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
VI
u!
U1
12
:J
III
I-
UI
VI
/3
W
a:
D..
1
I'\-
I
INPUT
IPRE,SET MASTER
:
L_r::::!9~~E
j
SOLO ยข -----------II-------I---l---r!'--f).....j(
CONTROL-----------II------j---l--'------./
~J
EXTERNAL
0
LINK5~
U
~
~
.LOCAL
I
-W-~~
2~O:
~~ 2~68
~~ 2~a:
U 2~a:
~
~~~ 2~a:
~~ 2~a:
~~ 2~a:
I
SO LO ----4 *",""-~"""'----llf--'
'~~A
TYPICAL
VCA
Y
0
o--SUB B
SUB C
SUB D
I-- (N) OUTPUT----j
CHANNELS
2
6
7
~
2~68
~~~ 2~68
~ 2~68
.LOCAL
~ ~
8
9
.LOCAL
~ ~
Roo.....
Figure 7 Output and Matrix functional diagram.
~ 4-
5
R
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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https://www.nxtbook.com/nxtbooks/hickmanbrady/tdt_1968Feb
https://www.nxtbook.com/nxtbooks/hickmanbrady/tdt_1967Dec
https://www.nxtbook.com/nxtbooks/hickmanbrady/tdt_1967Oct
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https://www.nxtbook.com/nxtbooks/hickmanbrady/tdt_1966Dec
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https://www.nxtbook.com/nxtbooks/hickmanbrady/tdt_1966Feb
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