Studio Technologies 220 2004 - Manual (Page 5)

Issue 2, August 2004 Model 220 User Guide
Page 6 Studio Technologies, Inc.
System Features
Microphone Input
A high-performance microphone
preamplifier 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 microphone power
source is 48 volts nominal and meets the
worldwide P48 phantom standard. An LED
indicator serves as an aid for optimizing
the setting of the preamplifier’s gain. 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 220 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 de-
signed as a fully professional interface
with high output capability, low distortion,
and low noise. It features a high-quality
transformer expressly designed for driving
long broadcast cable runs.
For specialized applications an optional
direct microphone output card is available.
This allows an external microphone pre-
amplifier to be used. Of course this output
also provides “click-free” microphone
on/off (“muting”) control.
Talkback Outputs
The two talkback outputs are intended
to provide production trucks, control
rooms, or support personnel with talent-
originated cue signals. These outputs are
transformer-coupled with +4 dBu nominal
signal levels. They contain resistors in
series with their output connector, allowing
the talkback outputs from multiple units
to be directly “summed.”
For non-on-air applications, a special
Model 220 feature can be enabled, plac-
ing the unit in a “production” mode. This
allows the main output to be used as a
third talkback output. In this configuration
the unit can be even more powerful when
used in corporate or theatrical events, for
example serving as a master console for
a production director.
Dynamic Range Control
A studio-quality compressor circuit is pro-
vided to control the dynamic range
Figure 2. Model 220 back panel