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Studio Technologies Model 381 On-Air Beltpack

Model: M381

Studio Technologies Model 381 On-Air Beltpack
Studio Technologies Model 381 On-Air Beltpack
Studio Technologies Model 381 On-Air Beltpack
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About: Studio Technologies Model 381 On-Air Beltpack

The Model 381 On-Air Beltpack offers a unique combination of audio resources to directly support a complete broadcast "stand-up" on-air position. Using Dante® audio-over-Ethernet technology, the unit provides main and talkback output channels, talent cue (IFB) input, and sidetone capabilities, as well as essential user controls in a compact, portable package. The Model 381 is compatible with the Dante Domain Manager™ (DDM) software application and is AES67-compliant for direct integration into many contemporary networked audio applications.

Key Features

  • Dante audio-over-Ethernet technology
  • Creates complete "stand-up" on-air position
  • One main and one talkback output channel
  • Highly-flexible 2-channel headphone output
  • Integrated sidetone function
  • Excellent audio quality
  • Uses STcontroller for configuration
  • Power-over-Ethernet (PoE) powered


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

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

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

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) is a Canadian authorized Studio Technologies retailer.

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