AudioArts Engineering D-76 User manual
D-76
Digital Audio Console
Technical Manual
February 2015
D-76 / Feb 2015
D-76 Digital Audio Console Technical Manual
©2015 Audioarts®Engineering*
AUDIOARTS ENGINEERING
600 Industrial Drive
New Bern, North Carolina 28562
252-638-7000
*a division of Wheatstone Corporation
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D-76 / Mar 2015D-76 / June 2015
Attention!
Federal Communications Commission (FCC) Compliance
Notice:
Radio Frequency Notice
NOTE: This equipment has been tested and found to comply with the
limits for a Class A digital device, pursuant to Part 15 of the FCC rules.
These limits are designed to provide reasonable protection against harmful
interference when the equipment is operated in a commercial environment.
This equipment generates, uses, and can radiate radio frequency energy and,
if not installed and used in accordance with the instruction manual, may cause
harmful interference to radio communications. Operation of this equipment
in a residential area is likely to cause harmful interference in which case the
user will be required to correct the interference at his own expense.
This is a Class A product. In a domestic environment,
this product may cause radio interference, in which case,
the user may be required to take appropriate measures.
This equipment must be installed and wired properly in order to assure
compliance with FCC regulations.
Caution!
Any modications not expressly approved in writing by
Wheatstone could void the user's authority to operate this equipment.
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D-76 / Feb 2015
Attention!
This console contains static sensitive devices:
Normal precautions against static discharge should be observed when
handling individual modules. In particular, modules being packed for
shipping for return or repair must be packed in special static protection bags
before packaging. Damage caused by static discharge may not be covered
under warranty.
Replacing Modules in a Powered-up Console:
While in an emergency situation it is possible to remove and insert
modules on a powered-up console, Wheatstone does not recommend this
procedure. Whenever possible it is best to power down the console rst
before removing or replacing modules.
However, if you nd you must proceed with this operation, then be sure
to take the following precaution:
When re-inserting a module, take care to replug it squarely into
its mainframe connector socket, so all edgecard ngers make contact
simultaneously. In other words, the gold-plated bus connector ngers on the
bottom edge of the module's printed circuit board must be inserted squarely
(i.e., perpendicular) to the mating socket on the bottom pan of the console
mainframe. The intent is to prevent a situation where one of the module's
power pins makes signicant contact before the others. (Naturally, this
same precaution must be taken when using extenders.)
If the above instructions are followed the procedure should be routine;
if they are not, you could run the risk of damaging the console's logic chips.
Again, to avoid ANY possibility of this damage, whenever possible
we strongly recommend powering down the console before replacing any
modules.
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D-76 / Feb 2015
IMPORTANT!
D-76 Audio Levels
General
All professional digital audio broadcast consoles manufactured by Wheatstone are hybrid in
nature. That is, they allow the user to connect both analog and digital domain sources and
provide both analog and digital outputs. While this approach allows for greater exibility
when interconnecting source and destination equipment, the user must be aware of what
levels to expect when applying, say, a digital input and measuring at an analog output.
Gain Structure
Broadcast consoles by design have various electronic stages at which the signal level may
be amplied or attenuated. The primary stages are the A-D converter input, channel fader,
DSP mixing and the bus output D-A converters. The sum of these gain stages is commonly
referred to as the console’s “gain structure.” Wheatstone consoles are factory calibrated for
0dB or “unity gain” when the input channel fader is set to nominal (-12dB).
The following is a stage by stage breakdown of a typical console’s gain stages:
Analog Input (A-D Converter)
• The ADC input circuit cards are designed so that a +4dBu input signal will yield
a -20dBFS digital output with the channel fader at nominal.
• An input gain adjust switch setting can be changed to increase the gain by 8dB
to allow for interfacing unbalanced equipment.
• Mic level preamps have trim pots for matching various microphone source levels
to the console’s normal +4dBu analog operating level.
DSP Gain
• Set in rmware for unity gain (-20dBFS input yields a -20dBFS output when the
input channel fader is set to nominal), digital attenuation may be applied on a
channel by channel basis via a dipswitch setting.
Analog Bus Output Gain (D-A Converter)
• • The analog output DAC circuits are designed so that a -20dBFS digital input
signal will yield a +4dBu analog output with the channel fader at nominal.
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D-76 / Feb 2015
Audio Reference Levels
All consoles are fully factory calibrated and will comply with the following reference level:
-20dBFS digital = +4dBu analog = 0VU Note: 0dBu = .775v rms
+4dBu = 1.23v rms
These settings will provide a headroom of 20dB over the nominal input signal of +4dBu
analog, or -20dBFS digital.
Note that due to the lack of level standards in the digital domain, headroom available for
digital sources will be entirely dependant on the source. In fact, CD's are frequently made
with less than 1dB of digital headroom, and any boosting of digital CD levels in the console
by moving the fader up above the nominal can result in overload distortion for that channel.
For this reason, a dipswitch allows for digital attenuation on a fader by fader basis; digital
sources can be conveniently attenuated this way to guard against digital overload caused by
not enough headroom on the digital source. Since the D-76 console meters are true digital
reading meters, they will always show the console's digital levels, and whether there are any
"overs" in the signal. By pressing a channel's "CUE" button, the switched meters will show
the digital level of that channel's source, as modied by the dipswitch setting. By using the
program and watching these meters, the amount of attenuation can be adjusted to meet your
headroom requirements.
Typical Input Levels
Mic Inputs Nominal = -50dBm, 150Ω Maximum = -26dBm
Analog Inputs Nominal = +4dBu Maximum = +24dBu
Digital Inputs Nominal = -20dBFS Maximum = 0dBFS
Important
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D-76 / Feb 2015
CONTENTS
Chapter 1 - Installation and Power
Chapter 2 - Quad Mic Preamp
D-76 Technical Manual
Table of Contents
Console Overview .........................................................................1-2
Unpacking The Console................................................................1-3
Countertop Mounting ....................................................................1-3
System Ground..............................................................................1-4
The First Step Is To Ground The Console ..................................................................1-4
Further Grounding Details ..........................................................................................1-5
Power Supply.................................................................................1-6
Energizing...................................................................................................................1-7
Audio and Control Wiring .............................................................1-7
Digital Audio Connections..........................................................................................1-7
Unbalanced Connections (analog audio) ...................................................................1-8
Modules Layout .............................................................................1-8
Input Daughter Cards Installation................................................1-9
D-76-12 Console Modules Layout Drawing................................1-10
D-76-20 Console Modules Layout Drawing................................1-11
Overview.........................................................................................2-2
Internal Programming Options.....................................................2-3
Phantom Power..........................................................................................................2-3
Hook-Ups........................................................................................2-3
Audio Input Connections............................................................................................2-3
Audio Output Connections.........................................................................................2-3
Power Connections ....................................................................................................2-4
Plug Terminal/ RJ-45 Pinout Drawing..........................................2-5
Installing The Optional Second QMP4-76 Mic Preamp ..............2-6
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D-76 / Feb 2015
CONTENTS
Module Overview...........................................................................3-2
Internal Programming Options.....................................................3-3
Mutes..........................................................................................................................3-3
Tallies..........................................................................................................................3-3
Timer Restart..............................................................................................................3-3
Talkback .....................................................................................................................3-3
Attenuation .................................................................................................................3-4
EFS - European Fader Start .......................................................................................3-4
UTIL Pre-Fade/Pre-On Defeat....................................................................................3-4
B Source Logic Options .............................................................................................3-5
External AES Sync Input ............................................................................................3-5
Hook-Ups........................................................................................3-7
Analog Audio Connections (ADC-76) .........................................................................3-7
Digital Audio Connections (SRC-76) ..........................................................................3-7
Logic Connections .....................................................................................................3-7
Remote ON/OFF.....................................................................................................3-7
Cough.....................................................................................................................3-8
External Start/Stop.................................................................................................3-8
Ready .....................................................................................................................3-8
Talkback to Control Room......................................................................................3-8
On Tally...................................................................................................................3-8
B Tally .....................................................................................................................3-9
RJ-45 Connector Pinout Drawing ...............................................3-10
IN-76 Stereo Line Input Module Signal Flow Diagram ..............3-11
Module Overview...........................................................................4-2
Internal Programming Options.....................................................4-3
Sampling Frequency for Console Outputs .................................4-3
Hook-Ups........................................................................................4-4
RJ-45 Connector Pinout Drawing ................................................4-5
Output Module Signal Flow Diagram...........................................4-6
Module Overview...........................................................................5-2
Internal Programming Options.....................................................5-3
Cue Interrupt ..............................................................................................................5-3
CR/Cue Mute..............................................................................................................5-3
On-Air Tally Follows Program.....................................................................................5-3
Hook-Ups........................................................................................5-4
RJ-45 Connector Pinout Drawing ................................................5-5
Control Room Module Signal Flow Diagram...............................5-6
Chapter 4 - Output Module (OM-76)
Chapter 5 - Control Room Module (CR-76)
Chapter 3 - Stereo Line Input (IN-76)
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D-76 / Feb 2015
CONTENTS
Module Overview...........................................................................6-2
Internal Programming Options.....................................................6-3
External Talkback Mute/Dim ......................................................................................6-3
Studio Dim..................................................................................................................6-3
Studio Pre Mute .........................................................................................................6-3
Hook-Ups........................................................................................6-4
RJ-45 Connector Pinout Drawing ................................................6-5
Studio Control Module Signal Flow Diagram..............................6-6
Module Overview...........................................................................7-2
Caller Set-Ups............................................................................................................7-2
Automatic Features ....................................................................................................7-3
Inputs and Outputs.....................................................................................................7-3
Internal Programming Options.....................................................7-3
Cue Pre/Post ..............................................................................................................7-3
Mutes..........................................................................................................................7-3
Timer Restart..............................................................................................................7-4
Tallies..........................................................................................................................7-4
Cue Dropout...............................................................................................................7-4
External Input .............................................................................................................7-4
Gain Trimpots .............................................................................................................7-4
Hook-Ups........................................................................................7-5
External Start/Stop.....................................................................................................3-6
RJ-45 Connector Pinout Drawing ................................................7-6
Superphone Module Signal Flow Diagram..................................7-7
Module Overview...........................................................................8-2
Internal Programming Options.....................................................8-2
Hook-Ups .......................................................................................8-3
RJ-45 Connector Pinout Drawing ................................................8-4
Line Select Module Signal Flow Diagram....................................8-5
Module Overview...........................................................................9-2
Adding IP-76 to the Peripheral Devices Tab ...............................9-2
Chapter 6 - Studio Control Module (SC-76)
Chapter 7 - Superphone Module (SP-76) - optional
Chapter 8 - Line Select Module (LS-76) - optional
Chapter 9 - Network Module (IP-76) - optional
D-76 / May 2016
page Contents – 4
D-76 / Feb 2015
CONTENTS
Chapter 10 - Meterbridge
WheatNet-IP IP76 GUI....................................................................9-5
IP76 GUI Menu...........................................................................................................9-6
File..........................................................................................................................9-6
View........................................................................................................................9-6
WheatNet-IP System..............................................................................................9-6
Hardware ................................................................................................................9-8
Help ........................................................................................................................9-9
Device Properties ......................................................................................................9-10
Blades Tab.............................................................................................................9-10
Miscellaneous Tab.................................................................................................9-10
3rd Party Signal Name Prex ............................................................................9-10
Display Brightness.............................................................................................9-11
I/O Connections............................................................................9-12
Source Selection ..........................................................................9-12
OLED Display................................................................................9-12
IP-76 Menus...................................................................................9-13
Internal Programming Functions ................................................9-13
Hook-Ups.......................................................................................9-13
Audio Connection......................................................................................................9-13
Logic Connection ......................................................................................................9-14
Ethernet Interface......................................................................................................9-14
Typical Ethernet Cable ..........................................................................................9-14
RJ-45 Connector Pinout Drawing .............................................................................9-15
Overview........................................................................................10-2
Digital Timer..................................................................................10-2
Console Clock...............................................................................10-3
Setting The Time .......................................................................................................10-3
Capacitor Backup .....................................................................................................10-3
Operational Modes....................................................................................................10-3
24 Hour Mode .......................................................................................................10-3
External Sync ........................................................................................................10-3
Dim ........................................................................................................................10-4
Replacement Parts List.................................................................A-2
Appendix
Table of contents
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