only the level
of channels 5, 6, 7 and 8 will be affected by the
HD-RLC knob (channels 1, 2, 3 and 4 will not).
In the "7 & 8" position, only the level of
channels 7 and 8 will be affected by the HD-RLC
knob (channels 1 through 6 will not).
Remote
Level
Control
CH. 1 CH. 2
(L) (R)
CH. 5&6 CH. 7&8
Bridged
Remote
CH. 1 & 2
Level Input
Mode
Mode
Sens.
Rem. | O set | Signal All | 5 - 8 | 7&8
Input Voltage Input Mode Filter Mode
Low | High 2 Ch. | 4 Ch. | 8 Ch. O | HP | LP
Filter Freq. (Hz)
(L)
CH. 5 CH. 7
CH. 6 CH. 8 (R)
CH. 1 CH. 2
(L) (R)
9
CH
(
CH. 3 &
Fil
O