Specifications

HD I/O Guide22
Analog In Page
The Analog In page of the Hardware Setup dia-
log lets you set the Reference Level for the phys-
ical analog inputs on HD I/O. You can also apply
a limiter to each of the available analog inputs.
If you have only a single HD I/O AD Expansion
card installed, a single Analog In tab is available.
If you have two HD I/O AD Expansion cards in-
stalled, the tabs Analog 1–8 and Analog 9–16 are
available. The Analog In, and Analog 1–8 and Ana-
log 9–16 pages provide the same controls for the
corresponding physical inputs on the HD I/O
AD card. If no HD I/O AD Expansion card is in-
stalled, these tabs are not available.
Reference Level
Select the appropriate Reference Level for each of
the available analog input channels. This lets
you select the analog audio input source on a
channel-by-channel basis. The +4 dBu option
routes audio from the physical +4 dBu Balanced
DB-25 Analog Input port on the card. The
–10 dBV option routes audio from the physical
–10 dBV Balanced DB-25 Analog Input port on
the card.
Limiter
HD I/O provides options for soft limiting on
each of the available analog input channels. Se-
lect the desired option from the corresponding
Limiter pop-up menu:
None Applies no limiting to the incoming ana-
log signal.
Soft Clip Attenuates the incoming analog signal,
providing extra protection from temporary clip-
ping transients that can cause digital distortion
when they exceed the maximum input of the
unit. With Soft Clip enabled, HD I/O supports
an additional 4 dB of headroom by rounding off
the top 4 dB to the clip point. This is useful for
eliminating stray transients or for emulating an-
alog tape saturation.
Curv Attenuates the incoming analog signal us-
ing a soft knee limiter circuit. This guarantees
super soft limiting without becoming hard, even
with large overloads on input.
88.2 kHz Word Clock
(88.2 kHz)
Word Clock
(44.1 kHz)
96 kHz Word Clock
(96 kHz)
Word Clock
(48 kHz)
176.4 kHz Word Clock
(176.4 kHz)
Word Clock
(44.1 kHz)
192 kHz Word Clock
(192 kHz)
Word Clock
(48 kHz)
Hardware Setup, Analog In page
Ext. Clock Output options by sample rate
Sample Rate
Available Ext.
Clock Default
Available Ext.
Clock Option
+4 dBu and –10 dBV DB-25 Analog Input ports