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The microphone input can be selected for compatibility with dynamic or electret (DC-powered) microphones. The gain of the microphone preamplifier can be selected from among four choices. These allow compatibility with a variety of microphones that are part of broadcast and intercom headsets.

Microphone Input: Compatibility: dynamic or electret (low-voltage DC-powered) microphones Type: unbalanced Electret Microphone Power: 3.3 volts DC via 2.00 k resistor, selectable on/off Gain: 22, 30, 42, or 48 dB, selectable Frequency Response: 50 Hz to 10 kHz, –3 dB Distortion (THD+N): <0.02%, 1 kHz, 22 dB gain Noise Floor: –95 dBFS (A-weighted)

The Model 374A's completely "pro" performance is counter to the less-than-stellar reputation of typical party-line (PL) intercom audio. A low-noise, wide dynamic-range microphone preamplifier and associated voltage-controlled-amplifier (VCA) dynamics controller (compressor) ensures that microphone audio quality is preserved while minimizing the chance of signal overload. DC power to support electret microphones can be enabled if necessary. The output of the microphone preamp and compressor is routed to an analog-to-digital converter (ADC) section that supports a sampling rate of 48 kHz with a bit depth of up to 24. The audio signal, now in the digital domain, travels through the processor and on to the Dante interface section where it is packetized and prepared for transport over Ethernet.

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Which Dante Intercom Beltpack is right for your application? Review the Model 370-Series Feature-by-Feature Comparison Charts.

The audio quality of the Model 374A's four audio channels is excellent, with low distortion, low noise, and high headroom. Careful circuit design and rugged components ensure long, reliable operation. A wide range of applications can be supported, including sports and entertainment TV and radio events, streaming broadcasts, corporate and government AV installations, and post-production facilities.

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The Model 374A Intercom Beltpack begins with the features offered by traditional party-line intercom user devices and adds a range of new capabilities along with the advanced performance and flexibility that Dante® audio-over-Ethernet provides. With four independent talk and listen channels the Model 374A bridges the gap between typical single- and dual-channel party-line devices and permanently installed multi-channel intercom panels. Imagine the possibilities—four channels of high-quality party-line intercom in a compact, user-worn package.

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Call Function: Receive Support: channels 1-4 Send Support: channels 1-3 Signaling Method: 20 kHz, ±800 Hz, within audio channels Receive Level: –27 dBFS minimum Send Level: –20 dBFS

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A call function allows Model 374A users to receive and send channel-specific visual alert signals. Using 20 kHz tones, the call signals are sent within the audio channels ("in band") allowing interoperability between multiple Model 374A units as well as being compatible with legacy party-line intercom systems. Call signals can be useful to indicate to users that they are needed "on headset" or should be actively listening to an intercom channel. The call function can also be used to provide realtime cues to production personnel during the running of live events. Call signals present on the four audio input (Dante receiver) channels can be detected and displayed. Pushbutton 4, on the Model 374A's top panel, can be configured to serve as a call button. This allows a call signal to be generated for talk channels 1, 2, and 3.

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Network Interface: Type: 100BASE-TX, twisted-pair Ethernet, Power-over-Ethernet (PoE) supported Data Rate: 100 Mb/s (10 Mb/s and 1000 Mb/s GigE Ethernet not supported)

Connectors: Headset: 5-pin female XLR Remote Control Inputs: 3-conductor (TRS) 3.5 mm jack Ethernet: Neutrik NE8FBH etherCON RJ45 receptacle USB: type A receptacle (located inside Model 374A’s enclosure and used only for application firmware updates)

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Network Audio Technology: Type: Dante audio-over-Ethernet AES67-2018 Support: yes Dante Domain Manager (DDM) Support: yes Bit Depth: up to 24 Sample Rate: 48 kHz Number of Transmitter (Output) Channels: 4 Number of Receiver (Input) Channels: 4 Dante Audio Flows: 4; 2 transmitter, 2 receiver

Only a single Power-over-Ethernet (PoE) connection is required for operation. Key user features can be easily configured using the STcontroller software application. Configurable parameters include electret microphone powering, microphone preamplifier gain, talk button operation, and headphone channel assignment. User features include integrated sidetone, remote mic kill ("talk off"), call function, and monitor-only modes. The wide range of capabilities, along with the excellent audio quality provided by the digital audio signal path, offers a unique and powerful user experience.

The Model 374A's operating power is provided by way of the Ethernet interface using the 802.3af Power-over-Ethernet (PoE) standard. This allows fast and efficient interconnection with the associated data network. To support PoE power management, the Model 374A's PoE interface reports to the power sourcing equipment (PSE) that it's a class 1 (very low power) device.

Dante audio-over-Ethernet technology Four independent talk and listen channels Supports dynamic and electret microphones 5-pin female XLR headset connector Configurable operating modes using STcontroller Two remote control inputs Excellent audio quality AES67 and Dante Domain Manager™ support Power-over-Ethernet (PoE) powered Which Dante Intercom Beltpack is right for your application? Review the Model 370-Series Feature-by-Feature Comparison Charts.

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Remote Control Inputs: 2 Function: configurable, can mimic the action of any talk button function Type: active low, 1 mA maximum, input pulled up to 3.3 volts DC via 3.4 k ohm resistors

A unique Model 374A feature is the ability to individually configure the way in which the four talk pushbutton switches function; four choices are available. For standard intercom beltpack operation either Push to Talk or Push to Talk/Tap to Latch operation can be selected. For situations where only monitoring of an intercom channel is desired a Talk Disabled mode is available. And for advanced monitoring-only situations the Talk Disabled/Phones Tap to Latch mode can be selected such that a button will serve in an audio on/off role.

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Audio data is sent to and received from the Model 374A using the Dante audio-over-Ethernet media networking technology. As a Dante-compliant device, the Model 374A's four audio output (Dante transmitter) and four audio input (Dante receiver) channels can be interconnected (routed) with other devices using the Dante Controller software application. The Dante transmitter and receiver channels are limited to supporting four Dante flows, two in each direction. The digital audio's bit depth is up to 24 with a sampling rate of 48 kHz. The Model 374A is AES67 compatible and compliant with the Dante Domain Manager™ software application.

Over a standard IP network, multiple Model 374A units can be used in party-line (PL) intercom applications with help from an external Dante-enabled audio matrix such as the Studio Technologies Model 5422 Dante Intercom Audio Engine. Or, units can be used "point-to-point" or interfaced with Dante-compatible matrix intercom systems.

The Model 374A was designed such that its capabilities and performance 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.

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Headphone Output: Type: 2-channel Compatibility: intended for connection to stereo (dual-channel) or monaural (single-channel) headsets with nominal impedance of 50 ohms or greater Maximum Output Voltage: 3.8 Vrms, 1 kHz, 150 ohm load Frequency Response: 20 Hz to 10 kHz, –3 dB Distortion (THD+N): <0.002% Dynamic Range: >100 dB

The Model 374A 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.

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: 5 to 95%, non-condensing Altitude: not characterized

Four audio channels arrive via Dante and are destined for the 2-channel headphone output. Each input source can be independently routed to the left headphone channel, right headphone channel, or both the left and right headphone channels. This flexibility allows a variety of listening environments to be created, including stereo, single-channel monaural, and dual-channel monaural.

Two bi-color LEDs provide an indication of the Dante connection status. The Dante Controller's Identify command takes on a unique role with the Model 374A. Not only will it cause the talk button LEDs to light in a unique highly visible sequence, it can also be configured to turn off any active talk channels.

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Set up and configuration of the Model 374A is simple. An etherCON® RJ45 receptacle is used to interconnect with a standard twisted-pair Ethernet port associated with a local-area network (LAN). This connection provides both power and bidirectional digital audio. A broadcast or intercom-style stereo or monaural headset with a dynamic or electret (DC-powered) microphone interfaces with the unit using a 5-pin XLR connector.

The STcontroller software application is used to select the unit's operating parameters. Four talk pushbutton switches can be configured for optimal operation. Four push-in/push-out ("pop out") rotary controls make it easy to set and maintain the desired headphone output level. The Model 374A's enclosure is made from an aluminum alloy which offers both light weight and ruggedness. A stainless steel "belt clip," located on the back of the unit, allows direct attachment to a user's clothing.

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Audio input signals arrive via four Dante receiver channels. The supported sampling rate is 48 kHz with a bit depth of up to 24. The audio signals pass into the Model 374A's processor where channel routing, headphone level control, and sidetone creation are performed within the digital domain. This provides flexibility, allowing for precise control of the audio signals and eliminates the need for the four rotary level controls from having to directly handle analog audio signals. The audio signals destined for the 2-channel headphone output are sent to a high-performance digital-to-analog converter and then on to robust driver circuitry. High signal levels can be provided to a variety of headsets, headphones, and earpieces.

Mounting Options: intended for portable applications; contains integral belt clip; optional MBK-01 Mounting Bracket Kit allows Model 374A to be permanently mounted

A highlight of the Model 374A is its ability to be easily configured to meet the needs of specific users and applications. All configuration choices are made using the STcontroller software application that communicates with the Model 374A by way of an Ethernet network connection. Configurable parameters include microphone power and preamplifier gain, sidetone audio operation, talk button operation, and headphone monitoring.

The Model 374A connects to an Ethernet data network using a standard 100 Mb/s twisted-pair Ethernet interface. The physical interconnection is made by way of a Neutrik® etherCON RJ45 receptacle. While compatible with standard RJ45 plugs, etherCON allows a ruggedized and locking interconnection for harsh or high-reliability environments. An LED displays the status of the network connection.

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