Specifications

Chapter 4: Configuring HD I/O in Pro Tools 23
Input
Select the corresponding physical input pairs
from the Input pop-up menu for each stereo pair
of Pro Tools Input channels (1–2, 3–4,
...15–16). Which physical inputs are available
depends on the sample rate and on which HD
I/O Expansion cards you have installed (for ex-
ample, if no HD I/O AD card is installed, no an-
alog inputs will be available).
Output
Select the corresponding physical outputs from
the Output pop-up menu for each stereo pair of
Pro Tools Output channels (1–2, 3–4, ...15–16).
Which physical outputs are available depends
on the sample rate and on which HD I/O Expan-
sion cards you have installed (for example, if no
HD I/O DA card is installed, no analog outputs
will be available). Note that these settings are
saved with the system, not with the session.
Inputs and Outputs of Similar Formats
Inputs and outputs of similar formats are differ-
entiated in the input and output channel pop-up
menus. For example, the AES/EBU inputs and
outputs in the HD I/O enclosure are listed as
AES/EBU [Encl], while the AES/EBU inputs and
outputs on a HD I/O Digital card are listed (in
pairs) as
AES/EBU 1–2, AES/EBU 3–4, AES/EBU
5–6,
and AES/EBU 7–8. For HD I/Os equipped
with an second Digital card, the additional
AES/EBU I/O ports on the optional card are
listed as
AES/EBU 9–10, AES/EBU 11–12,
AES/EBU 13–14,
and AES/EBU 15–16.
Digital Format
Select from the following digital input formats
for the built-in digital I/O enclosure (configure
the options for any additional HD I/O Digital
cards by clicking the corresponding
Digital tab):
AES/EBU Provides up to two channels of
AES/EBU input.
S/PDIF Two channels of S/PDIF (coaxial) input.
Optical (S/PDIF) Two channels of S/PDIF (opti-
cal) input up to 96 kHz. This option is not avail-
able at sample rates higher than 96 kHz.
S/PDIF Format
For S/PDIF (Sony/Phillips Digital Interface For-
mat) compatibility with Tascam DA-30 DAT re-
corders, select the
Tascam option under S/PDIF
Format.
Ext. Clock Output
If you want to send clock output to other devices
attached to HD I/O, select the appropriate out-
put from the
Ext. Clock Output pop-up menu.
The available options for
Ext. Clock Output
change depending on the session sample rate.
See the table below for a list of default external
clock settings and available options.
These settings are saved with the system, not
with the session.
Control-click (Mac) or Start-click (Win-
dows) to select multiple Inputs or Outputs.
Command-Option-click (Mac) or Control-
Alt-click to cascade all Input or Output
settings.
Ext. Clock Output options by sample rate
Sample Rate
Available Ext.
Clock Default
Available Ext.
Clock Option
44.1 kHz Word Clock
(44.1 kHz)
N/A
48 kHz Word Clock
(48 kHz)
N/A