X-FireWire Compatibility with Mac OSX
Apogee Legacy Products (AD16x, DA16x, Rosetta 800, Rosetta 200) with X-FireWire option cards will work with Mac OSX, without any Apogee software installed.
This is because it uses a native Firewire Audio driver that Apple built into OSX.
That being said, please note that FireMix/Maestro support for X-FireWire is NOT available with Mac OSX Lion 10.7 or higher.