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CHAPTER 3: OPERATIONS
Setting the input levels:

To match your amplifier’s input sensitivity (gain) to your source unit’s output

level, we recommend the following procedure:

Turn both input level controls counterclockwise to MIN (minimum).

Play a dynamic music track through your source unit. Turn the source unit’s

volume control to the 3/4 position.

. Turn the front input level control dial clockwise towards MAX until you hear

distortion in the music (it’s no longer clear).

Slowly turn the front level input control dial counterclockwise until the music

sounds clear again.

Your front input level is now correctly set. Repeat this process with the rear

channels.

Setting the crossover

Properly setting crossover filter selectors optimizes frequency distribution for

efficient speaker operation and best sound.

Step 1:

Use the slider controls to select low-pass (LPF), FULL, or high-pass

(HPF).
• LPF: Low pass. Choose this setting if you are connecting a subwoofer(s) or

want to provide a low-pass filter for separate mid-bass speakers.

•

FULL: Full range. Choose this setting if you are connecting full-range

speakers and are not using a subwoofer in your system.

• HPF: High pass. Choose this setting to prevent low bass from reaching

midrange or full-range speakers when you are using a subwoofer in your

system.

Step 2:

Use crossover-filter frequency controls to adjust crossover point

settings for coaxial speakers and subwoofers to suit listener preference. Turn

the dials to the left to lower the crossover point and to the right to raise the

crossover point. Exact crossover settings for coaxial speakers and subwoofers

finally depend on your listening preferences. NOTE: crossover point does not

apply in FULL mode.

The Stage 3001A also lets you choose the center

frequency of the bass boost – the frequency that

receives the most boost effect. Turn the FREQ dial to

the right to adjust the center frequency. The frequency

you choose depends on your listening preferences.

CHAPTER 4: TROUBLESHOOTING
PROBLEM:

No audio and POWER INDICATOR is off.

CAUSE and SOLUTION: No voltage at BATT+ and/or REM terminals, or

bad or no ground connection. Check voltages at amplifier terminals with

VOM.

PROBLEM:

No audio and PROTECT INDICATOR flashes every 4

seconds.

CAUSE and SOLUTION: DC voltage on amplifier output. Amplifier may

need service; see enclosed warranty card for service information.

PROBLEM:

No audio and PROTECT INDICATOR is on.

CAUSE and SOLUTION: Amplifier is overheated. Make sure amplifier

cooling is not blocked at mounting location. Verify that speaker-system

impedance is within specified limits. Or, there may be voltage greater than

16V (or less than 8.5V) on BATT+ connection. Check vehicle charging

system.

PROBLEM:

No audio and PROTECT and POWER INDICATORS flash.

CAUSE and SOLUTION: Voltage less than 9V on BATT+ connection.

Check vehicle charging system.

PROBLEM:

Distorted audio.

CAUSE and SOLUTION: Gain is not set properly. Check INPUT LEVEL

setting. Check speaker wires for shorts or grounds. Amplifier or source

unit may be defective.

PROBLEM:

Distorted audio and PROTECT INDICATOR flashes.

CAUSE and SOLUTION: Short circuit in speaker or wire. Remove speaker

leads one at a time to locate shorted speaker or wire, and repair.

PROBLEM:

Music lacks dynamics or "punch."

CAUSE and SOLUTION: Speakers are not connected properly. Check

speaker connections for proper polarity.

PROBLEM:

Amplifier fuse keeps blowing.

CAUSE and PROBLEM: The wiring is connected incorrectly or there is a

short circuit. Review installation precautions and procedures in manual.

Check wiring connections.

PROBLEM:

Engine noise—whining or clicking—in system when the

engine is on.

CAUSE and PROBLEM: Amplifier is picking up alternator noise. Turn

down gain. Move audio cables away from power wires. Install an

alternator noise filter on power line between battery and alternator. Check

ground connections on the amplifier since a loose or improper ground is

one of the main causes for extraneous noise in your audio system.

Selecting the subwoofer phase

With the Stage A3001, you can choose a subwoofer

phase output of 0° or 180°. To check your sub's

phase, play music with lots of bass and listen as

another person slowly turns the dial back and forth

between 0 and 180 degrees. The correct setting is the

one that gives you more bass. If you don't detect any

real difference, leave the dial in the 0 setting.

© 2018 HARMAN International Industries, Incorporated. All rights reserved.
JBL is a trademark of HARMAN International Industries, Incorporated, registered in the
United States and/or other countries. Features, specifications and appearance are subject
to change without notice.

HARMAN International
Industries, Incorporated
8500 Balboa Boulevard,
Northridge, CA 91329 USA
www.jbl.com

CHAPTER 5: SPECIFICATIONS

Model

Stage A6002

60W

90W

N/A

0.2V

>75dB

<1%

20A

2 x 15A