Theatre Design & Technology - Winter 1981 - 24

At this time VCA's are still rather costly-$150 to $500 per
channel. Most manufacturers have chosen to make VCA's an
option. No manufacturer has yet made remote/memory control
provisions for the pre-amp input selector or the bus assign
switches. In the idealized control board detailed in these pages,
VCA's are shown in input, pre-set and output faders. These
should be viewed as useful, though expensive, options.
Thus far we have considered the general applications and
functional requirements of a theatre sound control board. The
board itself is composed of several parts which are shown in
block diagrams and some control panel layouts:
Pre-amp module (Figs. 3 and 4)
Echo return module (Fig. 5)
Internal bus structure, quad panners, sub-masters, and tape
machine controls (Fig. 6)
Pre-set master module (Figs. 7 and 8)
Output module (Fig. 7)

T

TO

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u!
U1

12

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III
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VI

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:

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~

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~~ 2~a:

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SO LO ----4 *",""-~"""'----llf--'

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TYPICAL
VCA

Y

0

o--SUB B
SUB C
SUB D

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CHANNELS

2

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Figure 7 Output and Matrix functional diagram.

~ 4-

5

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MONITORS

3

.LOCAL

L
CONTROL.

Figure 8 Pre-set Master
Module panel layout.

A typical manufactured theatre board without VCA's is shown in
Figure 9.
The pre-amp allows the selection of either of two inputs (A
and B) which may be line or mic level. The mic-Ievel input may
be furnished with phantom power for a condenser microphone
when required. The gain trim on the input is useful in normalizing
the level within the pre-amp, thus allowing the main fader to ride
around the "0" point for most activities. The hi-pass filter may be
adjusted for removal of low-frequency noise such as rumble and
movement noises from the stage. an external link may be
normaled through a patch panel whereby external processing
devices (flanger, de-esser, noise gate, etc.) may be patched in
as required. The equalizer section, which may (and should) be
by-passed when not in use, offers cut and boost of the low and
high ends of the sound spectrum. The mid-band control creates
a peak or dip which may be adjusted in gain, in frequency, and in
width (from about one octave to about '/3 octave wide). Following a phase inverting switch is the main channel fader which
may be a VCA with assignable control. The mute switch allows

Figure 9 Typical theatre sound board without YeA's.

10

~~ 2~a:
~~ 2~a:
:c~~ 2~a:
II

12

13

~~~ 2~O:8
1+

22

Theatre Design & Technology

USITTlWinler, 1981



Table of Contents for the Digital Edition of Theatre Design & Technology - Winter 1981

Contents
Theatre Design & Technology - Winter 1981 - 1
Theatre Design & Technology - Winter 1981 - 2
Theatre Design & Technology - Winter 1981 - 3
Theatre Design & Technology - Winter 1981 - Contents
Theatre Design & Technology - Winter 1981 - 5
Theatre Design & Technology - Winter 1981 - 6
Theatre Design & Technology - Winter 1981 - 7
Theatre Design & Technology - Winter 1981 - 8
Theatre Design & Technology - Winter 1981 - 9
Theatre Design & Technology - Winter 1981 - 10
Theatre Design & Technology - Winter 1981 - 11
Theatre Design & Technology - Winter 1981 - 12
Theatre Design & Technology - Winter 1981 - 13
Theatre Design & Technology - Winter 1981 - 14
Theatre Design & Technology - Winter 1981 - 15
Theatre Design & Technology - Winter 1981 - 16
Theatre Design & Technology - Winter 1981 - 17
Theatre Design & Technology - Winter 1981 - 18
Theatre Design & Technology - Winter 1981 - 19
Theatre Design & Technology - Winter 1981 - 20
Theatre Design & Technology - Winter 1981 - 21
Theatre Design & Technology - Winter 1981 - 22
Theatre Design & Technology - Winter 1981 - 23
Theatre Design & Technology - Winter 1981 - 24
Theatre Design & Technology - Winter 1981 - 25
Theatre Design & Technology - Winter 1981 - 26
Theatre Design & Technology - Winter 1981 - 27
Theatre Design & Technology - Winter 1981 - 28
Theatre Design & Technology - Winter 1981 - 29
Theatre Design & Technology - Winter 1981 - 30
Theatre Design & Technology - Winter 1981 - 31
Theatre Design & Technology - Winter 1981 - 32
Theatre Design & Technology - Winter 1981 - 33
Theatre Design & Technology - Winter 1981 - 34
Theatre Design & Technology - Winter 1981 - 35
Theatre Design & Technology - Winter 1981 - 36
Theatre Design & Technology - Winter 1981 - 37
Theatre Design & Technology - Winter 1981 - 38
Theatre Design & Technology - Winter 1981 - 39
Theatre Design & Technology - Winter 1981 - 40
Theatre Design & Technology - Winter 1981 - 41
Theatre Design & Technology - Winter 1981 - 42
Theatre Design & Technology - Winter 1981 - 43
Theatre Design & Technology - Winter 1981 - 44
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