MOTU 828x 28x30 Audio Interface with ThunderTechnology - Manual (Page 39)

M O T U A U D I O C O N S O L E
39
Internal
Use the Internal setting when you want the 828x to
operate under its own digital audio clock. For
example, you may be in a situation where all you
are doing is playing tracks off hard disk in your
digital audio software on the computer. In a
situation like this, you most often don’t need to
reference an external clock of any kind.
Another example is transferring a mix to DAT. You
can operate the 828x system on its internal clock,
and then slave the DAT deck to the 828x via the S/
PDIF connection (usually DAT decks slave to their
S/DIF input when you choose the S/PDIF input as
their record source) or via the 828x’s word clock
output (if your DAT deck has a word clock input).
If you would like help determining if this is the
proper clock setting for your situation, see
“Making sync connections” on page 30.
Word Clock In
The Word Clock In setting refers to the Word Clock
In BNC connector on the 828x rear panel.
Choosing this setting allows the 828x to slave to an
external word clock source, such as the word clock
output from a digital mixer.
S/PDIF
The S/PDIF clock source setting refers to the
S/PDIF RCA input jack on the 828x. This setting
allows the 828x to slave to another S/PDIF device.
Use this setting whenever you are recording input
from a DAT deck or other S/PDIF device into the
828x. It is not necessary in the opposite direction
(when you are transferring from the 828x to the
DAT machine).
For further details about this setting, see “Syncing
S/PDIF devices” on page 32.
ADAT Optical A / B
The ADAT optical clock source settings ( ADAT
Optical A and ADAT Optical B ) refer to the clock
provided by the 828x’s two optical inputs, when
either one is connected to another optical device.
These two settings only appear in the Master Clock
Source menu when their corresponding optical
bank input is enabled and set to the
ADAT Optical
format, as explained in “Optical input/output” on
page 41.
This setting can be used to resolve the 828x directly
to the optical input connection. Most of the time,
you can set up a better operating scenario that uses
one of the other synchronization options.
However, there may be occasions when you have an
optical device that has no way of synchronizing
digitally to the 828x or an external synchronizer. In
this case, the
ADAT Optical clock source setting lets
you slave the 828x to the device itself via its digital
input to the 828x.
This setting is also useful if you just need to make a
simple, click-free digital transfer between the 828x
and another device — where a time code reference
and shared transport control are not needed —
without having to set up an elaborate synchroni-
zation scenario.
For further details, see “Choosing a clock source
for optical connections” on page 26.
TOSLink A / B
The TOSLink clock source settings ( TOSLink A and
TOSLink B ) refer to the clock provided by the
828x’s two optical inputs, when either one is
connected to another optical device. These two
settings only appear in the Master Clock Source
menu when their corresponding optical bank input
is enabled and set to the
TOSLink format, as
explained in “Optical input/output” on page 41.