MOTU 828mkII User's Guide download pdf (Page 31)

INSTALLING THE 828MKII HARDWARE

SYNCING WORD CLOCK DEVICES

The 828mkII word clock connectors allow you to

synchronize it with a wide variety of other word

clock-equipped devices.

For standard word clock sync, you need to choose

an audio clock master (as explained in “Be sure to

choose a digital audio clock master” on page 22).

In the simplest case, you have two devices and one

is the word clock master and the other is the slave

as shown below in Figure 3-18 and Figure 3-19.

Figure 3-18: Slaving another digital audio device to the 828mkII via

word clock. For the 828mkII clock source, choose any source besides

word clock, as it is not advisable to chain word clock.

Figure 3-19: Slaving the 828mkII to word clock. For the 828mkII clock

source, choose ‘Word Clock In’.

Don’t chain word clock

If you have three or more digital audio devices that

you need to synchronize, avoid chaining their word

clock connections (OUT to IN, OUT to IN, etc.), as

this causes problems. Instead, use a dedicated

synchronizer like the Digital Timepiece or a word

clock distribution device of some kind.

Slaving to 2x and 1/2x word clock

All MOTU FireWire audio interfaces that support

96 kHz operation (including the 828mkII and 896)

have the ability to slave to a word clock signal

running at either twice or half their current clock

rate. For example, the 828mkII could be running at

96 kHz while slaving to a 48 kHz word clock signal

from a MOTU Digital Timepiece. Similarly, the

828mkII could run at 88.2 kHz and slave to

44.1 kHz word clock. Conversely, the 828mkII

could run at 48 kHz and slave to a 96 kHz word

clock signal. In all of these cases, the front panel

clock LEDs ﬂash both sample rates to indicate that

the 828mkII is slaving to word clock at either twice

or half its own clock rate. But if the 828mkII is

running at 96 kHz, it cannot slave to word clock

running at 44.1 kHz.

Remember, the word clock signal must be one of

the following:

■ the same as the 828mkII clock

■ twice the 828mkII clock

■ half of the 828mkII clock

SYNCING LARGE SYSTEMS

If you are connecting the 828mkII to a lot of other

digital audio gear, get a Digital Timepiece. It can

synchronize a wide variety of devices, and it offers

sample accurate synchronization for devices that

support it, such as ADATs. You will also be able to

control everything from the transport controls of

your audio software. If you have even more devices

than a single Digital Timepiece can support,

consider a word clock distribution device, such as

the Aardvark Aard Sync™ video-to-word clock

converter. Products like this offer multiple word

clock outputs and an extremely low-jitter clock.

Master

Slave

Word clock OUT

Word clock IN

Other device

828mkII

Audio

clock

Master

Slave

MOTU Digital Timepiece universal synchronizer

Word clock OUT

Word clock IN

828mkII

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MOTU 828mkII User's Guide Page 31

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