Studio Technologies 60A - Manual (Page 19)

Model 60A/61 User Guide Issue 1, June 2003
Studio Technologies, Inc. Page 19
For details on implementing these alter-
nate routing scheme you’ll need a copy
of the Model 60A schematic diagrams,
available by contacting the factory.
Auxiliary Switcher
The auxiliary switcher section allows a
wide range of functions to be easily imple-
mented. By designing the circuitry to be
very universal, both input and output
switchers can be configured. For added
flexibility, termination connection points
were added to the three switcher sections
as well as to the in/out pair of ¼-inch
connectors. These termination points are
in the form of SIP sockets located on the
Model 60A’s printed circuit board. From
the factory a general-purpose set of termi-
nation resistors are installed. Specifically,
10k SIP resistor packs are inserted into
the SIP sockets. This is intended to mini-
mize noise pickup in some implementa-
tions by preventing inputs from being
presented with unterminated signals.
In detail, the terminations are configured
such that the ¼-inch connector pairs A, B,
and C are terminated with 10k ohms
whenever their respective selector switch
is not pressed. In effect, whenever a
button is in the off (out) position, a load
resistor is connected across each of its
respective tip and ring connections. Inter-
ested parties should contact the factory,
via E-mail, and obtain a copy of the Model
60A schematic. This will allow the exact
implementation to be observed, as well as
providing insight on how changes might be
made to optimize the installation.
Model 61 Momentary/Latching Button
Operation
From the factory the Model 61 is set to
have the mono function change state
(latch) each time the button is pressed.
The cue button is set for push to activate
(momentary) operation. In most cases
these operating modes will be appropriate.
However, if you don’t agree with our
choices don’t despair. In the Model 61’s
circuitry both functions can support
momentary and latching operation. A
qualified technician can remove a strap
to make the mono function be momentary
and/or add a strap to make the cue func-
tion latching. For details on implementing
these changes you’ll need a copy of the
Model 61 schematic diagram, available
by contacting the factory.
Control Room Mono Function
Many arguments where had while design-
ing the control room monaural function.
Was the function supposed to be a true
mono function, sending the sum of left
and right to a separate mono control room
output? Was mono to be the sum of left
and right sent to both left and right chan-
nels? What about level build up with
phase coherent signals that are in both
the left and right channels? After much
head scratching it was realized that the
mono function that most people are accus-
tomed to is really a means of observing
the character of a stereo mix, and not a
“true” mono function. To observe the
stereo image of a mix you need to sum the
left and right signals, drop the level of the
sum by 3dB, and send the result out the
left and right outputs. This is what virtually
all recording consoles implement, and is
what the Model 60A does, too! We under-
stand that specialized applications such as
mastering and film mixing may require a
more exotic mono function. Sorry, our
hardware simply can’t support it!