# Audio Stereo Correlation Meter

Visualize stereo phase correlation for mono compatibility checks

> Canonical page: https://elysiatools.com/en/tools/audio-stereo-correlation-meter

- **Category:** Media

- **Keywords:** audio, stereo, correlation, phase, meter, visualize

## Overview

Renders a phase correlation meter image using FFmpeg aphasemeter.

## Inputs

- **Audio File** (file): Select an audio file
- **Image Width** (text): e.g., 800
- **Image Height** (text): e.g., 400
- **Enable Phase Detection Overlay** (checkbox)
- **Mono Detection Tolerance (0-1)** (number)
- **Out-of-Phase Angle Threshold** (number)
- **Min Phasing Duration (s)** (number)

## When to use

- When preparing stereo audio for mono playback to ensure no cancellation occurs.
- During audio mastering to detect and correct phase problems in mixes.
- For analyzing stereo width and balance in music or podcast production workflows.

## How it works

- Upload a stereo audio file in a supported format like MP3 or WAV.
- Adjust optional parameters such as image dimensions and phase detection settings.
- The tool processes the audio with FFmpeg aphasemeter to generate a correlation meter image.
- Download the resulting image to visualize phase correlation over time.

## Use cases

- Audio engineers verifying mono compatibility before broadcast or streaming.
- Podcast producers ensuring voice recordings maintain clarity in mono playback.
- Musicians checking stereo mixes for balanced phase correlation during mastering.

## Frequently asked questions

### What audio formats are supported?

Common formats like MP3, WAV, FLAC, and others compatible with FFmpeg are supported.

### How do I interpret the correlation meter?

Values near +1 indicate good mono compatibility, while values near -1 suggest out-of-phase audio that may cancel in mono.

### What does the phase detection overlay show?

It highlights areas with potential phasing issues based on the tolerance and angle threshold settings.

### Can I customize the phase detection sensitivity?

Yes, use the 'Mono Detection Tolerance' and 'Out-of-Phase Angle Threshold' options to adjust sensitivity.

### What is the 'Min Phasing Duration' used for?

It sets the minimum duration in seconds for flagging phasing issues, ignoring brief fluctuations.

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## Samples

- [Copyright-Free FLAC Audio Samples](https://elysiatools.com/en/samples/flac-samples): Lossless FLAC audio samples for testing and development, mirrored from MP3 set with nature sounds and meditation music
- [Copyright-Free MP3 Audio Samples](https://elysiatools.com/en/samples/mp3-samples): Collection of royalty-free audio samples for testing and development purposes including nature sounds, meditation music, and ambient audio
- [Copyright-Free WAV Audio Samples](https://elysiatools.com/en/samples/wav-samples): Uncompressed PCM WAV audio samples for testing and development, mirrored from MP3 set with nature sounds and meditation music
- [Copyright-Free Raw PCM Audio Samples](https://elysiatools.com/en/samples/pcm-samples): Raw PCM s16le audio samples featuring nature ambience and relaxing music for waveform, playback, and conversion workflows

## Related content

- [Audio Channel Routing and Delivery Verification](https://elysiatools.com/en/hubs/audio-channel-routing): Route, split, join, and convert mono or stereo audio while preserving left/right intent and checking the final file before delivery.