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Extract LFE Channel

Extract the LFE (subwoofer) channel

Pulls out the LFE/subwoofer channel from a surround file and exports it as mono. Handy for inspecting low-end content, creating separate sub stems, or balancing bass elements independently.

Click to upload file or drag and drop file here

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

Key Facts

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

Overview

This tool extracts the LFE (subwoofer) channel from surround audio files and exports it as a mono file. It's useful for analyzing low-frequency content, creating separate bass stems, or independently balancing bass elements in audio projects.

When to Use

  • •When you need to isolate and analyze the subwoofer channel from a surround mix.
  • •When creating separate low-frequency stems for mixing or mastering.
  • •When adjusting bass levels independently without affecting other channels.

How It Works

  • •Upload a surround audio file (e.g., 5.1 format).
  • •Select the desired output format from options like WAV, MP3, or others.
  • •The tool extracts the LFE channel and exports it as a mono audio file.

Use Cases

Inspecting low-end content in surround mixes for quality control.
Creating separate subwoofer stems for live sound or post-production.
Balancing bass elements independently in music or film audio.

Examples

1. Extracting LFE for Film Mix Review

Audio Engineer
Background
Working on a 5.1 surround mix for a film, need to check the subwoofer channel for excessive rumble.
Problem
The LFE channel might have unwanted low-frequency noise that needs isolation and analysis.
How to Use
Upload the surround audio file, select WAV output format, and run the extraction.
Outcome
A mono WAV file of the LFE channel is generated, allowing for detailed inspection and editing.

2. Creating a Sub Stem for Live Performance

Background
Preparing audio for a live concert where the subwoofer needs a separate feed.
Problem
The main mix includes bass that should be routed differently to the subwoofer.
How to Use
Extract the LFE channel from the surround mix and export it as MP3 for easy integration.
Outcome
A dedicated subwoofer stem is ready for use in the live sound setup.

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FAQ

What is the LFE channel?

The LFE (Low-Frequency Effects) channel is a dedicated channel in surround sound for low-frequency audio, typically handled by a subwoofer.

What audio formats are supported for input?

The tool accepts common surround audio formats; ensure your file is in a supported format like 5.1 surround.

Can I choose the output format?

Yes, you can select from various formats including WAV, MP3, AAC, M4A, OGG, Opus, and FLAC.

Is there a file size limit?

Yes, the audio file must be under 200 MB.

What is the output file?

The output is a mono audio file containing only the extracted LFE channel.

API Documentation

Request Endpoint

POST /en/api/tools/audio-lfe-channel-extract

Request Parameters

Parameter Name Type Required Description
audioFile file (Upload required) Yes -
outputFormat select No -

File type parameters need to be uploaded first via POST /upload/audio-lfe-channel-extract 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-lfe-channel-extract": {
      "name": "audio-lfe-channel-extract",
      "description": "Extract the LFE (subwoofer) channel",
      "baseUrl": "https://elysiatools.com/mcp/sse?toolId=audio-lfe-channel-extract",
      "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]