Studio Technologies 372A, User Manual

Page: 9 / 23

Model 372A User Guide Issue 1, April 2019
Studio Technologies, Inc. Page 9
MODEL 372A
INTERCOM BELTPACK
dual-ear intercom- or broadcast-style head-
set. The connector is labeled Headset A.
Refer to Figure 2 for connection details. The
microphone input connections are compat-
ible with most unbalanced dynamic or elec-
tret (low-voltage DC-powered) microphones.
A balanced dynamic microphone should,
in most cases, also function correctly if its
signal – (low) is connected to Model 372A’s
mic in –/shield connection. No support is
provided for microphones that require P12
or P48 phantom power.
To allow users of stereo (dual-earpiece or
“double muff”) headsets to hear a monau-
ral 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 head-
phone channel to pin 5. Configuration choic-
es, discussed later in this guide, can then be
used to create the desired monaural output.
It’s important not to connect together (short)
pins 4 and 5 of the headset’s connector as
damage to the Model 372A’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 head-
set interconnecting cable assemblies termi-
nate the earpiece’s left and right connections
opposite from what the Model 372A 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 earpiece 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 earpiece connects to pin 4 and
the right earpiece to pin 5.
If a separate microphone and pair of head-
phones need to connected an adapter cable
assembly should be fabricated. It would
consist of a 5-pin male XLR connector wired
to both a 3-pin female XLR connector for
the microphone and a ¼-inch or 3.5 mm
TRS jack for the headphones. In this scenar-
io the microphone would in most cases
be a dynamic type as the Model 372A pro-
vides only low-voltage DC “electret” power.
Phantom-powered (P12 or P48) micro-
phones would not be compatible. Most
hand-held or “stick” microphones are dy-
namic and should function correctly.
Headset B
The Model 372A also allows direct connec-
tion of gaming headsets that are ubiquitous
in the personal computer world. The 3.5 mm
4-conductor TRRS jack, labeled Headset B,
is compatible with the CTIA™/AHJ configu-
ration standard which has the headphone
left channel on the tip connection, the head-
phone right channel on the ring 1 connec-
tion, common on the ring 2 connection, and
the microphone on the sleeve connection.
Compatible headsets are readily available,
typically described as personal computer or
gaming headsets. The microphones used
in these headsets are electret type which
require a low-voltage DC source for opera-
tion. The Model 372A is able to provide this
Figure 2. Headset A connection pinout chart