User Manual

Chapter 8: 003 and 003 Rack Back Panels 55
chapter 8
003 and 003 Rack Back Panels
The 003 and 003 Rack back panels include au-
dio, MIDI and computer connectors for the unit
(see See Figure 3 on page 56). The functions of
each connector and their associated switches are
explained in this section.
The 003 and 003 Rack have identical connec-
tors. The 003’s Power switch is on its back panel,
whereas the 003 Rack’s Power switch is on its
front panel.
Operating Levels and Headroom
All 003 and 003 Rack audio inputs and outputs
are set for 14 dB of headroom below 0 dB, or full
code. This means at the nominal reference input
level (+4 dBu or –10 dBV) you can have up to
14 dB of headroom before input or output clip-
ping occurs.
The maximum input and output of 003 or
003 Rack using balanced TRS cables on any of
the +4 dBu, 1/4-inch connectors is +18 dBu
(6.15 Vrms).
Sample Rate and Resolution
Support
The Analog-to-Digital and Digital-to-Analog
converters on all 003 and 003 Rack analog in-
puts and outputs, as well as the S/PDIF Digital
I/O ports, support sample rates of 44.1, 48, 88.2,
and 96 kHz. The Optical port can be set for eight
channels of ADAT Optical I/O (supporting up to
48 kHz) or two channels of S/PDIF Optical I/O.
All the analog and digital inputs and outputs on
003 and 003 Rack support up to 24-bit resolu-
tion audio.
Digidesign does not recommend the use of
unbalanced cables. Unbalanced connec-
tions may introduce noise into your audio
system. Whenever possible, use balanced
cables to make connections to 003 and
003 Rack.