Chapter 7: HD I/O Calibration Mode Instructions 43
13
Create an additional mono Auxiliary Input track
for each input you want to calibrate. Set the in-
put assignment for each of these Auxiliary In-
puts to its respective I/O input. Then set the
output of each of these Auxiliary Inputs to an
unused bus pair (for example Bus 3–4). In the
template session the bus names are Null and
Out. This makes sure feedback doesn’t occur
when monitoring main outputs 1–2.
14
Connect an external VU meter to each of the I/O
outputs in turn. (One at a time as you calibrate.)
15
Set all Pro Tools track faders to their default of
0 dB by Option-clicking (Mac) or Alt-clicking
(Windows) any fader.
16
Adjust the I/O output level trim pot with a
small, flat-head screwdriver to align the outputs
to read “0 VU” on the external VU meter. We
recommend using a tweaker tool with a re-
cessed flat-head surrounded by a plastic tube to
hold the trim pot. Tweakers can usually be
found at electronic supply stores.
To calibrate the HD I/O inputs:
1
Connect the HD I/O outputs to a bank of
HD I/O inputs by doing either of the following:
• Use a DB-25 to DB-25 straight through cable.
• Interconnect the XLR ends of DB-25-to-XLR
together.
2
In Pro Tools, select
Options > Calibration Mode
.
The names of all uncalibrated tracks begin to flash.
In addition, the track volume indicator of each
Auxiliary Input track receiving an external input
signal now displays the reference level coming
from the calibrated output (default is –18 dB).
3
Adjust the HD I/O input level trim pots with the
same small flat-head screwdriver or tweaker. It
is best to calibrate the inputs with the back of
the HD I/O facing you and the Pro Tools screen
well in sight. If you cannot see the Pro Tools
screen, consider asking another person to assist
you with the input calibration. When the level is
properly matched, the track name will stop
flashing and the peak volume indicator will in-
dicate your headroom value (the default is
“–18.0”).
The Automatch indicator arrows on each track
show the direction of adjustment required for
alignment:
• When the incoming level is higher than the
reference level, the down arrow will appear
lit (blue). In this case, trim the I/O input level
down.
• When the incoming level is lower than the
reference level the up arrow will appear lit
(red). In this case, trim the I/O input level up.
When you have properly aligned the incoming
peak signal levels to match the calibration refer-
ence level, both Automatch indicator arrows will
light: the up arrow red and the down arrow blue.
Above the fader is a peak volume indicator. This
indicator will show the dB level above and below
your chosen headroom value. If the peak indicator
is showing –19.1, you are –1.1 dB below a head-
room value of –18 dB. If the display is showing
–16.5, you are +1.5 dB above your headroom value
of –18 dB.
4
When you have finished, deselect
Options >
Calibration Mode
.
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