828Mkii Settings; Sample Rate; Clock Source - MOTU 828mkII User Manual

It doesn't matter which way you access the 828mkII
settings. They are the same in all three places.

828MKII SETTINGS

Figure 6-1: The MOTU FireWire Control Panel gives you access to all of
the settings in the 828mkII hardware.

Sample Rate

Choose the desired Sample Rate for recording and
playback. The 828mkII can operate at 44.1 (the
standard rate for compact disc audio), 48, 88.2 or
96KHz. Make absolutely sure that all of the devices
connected digitally to the 828mkII match the
828mkII's sample rate. Also make sure that your
Digital Timepiece, MIDI Timepiece AV or other
digital audio synchronizer matches it as well.
☛
Mismatched sample rates cause distortion and
crackling. If you hear this sort of thing, check the
sample rate settings in your hardware and here in
the MOTU FireWire Audio Console.

Clock Source

The Clock Source determines the digital audio
clock that the 828mkII will use as its time base. For
a complete explanation of synchronization issues,
48
see "Making sync connections" on page 22. The
following sections briefly discuss each clock source
setting.
Internal
Use the Internal setting when you want the
828mkII 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 828mkII system on its internal
clock, and then slave the DAT deck to the 828mkII
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).
If you would like help determining if this is the
proper clock setting for your situation, see "Do you
need a synchronizer?" on page 23.
With ADAT devices, however, you usually want an
external digital audio synchronizer, such as the
MIDI Timepiece AV or Digital Timepiece, to be the
digital clock master. In this case, you would set the
828mkII clock source setting to ADAT 9-pin, as
described below.
S/PDIF
The S/PDIF clock source setting refers to the
S/PDIF RCA input jack on the 828mkII. This
setting allows the 828mkII 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
828mkII. It is not necessary in the opposite
direction (when you are transferring from the
828mkII to the DAT machine).
M O T U F I R E W I R E C O N T R O L P A N E L ( M A C O S 9 )