Jrsub - from my understanding, DAC-2 DSDse and DAC-2v2SE only support DSD256 via native mode even on Windows. I do not believe you can send DSD256 natively to unless the DAC support DSD512 such as the iFi micro iDSD. See the following:
http://www.computeraudiophile.com/f1...ack-mac-26375/