A 5.1 mix in Dolby refers to a surround sound audio format commonly used in film, television, and home theater systems. The "5" in 5.1 represents five discrete audio channels, while the ".1" represents the low-frequency effects (LFE) channel dedicated to bass sounds.

In a 5.1 mix, the audio is divided into five primary channels:

Front Left: This channel carries sound primarily from the left side of the screen or soundstage.

Front Center: The center channel handles dialogue and other central audio elements, creating a focused and clear sound image.

Front Right: Similar to the Front Left channel, this channel carries sound primarily from the right side of the screen or soundstage.

Surround Left: This channel provides ambient or background sound from the left side of the listening area, creating a sense of spaciousness and immersion.

Surround Right: Similar to the Surround Left channel, this channel provides ambient or background sound from the right side of the listening area.

The ".1" LFE channel is dedicated to low-frequency effects, such as deep bass sounds and explosions. This channel adds impact and depth to the audio experience.

When mixed in Dolby, these channels are encoded and decoded using Dolby Digital technology, allowing for a more immersive and realistic audio experience. This format is commonly used in cinemas, home theater systems, and surround sound setups to deliver a more immersive and spatial audio experience, enhancing the overall viewing or listening experience.