Studio Technologies Model 76DA
StudioComm for Surround system Central Controller


The Studio Technologies Model 76DA Central Controller is part of their StudioComm for Surround system, addressing the monitoring challenges of today's sophisticated audio protocols. Control over the unit is provided by either the Model 77 or the Model 71 Control Consoles (both sold separately). Up to (4) Model 77s or up to (3) Model 71s can be used with the Model 76DA.

Model 76DA Central Controller
At the core of the system is the Model 76DA Central Controller. It's a 1RU unit that contains compatible circuitry for digital audio inputs, digital and analog monitor outputs, processing, and the user interface. It provides (2) surround (5.1) and (3) stereo digital audio inputs. The unbalanced digital inputs are AES3-compliant; as sources of this type can be found in most post-production and broadcast environments. The inputs directly support up to 192 kHz sample rate, up to 24-bits. One of the stereo inputs provides sample rate conversion (SRC) capability, allowing a wide range of digital audio sources to be monitored, and up to 340 milliseconds of input delay can be selected to compensate for processing delays in an associated video path. For flexibility, 2 delay values can be configured, allowing real-time selection as needed. A number of different signals can serve as the Model 76DA's digital audio timing reference. For synchronization with a master timing reference, a dedicated source of word clock, DARS (AES11), bi-level video, or tri-level video can be connected. Alternately, the L/R connection of the actively selected surround or stereo input source can serve as the timing reference.

A range of digital and analog surround (5.1) and stereo digital monitor outputs are provided. The post-fader surround and stereo digital and analog monitor outputs are intended for monitor loudspeaker system connection. The pre-fader surround digital monitor output can be used with metering systems that require signals not affected by level control or other monitoring functions. The stereo input C direct digital monitor output allows an installation to directly access the SRC capabilities.

For installation flexibility the digital monitor outputs can be set up for use with equipment that requires balanced or unbalanced AES3 digital audio signals. When selected for balanced AES3 compatibility, the output impedance is 110 ohms and a signal level of 5 volts peak-to-peak (Vpp). For unbalanced AES3 operation, the impedance is 75 ohms with 1 Vpp level.

Integral to the Model 76DA's design is a sophisticated bass management function that can be enabled if desired. It can apply to both the surround and stereo digital and analog post-fader monitor output channels. Note however that the bass management function works at sample rates of 44.1, 48, 88.2, and 96 kHz. The overall goal of bass management is very simple: to ensure that the entire audio bandwidth of all channels can be accurately monitored. Many loudspeaker systems have inherent low-frequency limitations, preventing a true representation of of the source material. To overcome this, the low-frequency energy from the 5 surround and 2 stereo channels can be separated and then routed to a subwoofer. Several of the bass management functions can be configured to match the requirements of specific installations.

In designing the system's architecture, great care was taken to ensure preservation of the character of the audio input signals. All audio processing, including bass management, is done in 32-bits with a high-speed field-programmable gate array (FPGA) integrated circuit.

Digital audio sources interface with the Model 76DA using (9) BNC connectors. A tenth BNC connector is used by the sync source. Digital and analog monitor output signal connections are made via (2) 25-pin female D-subminiature connectors. One 9-pin female D-subminiature connector is used to connect the Model 76DA with Model 77 or Model 71 Control Consoles (both sold separately). A second 9-pin female "D-sub" connector is used to interface with remote control signals. AC mains power is connected directly to the unit, with an acceptable range of 100 to 230 volts at 50/60 Hz.

Studio Technologies Model 76DA Central Controller Specifications:

Note: All specifications and more information available by clicking on the "Studio Technologies Model 76DA/Model 77 Datasheet" under the "DOCUMENTATION" tab, above.

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