Product: StudioComm 76DB/77B All-Digital 5.1 Surround Monitoring System
Optimized for Broadcast
Overview
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.
Model 76DB Central Controller
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 provides 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.
Model 77B and Model 71 Control Consoles
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 (refer to "Dialnorm Support" below).
The Model 71 Control Console works with the Model 77B to provide additional user locations with the most frequently desired functions: level adjustment, reference level, and dim.
One Model 76DB Central Controller can support a combination of up to four Model 77B or Model 71 Control Consoles.
Dialnorm Support
The dialog normalization "dialnorm" value is an integral part of many broadcast distribution systems and represents the average dialog level of an associated audio program, ending up as part of consumer audio playback systems. The dialnorm level value is a component of the Dolby E metadata, and when de-embedded, can be "read" by the Model 76DB Central Controller and displayed on the 77B Control Console. By automatically adjusting the surround monitor output level in response to the dialnorm value, a professional broadcast or post-production environment can more accurately simulate the end user's experience.
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Highlights
- 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)
Product Information Downloads
Which StudioComm system is right for your application? Review the StudioComm Loudspeaker Monitor Control Feature-by-Feature Comparison Chart.
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: 135 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
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, DARS (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: 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 (DB-25F)
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 (DE-9F), 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 (DE-9F)
Remote Control Inputs: three
Functions: remote mute all, remote dim, remote auxiliary stereo monitor output on/off
Type: +5 V logic, activates on closure to system common
Connector: 9-pin D-subminiature female (DE-9F), 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):
19.0 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)
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 nominal (9 volts DC minimum), 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 (DE-9F)
Dimensions (Overall):
7.2 inches wide (18.3 cm)
2.2 inches high (5.6 cm)
5.4 inches deep (13.7 cm)
Weight: 1.7 pounds (0.8 kg)
Model 71 Control Console
Application: up to three Model 71 Control Consoles can be connected to a Model 76DB Central Controller
Power: 12 volts DC nominal (9 volts DC minimum), maximum current 35 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 (DE-9F)
Dimensions (Overall):
3.2 inches wide (8.1 cm)
2.2 inches high (5.6 cm)
4.1 inches deep (10.4 cm)
Weight: 0.8 pounds (0.4 kg)
Specifications subject to change without notice.
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