# Stereo to Surround

Upmix a stereo file to a surround sound format

> Canonical page: https://elysiatools.com/en/tools/stereo-to-surround

- **Category:** Media

- **Keywords:** audio, stereo, surround, 5.1, upmix, lfe, center, rear, pan

## Overview

Upmixes stereo audio into a 5.1-style layout. Front left/right are preserved, while center, surround, and LFE channels are synthesized with adjustable strength. Useful for creating immersive playback from stereo sources or prepping content for multi-speaker setups.

## Inputs

- **Audio File** (file): Select a stereo audio file
- **Center Channel Level (0-1.0)** (range): Strength of the synthesized dialog/center channel.
- **Rear/Surround Level (0-1.0)** (range): Ambience sent to surround speakers.
- **LFE/Sub Level (0-1.0)** (range): Amount of low end routed to the LFE channel.
- **Output Format** (select)

## When to use

- To create a surround sound experience from stereo music or audio tracks.
- When preparing audio content for multi-speaker setups like home theaters.
- To upmix stereo files for immersive listening on surround sound systems.

## How it works

- Upload your stereo audio file in a supported format.
- Adjust the center, rear, and LFE channel levels using the provided sliders.
- Select your desired output format from options like WAV, MP3, or FLAC.
- Process the file to generate the surround sound version.

## Use cases

- Enhancing stereo music tracks for a home theater system.
- Converting podcast audio to surround sound for immersive listening.
- Preparing audio for video games or VR applications that require multi-channel audio.

## Frequently asked questions

### What audio file formats can I upload?

The tool accepts any audio file format supported by your browser, such as MP3, WAV, AAC, and more.

### How do I adjust the surround channel levels?

Use the sliders for Center Level, Rear Level, and LFE Level to set values between 0 and 1.0.

### What is the maximum file size allowed?

The audio file must be under 200 MB.

### Can I choose the output format?

Yes, you can select from WAV, MP3, AAC, M4A, OGG, Opus, or FLAC.

### Does this tool work with mono audio files?

No, it is designed for stereo audio files to upmix to surround sound.

## Related tools

- [Audio Change Bitrate](https://elysiatools.com/en/tools/audio-change-bitrate): Re-encode audio to a new bitrate while keeping the same format
- [Audio Codec Swap](https://elysiatools.com/en/tools/audio-codec-swap): Change the codec of an audio file within a chosen output format
- [DTS to AC3 Converter](https://elysiatools.com/en/tools/dts-to-ac3): Convert DTS audio to AC3 (Dolby Digital) format with bitrate and channel controls
- [AAC to M4A Converter](https://elysiatools.com/en/tools/aac-to-m4a): Convert AAC audio files to M4A (MPEG-4 Audio) format with quality and channel controls
- [AAC to OGG Converter](https://elysiatools.com/en/tools/aac-to-ogg): Convert AAC audio files to OGG Vorbis format with quality and channel controls
- [AMR to MP3 Converter](https://elysiatools.com/en/tools/amr-to-mp3): Convert AMR (Adaptive Multi-Rate) audio files to MP3 format
- [Audio Splicer](https://elysiatools.com/en/tools/audio-splicer): Splice multiple audio files into one single audio file with customizable output format
- [Batch WAV Audio Converter](https://elysiatools.com/en/tools/batch-wav-converter): Convert multiple WAV files to OGG, AAC, M4A, and OPUS formats with quality settings, bitrate control, and batch processing

## 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.