Studio Technologies 2A 2013 - Manual (Page 26)

Issue 1, October 2013 Model 2A User Guide
Page 26 Studio Technologies, Inc.
approximately one second after which
normal operation will commence. At this
stage the power LED on the Model 2A and
any connected Model 32A and/or Model
33A Talent Amplifiers should be lit. If one
or more Model 22 or Model 24 Access
Stations have been connected, their push-
button switches should be dimly lit.
It’s Time to Use the System!
Operation can commence after the Model
2A and related equipment have been
installed and interconnected. Any changes
required to the Model 2A’s internal con-
figuration should have been made, fol-
lowing the information provided in the
Configuration section of this guide. Mains
power should be applied and the power
LED should be lit. Note that the Model 2A’s
power LED also provides an indication of
a second condition. If the talent amplifier
output goes into its fault mode (typically
due to excessive current being drawn) the
power LED will flash on-and-off until the
condition has been corrected.
In the following paragraphs we’ll describe
several scenarios you can use to try out
some of the Model 2A’s features.
Program Inputs, Meters, and Monitor
Output
Connect a high-quality audio source, e.g.,
personal audio device or off-air receiver, to
one of the program inputs. Select this input
as the program audio source for one of the
IFB channels. Set the program level control
of that IFB channel such that the yellow
LED lights on signal peaks. Test the moni-
tor output by selecting the appropriate IFB
channel and setting the rotary level control.
You should hear the problem source and it
should let you “rock out” pretty well. If not,
put in a maintenance request for a better
speaker!
Internal Interrupt Microphone
Press the IFB buttons on the left side of
the Model 2A’s front panel to activate the
internal microphone. To prevent possible
acoustical feedback the monitor output
will mute. Using the meters, observe that
pressing one of these buttons will cause
the program audio source to mute, re-
placed with signal coming from the internal
microphone. The level of the local interrupt
audio signal is controlled using the com-
pressor circuits. No user level controls are
provided.
Talent Amplifiers
Connect an earpiece to an associated
talent amplifier. (The Models 32A and 33A
Talent Amplifiers provide their audio output
signals on a ¼-inch 2-conductor phone
jack and a 3.5 mm output jack.) Carefully
adjust the level control, starting at the fully
counterclockwise position. You should be
able to hear the program audio and, when
a front-panel IFB button is pressed, inter-
rupt audio.
On the Model 32A, a switch allows either
IFB channel to be selected as the audio
source. On the Model 33A, either or both
IFB channels can be selected as the audio
source(s). The level control(s) should be
adjusted for the desired level during an
interrupt from the Model 2A’s internal mi-
crophone. Then the program level should
appear at the correct level. (If not, adjust
the relevant program level control on the
Model 2A.) Note that the even when the
headphone level control on the Model
32A or 33A is set to its fully counterclock-
wise position, the audio output will not
be fully “off.” This ensures personnel will