JL Audio JX 360/4 Manual De Instrucciones página 7

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 speakers from the
amplifier's speaker output connectors (you need
only disconnect one wire on each output).
2) Turn off all processing (bass/treble, loudness,
EQ, etc.) on the source unit, processors (if used)
and amplifier. Set the source unit's fader control
to center position and its subwoofer level control
to 3/4 of maximum.
3) Turn the "Input Sens." control 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) 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 –).
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8) Increase the "Input Sens." control until the
target voltage is observed with the voltmeter.
9) Once you have adjusted the amplifier to
its maximum low-distortion output level,
reconnect the speaker(s) and listen to the
system. The "Input Sens." controls can
now be adjusted downward if the amplifier
requires attenuation to achieve the desired
system balance.
!
I m p o r ta n t !
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 re-adjust 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. target ac voltage
Impedance
stereo bridged
8Ω
16.7 V 26.8 V
6Ω 16.7 V 26.8 V
4Ω
16.7 V 26.8 V
3Ω
15.5 V not recommended
2Ω
13.4 V not recommended
JL Audio JX360/4
appendIx b:
Jx360/4 specifications
amplifier section:
Amplifier Topology: Class A/B
Power Supply: Unregulated PWM switching type
Frequency Response: 20 Hz - 20 kHz +0/-1 dB
Signal to Noise Ratio:
>100 dBA referred to highest rated power per ch.,
>80 dBA referred to 1W (20 Hz - 20 kHz Bandwidth)
Damping Factor: >60 @ 4 ohms per ch.
THD + Noise @ Rated Power: 1 %
rated continuous (rms) power @ 14.4v:
Stereo, all channels driven:
70W RMS x 4 @ 4 ohms
90W RMS x 4 @ 2 ohms
Bridged, all channels driven:
180W RMS x 2 @ 4 ohms
rated continuous (rms) power @ 12.5v:
Stereo, all channels driven:
55W RMS x 4 @ 4 ohms
80W RMS x 4 @ 2 ohms
Bridged, all channels driven:
160W RMS x 2 @ 4 ohms
signal processing:
Filter Type (for each channel pair): 12dB/octave High-
Pass or Low-Pass with continuously variable cutoff
frequency selection from 50 - 200 Hz. Defeatable.
Preamp Output: 2-Channel, unbuffered pass-through
with RCA-type jacks, summed from both input pairs.
Input sections:
No. of Inputs:
Two Stereo Pairs with 2/4 Ch. Input Mode Switch
Low-Level Inputs: Single-ended with RCA jack inputs
Low-Level Input Range: 200mV - 4V RMS
High-Level Inputs: Single-ended with molded connector
High-Level Input Range: 2V - 10V RMS
power connections:
Recommended Fuse Value (Type): 50A (MAXI or AGU)
Minimum Copper Power/Ground Wire Gauge: 4 AWG
dimensions (lxwxH):
15.40" x 7.68" x 2.15" (391 mm x 195 mm x 55 mm)
net weight:
8.75 lbs. (3.97 kg)
Due to ongoing product development, all specifications are subject to
change without notice.
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