Manual

Model 348 User Guide Issue 1, January 2020
Studio Technologies, Inc. Page 9
MODEL 348
INTERCOM STATION
As previously discussed in this guide, an
Ethernet connection that provides power-
over-Ethernet (PoE) can serve as the Model
348’s power source. Alternately, an exter-
nal 12 volts DC source can be connected.
For redundancy, both PoE and the external
source can be connected at the same time. If
both PoE and an external 12 volts DC source
are connected, power will be drawn only from
the PoE supply. If the PoE source becomes
inoperative the 12 volts DC source will pro-
vide the Model 348’s power. No interruption
in operation will occur during a power source
transition.
Headset Connections
The Model 348 allows two different types of
headsets to be connected. A
5-pin female
XLR connector, located on the Model 348’s
back panel, allows connection of a standard
broadcast- or intercom-style communica-
tions headset. A 3.5 mm 4-conductor
TRRS
jack, also located on the back panel, allows a
computer gaming headset to be directly con-
nected. The Model 348’s two headset connec-
tors are electrically wired in parallel. As such,
only one type of headset should be connected
at one time.
Headset A
The Model 348 provides a 5-pin female XLR
connector that interfaces with the microphone
and headphone connections of a single- or
dual-ear intercom or broadcast-style headset.
The connector is labeled Headset A. Refer
to Figure 2 for connection details. The mi-
crophone input connections are compatible
with most unbalanced dynamic or electret
(low-voltage DC-powered) microphones. A
balanced dynamic microphone should, in
most cases, also function correctly if its signal
– (low) is connected to Model 348’s mic in –/
shield connection. No support is provided for
microphones that require P12 or P48 phan-
tom power.
To allow users of stereo (dual-earpiece or
“double-muff”) headsets to hear a monaural
version of the two headphone output channels
does not require special wiring of the 5-pin
male XLR mating connector. The headset’
s left
headphone channel should always be wired
to pin 4 and the right headphone channel to
pin 5. Software-based configuration choices,
discussed later in this guide, can be used to
create the desired monaural output. It’s impor-
tant not to connect together (short) pins 4 and
5 of the headset’s connector as damage to the
Model 348’s output circuitry could result.
A monaural (single-earpiece or “single-muff”)
headset should be wired such that its head-
phone is wired only to pin 4; pin 5 should
be remain unused. Configuration choices,
discussed later in this guide, can be used
to create a monaural output.
It’s possible that some Beyerdynamic headset
interconnecting cable assemblies terminate
the earpiece’s left and right connections op-
posite from what the Model 348 and other
broadcast equipment require. These cables
may terminate the left earpiece to pin 5 of the
5-pin male XLR connector and the right ear-
piece to pin 4. If this condition is present it will
require reversing or “flipping” the two wires in
a headset’s connector such that the left ear-
piece connects to pin 4 and the right earpiece
to pin 5.
Figure 2. Headset A connection pinout chart