These are speaker types defined for use with AudioSettings.speakerMode.
Your project's default speaker mode can be set in the Audiomanager through Edit->Project Settings->Audio.
Additional resources: AudioSettings, Audio Manager.
Mono | Channel count is set to 1. The speakers are monaural. |
Stereo | Channel count is set to 2. The speakers are stereo. This is the editor default. |
Quad | Channel count is set to 4. 4 speaker setup. This includes front left, front right, rear left, rear right. |
Surround | Channel count is set to 5. 5 speaker setup. This includes front left, front right, center, rear left, rear right. |
Mode5point1 | Channel count is set to 6. 5.1 speaker setup. This includes front left, front right, center, rear left, rear right and a subwoofer. |
Mode7point1 | Channel count is set to 8. 7.1 speaker setup. This includes front left, front right, center, rear left, rear right, side left, side right and a subwoofer. |
Prologic | Channel count is set to 2. Stereo output, but data is encoded in a way that is picked up by a Prologic/Prologic2 decoder and split into a 5.1 speaker setup. |