Studio Technologies 210 2008 - Manual (Page 8)

Issue 4, October 2008 Model 210 User Guide
Page 8 Studio Technologies, Inc.
while the other allows adjustment of the
left/right level balance. To help minimize
the chance of broadcast cues being
missed, both level control modes can be
configured so that a minimum headphone
output level is maintained. Alternately, the
headphone output can be set to fully mute
when the controls are at their minimum
position.
Provision has been made to support ap-
plications where a monaural cue feed is
desired. A configuration switch allows the
summing (combining) of the selected left
and right headphone sources. In addition
to creating a dual-channel mono output it
also allows the level controls to be config-
ured as a simple 2-channel mixer.
The headphone output was designed
to meet the needs of contemporary head-
phones and headsets. Specifically, the
output circuits act as voltage, rather than
power, drivers. In this configuration they
can provide high output levels with very
low distortion and noise, along with mini-
mal current consumption. The output cir-
cuits are configured to safely drive stereo
or mono loads. This ensures that all types
of headphones, headsets, and earpieces
can be directly connected.
Audio Quality and Protection
The Model 210’s circuitry is carefully
tailored to provide excellent audio perfor-
mance. Professional-quality components
are featured throughout. For reliability
all audio routing is performed using solid-
state devices. In all critical audio paths,
“clickless” electronic switches provide
noise-free control. All audio inputs and
outputs make extensive use of protection
components. This limits the chance of
damage from ESD and other undesirable,
yet real-world, hazards.
Power Sources
The Model 210 can derive its operat-
ing power from either the IFB input or an
external nominal 24 volt DC source. For
redundancy, both power sources can be
connected simultaneously. An internal
switch-mode power supply ensures that
all Model 210 features are available when
the unit is powered by either source.
The Model 210 is compatible with IFB
circuits provided by most standard broad-
cast systems. However, maximum perfor-
mance can often be obtained by using the
IFB interface devices available from Studio
Technologies. Single-channel and four-
channel units are available, each providing
high-quality audio along with an excellent
source of DC power. They’re directly com-
patible with most matrix intercom systems,
as well as standard line-level audio signals.
Refer to the Studio Technologies website
for details.
Configuration
Model 210 configurations are made us-
ing a number of DIP-type switches. One
8-position switch array is used to set the
gain of the microphone preamplifier, the
on/off status of phantom power, and the
headphone stereo/mono mode. Another
8-position switch array configures which
of the IFB audio sources is routed to the
headphone output. A third 8-position switch
array communicates the desired operating
modes to the microprocessor. All switches
are accessible via the bottom of the Model
210’s enclosure; the unit does not have to
be disassembled. Changes made to any
of the configuration parameters become
active immediately. To prevent access to
the configuration switches a security panel,
included with each unit, is attached to the
bottom of the enclosure.