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Amplifier Inputs
4 Stereo Outputs (non-fading)
Channel Mode: 2CH
Inputs: Use Front Inputs Only
RMS Power: 50W x 4 @ 4 Ω (70W x 4 @ 2 Ω)
Front
Source
Rear
Amplifier Inputs
4 Stereo Outputs (fading)
Channel Mode: 4CH
Inputs: Use Front and Rear Inputs
RMS Power: 50W x 4 @ 4 Ω (70W x 4 @ 2 Ω)
Front
Source
Rear
Amplifier Inputs
2 Bridged Mono Outputs
Channel Mode: 2CH
Inputs: Use Front Inputs Only
RMS Power: 140W x 2 @ 4 Ω
Front
Source
Rear
Amplifier Inputs
2 Bridged Stereo Outputs
Channel Mode: 4CH
Inputs: Left Signal to Both Front Inputs / Right
Signal to Both Rear Inputs
RMS Power: 140W x 2 @ 4 Ω
Y-Adaptor
Front
Source
Y-Adaptor
Amplifier Inputs
2 Stereo Front + 2 Mono Rear Outputs
Channel Mode: 3CH
Inputs: Use Front Inputs Only
RMS Power: 50W x 4 @ 4 Ω (70W x 4 @ 2 Ω)
Front
Source
Rear
Amplifier Inputs
2 Stereo Front + 1 Bridged Mono Rear
Output
Channel Mode: 3CH
Inputs: Use Front Inputs Only
RMS Power: 50W x 2 @ 4 Ω (70W x 2 @ 2 Ω) + 140W
x 1 @ 4 Ω
Front
Source
Rear
Speaker Outputs
[FL+]
White
White
[FL–]
White/Black
White/Black
[FRONT IN]
[FR+]
Gray
Gray
[FR–]
Gray/Black
Gray/Black
[RL+]
Green
Green
Green/Black
Green/Black
[RL–]
(Not Used)
[REAR IN]
[RR+]
Purple
Purple
[RR–]
Purple/Black
Purple/Black
Speaker Outputs
[FL+]
White
White
[FL–]
White/Black
White/Black
[FRONT IN]
[FR+]
Gray
Gray
[FR–]
Gray/Black
Gray/Black
Green
Green
[RL+]
[RL–]
Green/Black
Green/Black
[REAR IN]
[RR+]
Purple
Purple
[RR–]
Purple/Black
Purple/Black
Speaker Outputs
[FL+]
White
White
[FL–]
White/Black
White/Black
[FRONT IN]
[FR+]
Gray
Gray
[FR–]
Gray/Black
Gray/Black
[RL+]
Green
Green
Green/Black
Green/Black
[RL–]
(Not Used)
[REAR IN]
[RR+]
Purple
Purple
[RR–]
Purple/Black
Purple/Black
Speaker Outputs
[FL+]
White
White
[FL–]
White/Black
White/Black
[FRONT IN]
[FR+]
Gray
Gray
[FR–]
Gray/Black
Gray/Black
Green
Green
[RL+]
[RL–]
Green/Black
Green/Black
[REAR IN]
Purple
Purple
[RR+]
[RR–]
Purple/Black
Purple/Black
Speaker Outputs
[FL+]
White
White
[FL–]
White/Black
White/Black
[FRONT IN]
Gray
Gray
[FR+]
[FR–]
Gray/Black
Gray/Black
Green
Green
[RL+]
[RL–]
Green/Black
Green/Black
(Not Used)
[REAR IN]
[RR+]
Purple
Purple
[RR–]
Purple/Black
Purple/Black
Speaker Outputs
[FL+]
White
White
[FL–]
White/Black
White/Black
[FRONT IN]
[FR+]
Gray
Gray
[FR–]
Gray/Black
Gray/Black
Green
Green
[RL+]
Green/Black
Green/Black
[RL–]
(Not Used)
[REAR IN]
[RR+]
Purple
Purple
[RR–]
Purple/Black
Purple/Black
ENGLISH
ESPAÑOL
FRANCAIS
DEUTSCH
FL+
White
Blanco
Blanc
Weiß
FL–
White/Black
Blanco/Negro
Blanc/Noir
Weiß/Schwarz
FR+
Gray
Gris
Gris
Grau
FR–
Gray/Black
Gris/Negro
Gris/Noir
Grau/Schwarz
RL+
Green
Verde
Vert
Grün
RL–
Green/Black
Verde/Negro
Vert/Noir
Grün/Schwarz
RR+
Purple
Púrpura
Violet
Lila
RR–
Purple/Black
Púrpura/Negro
Violet/Noir
Lila/Schwarz
Appendix A:
Input Sensitivity Level Setting
Following the directions below will allow the installer to adjust the input
sensitivity of each amplifier channel pair in just a few minutes using equipment
commonly available in installation bays.
Necessary Equipment
• Digital AC Voltmeter
• CD or file 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.).
1)
The Nine-Step Procedure
Disconnect the speakers from the amplifier's speaker output connec-
2)
tors (you need only disconnect one wire on each output).
Turn off all processing (bass/treble, loudness, EQ, etc.) on the source
unit, processors (if used) and amplifier. Set the source unit's fader con-
trol to center position and its subwoofer level control to 3/4 of maxi-
3)
mum.
4)
Turn the "Input Sens." control all the way down.
Set the source unit volume to 3/4 of full volume. This will allow for rea-
5)
sonable gain overlap with moderate clipping at full volume.
Using the chart on this page, determine the target voltage for input
sensitivity adjustment according to the nominal impedance of the
6)
speaker system connected to the amplifier outputs.
Verify that you have disconnected the speakers before proceeding. Play
a track with an appropriate sine wave (within the frequency range to
7)
be amplified) at 3/4 source unit volume.
Connect the AC voltmeter to the speaker output connectors of the
amplifier. Make sure you test the voltage at the correct connectors
8)
(+ and –).
Increase the "Input Sens." control until the target voltage is observed
9)
with the voltmeter.
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.
MX280/4
Nom. Impedance
Target AC Voltage
4Ω
14.1 V
2Ω
11.8 V
Bridged to 4Ω
23.7 V
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.
Troubleshooting
Problem
Possible Cause
Solution
Please refer to Appendix A to set the
How to properly set
input sensitivity for maximum, low-
input sensitivity
distortion output.
Remove fuse and check with continuity
Faulty fuse
meter. Replace if necessary.
Check "+12V", "Ground", and "Remote"
Poor connection
Amplifier doesn't
leads for pinched wires; ensure tight
integrity
turn on
connections.
Make sure there is a sufficient +12V
Insufficient "Remote"
supply at the "Remote" connection; if
input
not a relay may be required.
Make sure insulation has been properly
stripped back at connection points for
Intermittent output,
good contact area.
Poor connection
fluctuates when I tap
integrity
Make sure input connectors are making
on it or hit a bump
good contact with input jacks of the
amplifier.
Inspect speaker wires for possible
short-circuit, either together or shorted
Faulty speaker
to the vehicle's chassis ground.
Distorted, attenuated,
connection (Short
or popping sound
Circuit / Over Current
Check the nominal load impedance at
Protection)
the amplifier is equal to or greater than
2 ohms stereo (4 ohms bridged).
Overheating
Make sure amplifier mounting area has
Output shuts off after
condition (Thermal
adequate space for ventilation and heat
a while
Protection)
dissipation.
Limited Warranty – Amplifiers (USA)
JL Audio warrants this product to be free of defects in materials and
workmanship for a period of two (2) years from the original date of purchase.
This warranty is not transferrable and applies only to the original purchaser
from an authorized JL Audio dealer. Should service be necessary under this
warranty for any reason due to manufacturing defect or malfunction, JL
Audio will (at its discretion), repair or replace the defective product with new
or remanufactured product at no charge. Damage caused by the following is
not covered under warranty: accident, misuse, abuse, product modification or
neglect, failure to follow installation instructions, unauthorized repair attempts,
misrepresentations by the seller. This warranty does not cover incidental or
consequential damages and does not cover the cost of removing or reinstalling
the unit(s). Cosmetic damage due to accident or normal wear and tear is not
covered under warranty.
Warranty is void if the product's serial number has been removed or defaced.
Any applicable implied warranties are limited in duration to the period of the
express warranty as provided herein beginning with the date of the original
purchase at retail, and no warranties, whether express or implied, shall apply
to this product thereafter. Some states do not allow limitations on implied
warranties, therefore these exclusions may not apply to you. This warranty gives
you specific legal rights, and you may also have other rights, which vary from
state to state.
If you need service on your JL AUDIO product:
All warranty returns should be sent to JL Audio 's Amplifier Service Facility
freight-prepaid through an authorized JL Audio dealer and must be
accompanied by proof of purchase (a copy of the original sales receipt). Direct
returns from consumers or non-authorized dealers will be refused unless
specifically authorized by JL Audio with a valid return authorization number.
Warranty expiration on products returned without proof of purchase will be
determined from the manufacturing date code. Coverage may be invalidated
as this date is previous to purchase date. Non-defective items received will
be returned freight-collect. Customer is responsible for shipping charges and
insurance in sending the product to JL Audio. Freight damage on returns is not
covered under warranty.
For Service Information in the U.S.A. please call
JL Audio Customer Service:
(954) 443-1100
9:00 AM – 5:30 PM (Eastern Time Zone)
JL Audio, Inc.
10369 North Commerce Pkwy.
Miramar, FL 33025
(Do not send product for repair to this address)
International Warranties:
Products purchased outside the United States of America are covered only
by that country's distributor and not by JL Audio, Inc.
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