User Manual

HARDWARE INSTALLATION
47
Analog trims
All analog inputs and outputs can be trimmed.
This allows them to support a variety of standards,
including EBU-R68, SMPTE RP-155, +4dBu, -
10dBV, 2vRMS, 1vRMS.
The 8pre-es quarter-inch analog inputs are
equipped with high-quality, digitally controlled
analog trim that provides a range from -96 to +22
dB in 1dB steps.
Quarter-inch outputs can be trimmed in the DAC
itself. Range is 24 dB.
The Phones provide full trim range from 0 dB to
-∞ (-127).
Trim controls are most easily accessed in the web
app. See “Device tab” on page 12. Trim settings
can also be accessed in the LCD menu.
Monitor A-B outputs
From the factory, Analog Out 1-2 are assigned as
monitor pair A (Figure 5-14). If you have a
secondary pair of studio monitors, connect them
to Analog Out 3-4 (or any other desired output
pair). Then, visit the A-B Monitor Setup section in
the web app Device tab (item #29 on page 13) to
assign your chosen outputs to monitor pair B. For
more information, see “Monitor controls” on
page 63.
Optical I/O
Your MOTU audio interface provides two banks
of ADAT optical (“lightpipe”) connectors. Each
bank provides an input and output connector.
Together, they provide 16 channels of ADAT
optical digital I/O at 44.1 or 48 kHz, or 8 channels
at 88.2 or 96 kHz. The optical ports are disabled
when the interface is operating at a 176.4 or 192
kHz. At the high sample rates (88.2 or 96 kHz),
4-channel SMUX operation supports two modes
(item #22 on page 13):
■ Standard — for 2x optical connection to
3rd-party SMUX-compatible hardware products.
■ Type II (Legacy) — for 2x optical connection to
legacy MOTU products that are equipped with
optical ports and support 2x operation.
The optical ports are disabled when the interface
is operating at a 176.4 or 192 kHz.
TOSLink (optical S/PDIF)
Alternately, the Bank A optical ports can be
configured for stereo TOSLink (optical S/PDIF) in
the web app (item #22 on page 13). The optical IN
and OUT banks can be configured independently.
Choosing a clock source for optical connections
When connecting an optical device, make sure
that its digital audio clock is phase-locked (in sync
with) your MOTU interface, as explained in
“Synchronization” on page 48 and “Syncing
optical devices” on page 48.
Monitor
pair B
Figure 5-14: 8pre-es back panel
Monitor
pair A