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is a console variable available in all Source Source games.

English (en)

Found in each game's options menu under 'Audio', it controls the speaker configuration type to be used for audio outputting. It has four settings, them being:

Value Description
0 Headphones
2 2 Speakers (Stereo)
4 4 Speakers (Quadraphonic)
5 5.1 Surround
7 7.1 Surround
Icon-Bug.pngBug:On system running Windows Vista and later, due to using DirectSound, the game may output only 5.1 surround despite 7.1 selected or 7.1 audio may not work properly without custom dsound.dll (such as one from Creative Alchemy, DSOAL or IndirectSound and using the "snd_legacy_surround 1" command to allow Source to load dsound.dll files).
Note.pngNote:Some Source games (such as Alien Swarm Alien Swarm, Portal 2 Portal 2, Counter-Strike: Global Offensive Counter-Strike: Global Offensive and later games/mods using engine since Alien Swarm engine branch Alien Swarm engine branch) may not include options to enable 7.1 surround sound without using these console commands.
Note.pngNote:This command is not available in Left 4 Dead 2 Left 4 Dead 2.

See also