MOTU 896HD User's Guide download pdf (Page 32)

INSTALLING THE 896HD HARDWARE

Make the Clock Source settings for each interface

as follows:

■ For the master interface, click its tab (as

demonstrated in Figure 3-25) and choose any

clock source you wish (except any of the slave

interfaces, of course).

■ For each slave interface, click its tab and choose

the master interface from the Clock Source menu.

This causes the slave interfaces to resolve to the

master interface.

Using multiple interfaces under Mac OS 9

All connected MOTU FireWire interfaces get their

clock from whatever you choose from the Clock

Source menu in the MOTU FireWire Audio

Console. When you connect multiple MOTU

FireWire interfaces, all of their respective sync

sources are displayed in the menu as shown below

in Figure 3-26.

Figure 3-26: In Mac OS 9, all MOTU FireWire audio interfaces get their

clock from a single master sync source on any connected 896HD (or

other MOTU FireWire interface). After you choose a source from this

menu, the entire system, including all connected 896HDs, synchro-

nizes to it.

Under Mac OS 9, each FireWire interface in the

system gets its clock from the FireWire cable

connection (unless it is the master clock itself).

There is no need to make word clock connections

between multiple FireWire interfaces.

Connecting an 828

Yo u c a n a d d a n or i g i n a l M OTU 828 to the end of a

FireWire daisy chain (because the 828 has only one

FireWire port), or you can mix and match multiple

828’s with other MOTU FireWire interfaces using a

standard FireWire hub. Up to four interfaces can be

combined on one FireWire bus.

Operating multiple FireWire interfaces at high

sample rates

Four MOTU FireWire interfaces can operate at

44.1 or 48kHz on a single FireWire bus. At the high

samples rates (88.2 or 96kHz), you can operate no

more than two FireWire interfaces on a single

FireWire bus.

Adding additional interfaces with a second

FireWire bus

Third-party FireWire bus expansion products in

the form of a cardbus (“PC card”) adaptor or PCI

card allow you to add a second FireWire bus to

your computer. It may be possible to add additional

MOTU FireWire interfaces connected to such a

third-party product, depending on the

performance of the product and the performance

of your host computer.

Managing the IDs of multiple interfaces (Mac

OS 9 only)

Multiple 896HD interfaces are identiﬁed by

number (#1, #2, #3, etc.) Interfaces are ID’d (given

a number) by the order in which they are ﬁrst

powered up after being connected. This

information is stored in the MOTU FireWire Audio

preferences ﬁle. Once ID’d, they retain the same

number regardless of the order in which they are

powered up. You can disable an interface at any

time with the Disable interface option shown in

Figure 3-25 on page 31. Doing so frees up the

FireWire bandwidth required by the interface

without turning it off. Switching off an interface

accomplishes the same thing. To get the MOTU

FireWire Audio Control Panel Console to forget

about an interface entirely, you’ll see a Forget

button in the MOTU FireWire Audio Console. Just

click the Forget button and the MOTU FireWire

Audio Console will no longer consider the

interface to be present but off line (turned off).

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MOTU 896HD User's Guide Page 32

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