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Model 233 User Guide Issue 1, September 2007
Studio Technologies, Inc. Page 9
with satellite transmission systems, are
present. In effect the Model 233’s sidetone
function adds the “minus” part to a “mix
minus” cue.
Several configurable parameters allow
the sidetone function to be tailored to the
needs of a specific Model 233 installation.
The sidetone function can be configured
to route audio to the left, right, or left and
right headphone outputs. It can also be
completely disabled. Sidetone can also
be configured to be active only when
the main output is active, or to be active
anytime the main output or either of the
talkback outputs is active.
Headphone Output
Three rotary controls are provided for
user adjustment of the headphone output.
Two of the controls adjust the levels of the
externally connected sources. The third
control is used to set the level of the side-
tone function.
For flexibility the actual functioning of the
two controls associated with the external
sources is configurable. For traditional
on-air sports applications they can be
selected to the dual level control mode
which provides independent control of the
left and right channel volume. For use with
stereo cue signals, or to support user pref-
erence, the level/balance mode can be
selected. In this mode one control adjusts
the overall level of both the left and right
channels, while the other allows adjust-
ment of the left/right level balance. To help
minimize the chance of broadcast cues
being missed, both level control modes
can be configured so that a minimum
headphone output level is maintained.
Alternately, the headphone output can be
set to fully mute when these controls are
at their minimum position.
A headphone control reverse mode is
provided specifically for on-air television
applications where a headset with boom
microphone is used. The reverse mode
ensures that no matter which headset
orientation is used by the talent, the two
“pots” controlling the external sources will
always work intuitively. This will result in a
comfortable work environment, allowing
the “left” control to impact the level to the
talent’s left ear while the “right” control
impacts the right.
The sidetone level control is dedicated to
adjusting the level of the mic audio signal
that’s routed to the headphone outputs.
Configuration switches allow which of the
headphone outputs—left, right, or both—
will receive the sidetone signal. When the
sidetone level control is set to its minimum
position the sidetone level is always set to
be fully muted.
Provision has been made to support ap-
plications where a monaural cue feed is
desired. A configuration switch allows the
summing (combining) of the selected left
and right headphone sources. In addition
to creating a dual-channel mono output it
also allows the level controls to be config-
ured as a simple 3-channel mixer.
The headphone output is optimized to
meet the needs of contemporary head-
phones and headsets. Specifically, the
output circuits act as voltage, rather than
power, drivers. In this configuration they
can provide high output levels with very
low distortion and noise, along with mini-
mal current consumption. The output cir-
cuits are configured to safely drive stereo
or mono loads. This ensures that all types
of headphones, headsets, and earpieces
can be directly connected.