Studio Technologies MODEL-76DB/77B

The all-digital StudioComm 76DB/77B Surround Monitoring System with digital inputs and outputs enables simple and effective monitoring of 5.1 surround and stereo audio material. Comprised of a Model 76DB Central Controller and a Model 77B Control Console, this system is especially well suited for broadcast master control and post-production applications with digital input loudspeakers.

The Model 76DB Central Controller is rack mountable and offers two surround (5.1) and three stereo (2-channel) digital inputs that are compatible with AES3id sources. Sample rates of up to 192 kHz and bit depth of up to 24 are directly supported. Exceptional dynamic range and extremely low distortion ensure that the audio quality of each source is maintained. Sample rate conversion (SRC) is available on one input (stereo input C).

The Model 76DB Central Controller offers 16 digital output channels with transformer-coupled outputs and selectable impedance (75 or 110 ohms):

• Pre-fade surround (5.1)
• Post-fade surround (5.1)
• Auxiliary stereo (2-channel) for special applications such as monitoring site-event cue signals
• Stereo input C direct output

The Model 76DB's sync input allows support for video (bi-level and tri-level), word clock, DARS, and AES3id. There is also an auxiliary stereo (2-channel) output for special applications such as monitoring site-event cue signals. In addition, up to 340 milliseconds of digital delay can be selected to compensate for processing delays in an associated video path.

The Model 77B Control Console is the "command center." Designed to reside at an operator's location, it allows fingertip selection of all monitoring functions. Numerous LED indicators provide complete status information. Up to six unique input choices are available. Each of the choices can be configured from the system's two surround (5.1) and three stereo (2-channel) inputs. The configuration mode also allows stereo inputs A and B to be used as either stereo or dual monaural sources. This can be especially useful in broadcast applications where a 2-channel AES3id source may carry two independent monaural signals.

A large, easy-to-use rotary digital encoder provides control of the surround monitor output level in precise 0.5-dB steps. A 4-digit numeric display indicates the monitor output or dialnorm level in real time. The monitor output level can be adjusted via the rotary level control, the reference level function, or by way of the dialnorm information included in Dolby E metadata.

One Model 76DB Central Controller can support a combination of up to four Model 77B or Model 71 Control Consoles.

Features:

• Digital audio inputs
• Digital audio outputs
• Flexible input source selection
• Downmix
• Dolby® E dialnorm support
• Level adjustment, reference level, and dim
• Auxiliary monitor output (2-channel)

Specifications:

Model 76DB Central Controller

• 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
  Dynamic Range: 134 dB
  Input-to-Output Latency: one sample (e.g., 0.021 milliseconds @ 48 kHz sample rate)
• Digital Audio Inputs: five (18 audio channels)
  Configuration: two surround (5.1) and three stereo (2-channel)
  Type: AES3id-2001/SMPTE 276M (75 ohms, unbalanced)
  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 Input:
  Sources: word clock, DARS (AES11), AES3id, 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: four (16 audio channels)
  Configuration: organized as two surround (5.1), one auxiliary stereo, and one stereo input C direct output
  Type: AES3 (110 ohms/5 Vpp) or AES3id/SMPTE 276M (75 ohms, 1 Vpp), selectable
  Connector: 25-pin D-subminiature female
• Configurable Delay: 0 to 340 milliseconds @ 48 kHz sample rate (scaled up or down depending on actual sample rate)
• Downmix:
  Functions: 5.1 to stereo, stereo to mono
  5.1 to Stereo: LS @ –3 dB summed with L; RS @ –3 dB summed with R; C @ –6 dB summed with L and R; LFE @ –6 dB summed with L and R (if enabled); C, LFE, LS, and RS monitor outputs mute
  Stereo to Mono: L @ –3 dB summed with R @ –3 dB to C; L, R, LS, RS, and LFE monitor outputs mute. (For a surround input this results in the C output being the sum of L @ –3 dB, R @ –3 dB, C @ –3 dB, LFE @ –3 dB (if enabled), LS @ –6 dB, and RS @ –6 dB.)
• Dolby E Metadata Input:
  Type: RS-485/RS-422
  Data Rate/Format: 115.2 kbit/s, 8-N-1
  Connector: 9-pin D-subminiature female (shared with remote control inputs)
• 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
• Remote Control Inputs: three
  Functions: remote mute all, remote dim, remote auxiliary monitor output on/off
  Type: +5 V logic, activates on closure to system common
  Connector: 9-pin D-subminiature female (shared with metadata input)
• AC Mains:
  Requirement: 100 to 230 V, 50/60 Hz, 15 watts maximum
  Connector: 3-blade, IEC 320 C14-compatible (mates with IEC 320 C13)
• Dimensions (Overall):
  19.00 inches wide (48.3 cm)
  1.72 inches high (4.4 cm)
  7 inches deep (17.8 cm)
• Mounting: one space in a standard 19-inch rack
• Weight: 6.2 pounds (2.8 kg)

Model 77B Control Console

• Application: up to four Model 77B Control Consoles can be connected to a Model 76DB Central Controller
• Power: 12 volts DC, maximum current 100 milliamperes, provided by Model 76DB Central Controller
• Control Data:
  Type: RS-485
  Data Rate/ Format: 115.2 kbit/s, 8-N-1
  Connector: 9-pin D-subminiature female
• Dimensions (Overall):
  7.20 inches wide (18.3 cm)
  2.20 inches high (5.6 cm)
  5.40 inches deep (13.7 cm)
• Weight: 1.7 pounds (0.8 kg)

TMGR# MODEL-76DB/77B