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Surround to Stereo

Downmix a surround sound file (e.g., 5.1) to stereo

Downmix surround audio (like 5.1) to stereo with controllable center, surround, and LFE contribution. Keeps left/right content intact while blending center dialogue and ambience at adjustable levels so the stereo mix remains clear and balanced.

Click to upload file or drag and drop file here

Maximum file size: 200MB Supported formats: audio/*

0 0.7 1

How much of the center/dialog channel to blend into stereo.

0 0.6 1

Ambience/rear contribution to the stereo mix.

0 0.35 1

How much sub/LFE energy to keep in stereo.

Key Facts

Category
Media
Input Types
file, range, select
Output Type
file
Sample Coverage
4
API Ready
Yes

Overview

This tool converts surround sound audio files, such as 5.1 mixes, into stereo format. It allows precise control over how center dialogue, surround ambience, and low-frequency effects are blended, ensuring a clear and balanced stereo output for various playback scenarios.

When to Use

  • •When you need to play surround audio on stereo devices like headphones or standard speakers.
  • •For editing or mixing audio in software that only supports stereo tracks.
  • •To reduce file size while maintaining audio quality for distribution or streaming.

How It Works

  • •Upload your surround audio file (e.g., 5.1 format in WAV, FLAC, or similar).
  • •Adjust the mix levels for center, surround, and LFE channels using the provided sliders.
  • •Select your preferred output format from options like MP3, AAC, WAV, or others.
  • •Download the converted stereo file directly to your device.

Use Cases

Converting movie or TV show audio for playback on mobile devices or standard speakers.
Preparing surround soundtracks for podcast episodes or online video content.
Creating stereo versions of music mixes for wider distribution on streaming platforms.

Examples

1. Podcast Audio Cleanup

Podcaster
Background
A podcaster has an interview recorded in 5.1 surround sound from a studio, but the ambient noise is too prominent for a clean listen.
Problem
The podcast platform requires stereo audio, and the original mix has distracting background sounds.
How to Use
Upload the 5.1 audio file, set the surround level to 0.3 to reduce noise, increase the center level to 0.9 for clear dialogue, and output as MP3.
Outcome
A polished stereo podcast episode with focused dialogue and minimal background interference.

2. Home Theater to Headphones

Background
A user wants to enjoy a movie with 5.1 audio on headphones during a commute, but the surround effects are lost or unbalanced.
Problem
Standard headphones cannot reproduce surround sound, leading to a flat or uneven audio experience.
How to Use
Upload the movie's audio track, adjust the LFE level to 0.4 for balanced bass, keep surround level at 0.5 for subtle ambience, and choose AAC format for compatibility.
Outcome
An immersive stereo mix optimized for headphone listening, with clear dialogue and controlled bass.

Try with Samples

audio, file
Copyright-Free AAC Audio Samples
High-quality AAC encoded audio samples for testing and development, featuring nature sounds and meditation music with excellent compression
preferred input family audio
audio
WebRTC Real-Time Communication Samples
Comprehensive WebRTC samples for peer-to-peer audio/video communication, data channels, screen sharing, and signaling server implementation
preferred input family audio
audio
Copyright-Free MP3 Audio Samples
Collection of royalty-free audio samples for testing and development purposes including nature sounds, meditation music, and ambient audio
preferred input family audio
audio
Copyright-Free WAV Audio Samples
Uncompressed PCM WAV audio samples for testing and development, mirrored from MP3 set with nature sounds and meditation music
preferred input family audio
audio

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FAQ

What audio formats are supported for input?

The tool accepts common surround audio files, such as 5.1 encoded WAV, FLAC, or MP3, up to 200 MB in size.

How do the mix levels affect the stereo output?

Center level controls dialogue clarity, surround level adjusts ambient sounds, and LFE level manages bass content to balance the mix.

Can I process multiple files at once?

No, this tool handles one file per conversion to ensure precise control over each downmix.

What is the default output format?

The default is MP3, but you can choose from AAC, M4A, OGG, Opus, FLAC, or WAV based on your needs.

Is there a limit on file size or duration?

Yes, the maximum file size is 200 MB per upload, but there is no specific duration limit as long as the file size is within bounds.

API Documentation

Request Endpoint

POST /en/api/tools/audio-surround-to-stereo

Request Parameters

Parameter Name Type Required Description
audioFile file (Upload required) Yes -
centerLevel range No How much of the center/dialog channel to blend into stereo.
surroundLevel range No Ambience/rear contribution to the stereo mix.
lfeLevel range No How much sub/LFE energy to keep in stereo.
outputFormat select No -

File type parameters need to be uploaded first via POST /upload/audio-surround-to-stereo to get filePath, then pass filePath to the corresponding file field.

Response Format

{
  "filePath": "/public/processing/randomid.ext",
  "fileName": "output.ext",
  "contentType": "application/octet-stream",
  "size": 1024,
  "metadata": {
    "key": "value"
  },
  "error": "Error message (optional)",
  "message": "Notification message (optional)"
}
File: File

AI MCP Documentation

Add this tool to your MCP server configuration: 

{
  "mcpServers": {
    "elysiatools-audio-surround-to-stereo": {
      "name": "audio-surround-to-stereo",
      "description": "Downmix a surround sound file (e.g., 5.1) to stereo",
      "baseUrl": "https://elysiatools.com/mcp/sse?toolId=audio-surround-to-stereo",
      "command": "",
      "args": [],
      "env": {},
      "isActive": true,
      "type": "sse"
    }
  }
}

You can chain multiple tools, e.g.: `https://elysiatools.com/mcp/sse?toolId=png-to-webp,jpg-to-webp,gif-to-webp`, max 20 tools.

Supports URL file links or Base64 encoding for file parameters.

If you encounter any issues, please contact us at [email protected]