Theatre Design & Technology - Winter 1999 - 15

*

In the theatre
by

N -io-n-a-tl1an

dar

mg

- - Thinking Beyond Stereo

- - Adding a Center Channel Speaker

Many of our prerecorded sound sources are in stereo
which suggests stereo playback systems for the theatre.
nfortunately, theatre sound exposes the principallimitation of stereo playback: the stereo image only works for a
small group of people near the center line of the house.
Most audience members will hear sound primarily from
the speaker closest to them, which tends to disassociate
the production's aural image from its visual image. The
"phantom" center aural image produced when the listener sits equidistant from two stereo speakers has a very
narrow range of effectiveness. As the listener gets closer
to one speaker than the other the Haas or precedence effect predicts that the listener \villiocalize the sound to the
closer speaker, even if he or she continues to receive
considerable sound from the more distant speaker.
MO\~e sound designers have known this for years and
cinema systems have therefore included a center channel
behind the screen.

In order to provide a more stable aural image to the au-

dience, many theatre playback systems use three principle playback speakers or clusters of speakers to keep
the audience's aural focus synchronized with the visual
images on the stage. These three positions are normally
defined as left, center, and right (UCIR). Any sound mixing board \vith at least three outputs of any type could
drive such a speaker design. However, the output architecture of the mixer might make operation a bit cumbersome.
nlil fairly recently only expensive mixers included
dedicated Left, Center and Right outputs. However, several manufacturers including Crest (Crest GT or X-Eight),
DDA (DDA CS-3 or CS-8) , and Mackie (SR40-8) nowoffer UCIR mixers under $10,000. UCIR mixers intended
for theatre reinforcement and playback include three
master faders (rather than two) to control speaker configurations. Some UCIR mixers sum the left and right
channel to create the center channel. However, most of
TZ>&T

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Table of Contents for the Digital Edition of Theatre Design & Technology - Winter 1999

Contents
Theatre Design & Technology - Winter 1999 - 1
Theatre Design & Technology - Winter 1999 - 2
Theatre Design & Technology - Winter 1999 - 3
Theatre Design & Technology - Winter 1999 - Contents
Theatre Design & Technology - Winter 1999 - 5
Theatre Design & Technology - Winter 1999 - 6
Theatre Design & Technology - Winter 1999 - 7
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