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Model 233 User Guide Issue 1, September 2007
Studio Technologies, Inc. Page 21
SW2-6, and SW2-9 be placed in their on
positions.
Note that 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 audio to the user’s right ear, and
vice versa. A specific application where
this occurs 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 important to select the left- and right-
channel headphone source assignment
accordingly. With the Model 233’s flexible
source selection there’s no reason why
users, such as on-air talent, shouldn’t
have their cue sources assigned correctly.
Special applications may benefit by
using the Model 233 in a 3-channel head-
phone output mixer mode. This is accom-
plished by first configuring the headphone
output to monaural. (Details on how to
accomplish this are described later in this
section of the user guide.) Next the cue
source whose level is to be adjusted by
the rotary control on the far left side of the
front panel is assigned to the left channel.
Finally, the cue source whose level is to be
adjusted by the center control is assigned
to the right channel. During operation the
user will create their desired cue mix using
these two front-panel controls.
There may also be cases where a monau-
ral “single-muff” headset or headphone
will be connected to the Model 233’s
headphone output. In this case the
desired source must be routed only to
the left channel. This is because the
2-conductor plug that’s typically associ-
ated with a mono headset or headphone
will connect only to the tip lead (left chan-
nel) of the headphone output. Signals
assigned to the right channel will not be
heard by the user.
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 51 ohm series protection
resistors, to the headphone output jack.
Figure 7. Headphone output mode settings
The headphone output monaural mode
feature was specifically included so that
a 3-channel headphone mixer mode can
be created. By enabling the mono mode,
the three front-panel user level controls
(“pots”) can be used to create the desired
“mix” of signals being sent to the head-
phone outputs. Many, 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-type switches, to the far 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 far
right control. A third cue signal, sidetone,
can also be enabled. The sidetone level