MOTU 896HD User's Guide download pdf (Page 27)

INSTALLING THE MOTU 896 HARDWARE

SYNCING OPTICAL DEVICES

The word optical is our short-hand way of referring

to any device that connects to the MOTU 896 via

an optical cable. But we make a further distinction:

an optical device is also one that doesn’t care about

sample location. An example is a digital mixer.

Since a digital mixer is not a recording device, it has

no sense of sample location like an ADAT does. An

ADAT can cue to a speciﬁc sample number (e.g.

sample number 43,478, 103) — as can any device

that supports ADAT sync, but most digital mixers

simply mix and process audio digitally, with no

sense of a speciﬁc sample location. There are many

other devices that fall into this category, including

digital effects processors, synthesizers, A/D

converters, and many more.

For ADATs or other devices that support ADAT

sync, synchronize them with the MOTU 896 as

described in the previous sections of this chapter.

For optical devices, such as digital mixers, all you

have to do is make sure that their digital audio

clock is phase-locked (in sync with) the MOTU

896. There are three ways to do this:

■ Slave the optical device to the MOTU 896

■ Slave the MOTU 896 to the optical device

■ Slave both the optical device and the MOTU 896

to a third master clock (such as a Digital Timepiece

or MIDI Timepiece AV synchronizer)

ADAT Optical IN

ADAT Optical OUT

Digital mixer

or other optical

device

MOTU 896

Clock Source setting = Internal,

or any clock source setting except

ADAT Optical. The optical device

slaves to the MOTU 896 (via its

optical cable connection).

Digital mixer

or other optical

device

ADAT Optical IN

ADAT Optical OUT

MOTU 896

With this setup, in the MOTU

FireWire Audio Console, be sure

optical input is enabled and then

choose the ADAT Optical clock

source setting. The MOTU 896

slaves to the optical device via

their optical cable connection.

Figure 4-12: Three setups for synchronizing an optical device with the MOTU 896. You can slave the optical device to the MOTU 896 or vice

versa with their optical connections. For more elaborate setups, you can slave both to a digital audio synchronizer like the Digital Timepiece.

Don’t use any of these setups for an ADAT or other optical device that records. Instead, see “Sample-accurate sync with ADATs” on page 24.

Word Clock Out

MIDI Timepiece AV

set to Internal

ADAT Sync out

ADAT sync in

Digital mixer

or other optical

device

Word Clock IN

Computer with MOTU 896

bi-directional

optical

MOTU 896

Clock Source setting = ADAT

optical

MOTU 896

Clock Source setting =

ADAT 9-pin

!896 Manual/Win Page 27 Tuesday, November 27, 2001 5:02 PM

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MOTU 896HD User's Guide Page 27

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