MOTU 896 User's Guide Page 35

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INSTALLING THE 896MK3 HARDWARE
35
CONNECTING MULTIPLE MOTU FIREWIRE
INTERFACES
You can daisy-chain up to four MOTU FireWire
interfaces on a single FireWire bus, with the
restrictions described in the following sections.
Most computers have only one built-in FireWire
bus (even if it supplies multiple FireWire sockets).
Connect them as follows:
Figure 4-21: Connecting multiple 896mk3’s (or other MOTU FireWire
audio interfaces) to a computer.
Multiple interfaces cannot be bus-powered
Do not run the Traveler, UltraLite or other bus-
powered interfaces under bus power when
connecting them with other devices on the same
FireWire bus.
Multiple interfaces in MOTU Audio Setup
MOTU Audio Setup displays the settings for one
interface at a time. To view the settings for an
interface, click its tab as shown below in
Figure 4-22.
Figure 4-22: To view the settings for an interface, click its tab.
Synchronizing multiple interfaces
Mac OS X provides an advanced, flexible driver
model that allows multiple Core Audio drivers to
be active at one time, accessed by multiple
applications simultaneously. For example, you can
run both FireWire and PCI audio interfaces at the
same time, accessing all of their inputs and outputs
from your host audio application — or even
multiple applications simultaneously. You can
take advantage of Mac OS Xs aggregate device
driver feature, which allows you to create a unified
meta device out of several different audio
interfaces. The aggregate device presents to your
host software all of the inputs and outputs of the
included devices.
An important feature of this flexible model is that
multiple devices must be synchronized to one
another in order to remain resolved to each other.
Without synchronization, the audio streams going
to each interface might drift with respect to one
another. For example, the audio tracks playing
back through the 896mk3 might drift out of sync
with the audio tracks playing back through your
2408mk3 PCI interface. Synchronizing them to
FireWire
FireWire
FireWire
FireWire
FireWire
FireWire
FireWire
FireWire
Mac
Word Clock Out
Word Clock In
Word Clock Out
Word Clock In
Word Clock Out
Word Clock In
For two
interfaces,
slave one to
the other.
You can probably
get away with
daisy-chaining
three interfaces,
although a word
clock distribu-
tion device is
recommended.
This is risky. A
word clock distri-
bution device is
highly recom-
mended.
896mk3 Hybrid book Page 35 Friday, August 19, 2011 1:44 PM
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