Studio Technologies 2A 2013 - Manual (Page 14)

Issue 1, October 2013 Model 2A User Guide
Page 14 Studio Technologies, Inc.
The VOX interrupt function is quite special-
ized and may not be used regularly in all
applications. For maximum flexibility, it may
be best to terminate the auxiliary audio
input to a patch point in an audio patch
bay. In this way, a variety of audio sources
can quickly be “patched in” as the VOX
interrupt input source. The VOX feature
may remain unused for months or years,
but when you need it there’s no substitute!
The Model 2A’s VOX interrupt function per-
forms very well, possibly better than you
may think. Try it out and you may soon find
more applications than you expected.
Talent Amplifier Output
The talent amplifier output is designed to
supply power and two audio signals for
up to six Model 32A or Model 33A Talent
Amplifiers. Both audio channels maintain
200 ohm impedances which also allows
connection of party-line (PL) intercom
beltpacks. The talent amplifier output is
connected via a 3-pin male XLR connec-
tor located on the back panel. Pin 1 is
common, pin 2 is 24 volts DC modulated
with IFB channel 1 audio, and pin 3 is IFB
channel 2 audio. For convenience, it is
expected that the talent amplifier output
will be wired to a main input/output (I/O)
panel, along with microphone, camera,
and other related signals. This will allow
easy talent amplifier interconnection using
standard portable microphone or general
audio cables. As a minimum, including
one 3-pin male XLR connector on the I/O
panel for connecting to talent amplifiers
is necessary. But for good operator flex-
ibility it would be better to include two or
three connectors that are “multed” from
the Model 2A’s talent amplifier output. Also
note that each Model 32A and Model 33A
Talent Amplifier has both a female and a
male 3-pin XLR connector. This allows tal-
ent amplifier interconnecting cables to be
“looped” through one talent amplifier and
then on to another. This will simplify and, in
most cases, reduce the amount of cabling
required to connect multiple talent ampli-
fiers to a Model 2A.
Line Outputs
Associated with each of the two IFB chan-
nels is a level output with a nominal signal
level of +4 dBu. The line outputs are elec-
tronically balanced, capacitor-coupled and
designed to drive balanced loads with a
minimum impedance of 2 k (2000) ohms.
Each line output exits the Model 2A via a
3-pin male XLR connector. Prepare the
cable-mounted 3-pin female XLR con-
nectors so that pin 2 is positive (+ or hot),
pin 3 is negative (– or cold), and pin 1 is
shield. To connect to an unbalanced load
connect pin 2 to positive (+ or hot) and pin
3 to shield; do not short (connect) pin 3 to
pin 1.
Some installations may use the line out-
puts to drive wireless IFB transmitters. In
other installations they may be used for
special applications such as feeding a
satellite uplink. For maximum flexibility it
is recommended that the line outputs be
wired via audio patch points, even if the
initial installation doesn’t require it.
The Model 2A’s audio quality and flexibility
make it a useful tool for non-IFB applica-
tions. The Model 2A’s sonic quality is as
good as many audio consoles, storage
devices, etc. This makes using an IFB
channel as a 4-input/1-output audio source
selector for an uplink application complete-
ly valid. Let the Model 2A become a useful
part of your facility’s “bag of tricks!”