Downmixed

Downmixed refers to the process of converting an audio signal from a higher channel count to a lower channel count. This is commonly encountered when a surround sound audio track, such as 5.1 or 7.1 surround, is played on a stereo system with only two speakers. In such a scenario, the surround sound information is "downmixed" to stereo, meaning the audio from the rear and center channels is mixed into the left and right channels.

The purpose of downmixing is to ensure that audio content remains accessible and enjoyable on a wider range of playback systems. Without downmixing, a surround sound production played on stereo equipment would result in missing or incomplete audio information, as the intended speaker channels would not exist. Various algorithms and techniques are employed for downmixing, aiming to preserve as much of the original spatial and directional cues as possible within the limitations of the lower channel count.

Different downmixing approaches can yield slightly different results. Some methods prioritize maintaining the overall balance of the mix, while others attempt to preserve specific elements, such as dialogue from the center channel. Professional audio engineers often use specialized tools and settings to achieve optimal downmixing results for broadcast, streaming, or home media playback. The effectiveness of downmixing is a factor in how well surround sound content translates to stereo environments.