Studio Technologies has introduced the Model 44D Audio Interface. The Model 44D provides a simple yet high-performance means of interfacing two channels of analogue line-level audio to and from applications that use Dante audio-over-Ethernet media networking technology. Two Model 44D units can also provide one-to-one signal paths, two in each direction, over a standard local area network (LAN).
‘The Model 44D is a fully professional product that offers the audio quality, features and reliability required by 24-hour, on-air broadcast and other commercial applications,’ says Studio Technologies President, Gordon Kapes. ‘It is designed as a bridge, using Dante to link analogue or other Dante interfaces found on devices such as matrix intercom systems, broadcast routers and audio consoles. An Ethernet connection is all that’s required to make the Model 44D part of a sophisticated, networked audio system.’
Dante audio-over-Ethernet provides an easy-to-use, high-quality audio ‘backbone’ for a variety of fixed and field audio infrastructures, with deployment increasing dramatically over recent years. The Model 44D is a general-purpose tool that helps to expand Dante’s capabilities to facilities and equipment that primarily support signals in the analogue domain and its key features reflect this. The Model 44D also supports transport of contact closures or status signals between Model 44Ds and other compatible products. Each unit provides two general-purpose inputs (GPIs) and two general-purpose outputs (GPOs). In-band audio signals (20kHz tones) are used to transport the signals through the Dante paths.
Two line-level audio inputs use standard 3-pin female XLR connectors for easy interfacing with balanced and unbalanced sources. The input audio signals are converted to 24-bit digital and then transported via Dante. Two digital audio signals arrive via the Model 44D’s Dante interface and are then converted to analogue. Two 3-pin male XLR connectors on the unit’s back panel provide balanced line-level outputs. A 9-pin D-sub connector, also located on the back panel, is used to interface with the GPI and GPO signals.
For compatibility with SMPTE and EBU applications, a configuration choice allows the nominal level of the input signals to be +4dBu or 0dBu. The unit provides two analogue line-level output channels, which can also be set to +4dBu or 0dBu. Both inputs and outputs are electronically balanced, capacitor coupled and ESD (static) protected.
The Model 44D provides four five-segment LED meters located on the front panel. These display the level of the audio signals associated with the two line inputs and two line outputs. At the time of installation and set-up, the meters are invaluable in helping to confirm correct operation. During normal operation the meters offer direct confirmation of the unit’s audio signal levels, helping to ensure optimal audio quality.
The Model 44D’s operating power can be provided via the Ethernet interface using the Power-over-Ethernet (PoE) standard. The unit can also be powered using an external source of 12V DC. The unit connects to a data network using a standard 100Mb/s twisted-pair Ethernet interface, with the physical interconnection made by way of a Neutrik etherCon RJ45 connector. The compact, lightweight enclosure is applicable for tabletop or portable applications. To support rack-mounting optional front panels are also available.
The audio circuitry was designed in the spirit of professional audio equipment rather than that found in typical commercial audio gear. High-performance components are used throughout, providing low distortion, low noise and high headroom. Signal integrity is maintained in both the analogue and digital domains.
The Model 44D complements Studio Technologies’ recently introduced Model 43D Dante-to-IFB Interface, designed for broadcast and related IFB and talent cue applications. Two independent, two-channel powered IFB outputs provide audio and 28V DC for supporting connection of portable listen-only user beltpack devices. Two transformer-balanced -10dB line level analogue outputs are provided for connection to devices such as wireless IFB transmitters, battery-powered user beltpacks and amplified loudspeakers.
More: www.studio-tech.com
