Studio Technologies 240 - Manual (Page 16)

Issue 1, August 2013 Model 240 User Guide
Page 16 Studio Technologies, Inc.
user to hear themselves and thus receive
a confidence signal of what is being sent to
the main outputs and possibly the intercom
channels.
As previously discussed, each of the five
available audio sources can be assigned to
the headphone output’s left channel, right
channel, or both the left and right chan-
nels. There is no problem selecting multiple
sources for routing to a headphone output
channel. The sources will sum (add to-
gether) with no loss of level or fidelity. The
Model 240’s circuitry allows any combina-
tion of source assignments to be made.
For example, consider the situation where
a single-channel intercom circuit, with au-
dio present only on pin 3, is connected. In
this case it may be desirable to assign this
intercom audio source to both the left and
right headphone channels. This would en-
tail setting switches SW2-4 and SW2-9 to
their on positions. All other switches would
remain in their off positions.
A more complex application might have
a broadcast-type 2-channel PL intercom
circuit connected to the intercom interface
and a line-level audio signal from a golf
event “spotter” connected to line input 1.
In a case such as this, it would be typical
for intercom pin 2 (PL channel 1) to be
assigned to the headphone’s left channel,
intercom pin 3 (PL channel 2) assigned
to the right channel, and line input 1 also
assigned to the right channel. This would
allow both PL audio channels along with
“spotter” audio to be heard in the head-
phone output. To achieve this would re-
quire that three switches, SW2-3, SW2-6,
and SW2-9, be placed in their on position.
Special applications may benefit from
using the Model 240 in a 3-channel mon-
aural headphone output mixer mode. This
is accomplished by first configuring the headphone output to monaural. (Details
on how to accomplish this are described
in the next section of this guide.) Next
the cue sources are selected. The source
whose level is to be adjusted by the ro-
tary control on the far left side of the front
panel is assigned to the left channel. Then
the cue source whose level is to be ad-
justed by the center control is assigned to
the right channel. Finally sidetone can be
assigned to either of the channels. (If it’s
assigned to both there won’t be an issue
except that the level will increase by 6 dB.)
During operation the user will then be able
to create their desired cue mix using the
three front-panel controls.
There may also be cases where a monau-
ral “single-muff” headset will be connected
to the Model 240’s headphone output. In
this case the desired source(s) should be
routed only to the left channel.
Headphone Normal/Dim
Switch SW1-7 configures whether the level
of the headphone output will dim (attenu-
ate by 20 dB) when one of the talk func-
tions is active.
Figure 7. Headphone normal/dim settings
Two modes are available:
Normal: In this mode the headphone out-
put level will not change when a talk func-
tion is active.
Dim: In this mode the headphone output
level will be reduced (“dimmed”) by 20 dB
whenever any talk function is active.