Studio Technologies 216 - Manual (Page 24)

Issue 1, July 2014 Model 216 User Guide
Page 24 Studio Technologies, Inc.
One of the headphone modes uses the
control in the center of the unit as a bal-
ance function. In this case the detent
position will send approximately equal
levels to both the left and right headphone
output channels. This is as one would
expect from a “stereo” balance control
such as provided in consumer electronic
equipment.
When the headphone minimum level con-
figuration is set to –40 dB, turning a level
control to its fully counterclockwise posi-
tion will cause the level of its associated
headphone output channel(s) to 40 dB
below maximum. This ensures that users
will never be fully “isolated” from poten-
tially important cue signals. In addition,
when a control is set to provide a balance
function, turning it to either its fully clock-
wise or fully counterclockwise position will
cause the level on the applicable head-
phone output channel to be 40 dB below
its maximum.
If the headphone minimum level configu-
ration is set for full mute, turning a level
control to its fully counterclockwise posi-
tion will cause the level of the associated
channel(s) to fully mute. In addition, when
a control is configured to provide a bal-
ance function, rotating it to either its fully
clockwise or fully counterclockwise posi-
tion will cause the level of the applicable
channel to fully mute.
USB Interface
A USB type A connector and associated
status LED is located on the back panel of
the Model 216. This data interface is used
only for updating the unit’s operating firm-
ware (embedded software). No audio data
of any kind will pass through it. For details
please refer to the Technical Notes section
of this guide.
Technical Notes
Phantom Power
The Model 216 provides a 48 volt nominal
source of phantom power to support con-
denser-type microphones. It’s designed
to meet the P48 requirements as specified
in the IEC 61938 standard. The circuitry
is very simple, consisting of 6.85 k ohm
resistors that provide a path from a 45 volt
source to pins 2 and 3 of the microphone
input connector. The resistors and the
power source work together to provide the
required 48 ±4 volts, up to a maximum
current of 10 milliamperes.
Travel Case
For portable applications it may be desir-
able to store and transport each Model
216 in a protective case. After much travel
with prototype announcer’s console units,
Studio Technologies’ personnel learned to
appreciate the Pelican Model 1450 case.
Purchased with the foam interior option,
it does an excellent job of holding one
Model 216, an external 12 volt DC power
supply, and documentation. Some ap-
plications may benefit from selecting a
larger case that would also hold a related
headset, cables, etc. A larger case could
also be selected that would hold multiple
Model 216 units. Pelican sells their prod-
ucts through a dealer network, many of
which can be located via a web search.
Additional Connectors
Locations
Two spare connector locations are provid-
ed on the Model 216’s back panel. They
are labeled A and B. From the factory they
contain blank plates that can be readily
removed and replaced with a variety
of “XLR style” connectors. The spare