Datasheet

Studio Technologies, Inc. Model 381 On-Air Beltpack, Issue 1, Page 3
in which they are assigned to the headphone output channels
can be configured. In addition, the operation of the two rotary
controls can be selected. These unique choices allow almost any
required headphone monitoring situation to be implemented.
Whether for use in on-air sports, in an eSports broadcast, or
as a production support tool, the Model 381 should be able to
achieve the desired configuration.
The integrated sidetone function can be configured to oper
-
ate from among three choices. This allows audio associated
with the microphone input and microphone preamplifier to be
returned to the headphone output as required. Sidetone can
be important as some applications may provide a “mix-minus”
talent cue signal that doesn’t include the user’s own voice
content. A configuration selection allows the talkback button to
be selected for a momentary or latching operation. The Dante
main output channel can be selected to its audio source to be
“pre-” or “post-” the dynamics control circuitry.
Future Capabilities and Firmware
Updating
The Model 381 was designed so that its capabilities and per-
formance can be enhanced in the future. A USB connector,
located on the unit’s main circuit board (underneath the unit’s
cover), allows the application firmware (embedded software)
to be updated using a USB flash drive.
The Model 381 uses Audinate’s Ultimo™ integrated circuit to
implement the Dante interface. The firmware in this integrated
circuit can be updated via the Ethernet connection, helping to
ensure that its capabilities remain up to date.
Model 381 Specifications
Power Source:
Power-over-Ethernet (PoE): class 2 (low power, ≤6.49 watts)
Network Audio Technology:
Type: Dante audio-over-Ethernet
AES67-2013 Support: yes
Dante Domain Manager (DDM) Support: yes
Bit Depth: up to 24
Sample Rate: 44.1,48, 88.2, and 96 kHz
Number of Transmitter (Output) Channels: 2
Description of Transmitter Channels: main (pre- or post-
compressor, selectable), talkback (post-compressor)
Number of Receiver (Input) Channels: 2
Description of Receiver Channels: headphone channel 1 and
headphone channel 2
Dante Audio Flows: 4; 2 transmitter, 2 receiver
Network Interface:
Type: 100BASE-TX, twisted-pair Ethernet, Power-over-
Ethernet (PoE) supported
Data Rate: 100 Mb/s (10 Mb/s and 10000 Mb/s “GigE”
Ethernet not supported)
Microphone Input:
Compatibility: dynamic or phantom-powered microphones
Type: balanced, capacitive coupled
Impedance: 2.8 k ohms, nominal
Gain: 36, 42, 48, 54, and 60 dB, selectable
Frequency Response: 30 Hz to 20 kHz, –3 dB at 30 Hz,
–0.6 dB at 20 kHz
Distortion (THD+N): <0.020%, 1 kHz, 36 dB gain, –32 dBu
input level
Dynamic Range: 96 dB, A-weighted
Phantom Power: P48 per IEC 61938 standard, on/off
selectable with status LED
Compressor:
Application: always used for Dante talkback audio output
channel, can be used for Dante main output channel
Threshold: 1 dB above nominal level (–19 dBFS)
Slope: 2:1
Status LED: compressor active
Headphone Output:
Type: 2-channel
Compatibility: intended for connection to stereo (dual-
channel) or mono (single-channel) headphones, headsets
or earpieces with nominal impedance of 50 ohms or greater
Maximum Output Voltage: 3.1 Vrms, 1 kHz, 150-ohm load
Frequency Response: 20 Hz to 20 kHz, +0/–1 dB
Distortion (THD+N): 0.001%, +10 dBu output, 150 ohm
load
Dynamic Range: >102 dB
Connectors:
Microphone Input: 3-pin female XLR
Headphone Output: ¼-inch 3-conductor jack
Ethernet: Neutrik etherCON RJ45
USB: type A receptacle (located inside Model 381’s
enclosure and used only for updating firmware)
Configuration: uses Studio Technologies’ STcontroller
personal computer application, version 1.08.00 and later
Environmental:
Operating Temperature: 0 to 50 degrees C (32 to 122
degrees F)
Storage Temperature: –40 to 70 degrees C (–40 to 158
degrees F)
Humidity: 0 to 95%, non-condensing
Altitude: not characterized
Dimensions (Overall):
3.1 inches wide (7.9 cm)
1.5 inches high (4.0 cm) w/out belt clip; 1.8 inches (4.6 cm)
with belt clip
4.9 inches deep (12.5 cm)
Deployment: intended for portable applications; contains
integral belt clip
Weight:
0.5 pounds (0.23 kg)
Specifications subject to change without notice.
Studio Technologies, Inc.
Skokie, Illinois USA
© by Studio Technolog
ies, Inc., January 2019
studio-tech.com