Studio Technologies 230 2014 - Manual (Page 6)

Issue 9, November 2014 Model 230 User Guide
Page 6 Studio Technologies, Inc.
broad range of capabilities many other
specialized “behind-the-scenes” applica-
tions can also be implemented.
System Features
Microphone Input
A high-performance microphone preampli-
fier 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 microphones. The micro-
phone power source is 48 volts nominal
and meets the worldwide P48 phantom
power standard. The preamplifier’s gain
can also be set for 0 dB, allowing a line-
level audio signal to be connected. This
could provide useful in special applications
such as when an external preamp or mic
processor is being used.
An LED indicator serves as an aid for opti-
mizing the preamplifier’s gain setting. The
output of the microphone preamplifier is
used by the main output as well as being
routed to the compressor circuit that sup-
ports 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 use in professional audio
applications.
Talkback Functions
The talkback functions are intended to pro-
vide 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 talk-
back functions. Each button can be config-
ured to allow talkback audio to be routed
to one of three locations: intercom channel
1, intercom channel 2, or a line-level talk-
back output. The line-level talkback out-
put 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.”
Figure 2. Model 230 back panel