Studio Technologies 220 2013 - Manual (Page 11)

Model 220 User Guide Issue 5, February 2013
Studio Technologies, Inc. Page 11
Installation and
Setup
In this section interconnections will be
made using the input and output con-
nectors located on the Model 220’s back
panel. Microphone input, IFB input, line
input, main output, and talkback output
signals are interfaced by way of 3-pin XLR
connectors. A ¼-inch 3-conductor phone
jack is provided for the headphone output.
A 2.1 x 5.5 mm coaxial jack allows con-
nection of an external 24 volt DC power
source.
System Components
Included in the shipping carton are the fol-
lowing: Model 220 Announcer’s Console,
user guide, button label sheet, and 24 volt
DC power supply.
Microphone Input
The Model 220 is compatible with bal-
anced dynamic and condenser micro-
phones. Depending on the application,
the microphone may be part of a headset,
or be an independent handheld or stand-
mounted model. The Model 220’s 48 volt
nominal power source will support essen-
tially all phantom-powered microphones.
The quality of the Model 220’s microphone
preamplifier and associated circuitry is
such that special applications may benefit
from using “high-end” microphones. If
selected appropriately, models from man-
ufacturers such as AKG, Beyer, Neumann,
Sennheiser, and Shure will perform very
well in Model 220 applications.
The microphone input is also compatible
with line-level audio sources. This allows
the output of an external microphone pre-
amplifier, microphone processor, or audio
console to be directly connected. When
the configuration DIP switches are set for
0 dB (no gain) the nominal level of the
source audio signal should be approxi-
mately –2 dBu.
Microphone interconnection is made
by way of a 3-pin female XLR connec-
tor which is located on the Model 220’s
back panel. The mating connector (male)
should be wired so that pin 2 is signal
high (+ or hot), pin 3 is signal low (– or
cold), and pin 1 is shield. It’s possible that
an unbalanced microphone will also work
correctly. In this case, the mating connec-
tor (male) should be wired so that pin 2
is signal high (+ or hot), and signal
common/shield is connected to both
pins 1 and 3.
The Model 220 is not compatible with
unbalanced “electret”-type microphones
that require a source of low-voltage DC
for operation. These microphones, some-
times found in low-cost headsets, are not
generally suitable for on-air or other de-
manding applications.
As of the writing date of this user guide,
the Sennheiser HMD 26 headset is very
popular for on-air sports broadcasting
use. A fine product, it works very well with
the Model 220. Note that adding the suffix
“-XQ” to the headset’s full part number
(HMD 26-600-XQ) specifies a 3-pin male
XLR connector for the dynamic micro-
phone and a ¼-inch 3-conductor plug for
the stereo headphones. This configura-
tion is very useful, allowing the headset
to work directly “out of the box” with the
Model 220.
If the writer may digress for a moment
to recount a story… an audio dealer
once shared a secret with me concerning
headsets. He loved selling the “lower-end”
(less expensive) models of name-brand