MP3Surround Encoder

mp3 Surround enables high-quality surround sound at bit rates comparable to those currently used to encode stereo mp3 material.

It is backwards compatible to stereo mp3; a legacy mp3 device plays back mp3 Surround as high quality stereo. mp3D is a supplement to mp3 Surround decoder which improves the headphones playback of stereo mp3 files.