Studio Technologies 212 2013 - Manual (Page 19)

Model 212 User Guide Issue 5, May 2013
Studio Technologies, Inc. Page 19
In some cases a user may wish to wear a
headset or a pair of headphones in a left/
right orientation opposite of what’s usual.
In this situation the transducer designated
for the left ear would actually supply au-
dio to the user’s right ear, and vice versa.
A specific application where this can oc-
cur is when on-air talent needs to have a
headset’s boom microphone come across
the right side of their face, rather than the
more-typical left side. In this case it’s im-
portant to select the left- and right-channel
headphone source assignment accord-
ingly. With the Model 212’s flexible source
selection there’s no reason why users,
such as on-air talent, shouldn’t have their
cue sources assigned correctly.
There may be cases where a monaural
“single-muff” headset or headphone will
be connected to the Model 212’s head-
phone output. In this case the desired cue
source(s) should be routed only to the left
channel. No sources should be assigned
to the right channel. This will eliminate the
short-circuit current that could occur when
a 2-conductor (monaural) plug is mated
with the Model 212’s 3-conductor (stereo)
headphone output jack.
Headphone Output Mode
Switch SW1-6 allows a monaural head-
phone output to be created. This is accom-
plished by summing (adding) the selected
left- and right-channel cue signals. The
combined signals are sent to both the left-
and right-channel headphone output driver
circuits. The outputs of these circuits con-
nect, by way of 100 ohm series protection
resistors, to the headphone output jack.
The headphone output monaural mode fea-
ture was specifically included so that a spe-
cial “2-channel headphone mix” mode can
be created. By enabling the mono mode,
the two front-panel user level controls
(“pots”) can be used to create the desired
“mix” of signals being sent to the head-
phone output. Many applications, especially
in production settings, can benefit from this
capability. The desired cue sources must
be carefully assigned to take advantage of
the monaural mode. The first cue source
should be assigned, using the DIP switch-
es, to the left channel. Its output level will
be adjusted by the left control. The second
cue source should be assigned to the right
channel. Its output level will be adjusted by
the right control.
There is one limitation related to the head-
phone mono output mode. It’s the fact
that the output will be 2-channel mon-
aural. Whatever signal is present on the
headphone output’s left channel will also
be present on the right channel. A stereo
headphone mix can’t be created. But in
most cases this limitation won’t overshadow
the benefit of being able to create the mix.
For signal-flow clarification please review
the block diagram located at the end of this
user guide.
Operating Modes
The twelve switches associated with switch
assembly SW3 are used to configure the
Model 212’s operating modes. Technically,
these switches “talk” to the micro-controller
integrated circuit and associated software
that give the Model 212 its “smarts.” The
software has been carefully designed to
Figure 8. Headphone output mode settings