MOTU HD Express User Manual page 19

CONNECT AUDIO INPUTS AND OUTPUTS
The HD Express provides the following audio
input and output:
Audio format
96 kHz RCA analog
96 kHz S/PDIF digital
96 kHz embedded HDMI*
*HDMI audio is stereo at sample rates above 48kHz when playing or
capturing SD video.
All twelve audio inputs are always active. For audio
output, the HD Express provides two 8-channel
banks (1-8 and 9-16). Both 8-channel output
banks can be enabled at the same time, for a total of
sixteen channels of simultaneous audio output. You
can freely assign the 8-channel analog output,
8-channel HDMI output, and stereo S/PDIF
output to either bank, as desired, for a total of
sixteen channels of simultaneous audio output.
Analog audio outputs
Figure 3-5: The HD Express audio connectors.
I N S T A L L I N G T H E H D E X P R E S S H A R D W A R E
Input Output
channels channels
2 8
2 2
8 8
Stereo RCA 8-channel HDMI
analog in embedded in
Stereo S/PDIF I/O
Analog audio I/O
The analog inputs are equipped with digitally
controlled analog trims that provide +18 dB of gain
and -10 dB of cut. To adjust these trims, see
"Analog input trims" on page 31.
The eight RCA analog outputs (Figure 3-5) can be
connected directly to powered speakers, a mixer or
any other analog audio destination.
Stereo S/PDIF digital I/O
The stereo RCA S/PDIF input and output jacks
provide digital audio input and output. Be sure to
use digital audio-grade RCA cables.
Sample rate conversion (SRC)
The stereo S/PDIF input on the HD Express is
sample-rate converted, so you do not need to
worry about digital audio clocking issues when
using it. Simply set the HD Express clock source as
desired (see "Capture Clock Source" on page 27),
and any digital audio transfers will be clean and
trouble-free.
Headphones
8-channel HDMI
embedded out
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