Studio Technologies 230 2008 - Manual (Page 6)

Issue 7, October 2008 Model 230 User Guide
Page 6 Studio Technologies, Inc.
interpretation. In addition, with the unit’s
broad range of capabilities many other
specialized “behind-the-scenes” applica-
tions can also be implemented.
System Features
Microphone Input
A high-performance microphone pre-
amplifier circuit provides low-noise/low-
distortion amplification over a 20 to 60
dB gain range. The gain is adjustable in
10 dB steps. The input is compatible with
balanced dynamic and condenser micro-
phones. The microphone power source
is 48 volts nominal and meets the world-
wide P48 phantom power standard. An
LED indicator serves as an aid for optimiz-
ing the preamplifier’s gain setting. The out-
put of the microphone preamplifier is used
by the main output as well as being routed
to the compressor circuit that supports the
talkback functions.
Main Output
The Model 230 provides a main output that
is designed to serve as the on-air, stadium
announcement, or other primary audio
feed. Nominally –2 dBu, it is designed as
a fully professional interface with high
output capability, low distortion, and low
noise. The output circuitry features a
high-performance output transformer
expressly designed for professional
audio applications.
Talkback Functions
The talkback functions are intended
to provide personnel associated with
production trucks, control rooms, live-
performance, and sports venues with
talent-originated cue signals. The Model
230 contains two pushbutton switches that
control the talkback functions. Each but-
ton can be configured to allow talkback
audio to be routed to one of three loca-
tions: intercom channel 1, intercom chan-
nel 2, or a line-level talkback output. The
line-level talk-back output is transformer-
coupled with a +4 dBu nominal signal
level. It contains resistors in series with
the output connector, allowing line-level
talkback outputs from multiple units to be
directly “summed.”
For non-on-air applications, special Model
230 features can be enabled by placing
the unit in one of two “production” modes.
These software-based modes allow the
main output to be used either as a “hot
Figure 2. Model 230 back panel