KMA KMA150.2 - User Manual

Questions and Answers

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Jacob SmithJul 29, 2025
What to do if red LED is on but there is no output from my KMA KMA150.2 Amplifier?
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  Monique NavarroJul 29, 2025
  If the red LED is illuminated, but there's no output, several issues could be the cause. First, the amplifier might be overheating; use a VOM meter to test for correct impedance at the speaker terminals and ensure adequate airflow around the amplifier. Second, if the amplifier shuts down only when the boat is running, the voltage protection circuitry may be engaged because the voltage is outside the 10–16 volt operating range, so have the boat’s charging and electrical system inspected. Finally, if the amplifier only plays at low volume, check for shorted speaker wires or damaged speakers, or speakers operating below the minimum recommended impedance.
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Alexis MorganAug 3, 2025
Why is the red LED flickering with loud music on my KMA KMA150.2 Amplifier?
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  Erica RobertsAug 3, 2025
  If the red LED flickers when the music is loud, it may be due to low battery voltage. Check all connections in your boat’s charging system. You might need to replace or charge your battery or replace the alternator.
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Andrew WalkerAug 8, 2025
How to troubleshoot alternator noise (whining sound with engine’s RPM) in my KMA Amplifier?
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  Shannon ContrerasAug 8, 2025
  To address alternator noise, which manifests as a whining sound that changes with the engine's RPM, you should: check for a damaged RCA (or speaker input) cable, check the routing of the RCA (or speaker input) cable, verify the source unit has proper grounding, and check the gain settings, turning them down if they are set too high.
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Kristie HowardAug 13, 2025
What to do if my KMA KMA150.2 Amplifier has no or low output?
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  Mrs. Mariah YoungAug 13, 2025
  If your amplifier has no or low output, check the balance control on the source unit, inspect the RCA (or speaker input) and speaker output connections, and check for reversed polarity at the speaker(s).
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Christopher MccarthyAug 18, 2025
What to do if green LED is on but there is no output from my KMA KMA150.2 Amplifier?
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  dawn61Aug 18, 2025
  If the green LED is on, but there is no output, check the RCA connections, test speaker outputs with a 'known' good speaker, substitute the source unit with a 'known' good source unit, and check for a signal in the RCA cable feeding the amplifier with the VOM meter set to measure 'AC' voltage.
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Beth SandersAug 23, 2025
How to check KMA KMA150.2 Amplifier if green LED is off and there is no output?
- C
  Christy DelgadoAug 23, 2025
  If the green LED is off and there's no output, use a Volt Ohm Meter (VOM) to check the +12 volt power terminal (it should read +12V to +16V), the remote turn-on terminal (it should read +12V to +16V), check for reversed power and ground connections and the ground terminal for proper conductivity.

Summary

IMPORTANT SAFETY WARNING

PERFORMANCE

INSTALLATION

POWER WIRING

Fuse and Wire Gauge Recommendations

Specifies external fuse requirements and power/ground wire gauge for each KMA model.

OPERATION

Automatic Turn-On Selection

Explains the two automatic turn-on modes: +12V and DC Offset.

TROUBLESHOOTING

LED Indicators and Basic Checks

Explains the meaning of PWR and PRT LEDs and initial troubleshooting steps.

ELECTRONICS LIMITED WARRANTY

Obtaining Warranty Service

Instructions on how to get warranty service, including return procedures.

KMA KMA150.2 Specifications

General

Channels	2
Power at 4 Ohms	150W
Frequency Response	20Hz - 20kHz
Total Harmonic Distortion	<0.1%
Signal-to-Noise Ratio	>90dB
Input Impedance	10k Ohms
Damping Factor	>100