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Old 6th December 2016
Lives for gear
JayTee4303's Avatar
Originally Posted by msmucr View Post
You have to use first Profire unit as a primary interface, which will be connected via Firewire to your Mac.
Second (expansion) unit will operate in standalone mode (without Firewire connection) and will be connected to the primary via ADAT I/Os.

To do that, you'll to setup the expansion unit first. This is one time operation. Disconnect primary unit from the computer and connect just this expansion one.
Open ProFire Control panel and look to settings tab, there is a section for standalone mode settings. There you can set its operating mode to A/D – D/A, set its sync source to ADAT (so it will then take synchronization from first unit) and finally set mode for optical port B to ADAT.
If you then power-off and disconnect this expansion unit from computer, those settings will be remembered and the unit will be working as a standalone converter/preamp with ADAT I/O.

Then connect optical cables between primary and secondary unit.. two will be enough for working in rates <48k and four will be necessary to use for full channel count using S/MUX at higher rates (each cable will carry 4 channels at 88.2/96k.. you'll need 8 in and 8 out, that's why you'll need 4 cables).

Finally connect the primary unit to the computer via Firewire and navigate to the same settings tab at Control panel. There are hosted mode options at the top of UI.. there you have to select ADAT mode for optical port B. And sync source as internal (expansion unit will be following that via ADAT connections).

That's it.. analog inputs from expansion unit should be accessible as an ADAT channels and you should see them on Control panel screen with meters.
To access its analog outputs from DAW, you'll need to navigate to routing tab there, where you'd select appropriate SW return channels as a sources for ADAT outputs.

There is also option to aggregate two Firewire interfaces at OS X level, but this ADAT standalone solution is better and more reliable IMO/IME. If you set that right, all audio streaming will be handled by the single primary unit, you can use one common monitoring mix and there won't be any syncing issues.

Pretty sure you can't run Optical B as ADAT in standalone mode, except under SMUX conditions.