472
Surround Basics
Surround sound is a common name for various techniques for positioning audio in
reference to the listener. Whereas regular stereo is limited to left/right positioning,
within a relatively narrow field, surround sound opens possibilities of positioning
an audio source anywhere around the listener. Surround sound comes in many
formats. The differences between the formats are in three areas:
• The number of speakers—this varies from 3/2 all the way to 10.2 and beyond.
• The angles of the speakers.
• The intended final coding format—this depends on the media the audio will be
"stored" on: film, broadcast video or DVD, for example.
The most common format is 5.1, which consists of five full-range channels and a
low-frequency effects (LFE) channel (the “.1” in 5.1 is the LFE or sub channel). The
five full-range channels are reproduced by left, right, and center speakers
positioned in front of the listener (L, R, and C for short), and left and right
surround speakers positioned behind the listener (Ls and Rs for short). The LFE
channel can be routed to the main speakers or to a subwoofer that can be
positioned almost anywhere.
The center channel is typically used to lock dialog or sounds to a video screen. The
LFE channel is generally routed to a subwoofer to enhance low audio frequencies
for effects such as explosions or crashes. Audio in this channel is limited to a range
of approximately 25 Hz to 120 Hz.
To Next Page
Loading...