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When using a SYNC I/O with a Big Ben, we find it best to make the SYNC I/O the master and have the Big Ben lock to it. The Big Ben can then send its superior clock out to all of your audio interfaces. In the example below we are using 192’s. However the setup would be the same if you were using AD and DA-16X’s or Rosetta’s connected via the X-HD option card. The only difference would be that the set up in Pro Tools is a bit simpler, as explained on the next page of this document.

1) Connect a 75 ohm BNC cable from Word Clock out of the Sync I/O to the Word Clock In of the Big Ben

2) Connect a 75 ohm BNC cable between the WC Out connections of Big Ben and the EXT In of each audio interface.

3) Do NOT connect the LOOP Sync connections between the audio interfaces or to the SYNC I/O. To best take advantage of Big Ben’s superior clock, each interface must be connected directly to a Big Ben word clock output.

Pro Tools Software Configuration

1) In Pro Tools under “Set Up”> “Session”>”Clock Source”> “192 I/O #1, choose “Word Clock” You will get a message that says “The Sync I/O clock reference is not locked” Click on the OK button.

3) Next, under “Clock Source” you will select “Sync I/O”

4) You should now see a message that says “The Sync I/O clock reference is now locked”

If you are using Apogee converters (AD/DA-16X’s or Rosetta’s via the X-HD card) and you are not using 192’s at all, you will not have to do the following previous 4 steps. The Apogee units will automatically lock to external W/C when the Sync I/O is set to master.