Studio Technologies 60 - Manual (Page 17)

Issue 2, March 1998 Model 60/61 User Guide
Page 20 Studio Technologies, Inc.
circuit, but provisions have been made to
allow the audio source for the back-panel
headphone output circuit to be changed.
The revised output will give flexibility for
those rare applications that seem to so
often arise! Once modified, the back-panel
headphone output will act more like that of
a line-level output. The alternate choices
are pre-level-control headphone audio or
cue audio. The pre-level- control audio
signal is the same source as the standard
headphone audio signal, but is not ef-
fected by the front-panel level control. This
implementation would be useful where an
audio facility has an existing headphone
amplifier system with level controls. The
other choice of having cue audio would
prove useful for specialized talkback or
cueing applications, such as remote ISDN
configurations. In this configuration, only
when the cue button on the Model 61 is
active will Model 61 microphone audio be
present on the back-panel headphone
output. When the cue button is not
pressed, no audio will be present on the
back-panel headphone output jack.
For details on implementing these alter-
nate routing scheme you’ll need a copy of
the Model 60 schematic diagrams, avail-
able by contacting the factory.
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 refer to the Service Guide,
available from 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 accustomed
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 60 does, too! We understand
that specialized applications such as
mastering and film mixing may require a
more exotic mono function. Sorry, our
hardware simply can’t support it!