Manual JL Audio MX280 (page 2 of 2) (English)

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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

Problem Possible Cause Solution

How to properly set

input sensitivity



Please refer to Appendix A to set the

input sensitivity for maximum, low-

distortion output.

Amplifier doesn’t

turn on

Faulty fuse

Remove fuse and check with continuity

meter. Replace if necessary.

Poor connection

integrity

Check “+12V”, “Ground”, and “Remote”

leads for pinched wires; ensure tight

connections.

Insufficient “Remote”

input

Make sure there is a sufficient +12V

supply at the “Remote” connection; if

not a relay may be required.

Intermittent output,

fluctuates when I tap

on it or hit a bump

Poor connection

integrity

Make sure insulation has been properly

stripped back at connection points for

good contact area.

Make sure input connectors are making

good contact with input jacks of the

amplifier.

Distorted, attenuated,

or popping sound

Faulty speaker

connection (Short

Circuit / Over Current

Protection)

Inspect speaker wires for possible

short-circuit, either together or shorted

to the vehicle’s chassis ground.

Check the nominal load impedance at

the amplifier is equal to or greater than

2 ohms stereo (4 ohms bridged).

Output shuts off after

a while

Overheating

condition (Thermal

Protection)

Make sure amplifier mounting area has

adequate space for ventilation and heat

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:

(95 4) 4 43-110 0

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.

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.

MX280/4

Nom. Impedance Target AC Voltage

4Ω 14.1 V

2Ω 11.8 V

Bridged to 4Ω 23.7 V

Rear

[REAR IN]

[FRONT IN]

White

White/Black

Gray

Gray/Black

Green

Green/Black

Purple

Purple/Black

Source

(Not Used)

[FR–]

[FR+]

[RL–]

[RL+]

[RR–]

[RR+]

[FL–]

[FL+]

White

White/Black

Gray

Gray/Black

Green

Green/Black

Purple

Purple/Black

Front

Amplifier Inputs Speaker Outputs

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)

Rear

[REAR IN]

[FRONT IN]

White

White/Black

Gray

Gray/Black

Green

Green/Black

Purple

Purple/Black

Source

[FR–]

[FR+]

[RL–]

[RL+]

[RR–]

[RR+]

[FL–]

[FL+]

White

White/Black

Gray

Gray/Black

Green

Green/Black

Purple

Purple/Black

Front

Amplifier Inputs Speaker Outputs

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)

Rear

[REAR IN]

[FRONT IN]

White

White/Black

Gray

Gray/Black

Green

Green/Black

Purple

Purple/Black

Source

(Not Used)

[FR–]

[FR+]

[RL–]

[RL+]

[RR–]

[RR+]

[FL–]

[FL+]

White

White/Black

Gray

Gray/Black

Green

Green/Black

Purple

Purple/Black

Front

Amplifier Inputs Speaker Outputs

2 Bridged Mono Outputs

Channel Mode: 2CH

Inputs: Use Front Inputs Only

RMS Power: 140W x 2 @ 4 Ω

[REAR IN]

[FRONT IN]

Source

Front

White

White/Black

Gray

Gray/Black

Green

Green/Black

Purple

Purple/Black

[FR–]

[FR+]

[RL–]

[RL+]

[RR–]

[RR+]

[FL–]

[FL+]

White

Y-Adaptor

White/Black

Gray

Gray/Black

Green

Green/Black

Purple

Purple/Black

Amplifier Inputs Speaker Outputs

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

Rear

[REAR IN]

[FRONT IN]

Source

(Not Used)

Front

White

White/Black

Gray

Gray/Black

[FR–]

[FR+]

[FL–]

[FL+]

White

White/Black

Gray

Gray/Black

Green

Green/Black

Purple

Purple/Black

[RL–]

[RL+]

[RR–]

[RR+]

Green

Green/Black

Purple

Purple/Black

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

Amplifier Inputs Speaker Outputs

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)

Rear

[REAR IN]

[FRONT IN]

Source

(Not Used)

Front

White

White/Black

Gray

Gray/Black

Green

Green/Black

Purple

Purple/Black

White

White/Black

Gray

Gray/Black

Green

Green/Black

Purple

Purple/Black

[FR–]

[FR+]

[FL–]

[FL+]

[RL–]

[RL+]

[RR–]

[RR+]

Troubleshooting

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.).

The Nine-Step Procedure

1) Disconnect the speakers from the amplifier’s speaker output connec-

tors (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 con-

trol to center position and its subwoofer level control to 3/4 of maxi-

mum.

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 rea-

sonable 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 –).

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.

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JL Audio MX280 Manual

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