Pro Tools | HD I/O Guide42
For example, to have 12 dB of headroom above
0 VU with the HD I/O, you must align the incom-
ing 0 VU 1kHz tone to a level of –12 dBFS. For
18 dB of headroom, you would align it to
–18 dBFS. (Since it is assumed that you are using
the HD I/O with a +4 dBu device or console, a
0 VU signal level coming out of the device or con-
sole is actually equivalent to a nominal +4 dBu
level signal.)
Calibrating the HD I/O
To calibrate your HD I/O, use one of the HD I/O
calibration sessions included with Pro Tools (lo-
cated in the Pro Tools Utilities/Calibration Mode
Session/HD IO Calibration Session folder). You
can use these sessions as is and change the input
and output assignments for more HD I/O channels
or use it as a template to make your own calibration
session.
The following instructions show how to create a
calibration session from scratch.
To create a session for calibrating your HD I/O:
1
Launch Pro Tools and create a new session.
2
Choose
Setup > Preferences
and click the
Op-
eration
tab.
3
Enter the desired Calibration Reference Level
value in dB. A level of –18 dB is typical. (It is
not necessary to type a minus sign here.)
4
Click
OK
.
5
Create a new mono audio track by choosing
Track > New
.
6
Insert the Signal Generator plug-in on the track.
7
Set the Signal Generator plug-in output level.
This should be the same value you entered as
the Calibration Reference Level (such as
–18 dB).
8
Set the Signal Generator frequency to 1000 Hz.
1000 Hz is typical, but any frequency will work.
Other typical values are 250 Hz and 500 Hz.
9
Set the Signal Generator signal waveform to
Sine.
10
Route the track’s output to Bus 1. In the calibra-
tion template, Bus 1 has been renamed to “1k
Tone.”
11
Create a mono Auxiliary Input track for each
HD I/O output you want to calibrate. Set the
output assignment for each of these Auxiliary
Inputs to its respective I/O output.
12
Set the input of each Auxiliary Input track to
Bus 1, or 1k Tone for the template session.
If your system includes one or more EUCON
controllers, be sure to disable “Auto-bank to
selected track” in EuControl software before
enabling Pro Tools Calibration Mode to en-
sure that faders remain silent. To make sure
“Auto-bank to select track” is not enabled,
open the EuControl Settings window, click to
go to the General tab, and verify the setting is
not enabled. If necessary, click to disable
“Auto-bank to selected track.” After exiting
Calibration Mode, be sure to re-enable the
“Auto-bank to selected track” setting (if nec-
essary).
Turn down your monitoring system before
beginning calibration. The Signal Generator
plug-in emits a continuous signal when in-
serted on a track.
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