User`s guide

Symphony Mobile – User’s Guide
9
Clocking Apogee Interfaces
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
rst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 rst 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rst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gure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rst
interface to Internal. All remaining interfaces
should switch to their external word clock
source.
3 When opening CoreAudio applications, the
rstinterfaceshouldswitchtothesame
sample rate as the session you’re opening,
and all remaining interfaces should follow.
FigureA.OptimumclockingcongurationusingBIGBEN
Big Ben
Interface 1
Interface 2
Interface 3
Interface 4
FigureB.Correctclockingcongurationtothemasterdevice’s
clock output using BNC “T“ connectors
Interface 1
Interface 2
Interface 3
Interface 4