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14 | JL Audio - XD500/3v2 Owners Manual
APPENDIX A:
Input Sensitivity Level Setting
Following the directions below will allow the
installer to adjust the input sensitivity of each
amplifier channel pair simply and easily in just a
few minutes using equipment which is commonly
available in installation bays.
Necessary Equipment
• Digital AC Voltmeter
CD with a sine-wave test tone recorded at
0 dB reference level in the frequency range
to be amplified for that set of channels
(50 Hz for subwoofer channels, 1 kHz for a
midrange application). Do not use attenuated
test tones (-10 dB, -20 dB, etc.).
The Nine-Step Procedure
1) Disconnect the speaker(s) from the
amplifier’s speaker output connectors.
2) Turn off all processing (bass/treble, loudness,
EQ, etc.) on the source unit, processors (if
used) and amplifier. Set the fader control to
center position and the subwoofer level control
to 3/4 of maximum (if used to feed
the XD500/3v2).
3) Switch the “Input Voltage switch to Low
and turn all three “Input Sens. controls all
the way down.
4) Set the source unit volume to 3/4 of full
volume. This will allow for reasonable gain
overlap with moderate clipping at full volume.
5) Using the chart on this page, determine
the target voltage for input sensitivity
adjustment according to the nominal
impedance of the speaker system
connected to the amplifier outputs.
6) Verify that you have disconnected the speakers
before proceeding. Play a track with an
appropriate sine wave (within the frequency
range to be amplified by the XD500/3v2) at 3/4
source unit volume.
7) Connect the AC voltmeter to the speaker
output connectors of the amplifier. Make sure
you test the voltage at the correct connectors
(+ and –).
8) Increase the “Input Sens.” control until the
target voltage is observed with the voltmeter.
9) Once you have adjusted each channel
section on the XD500/3v2 to its maximum
low-distortion output level, reconnect the
speaker(s). The “Input Sens.” controls can
now be adjusted downward if the amplifier
requires attenuation to achieve the desired
system balance.
Do not increase any “Input Sens.” setting for
any amplifier channel or channel pair in the
system beyond the maximum level established
during this procedure. Doing so will result in
audible distortion and possible speaker damage.
It will be necessary to readjust the
“Input Sens. for the affected channels if any
equalizer boost is activated after setting the
“Input Sens. with this procedure. This applies
to any EQ boost circuit, including source unit
tone controls or EQ circuits. EQ cuts will not
require re-adjustment.
Nom.
Impedance
Target AC Voltage
CH 1 & 2
(Stereo)
CH 1 & 2
(Bridged)
Subwoofer CH
8
17.3 V 34.6 V 26.8 V
4
17.3 V 28.2 V 26.8 V
3
16.2 V not recommended 26.8 V
2
14.1 V not recommended 24.5 V
14


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