Studio Technologies 81 - Manual (Page 7)

Model 81 User Guide Issue 1, January 2000
Studio Technologies, Inc. Page 7
Introduction
The Model 81 Stereo Analog Audio
Distribution Amplifier was developed by
Studio Technologies as part of its Studio
Tools group of audio support products.
The Model 81 is designed to work in a
large variety of applications. Specific
applications include audio production,
duplication, broadcast, and sound rein-
forcement. All Model 81 functions meet or
exceed the performance of the most
expensive “high end” audio equipment.
What This User Guide Covers
This User Guide is designed to assist you
when installing, configuring, and using the
Model 81 Stereo Analog Audio Distribution
Amplifier.
System Overview
The Model 81 from Studio Technologies,
Inc. is a distribution amplifier that truly
meets the needs of the real world. The
stereo input is intended to connect to
virtually any line-level audio source.
The ExactCal input calibration section
allows optimal audio performance to be
achieved over a nominal input level range
of –12dBV to +6dBu. The eight stereo
outputs meet exacting professional stan-
dards. Capable of driving balanced or
unbalanced loads, each output can drive
+26dBu into 600 ohms. Using front panel
switches, each stereo output can be
individually configured for a nominal
output level of –10dBV or +4dBu.
The front-panel trim potentiometers and
LEDs make calibration and use simple.
The AC mains input power is factory
configured for 100, 120 or 220/240V,
50/60Hz operation. Components and
construction standards make the Model
81 suitable for continuous operation, even
for on-air broadcast applications.
System Features
One Stereo Input
The differential input circuitry is compat-
ible with balanced or unbalanced signals
having a nominal level range of –12dBV
to +6dBu. Using laser-trimmed compo-
nents, the stereo input offers superior
common-mode signal rejection. To
achieve optimal audio performance the
ExactCal calibration section matches the
installation-specific nominal input level
with the Model 81’s internal gain structure.
Two 15-turn trim potentiometers and four
LEDs allow fast, precise calibration. Unlike
other distribution amplifiers, the Model 81
ensures that excellent audio performance
can be achieved with little or no hassle.
Eight Stereo Outputs
The Model 81 contains eight independent
stereo output sections. For compatibility
with a range of facilities, each output
section can be separately configured for
a –10dBV or +4dBu nominal output level.
Each output features an electronically
balanced circuit capable of driving bal-
anced or unbalanced loads. And, unlike
some output circuits, operating a Model
81 output in an unbalanced configuration
does not cause a change in the nominal
output level. Short circuit resistant, the
rugged output circuits can drive full signal
levels into 600 ohm or greater loads.
The Model 81’s architecture precludes
the need for individual output-level trim
potentiometers. With the input signal
calibrated using the ExactCal section,