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Chapter 4: Connecting Your Studio 33
accommodate the different “line levels” that these devices can generate. Inputs 3–8 accept
1/4” connectors. You can also connect line-level signals to Mic/Line inputs 1 and 2 on the
front by pressing the –26 dB pad switch.
Digital Audio
Digital audio represents analog waveforms using thousands of digital samples of the analog
waveforms each second. All audio on your hard disk in a Pro Tools LE session is digital
audio.
Digi 001 provides digital inputs for ADAT and S/PDIF format digital audio.
ADAT Format
The ADAT format was developed by Alesis for use in their ADAT multitrack recorders. Each
ADAT optical connection provides 8 channels of digital audio with 24-bit capability. You
can connect an ADAT or other ADAT optical format device directly to the optical I/O on the
Digi 001 PCI Card. The optical I/O connectors accept optical cables.
S/PDIF
S/PDIF (Sony/Phillips Digital Interchange Format) I/O is available on many DAT decks,
compact disc players, and other digital devices. Each S/PDIF connection provides 2
channels of digital audio with 24-bit capability. You can connect a S/PDIF digital input to
either the Optical connectors (see Figure 1), or to the S/PDIF RCA connectors on the back
of the Digi 001 I/O Box. The optical connectors accept optical cables; the RCA connectors
accept RCA cables.
▲
Only one S/PDIF input pair can be used at a time. For example, if you use the op-
tical input for S/PDIF data, you cannot use the RCA inputs.
Analog preamp input
Figure 1. Optical I/O on the Digi 001 PCI Card
–26dB
Input gain
XLR & 1/4”
combo
phantom
power pad
connector
out in
NOTE BRIGHT
RED LIGHT