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HARDWARE INSTALLATION
42
Figure 4-12: Routing streams from your MOTU interface to the Mac.
☛ Leave Media Clock Input Stream set to None.
(This setting can be used to sync the Mac to certain
3rd-party AVB devices that support Media Clock.
This setting is not needed for MOTU devices.)
Clocking
In the example in Figure 4-12, the 1248 is the clock
master and the Mac is clocking to the 1248’s
Output Stream 1. You can also reverse this
scenario, where the Mac becomes the master and
the 1248 clocks to Mac’s Output Stream 1. The Mac
does not follow the web app’s Become Clock Master
button, so you must set the Mac’s Clock Mode
manually.
AVB stream and channel counts
Each MOTU AVB stream is a group of eight audio
channels. While testing is on-going, OS X AVB
performance varies with different Mac models.
Models such as the Mac Pro (late 2013) are able to
handle eight streams (64 channels) in and out
simultaneously, for MOTU interface models that
support eight streams. (Check motu.com/avb for a
summary of supported stream counts for each
MOTU interface model.) For older Macs, we
recommend one or two streams in each direction.
Generally speaking, it is best to enable only as
many streams as you need.
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