5.1 surround sound

5.1 surround describes a speaker layout: five speakers plus one subwoofer. The "5" is the speakers, the ".1" is the subwoofer that handles low-frequency effects.

The five are: front left, centre, front right, rear left and rear right. The centre speaker carries most dialogue; the rears carry ambience and anything happening behind you.

Why it matters in games

More than in films, because in a game the sound is positional information you act on. Footsteps behind and to the left, a car approaching from the right, a reload in the next room — in a competitive shooter this is genuinely useful, not just atmospheric.

Stereo can suggest left and right. Surround tells you front, back, left and right, which is a different quantity of information.

5.1 vs 7.1 — what is the difference?

7.1 adds two more speakers, placed to the sides, giving you front, side and rear channels rather than just front and rear. The result is smoother movement of sound around you — a car passing from front to back travels through a side channel instead of jumping.

In practice, the difference between 5.1 and 7.1 is much smaller than the difference between stereo and 5.1. Going from two channels to six transforms the experience; going from six to eight refines it.

Room size matters too. In a small room, two extra side speakers may sit so close to the rears that the distinction largely disappears.

Headsets labelled 5.1 or 7.1

A headset has two drivers, one per ear, so a "7.1 headset" is producing a simulated surround field rather than eight physical speakers. That simulation can work well, and on a good headset it gives usable directional information — but it is not the same thing as a speaker system, and a well-made stereo headset often beats a cheap virtual-surround one.

If you are choosing between a good stereo headset and a cheap 7.1 one at the same price, the stereo headset is usually the better purchase.