Setup Guide

Chapter 9: 003 Rack+ Back Panel 69
chapter 9
003 Rack+ Back Panel
The 003 Rack+ back panel includes audio, MIDI
and computer connectors for the unit (see
Figure 5 on page 70) The functions of each con-
nector and their associated switches are ex-
plained in this section.
Operating Levels and Headroom
All 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 clipping oc-
curs.
The maximum input and output of the
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 the 003 Rack+ analog inputs 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
the 003 Rack+ support up to 24-bit resolution
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 the
003 Rack+.