Avid 9920-65110-00, 9905-65004-00, 9920-65109-00 User manual
HD OMNI Guide
Version 8.1
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contents
Chapter 1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
HD OMNI Features. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
What’s Included . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
System Requirements and Compatibility . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Registration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
About This Guide. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
About www.avid.com . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Chapter 2. HD OMNI Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
HD OMNI Front Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
HD OMNI Back Panel. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Chapter 3. Connecting HD OMNI . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Pro Tools|HD Systems. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Example Studio Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Chapter 4. Configuring HD OMNI in Pro Tools . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Pro Tools Hardware Setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Pro Tools I/O Setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
Chapter 5. SETUP Mode. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
SETUP Mode Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
Analog Output (OUTLVL). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
Analog Output Trim (OUTRIM). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
TRS Output Mirrors (TRSOUT) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
Fold Down (FOLDWN) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
Analog Line Input Reference Level (IN REF) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
Limiter (LIMITR) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
Internal Sample Rate (SRATE) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
Contents iii
Clock Source (CLOCK) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
Digital 1–2 Input Source (DIG1–2) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
Sample Rate Conversion (SRC1–2) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
SPL Display Calibration (SPLCAL). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
Fan Control (FAN) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
Firmware Version (VER). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
Factory Reset (RESET) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50
Display Contrast (CNTRST). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50
Appendix A. Pinout Diagrams for the DB-25 Connectors . . . . . . . . . . . . . . . . . . . . . . . 51
Analog Output DB-25 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
AES/EBU DB-25 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
Appendix B. Sound Pressure Level Display Calibration . . . . . . . . . . . . . . . . . . . . . . . . . 53
Appendix C. Compliance Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55
Environmental Compliance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55
EMC (Electromagnetic Compliance) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56
Safety Compliance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56
Index . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59
HD OMNI Guideiv
chapter 1
Introduction
HD OMNI is a professional digital audio interface designed for use with Pro Tools|HD
systems. HD OMNI provides a compact preamp,
input mixer, monitoring, and I/O solution for
music production and recording, and post
production studios.
®
HD OMNI Features
Analog I/O
• 24-bit analog-to-digital (A/D) and digital-toanalog (D/A) converters, with support for
sample rates up to 192 kHz
• 2 high-quality Mic/DI preamps (Channels
1–2)
• 2 combined XLR and 1/4-inch TRS front panel
inputs for microphone and instrument level
input
• 2 XLR back panel microphone inputs
• 2 1/4-inch TRS Send and 2 1/4-inch TRS Return back panel jacks for hardware inserts on
channels 1 and 2
• 4 analog TRS line level back panel inputs
(Channels 1–4)
HD OMNI provides multiple analog input
connections, but only provides up to four
channels of simultaneous analog input for
Pro Tools.
• Soft Clip and Curv limiting circuits to protect
against clipping on analog input.
• 8 channels of analog back panel output using
a DB-25 breakout cable (sold separately) with
variable output gain
• 2 channels of analog back panel output using
TRS (Mirrors channels 1–2 or 7–8 on DB-25
connector)
• Front panel stereo 1/4-inch headphone jack
Digital I/O
• 8 channels of AES/EBU output (up to 192 kHz
Single Wire) using a DB-25 breakout cable
(sold separately)
• 2 channels of AES/EBU XLR input (up to
192 kHz Single Wire)
• 2 channels of S/PDIF RCA input and output
(up to 192 kHz)
• 8 channels of ADAT TOSLINK input and output
• Support for ADAT S/MUX Optical for sample
rates of 88.2 kHz, 96 kHz, 176.4 kHz, and
192 kHz.
• Support for two channels of S/PDIF Optical
with sample rates of up to 96 kHz.
• Real-time sample rate conversion (SRC) on
Digital Inputs 1–2 of either AES/EBU, S/PDIF,
or Optical (S/PDIF)
SRC is not supported with ADAT S/MUX.
Chapter 1: Introduction 1
Monitoring
• An additional stereo “CUE” output path in
Pro Tools for headphone monitoring from the
front panel headphone jack
• Front panel Control Room (MAIN/ALT) and
Headphone monitoring volume control
• Flexible monitoring with fold-down from all
stereo and surround formats (up to 7.1 surround)
• Input mixer for low latency direct monitoring
of a variety of incoming signals (configured in
the Pro Tools Hardware Setup)
Synchronization
• Loop Sync input and output for connecting
additional Pro Tools|HD interfaces and peripherals
• External Clock input and output for synchronizing HD OMNI with external Word Clock
devices.
What’s Included
• HD OMNI audio interface
•AC power cable
• DigiLink to DigiLink Mini adapter cable
• BNC cable (18 inches [0.46m])
•HDOMNI Guide
• Health and Safety Guide
• Registration Information Card
System Requirements and Compatibility
HD OMNI requires a qualified Pro Tools|HD system. Pro Tools HD supports only one HD OMNI
per system.
Avid can only assure compatibility and provide
support for hardware and software it has tested
and approved.
For complete system requirements and a list of
qualified computers, operating systems, hard
drives, and third-party devices, visit:
www.avid.com/compatibility
Registration
Review the enclosed Registration Information
Card and follow the instructions on it to quickly
register your purchase online. By registering,
you become eligible to receive the following:
• Technical support information
• Software update and upgrade notices
• Hardware warranty information
About This Guide
This guide provides a basic overview of the
HD OMNI features and functionality.
For complete instructions on connecting and
configuring your Pro Tools|HD system, see the
Pro Tools|HD User Guide.
For additional information about using
Pro Tools software, see the Pro Tools Reference
Guide (in Pro Tools, choose Help > Pro Tools
Reference Guide).
HD OMNI Guide2
Conventions Used in This Guide
All of our guides use the following conventions
to indicate menu choices and key commands:
:
Convention Action
File > Save Choose Save from the
File menu
Control+N Hold down the Control key
and press the N key
About www.avid.com
The Avid website (www.avid.com) is your best
online source for information to help you get
the most out of your Pro Tools system. The following are just a few of the services and features
available.
Product Registration Register your purchase
online.
Control-click Hold down the Control key
and click the mouse button
Right-click Click with the right
mouse button
The names of Commands, Options, and Settings
that appear on-screen are in a different font.
The following symbols are used to highlight
important information:
User Tips are helpful hints for getting the
most from your system.
Important Notices include information that
could affect your data or the performance of
your system.
Shortcuts show you useful keyboard or
mouse shortcuts.
Cross References point to related sections in
this guide and other Pro Tools guides.
Support and Downloads Contact Avid Customer
Success (technical support); download software
updates and the latest online manuals; browse
the Compatibility documents for system requirements; search the online Knowledge Base
or join the worldwide Pro Tools community on
the User Conference.
Training and Education Study on your own using
courses available online or find out how you can
learn in a classroom setting at a certified
Pro Tools training center.
Products and Developers Learn about Avid
products; download demo software or learn
about our Development Partners and their plugins, applications, and hardware.
News and Events Get the latest news from Avid
or sign up for a Pro Tools demo.
Chapter 1: Introduction 3
HD OMNI Guide4
chapter 2
HD OMNI Overview
This chapter provides an overview of the front and back panel features of HD OMNI.
If you are installing your Pro Tools|HD system for the first time, see the Pro Tools|HD User Guide
for complete system installation and configuration instructions. If you are adding the HD OMNI to
an existing system, see the
HD OMNI Front Panel
HD OMNI Front Panel
Expanded Systems Guide.
Power Switch and LED Ring
This button turns HD OMNI on and off.
When powering on HD OMNI, the LED ring
around the power button lights green, flashes
amber, and then turns back to green.
The LED ring is amber when the unit has power,
unless Pro Tools is running. The LED lights
green only when Pro Tools is running.
CH1 and CH2 Inputs
The front panel Channel 1 (CH1) and Channel 2
(CH2) Inputs provide combined XLR and
1/4-inch TRS inputs for microphone and instrument level input. Use XLR for microphone connections and use 1/4-inch for instrument connections.
Chapter 2: HD OMNI Overview 5
Preamp Controls
The front panel Channel 1 and 2 inputs provide
high-quality Microphone and Instrument level
preamps. These two preamp channels can be
linked so that changing any parameter on either
channel causes an identical change to the other
preamp channel (this is useful for stereo
sources). When unlinked, the parameters for
each preamp can be set independently.
CH 1 and CH 2 MIC/LINE/DI Inputs, and Preamp
controls
Input Type Lets you select MIC, LINE, or INST for
input on Channels 1 and 2. The corresponding
LED lights to indicate which option is selected.
When MIC is selected, the back panel MICROPHONE inputs are used for channel 1 and 2 input, unless an XLR cable is connected to the
front panel CH1 or CH2 inputs, then the front
panel connection is used. Remove the XLR cable
from the front panel connector to regain use of
the rear panel MIC connection.
When LINE is selected, the back panel LINE IN 1
and 2 1/4-inch TRS inputs are used.
When INST is selected, the front panel 1/4-inch
TRS inputs are used.
When Link 1 & 2 is disabled, the Input Type can
be independently enabled (or disabled) on
Channels 1 and 2 by pressing the PREAMP Encoder to select the desired channel.
When the Input Type is set to LINE, the
PREAMP is bypassed. Also, the preamps for
the MIC/INST inputs do not change level
when LINE is selected, so you can easily revert back to MIC or INST input.
PAD Enables (or disables) a –20 dB pad for both
Channel 1 and Channel 2 inputs. The PAD button LED lights when the pad is enabled.
When Link 1 & 2 is disabled, PAD can be independently enabled (or disabled) on Channels 1
and 2 by pressing the PREAMP Encoder to select
the desired channel.
When using the INST input with some
instruments (such as a guitar or bass),
you may want to engage the Pad to avoid
clipping on input.
48V Enables (or disables) 48V phantom power
for the Channel 1 and Channel 2 XLR inputs.
The 48V button LED lights when the phantom
power is enabled. You can manually enable or
disable the 48V option only when the Input
Type is set to MIC. When switching to another
Input Type (such as LINE), phantom power continues to be supplied to the MIC channel.
When Link 1 & 2 is disabled, 48V can be independently enabled (or disabled) on Channels 1
and 2 by pressing the PREAMP Encoder to select
the desired channel.
Inserting or removing an XLR cable to or
from the front panel inputs automatically
disables phantom power (if it is on).
High Pass Filter Enables (or disables) a
12 dB/octave high-pass filter with a roll-off starting at 85 Hz for the Channel 1 and Channel 2
inputs. The High Pass Filter button LED lights
when the high-pass filter is enabled. This option
is not available when the Input Type is set to
LINE.
When Link 1 & 2 is disabled, the High Pass Filter
can be independently enabled (or disabled) on
Channels 1 and 2 by pressing the PREAMP Encoder to select the desired channel.
HD OMNI Guide6
Phase Invert Inverts the phase for the Channel 1
and Channel 2 front panel inputs. The Phase Invert button LED lights when this option is enabled.
INSERT Enables (or disables) the returns for any
hardware inserts connected to the back panel
Channel 1 and Channel 2 input and output
pairs. Note that the sends are always active.
When Link 1 & 2 is disabled, Phase Invert can be
independently enabled (or disabled) on Channels 1 and 2 by pressing the PREAMP Encoder to
select the desired channel.
PREAMP Display Shows the gain value (+10 to
+65 dB).
When Link 1 & 2 is disabled, gain boost or attenuation for either Channel 1 (P1) or Channel 2
(P2) can be independently adjusted by pressing
the PREAMP Encoder to select the desired channel.
PREAMP Encoder Lets you adjust the input gain
for MIC and INST inputs (by rotating the encoder), and toggle front panel controls between
the two preamp channels (by pressing). Press
the encoder to toggle between P1 and P2 (Channel and Channel 2). Turn the encoder clockwise
to increase and counterclockwise to decrease the
input gain for the selected channel (from +10 to
+65 dB). Gain can be adjusted in 1 dB increments.
LINK 1 & 2 Links (or unlinks) controls for the
Channel 1 and Channel 2 front panel inputs.
The Link 1 & 2 button LED lights when this option is enabled. If the two channels are linked,
when levels between channels 1 and 2 are different, the difference is maintained when changed
the levels until an upper or lower limit (+10 or
+65) is reached. When the upper or lower limit
is reached by one of the channels, you can continue to adjust the level of the other channel until the limit is reached, but the difference between the two channels is no longer
maintained.
When Link 1 & 2 is disabled, INSERT can be independently enabled (or disabled) on Channels
1 and 2 by pressing the PREAMP Encoder to select the desired channel.
Preamp Signal Path
The Channel 1 and Channel 2 front panel inputs use the following signal path:
Input Signal > Pad > Preamp > HPF > Insert >
Limiter > ADC > Phase Invert
Synchronization and Sample Rate
LEDs
Synchronization and Sample Rate LEDs
Sync Mode LEDs
The SYNC MODE LEDs indicate the current
Clock Source as set in the Pro Tools Hardware
Setup (see “Pro Tools Hardware Setup” on
page 23) or on HD OMNI in SETUP mode (see
“Clock Source (CLOCK)” on page 45).
INT (Internal) Indicates the HD OMNI sample
clock is generated by its internal crystal oscillator, as determined by the session Sample Rate.
EXT (External) Indicates that the HD OMNI is either using the EXT CLOCK IN port or a digital
source for system synchronization.
Chapter 2: HD OMNI Overview 7
When synchronized to Word Clock, External
Clock input and output do not have to be at the
Word clock rate. At 44.1 kHz and 48 kHz, EXT
CLOCK IN synchronization will be 1x the current session sample rate. However, for sample
rates higher than 48 kHz, HD OMNI generates a
choice of 1x, 2x, or 4x of a base rate of 44.1 kHz
or 48 kHz, as follows:
Session Sample Rate Word Clock Support
44.1 kHz 44.1 kHz
48 kHz 48 kHz
88.2 kHz 88.2 kHz
44.1 kHz
LOOP Indicates that the HD OMNI is slaving to
another Pro Tools|HD audio interface using
Loop Sync.
MST (Loop Master) Indicates which Pro Tools
audio interface is the master Pro Tools peripheral. The Loop Master LED will be continuously
lit on the current Loop Master peripheral only,
and unlit on all other peripherals. (Only one
Pro Tools audio interface can be Loop Master at
a time.) The Loop Master LED will always be lit
with a single interface.
For Pro Tools|HD systems, Loop Master defaults
to the first Pro Tools audio interface connected
to the primary, or “core” Pro Tools|HD card.
96 kHz 96 kHz
48 kHz
176.4 kHz 176.4 kHz
44.1 kHz
192 kHz 192 kHz
48 kHz
The Word Clock base rate can only be set in
the Pro Tools Hardware Setup.
If the EXT LED flashes on and off,
HD OMNI does not have external sync.
Check to make sure that HD OMNI is receiving synchronization from the correct
clock source.
Sample Rate LEDs
These LEDs display the current sample rate of
the HD OMNI internal crystal oscillator:
44.1 kHz, 48 kHz, 88.2 kHz, 96 kHz, 176.4 kHz,
or 192 kHz. The sample rate can be set in
Pro Tools when you create a new session, or in
the Hardware Setup (see “Pro Tools Hardware
Se tup” on p age 2 3) o r Playb ack Engine d ialogs i f
no session is open. You can also set the Sample
Rate in SETUP mode if Pro Tools is not running
(see “Internal Sample Rate (SRATE)” on
page 45).
HD OMNI Guide8
METERS
MONITOR Controls
These five-segment LEDs indicate signal level for
either the input or output channels 1–8. These
meters are calibrated at –42 dB, –18 dB, –12 dB,
–6 dB, and 0 dB, respectively. The 0 dB LED segment lights red if clipping occurs at the Input or
Output depending on whether IN or OUT is selected.
Input/Output Meters
The front panel METERS only display the
eight analog/digital Input or Output channels assigned in the Pro Tools Hardware
Setup. Unassigned channels are not displayed on the front panel METERS. The
output METERS only show signal level from
Pro Tools output channels. They do not display signal levels for direct monitoring.
IN/OUT Button Toggles whether the Meters
show the signal levels for either the Input or the
Output channels.
HD OMNI provides onboard monitoring from
mono up to 7.1 surround. Use the front panel
MONITOR controls to select the monitoring
path and adjust monitoring levels. You can configure the following monitoring options:
• Control Room Outputs (MAIN and ALT as
configured in Pro Tools)
• MUTE, ALT, and CUE to Headphones
• Headphone Output
•SETUP
Monitor controls and Headphone jack
For more information on configuring monitoring with HD OMNI in Pro Tools, see
“Monitor” on page 26.
SETUP Enables (or exits) Setup mode. The
SETUP button LED is lit when in Setup mode
(for more information about Setup mode, see
Chapter 5, “SETUP Mode”).
IN LED Indicates that the Meters are showing the
the signal levels for the Input channels assigned
in the Pro Tools Hardware Setup.
OUT LED Indicates that the Meters are showing
the signal levels for the Output channels assigned in the Pro Tools Hardware Setup.
A signal that meters at 0 on the HD OMNI
will not necessarily clip; use the on-screen
meters in Pro Tools to determine whether a
signal is clipping.
CUE Enables (or disables) a dedicated stereo Cue
mix from Pro Tools that is sent to the headphones. The CUE button LED lights when enabled. When CUE is disabled, the headphones
monitor the same mix as the Control Room outputs (see also “CUE 1–2” on page 39).
Chapter 2: HD OMNI Overview 9
ALT Toggles the Control Room output paths between MAIN and ALT. The LED is lit when the
Control Room output is assigned to ALT, and it
is off when the Control Room output is assigned
to MAIN. You can also press and hold the ALT
button to engage ALT Trim mode (see “Analog
Output Trim (OUTRIM)” on page 42).
MUTE Mutes (or unmutes) the MAIN or ALT
Control Room outputs only, whichever is active. The LED lights when MUTE is enabled.
When power cycling HD OMNI, MUTE is
temporarily engaged automatically to protect the monitor outputs for the Control
Room monitor paths declared in Pro Tools.
The MUTE button does not affect the Headphone output.
MONITOR Encoder Lets you select and adjust the
output levels for the MAIN, ALT, and headphone outputs. You can also use the Monitor
encoder to enter Trim values in ALT Trim mode
and to navigate Setup mode. Press the encoder
to switch between Control Room (CR) and
Headphone mode (HP).
In Setup mode, press the encoder to select and
confirm settings. For more information on
Setup mode, see Chapter 5, “SETUP Mode.”
HEADPHONE Jack
HD OMNI provides a single stereo 1/4-inch
headphone jack on the front panel. The output
to the headphone jack can either mirror the stereo channels of the selected Control Room monitoring path or the dedicated CUE 1–2 output
from Pro Tools (see “CUE 1–2” on page 39).
Use the MONITOR Encoder to control the Headphone level (see“MONITOR Controls” on
page 9).
The HD OMNI Headphone output also lets you
monitor greater than stereo format sessions, in
two different ways: passing the Left and Right
channels only, or folding down from the
greater-than-stereo format to stereo. For example, with a 5.1 monitor format, if fold down is
not enabled, only the Left and Right channels
will be heard in the headphones. However, with
fold down enabled, all channels will be folded
down to stereo for headphone monitoring.
You can configure multichannel monitoring
and enable (or disable) fold down or headphone
monitoring in the Pro Tools Hardware Setup dialog (for more information, see “Monitor” on
page 26).
The HD OMNI Headphone output is set to
power 600 Ohm headphones at +3 dBV.
MONITOR Display Shows which output level is
being controlled and the value for that parameter:
• “CR” = Control Room level (either MAIN or
ALT)
• “HP” = Headphone level
HD OMNI Guide10
HD OMNI Back Panel
The HD OMNI has the following back panel features:
HD OMNI Back Panel
Analog Inputs
HD OMNI provides up to four channels of simultaneous analog inputs to Pro Tools using
24-bit A/D converters that support sample rates
up to 192 kHz. Channels 1 and 2 can be from
the front panel inputs (XLR microphone or
1/4-inch TRS Instrument), from the back panel
MICROPHONE (XLR) 1 and 2 Inputs, or from
the back panel LINE IN (1/4-inch TRS) 1 and 2
Inputs. Channels 3 and 4 are always from the
back panel LINE IN 3 and 4 Inputs.
Back panel analog inputs
MICROPHONE 1 and 2 Inputs
HD OMNI provides two microphone inputs
(XLR) on the back panel. These two inputs are
routed through the preamps, which can be controlled from the front panel.
SEND and RTN 1 and 2
HD OMNI provides two discrete hardware sends
and returns. The selected inputs (MIC, LINE, or
INST) on Channels 1 and 2 can be routed
through the hardware sends and returns available on the back panel. This lets you use your favorite outboard gear (such as compressors or
EQs) at the signal input stage, after the pad, preamp, and high-pass filter, but before the Soft
Clip or Curv limiter circuits and the analog-todigital converter.
Send and Return 1 inserts on Channel 1 and
Send and Return 2 inserts on Channel 2. Select
(or deselect) INSERT on the front panel to enable (or disable) the hardware inserts. Note that
the sends are always active.
LINE IN 1–4
HD OMNI provides four line level 1/4-inch TRS
inputs. LINE IN 1 and 2 can only be used for input when the Input Type is set to LINE on the
front panel.
MICROPHONE 1 and 2 can be used for input
when the Input Type is set to MIC on the front
panel. If the Input Type is set to MIC on the
front panel, and a microphone connection is
made on the front panel Channel 1 or 2 inputs,
the corresponding back panel input is bypassed.
Chapter 2: HD OMNI Overview 11
Analog Outputs
Digital Inputs and Outputs
Back panel analog TRS outputs, and analog and digital
(AES/EBU) DB-25 outputs
TRS OUT 1 and 2
HD OMNI provides two 1/4-inch TRS Outputs
for monitoring either ANALOG OUT 1 and 2 or
ANALOG OUT 7 and 8 (or neither). This can be
set in Pro Tools on the Analog Out tab of the
Hardware Setup dialog (see “Analog Out” on
page 26) or on HD OMNI in SETUP mode (see
“TRS Output Mirrors (TRSOUT)” on page 43)
ANALOG OUT 1–8
HD OMNI provides a DB-25 connector for eight
channels of analog audio output. These balanced outputs operate at +10 dBu (Speaker level)
or at +24 dBu (Line level). You can set the output level in Pro Tools on the Analog Out page of
the Hardware Setup dialog (see “Analog Out” on
page 26).
For a pinout diagram for the analog DB-25
connector, see Appendix A, “Pinout Diagrams for the DB-25 Connectors.”
Back panel digital inputs and outputs
AES EBU OUT 1–8
HD OMNI provides one DB–25 connector for
eight channels of AES/EBU output. Each of the
paired channels is a balanced three-conductor
signal, and supports 192 kHz sample rates in
Single Wire mode.
For a pinout diagram for the AES/EBU DB25 connector, see Appendix A, “Pinout Diagrams for the DB-25 Connectors.”
AES/EBU INPUT
HD OMNI provides a single stereo AES/EBU
(XLR) input. The AES/EBU Input supports sample rates up to 192 kHz using AES Single Wire.
S/PDIF IN and OUT (Coaxial)
HD OMNI provides RCA jacks for stereo S/PDIF
digital data stream input and output. S/PDIF
supports up to 24-bit audio, at sample rates up
to 192 kHz.
To maintain data integrity and minimize
jitter, use only 75-ohm coaxial cable for
S/PDIF connections.
HD OMNI Guide12
OPTICAL IN and OUT (1 and 2)
HD OMNI provides two sets of eight-channel
Optical (TOSLINK) input and output. The Optical I/O on HD OMNI supports up to 24-bit audio, at sample rates up to 192 kHz. The number
of available Optical input and output channels
varies with sample rate as described below:
ADAT Optical
At sample rates of 44.1 kHz and 48 kHz, Optical
Port A provides eight channels of audio input
and output. Optical Port B is unused for input,
but on output it mirrors Optical Port A (channels 1–8).
and 192kHz, but sample rate conversion (SRC) is
automatically enabled for this feature. The Opti-
cal (S/PDIF) option can be selected in the
Pro Tools Hardware Setup dialog.
About Lightpipe-Compatible Devices
Lightpipe is an industry standard, eight-channel
optical digital audio connection created by Alesis. Lightpipe is found on many devices, including Optical (ADAT) decks, modular digital multitracks (MDMs), sound cards, A/D or D/A
converters, and digital mixing consoles.
DigiLink Mini Ports
S/MUX 2
At sample rates of 88.2 kHz and 96 kHz (S/MUX
2), each Optical port provides four channels of
audio. Optical In and Out 1 send and receive
channels 1–4, and Optical In and Out 2 send
and receive channels 5–8.
S/MUX 4
At sample rates of 176.4 kHz and 192 kHz
(S/MUX 4), each Optical port provides two
channels of audio. Optical In and Out 1 send
and receive channels 1 and 2, and Optical In
and Out 2 send and receive channels 3 and 4.
When using S/MUX, only the first optical
port can be used to synchronize to external
clock.
Optical (S/PDIF)
Either set of Optical I/O ports can also be used
for two-channel Optical S/PDIF input and output with support for sample rates up to 96 kHz.
HD OMNI can receive two channels of Optical
S/PDIF when operating at sample rates of 176.4
PRIMARY PORT
Use the PRIMARY PORT to connect HD OMNI to
your Pro Tools|HD system using a DigiLink Mini
to DigiLink adapter cable (included).
The PRIMARY PORT can send and receive up to
32 channels to and from a Pro Tools|HD card.
Channels 17–32 (if active) are passed through to
the EXPANSION PORT. However, note that HD
OMNI only provides up to eight channels of input and output.
When using HD OMNI in a system with multiple interfaces, it will provide eight channels of
input and output on Pro Tools channels 1–8 or
17–24 depending on whether or not HD OMNI
is connected directly to a Pro Tools|HD card, or
whether it is connected to the Expansion port of
another Pro Tools|HD peripheral (such as an
HD I/O).
Chapter 2: HD OMNI Overview 13
DigiLink Mini Cable Length Specifications
EXPANSION PORT
There are six different lengths of DigiLink Mini
cables:
•18” (0.46m), included with each interface
•12’ (3.6m)
•25’ (7.62m)
•50’ (15.25m), the maximum length sup-
ported for 192 kHz sessions (sold separately)
• 100’ (30.5m), the maximum length supported for 96 kHz sessions (sold separately)
• 200’ (61m), the maximum length supported for 48 kHz sessions (sold separately)
DigiLink to DigiLink Mini Adapter Cables
Use DigiLink to DigiLink Mini adapter cables to
connect HD OMNI to Pro Tools|HD cards. You
can also use DigiLink to DigiLink Mini adapter
cables to connect older HD peripherals (such as
192 I/O) to the EXPANSION PORT of HD OMNI.
There are two types of DigiLink to DigiLink Mini
adapter cables:
•12” (0.3 m) DigiLink female to DigiLink
Mini male, included with each interface
• 12” (0.3 m) DigiLink Mini female to DigiLink male
The EXPANSION PORT lets you connect an additional Pro Tools|HD audio interface to
HD OMNI. The EXPANSION PORT passes channels 17–32 to and from the expansion (or secondary) audio interface.
This port is only available when HD OMNI is
connected to a Pro Tools|HD card (it is not available when the HD OMNI is connected to the EXPANSION PORT on another audio interface).
Pro Tools only supports a single HD OMNI
per system. Any additional HD OMNI peripheral connected to your Pro Tools system
will not be recognized.
For more information about DigiLink Mini
and DigiLink Mini to DigiLink cables, visit
the Avid website (www.avid.com).
HD OMNI Guide14
Clock and Synchronization Ports
Back panel Word Clock and Loop Sync In and Out
WD CLK IN and OUT
The Word Clock I/O ports are standard BNC
connectors that receive and output word clock
signal. These ports can be used to synchronize
HD OMNI with any word clock-capable device.
Word Clock In can be selected as the Clock
Source from the front panel or in the Hardware
Setup dialog in Pro Tools. Word Clock Out can
be configured in the Hardware Setup dialog using the External Clock Output selector.
Because crucial timing data is passed
through the Loop Sync and Word Clock ports,
you should use high-quality, 75-ohm RG–59
cables for making connections.
LOOP SYNC In and Out
Loop Sync is a dedicated clock loop for synchronizing multiple Pro Tools|HD peripherals
together (multiple audio interfaces, and/or a
SYNC HD™ or SYNC I/O™ and one or more audio interfaces). Loop Sync uses a word clock signal based on sample rates of either 44.1 kHz or
48 kHz. As sample rate increases in the system,
Loop Sync continues to operate at a base rate of
44.1 kHz or 48 kHz, depending upon the higher
rate.
The Loop Sync In and Out ports are standard
BNC connectors that output a 1x Word clock
signal. Loop Sync should only be used to chain
multiple Pro Tools|HD peripherals together (audio interfaces and SYNC HD or SYNC I/O).
AC Power
This connector accepts a standard AC power cable (included). HD OMNI is auto power-selecting (100V to 240V) and will automatically work
with a standard modular cable (IEC) to connect
to AC power outlets in any country.
Chapter 2: HD OMNI Overview 15
HD OMNI Guide16
chapter 3
Connecting HD OMNI
Pro Tools|HD Systems
HD OMNI provides up to eight channels of analog and digital I/O with Pro Tools when connected to a Pro Tools|HD card using a DigiLink
Mini to DigiLink cable adapter or when connected to the expansion port of another
Pro Tools|HD audio interface (such as HD I/O).
You can add additional Pro Tools|HD audio interfaces to your Pro Tools|HD system using the
Expansion port on the back of HD OMNI or using additional Pro Tools|HD cards. However,
Pro Tools supports only one HD OMNI in a single Pro Tools|HD system.
For more information about installing
Pro Tools|HD cards, see the Pro Tools|HD
User
Guide.
To connect HD OMNI to a Pro Tools|HD system, do
one of the following:
Connect HD OMNI Primary Port to the Digi-
Link Port on the Pro Tools|HD Accel Core card
with a DigiLink Mini to DigiLink cable (included with your Pro Tools|HD system).
– or –
Connect HD OMNI Primary Port to the Ex-
pansion port on a primary Pro Tools|HD audio
interface with a DigiLink Mini cable (HD I/O)
or DigiLink Mini to DigiLink cable (192 I/O,
192 Digital I/O, or 96 I/O).
Pro Tools|HD audio interfaces need room at
their sides to maintain proper air flow for
cooling. Do not block the sides of the unit or
disconnect the internal fan. If the units are
rack-mounted in a case, remove the case
lids or doors before operating the system.
Failure to do so can result in the units overheating very quickly, which can permanently damage sensitive components.
If the fan stalls or fails on HD OMNI, the
Monitor LCD displays “FANerr,” and the
Monitor LCD backlighting turns red. If this
happens, try power cycling HD OMNI to restart the fan. For more information, see
“Fan Failure Mode” on page 49.
Chapter 3: Connecting HD OMNI 17
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