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  Studio Technologies Model 76DA/77 Surround Monitoring System

Studio Technologies Model 76DA/77
Studio Technologies Model 76DA/77
List Price: $3,800.00
Our Price: $3,800.00

Availability: Usually Ships in 24 Hours
Product Code: 9999-06409


Studio Technologies Model 76DA/77 Surround Monitoring System

Studio Technologies StudioComm 76DA/77 Digital and Analog 5.1 Surround Monitoring System

Studio Technologies StudioComm 76DA/77 Digital and Analog 5.1 Surround Monitoring System Details

The all-digital Studio Technologies StudioComm 76DA/77 Surround Monitoring System with digital inputs and digital and analog outputs enables simple and effective monitoring of 5.1 surround and stereo audio material. Comprised of a Model 76DA Central Controller and a Model 77 Control Console, this system is ideal for recording, post production, and broadcasting applications with digital-input loudspeakers.

A StudioComm for Surround system starts with the Model 77 Control Console. It's the system's "command center" and is designed to reside at an operator's location, allowing fingertip selection of all monitoring functions. Numerous LED indicators provide complete status information. A 4-digit numeric display indicates the post-fader monitor output level in real time. A major strength of the Model 77 is its ability to configure, under software control, many important operating parameters. Intended for secondary monitoring locations, the Model 71 Control Console is a compact user control surface. It provides three of the most basic functions: a rotary level control, dim on/off button, and reference level on/off button.

StudioComm Model 77 5.1 Surround Control Console

While many installations will use only one Model 77 Control Console, up to three additional Model 77 or Model 71 Control Consoles can also be connected. This provides multiple users with full control over a facility's monitor system. And to make installation simple, the Model 76DA provides power for all connected Model 77 or Model 71 units.

Model 76DA Central Controller

The core of this StudioComm for Surround system is the Model 76DA Central Controller. The one-rack-space unit contains circuitry that supports digital audio inputs, digital and analog monitor outputs, processing, and the user interface. The Model 76DA provides two surround (5.1) and three stereo digital audio inputs. These unbalanced digital inputs are AES3id/SMPTE 276M-compliant; sources of this type are ubiquitous in most post-production and broadcast environments. The inputs allow a sample rate of up to 192 kHz and a bit depth of up to 24 to be directly supported. Circuitry associated with one of the stereo inputs provides sample rate conversion (SRC) capability, allowing a wide range of digital audio sources to be monitored. Up to 340 milliseconds of input delay can be selected to compensate for processing delays in an associated video path. 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, DRS (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 connection to monitor loudspeaker systems. The pre-fader surround digital monitor output can be used with metering systems that require signals that aren't impacted 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 configured for compatibility with equipment that requires AES3 ("balanced") or AES3id ("unbalanced") digital audio signals. When selected for AES3 compatibility the output impedance is 110 ohms with a signal level of 5 volts peak-to-peak (Vpp). For AES3id operation the impedance is 75 ohms and the level is 1 Vpp.

A sophisticated bass management function is integral to the Model 76DA's design and can be enabled if desired. It can apply to both the surround and stereo digital and analog post-fader monitor output channels. The overall goal of bass management is very simple: ensure that the entire audio bandwidth of all channels can be accurately monitored. Many loudspeaker systems have inherent low-frequency limitations, preventing a true picture of the source material from being presented. To overcome this, the low-frequency energy from the five surround and two stereo channels can be separated and then routed to the subwoofer loudspeaker. Several of the bass management functions can be configured to match the requirements of specific installations.

Great care was taken in designing the system's architecture, ensuring that the character of the audio input signals is preserved. All audio processing, including bass management, is performed in 32 bits using a high-speed field-programmable gate array (FPGA) integrated circuit.

The Model 76DA occupies one space (1U) in a standard 19-inch rack. Digital audio sources are interfaced with the Model 76DA using nine BNC connectors. A tenth BNC connector is used by the sync source. Digital and analog monitor output signal connections are made using two 25-pin D-subminiature connectors. One 9-pin D-subminiature connector is used to connect the Model 76DA with up to four Model 77 or Model 71 Control Consoles. A second 9-pin "D-sub" connector is used to interface with remote control signals. AC mains power is connected directly to the Model 76DA, with an acceptable range of 100 to 230 volts, 50/60 Hz.

Studio Technologies StudioComm 76DA/77 Digital and Analog 5.1 Surround Monitoring System Features

  • Digital audio inputs
  • Digital and analog monitor outputs
  • Bass management capability
  • Configurable downmix
  • Channel mute/solo
  • Level adjustment, reference level, and dim
  • A new software release adds enhanced capabilities to the StudioComm 76DA/77 system. To support a broader range of loudspeaker systems an advanced set of bass management resources has been added. The bass management function redirects low-frequency energy from the main channels, combines it with the LFE content, then routes the sum to the subwoofer output. The downmix capability of the 76DA/77 has also been enhanced with the addition of configurable level coefficients.

Studio Technologies StudioComm 76DA/77 Digital and Analog 5.1 Surround Monitoring System Specifications

  • General Audio:
    • Supported Sample Rates: 32, 44.1, 48, 88.2, 96, 176.4, and 192 kHz
    • Word Length: 24 bits maximum
    • Internal Processing: 32 bits
    • Input-to-Output Latency: two samples (e.g., 0.042 milliseconds @ 48 kHz sample rate)
    • Digital Audio Inputs: five (18 audio channels)
    • Configuration: two surround (5.1) and three stereo
    • Type: AES3id-2001/SMPTE 276M (unbalanced 75 ohms/1 Vpp)
    • Connectors: BNC (per IEC 60169-8 Amendment 2
  • Sample Rate Conversion (SRC):
    • Application: available on Stereo Input C
    • Input Sample Rate Range: 8 to 216 kHz, limited to 1/6 to 6 times the output sample rate
    • Latency: 1 millisecond, nominal
    • Sync Source: configured to follow L/R of currently selected input or signal connected to sync input
  • Sync Input:
    • Compatible Sources: word clock, DRS (AES11), bi-level video, tri-level video
    • Jitter: 4 ns pp maximum
    • Connector: BNC (per IEC 60169-8 Amendment 2)
    • Termination: 75 ohms, selectable on/off
    • Digital Monitor Outputs: 16 (eight pairs)
    • Configuration: organized as two surround (5.1) and two stereo
    • Dynamic Range: 135 dB
    • Type: AES3 (110 ohms/5 Vpp) or AES3id/SMPTE 276M (75 ohms/1 Vpp), selectable
    • Connector: 25-pin D-subminiature female (DB-25F)
    • Analog Monitor Outputs: 8
    • Configuration: organized as one surround (5.1) and one stereo (2-channel)
    • Type: electronically balanced, source impedance 200 ohms
    • Nominal Level: +4.0 dBu @ ?"20 dBFS input source and level control at maximum setting
    • Maximum Level: +24 dBu into 2000 (2 k) ohms or greater
    • Frequency Response, Digital Inputs to Analog Monitor Outputs: 10 Hz-20 kHz +0.0/?"0.3 dB @ 48 kHz sample rate; ?"3 dB @ 64 kHz
    • Distortion (THD+N): 0.004%, ref 1 kHz, +4 dBu output
    • S/N Ratio: 89 dB, ref +4 dBu output
    • Dynamic Range: greater than 109 dB
    • Crosstalk: ?"98 dB at 1 kHz; ?"97 dB at 16 kHz, ref ?"1 dBFS input
    • Connector: 25-pin D-subminiature female (DB-25F)
    • Configurable Delay: 0 to 340 milliseconds @ 48 kHz sample rate (scales up or down depending on actual sample rate)
    • Post-Fader Monitor Output Level Offsets: each surround and stereo channel independently adjustable in 0.5-dB steps over a ±12-dB range. (Digital and analog outputs associated with a specific channel share the same setting.)
  • Bass Management:
    • Crossover Frequency and Type: ?"6 dB @ 80 Hz, symmetrical for low-pass and high-pass filters, maximally flat
    • Filter Slope: 12 or 24 dB/octave
    • Overall Operation: independent on/off selectable for surround and stereo post-fader monitor outputs
  • Downmix:
    • Functions: surround to stereo, stereo to mono
      • Surround to Stereo:
        • L @ 0 or ?"3 dB;
        • R @ 0 or ?"3 dB;
        • C @ ?"3 or ?"6 dB summed with L and R;
        • LFE @ full attenuation or ?"6 dB summed with L and R;
        • LS @ ?"3 or ?"6 dB summed with L;
        • RS @ ?"3 or ?"6 summed with R;
        • C, SUB, LS, and RS monitor outputs mute
      • Stereo to Mono:
        • L @ ?"3 dB summed with R @ ?"3 dB to C;
        • L, R, LS, RS, and SUB monitor outputs mute
      • For a surround input this results in the C output being the sum of L @ ?"3 or ?"6 dB, R @ ?"3 or ?"6 dB; C @ ?"3 or ?"6 dB, LFE @ full attenuation or ?"6 dB;
      • LS @ ?"6 or ?"9 dB, and RS @ ?"6 or ?"9 dB.
  • Control Console Interface:
    • Type: RS-485, 115.2 kbit/s, 8-1-N
    • Polling Interval: 50 milliseconds
    • Power: 12 volts DC, 500 milliamperes maximum
    • Connector: 9-pin D-subminiature female (DE-9F)
    • Remote Control Inputs: 2
    • Functions: remote mute all, remote dim
    • Type: +5 V logic, activates on closure to system common
    • Connector: 9-pin D-subminiature female (DE-9F)
  • AC Mains:
    • Requirement: 100 to 230 V, +10/?"15%, 50/60 Hz, 15 W maximum
    • Connector: 3-blade, IEC 320 C14-compatible (mates with IEC 320 C13)
  • Physical Specifications:
    • Dimensions (Overall):
      • 19.0 inches wide (48.3 cm)
      • 1.72 inches high (4.4 cm)
      • 7.0 inches deep (17.8 cm)
    • Mounting: one space (1U) in a standard 19-inch rack
    • Weight: 6.2 pounds (2.8 kg)

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