Controls and Setup Troubleshooting, Setting Crossovers

CONTROLS AND SETUP

TROUBLESHOOTING

SETTING THE

CROSSOVER(S)

Determine your system plans and set the crossover mode switch accordingly. If your system design does not include a subwoofer with the MA6004, set the crossover mode to FLAT; if you are using speakers that are 5 inches in diameter or larger, skip to “Setting Input Sensitivity.”

Initially set the crossover frequency control midway. While listening to music, adjust the crossover for the least perceived distortion from the speakers, allowing them to reproduce as much bass as possible.

For systems using a separate subwoofer, set the crossover mode to HP (high pass) for your full-range speakers. Adjust the crossover frequency to limit bass and provide increased system volume with less distortion.

For subwoofers, choose the highest frequency that removes vocal information from the sound of the subwoofer.

If using the MA6004 or MA6002 to drive a subwoofer(s), set the crossover mode to LP (low pass).

SETTING INPUT

SENSITIVITY

1.Initially turn the INPUT LEVEL control(s) to minimum (counter clockwise).

2.Reconnect the (–) negative lead to the boat’s battery. Apply power to the audio system and play a dynamic music track.

3.On the source unit, increase the volume control to 3/4 volume. Slowly increase the INPUT LEVEL control(s) toward “three o’clock” until you hear slight distortion in the music. Then reduce the INPUT LEVEL slightly until distortion is no longer heard.

NOTE: After the source unit is on, blue LEDs (on the top panel) will light, indicating the amplifier is on. If not, check the wiring, especially the remote connection from the source unit. Also refer to the “Troubleshooting” guide.

SYMPTOM	LIKELY CAUSE	SOLUTION
No audio	No voltage at BATT+	Check voltages at
(POWER LEDs	or REM terminals,	amplifier terminals
are off)	or bad or no ground	with VOM
	connection
No audio	Amplifier is	Make sure amplifier
(POWER	overheated	cooling is not blocked
LEDs are on)		at mounting location;
		verify speaker-system
		impedance is within
		specified limits
	Voltage more than 16V	Check boat’s battery
	or less than 8.5V on	charging system
	BATT+ connection
No audio	Voltage less than 9V on	Check boat’s
(POWER	BATT+ connection	charging system
LEDs flash)	DC voltage on	Amplifier may need
	DC voltage on	Amplifier may need
	amplifier output	service; see enclosed
		warranty card for
		service information
Distorted audio	Input sensitivity is	Check INPUT
	not set properly, or	LEVEL setting; or
	amplifier or source	check speaker wires
	unit is defective	for shorts or grounds
Distorted audio	Short circuit in	Remove speaker leads
and POWER	speaker or wire	one at a time to locate
LEDs flash		shorted speaker or
		wire, then repair
Music lacks	Speakers are not	Check speaker
“punch”	connected properly	connections for
		proper polarity

MA6004, MA6002 specifications

The JBL MA6002 and MA6004 are powerful multi-channel amplifiers engineered for optimal performance in 12V audio systems, making them popular choices among car audio enthusiasts. These amplifiers combine advanced technologies with robust construction, delivering a remarkable audio experience tailored for in-vehicle environments.

One of the standout features of the JBL MA6002 and MA6004 is their high power output. The MA6002 is a two-channel amplifier that typically delivers 60 watts per channel at 4 ohms, while the MA6004, a four-channel amplifier, can deliver 50 watts per channel at 4 ohms. This impressive output capability ensures that users can enjoy rich, dynamic sound quality at high volumes without distortion.

The MA6002 and MA6004 amplifiers incorporate advanced protection circuitry, which safeguards against overheating, short circuits, and other potential issues. This not only enhances the longevity of the amplifiers but also ensures reliable performance during extended use. Their compact design facilitates seamless installation in a variety of vehicle models, making them suitable for diverse setups.

Both amplifiers utilize high-quality components, including MOSFET power supply and output devices, which contribute to their efficient energy conversion. The use of these components ensures that the amplifiers operate cooler and more effectively, providing better sound quality while consuming less power.

The MA6002 and MA6004 are equipped with comprehensive controls for fine-tuning audio output. Users can adjust gain levels, crossover settings, and bass boost to achieve desired sound characteristics. The built-in low-pass and high-pass filters allow for better integration with subwoofers and other speakers, resulting in a well-rounded audio experience.

Another key characteristic of these JBL amplifiers is their ability to deliver clear sound reproduction at any frequency. Whether it’s deep bass or crisp highs, the MA6002 and MA6004 ensure that every aspect of the audio signal is captured and amplified accurately.

In summary, the JBL MA6002 and MA6004 amplifiers are sophisticated audio components that provide excellent power output, advanced protection features, and customizable controls. Their capacity to deliver rich sound in a compact design makes them a favorite for car audio systems, appealing to both casual listeners and serious audiophiles alike. With these amplifiers, JBL continues to reinforce its reputation as a leader in the audio industry, combining cutting-edge technology with user-centric design.