Studio Technologies 742 2005 - Manual (Page 6)

Issue 2, May 2005 Model 742 User Guide
Page 6 Studio Technologies, Inc.
Model 742
there’s flexibility on the inside, the opera-
tor is presented with an easy-to-use set of
front-panel controls and indicators—the
operator never has to access the back
panel to operate the unit. In this way the
goal of delivering successful on-air and
production audio, day-after-day, can best
be achieved. The Model 742’s audio qual-
ity is “pro” throughout. The components
were carefully selected to deliver low-noise,
low-distortion performance.
Long-term reliability was also part of the
Model 742’s design criteria. To that end
the unit’s enclosure is made of steel, com-
bining strength with effective RF rejection.
On the inside, all components are mounted
on an FR4 (fiberglass-based) circuit board
assembly.
System Features
Mic/Line Inputs
Four input channels are provided for con-
nection to microphone or line-level signals.
The electronically balanced circuitry is
“ruggedized” for reliable operation under
tough operating conditions. The low-noise,
low-distortion, high-headroom audio per-
formance is what’s expected of sophis-
ticated “pro audio” equipment. Features
provided for each input channel include
an input sensitivity button, rotary level
control, level status LED, and output bus
assignment switch. To support condenser
microphones, the four mic/line inputs can
be internally configured to provide 12-volt
phantom power.
For ease of use, the rotary level control
sets the gain of the input circuit as well as
the level being sent to the selected main
output bus (or buses). For convenience
the input sensitivity button, like all of the
Model 742’s operator controls, is located on
the front panel. For operator assistance, a
dual-color level status LED provides signal
present and peak level indication. Associ-
ated with each mic/line input channel is a
3-position output bus assignment switch.
This allows each input to be assigned to
bus 1, bus 2, or both, quickly creating two
fully independent audio “feeds.”
Bus assignment switches, rather than the
more-typical “pan pots,” were specifically
selected for the Model 742’s design. This
allows a more positive assignment of an
input source to the desired output bus (or
buses), minimizing the chance of unwanted
“leakage.” Pan pots are fine in an audio
mixer destined for use in stereo music situ-
ations, but are inferior when used for two-
bus applications.
Line Inputs
Four input channels are provided for con-
nection to line-level signals. Features pro-
vided for each line input channel include a
rotary level control, level status LED, and
output bus assignment switch. The rotary
level control is used to set the amount of
input signal that is sent to the selected main
output bus (or buses). The dual-color level
status LED provides signal present and
peak level indication. A 3-position switch
allows the input signal to be assigned to
the desired output bus (or buses).
Main Output Buses
Signals from the eight input channels
(four mic/line and four line) are routed and
combined to create the two main output
buses. A dual rotary control is used to
set the overall level of the two buses. An
electronically balanced output circuit is