Using A Master Clock (Such As Apogee's Big Ben); Clocking To The First Interface - Apogee Symphony Mobile User Manual

Clocking Apogee Interfaces

Using a Master Clock (such as Apogee's Big Ben)

1 Connect a word clock cable between
outputs of the master clock and each
interface's word clock input, and terminate
the input with a 75 ohm load.
2 Boot your Mac, open the Maestro app,
and set Clock Source Select for the
first interface to External. All remaining
interfaces should switch to their external
word clock source.
3 If interfaces aren't displayed in Maestro,
select Tools > Reset Symphony
Clocking and click on External Clock.
4 When opening CoreAudio applications,
ensure that the master clock is running
at the same sample rate as the session
you're opening.

Clocking to the first interface

1 Install BNC "T connectors on the word
clock inputs of the second, third and
fourth interfaces (if present). Connect a
word clock cable from the first interface's
word clock output to the BNC "T"
connector on the next interface, from that
interface to the next, until all the word
clock inputs have been chained together,
as shown in figure B. Terminate the word
clock input of the last interface with a 75
ohm load.
2 Boot your Mac, open the Maestro app,
and set Clock Source Select for the first
interface to Internal. All remaining interfaces
should switch to their external word clock
source.
3 When opening CoreAudio applications, the
first interface should switch to the same
sample rate as the session you're opening,
and all remaining interfaces should follow.
Symphony Mobile – User's Guide
Big Ben
Interface 1
Interface 2
Interface 3
Interface 4
Figure A. Optimum clocking configuration using BIG BEN
Interface 1
Interface 2
Interface 3
Interface 4
Figure B. Correct clocking configuration to the master device's
clock output using BNC "T" connectors
Clocking Apogee Interfaces
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