2D 5.1 Channels

 

5.1 Channels

The "standard" format for six-channel surround system is the 5.1 mix. All 5.1 systems use the same speaker channels and configuration, having a front left and right, a center channel, two surround channels (left and right) and the low-frequency effects channel designed for a subwoofer.

Regarding music, the main goal of 5.1 surround sound is a proper localization and equability of all acoustic sources for a centered positioned audience. Therefore, ideally five matched speakers should be used.

For play-back of 5.1 music recommendations of the International Telecommunication Union (ITU) have been released and propose the following configuration (ITU-R BS 775):

-        five speakers of the same size for front, center and surround

-        identical distance from the listeners for all five speakers

-        angle adjustment regarding viewing direction of audience: center 0°, front ±22.5° for movies ±30° for music, surround ±110°

This is an important frame of reference to keep in mind for the subsequent configurations discussed below. Going straight out the listeners eyes to the front of the room defines the 00 reference for all angles.