How to Measure Loc Output Voltage: Unleash the Power of Your Audio System

When optimizing your car’s audio system, measuring the line output converter (LOC) output voltage is crucial to ensure peak performance and sound quality. However, for many car audio enthusiasts, this task can be daunting.

Fear not, because in this article, we’ll walk you through the process of measuring LOC output voltage easily, turning you into an audio system tuning wizard in no time!

Understanding Line Output Converters

A line output converter (LOC) is a device that converts high-voltage speaker-level signals into low-voltage preamp-level signals, allowing you to connect an amplifier to your factory car stereo system.

Measuring the output voltage of your LOC ensures the correct voltage level is sent to the amplifier, preventing distortion and ensuring optimal audio performance.

4 Simple Steps to Measure LOC Output Voltage

  1. Gather Your Tools

To measure the LOC output voltage, you’ll need the following tools:

  • A digital multimeter (DMM)
  • A test tone CD or MP3 file with a sine wave at your desired frequency (usually 50 Hz for subwoofers, 1 kHz for full-range speakers)
  1. Set Up the Test Tone

Insert the test tone CD or connect your audio device playing the MP3 file to your car stereo. Set the volume to around 75% of the maximum level to prevent distortion during testing.

  1. Configure the Digital Multimeter

Turn on your digital multimeter and set it to measure AC voltage. Connect the black (negative) probe to the LOC’s ground terminal and the red (positive) probe to one of the LOC’s output channels.

  1. Measure the Output Voltage

With the test tone playing, observe the voltage reading on your multimeter. The voltage should be within the acceptable range specified by your amplifier’s manufacturer. If the voltage is too high or low, adjust the gain settings on your LOC until the voltage reading falls within the recommended range.


Q: What is the ideal LOC output voltage?

A: The ideal LOC output voltage depends on your amplifier’s input sensitivity. Consult your amplifier’s manual for the recommended voltage range.

Q: Can I measure LOC output voltage without a multimeter?

A: A digital multimeter is the most accurate and reliable tool for measuring LOC output voltage. Other methods, such as using an oscilloscope or by ear, are less accurate and not recommended.

Q: Can I damage my car audio system by measuring the LOC output voltage?

A: As long as you follow the correct procedure and use the appropriate tools, measuring the LOC output voltage should not damage your car audio system.

How to Measure Loc Output Voltage Summary

Measuring LOC output voltage is critical in optimizing your car’s audio system, ensuring peak performance, and preventing distortion. By following these four simple steps and using a digital multimeter, you can accurately measure your LOC output voltage and fine-tune your audio system for the best possible sound quality.

So, grab your tools, crank up the test tone, and get ready to unleash the full potential of your car’s audio system!

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