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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").
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.
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)
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, 35 milliamperes maximum, 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):
3.20 inches wide (8.1 cm)
2.20 inches high (5.6 cm)
4.10 inches deep (10.4 cm)
Weight: 0.8 pounds (0.4 kg)
Specifications
subject to change without notice.
StudioComm Systems
Which
StudioComm system is right for your application? Review the
StudioComm
Loudspeaker Monitor Control Systems Feature-by-Feature Comparison Chart.
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