Studio Technologies M233-01151 - Manual (Page 33)

Model 233 User Guide Issue 5, November 2014
Studio Technologies, Inc. Page 33
If the line inputs are utilized as cue sourc-
es, adjusting the trim pots may be helpful
in achieving the desired adjustment range
of the level controls. Refer to the Technical
Notes section of this user guide for details.
Monaural Headphone Output Level
Control Operation
As previously discussed, the headphone
output can be set for monaural operation.
This option is specifically provided so
that a headphone mix mode can be cre-
ated. If this has been enabled, the three
front-panel level controls are used as a
cue source mixer. Independent cue inputs
will be assigned to the control on the far
left and the control in the center channel,
serving as two of the mix sources. How
these two controls respond when placed
in their fully counterclockwise position will
depend on the configuration. By default
the output level will be 40 dB below its
maximum level. An alternate configuration
will make the outputs mute. The control on
the far right, sidetone, will always provide
the same function. It is used to add signal
associated with the microphone input to
the headphone output as desired.
Sidetone Operation
As previously covered in this user guide,
a sidetone function can be configured.
Sidetone is defined as the user’s own
voice signal being returned to them as a
headphone cue source. This helps the
user create a more-effective performance
as well as possibly receiving an “on-air” or
“you’re live” indication. Depending on how
it was configured, sidetone audio will be
sent to the left headphone output, the right
headphone output, or both the left and
right headphone outputs. In addition, the
sidetone function can be configured so
that it is active only when the main output
is active, or whenever the main output or
one of the talkback outputs is active. The
level control on the far right adjusts the
sidetone level. When the sidetone level
control is in its fully counterclockwise
position the sidetone signal will always
be fully muted.
Astute readers will realize that sidetone
audio can also be provided from the inter-
com cue sources during Model 233 talk-
back to intercom activity. This “passive”
sidetone is created in the intercom inter-
face’s analog talk/listen hybrid sidetone
(null) circuit. Trim pots allow the intercom
sidetone level to be adjusted over a lim-
ited range. To get maximum performance
when either or both intercom channels are
used as a cue source one simple calibra-
tion process may need to be performed.
This involves adjusting the sidetone (null)
trim pots to their fully counterclockwise
positions, providing minimum sidetone
level. This will reduce the level “build up”
that would occur when both the main and
the intercom sidetone audio signals are
sent to the headphone output. The goal
is for the sidetone level to remain as con-
stant as possible, no matter what func-
tion—main output, talkback-to-line-level
output, or talkback-to-intercom—is active.
Stadium Announce Mode and the
Headphone Outputs
When the system mode has been selected
for stadium announce and the main out-
put is active the input sources assigned to
the left and right headphone outputs will
automatically mute. As expected, in this
state the level controls located in the left
and center positions won’t be active either.
Once the main output returns to the muted
state these two level controls will again
become active. Operation of the sidetone
function, including the sidetone level con-
trol, will not be impacted.