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Figure 7. MA6002 used in 2-channel (stereo) 
operation to drive a set of full-range speakers.

Figure 8. MA6002 used in bridge mode to drive a
subwoofer.

8

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.

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

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

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