12.5 What do I need for surround sound?
Description
This article is from the rec.audio.* FAQ, by with numerous contributions by Bob Neidorff others.
12.5 What do I need for surround sound?
"Surround Sound" has referred to a number of different products
over the years. Many mass-fi receivers have "Surround Sound"
buttons that do little more than muck up the imaging.
In recent years the term "Surround Sound" has become synonymous
with the surround systems produced by Dolby Laboratories. Dolby
Surround comes in several flavors, such as passive surround
(which simply decodes the phase information and sends it to the
rear speakers) and the more advanced system called Pro Logic.
Pro Logic system uses computer circuitry to route directional
information to the appropriate speakers.
Generally, one needs at least two more speakers beyond the main
stereo pair. Advanced Pro Logic systems such as the Lexicon and
Fosgate can accommodate several more speakers beyond the two
additional ones (usually placed in the rear). Often one can
find Pro Logic systems with two front, two rear, two side, as
well as a center channel speaker for dialogue.
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