Studio Technologies M233-01151 - Manual (Page 6)

Issue 5, November 2014 Model 233 User Guide
Page 6 Studio Technologies, Inc.
of capabilities many other specialized
“behind-the-scenes” applications 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. An LED indicator serves as
an aid for optimizing the preamplifier’s gain
setting. The output of the microphone pre-
amplifier is used by the main output as well
as being routed to the compressor circuit
that supports the talkback functions.
Main Output
The Model 233 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-perfor-
mance output transformer expressly de-
signed for 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 233 contains
two pushbutton switches that control the
talkback functions. Associated with each
pushbutton switch is a dedicated line-level
talkback output. Each pushbutton switch
can also be configured to send audio
to one specific channel associated with
the Model 233’s dual-channel intercom
interface.
The line-level talkback outputs are trans-
former-coupled with a +4 dBu nominal
signal level. They contain resistors in series
with the output connectors, allowing line-
level talkback outputs from multiple units
to be directly “summed.”
For non-on-air applications, a special
Model 233 feature set can be enabled by
placing the unit in its “production” mode.
This software-based mode allows the main
output to be used as an additional talkback
Figure 2. Model 233 back panel