Studio Technologies IFB Plus 2005 - Manual (Page 11)

Model 2 User Guide Issue 8, December 2005
Studio Technologies, Inc. Page 11
the AUX input level to be adjusted for cor-
rect VOX operation. It is anticipated that this
pot will be adjusted only upon initial instal-
lation or during maintenance, and is not
considered an operator function. Refer to
the Technical Notes section of this guide for
details on setting the trim pot.
The auxiliary audio connection is made via
a 3-pin female XLR-type connector on the
back panel. The auxiliary audio input circuit-
ry is direct coupled, electronically balanced
with an input impedance of 24 k ohms.
Prepare the mating connector so that pin 2
is positive (+ or hot), pin 3 is negative (– or
cold), and pin 1 is shield. With unbalanced
signals connect pin 2 to positive, and pins 1
and 3 to shield.
The VOX interrupt function is quite special-
ized and may not be used regularly in your
facility. For maximum flexibility, it may be
best to terminate the auxiliary audio input to
a patch point in the audio patch bay. In this
way, a variety of audio sources can quickly
be selected as the VOX interrupt input
source. The VOX feature may sit unused
for months or years, but when you need it
there’s no substitute! The Model 2’s VOX
interrupt works quite well, better than you
may think. (Actually better than we thought,
too, until we tested it!) 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 audio signals for up to
four Model 32 or 33 Talent Amplifiers. The
talent amplifier output exits the Model 2 via
one 3-pin male XLR-type connector. Pin 1 is
common, pin 2 is +22 Vdc modulated with
channel 1 audio, and pin 3 is channel 2 au-
dio. For convenience, it is expected that the
talent amplifier output will be wired to a main
distribution panel, along with microphone,
camera, and other various connections.
This will allow easy talent amplifier connec-
tion using standard flexible microphone
cable. The distribution panel does not need
multiple talent amplifier output connectors
which are “multed” from the Model 2’s talent
amplifier output. Each Model 32 and Model
33 Talent Amplifier has both a female and a
male 3-pin XLR-type connector. This allows
the talent amplifier interconnecting cables
to be “looped” through the talent amplifiers.
This will simplify and, in most cases, reduce
the amount of cabling required to connect
multiple talent amplifiers.
Line Outputs
Associated with each of the two IFB
channels is an electronically balanced line-
level output with a nominal signal level of
+4 dBu. The line outputs are capable of
driving balanced or unbalanced, low or high
impedance loads. The line outputs exit the
Model 2 via two 3-pin male XLR-type con-
nectors. Prepare the mating connectors
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 pins 1 and 3 to
shield.
Some installations may use the line outputs
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 recom-
mended that the line outputs be wired via
audio patch points, even if you have a dedi-
cated application.
The Model 2’s audio quality and flexibility
make it a useful tool for non-IFB applica-
tions. Not to “toot our own horn,” but the